Search

CN-116085759-B - Afterburning type flue gas molten salt heat exchange device and working mechanism thereof

CN116085759BCN 116085759 BCN116085759 BCN 116085759BCN-116085759-B

Abstract

A post-combustion type flue gas molten salt heat exchange device and a working mechanism thereof are characterized in that a post-combustion device is added at the upstream of a flue gas molten salt heat exchanger, and the post-combustion device is connected with the flue gas molten salt heat exchanger through a flue to form a post-combustion type flue gas molten salt heat exchange integrated device, and the post-combustion type flue gas molten salt heat exchange device comprises a post-combustion device system or a post-combustion device and a primary flue gas molten salt heat exchange component. The invention can realize the functions of more uniform and more efficient afterburning and heat transfer in the flue gas, realize a safer ignition mode of the afterburning gas or atomized afterburning gas-liquid (or gas-powder) mixture outside the flue, realize the function of more conveniently monitoring the afterburning condition, realize complete decoupling of thermoelectric in the power generation and heat supply energy storage system of the gas turbine and realize the functions of autonomous external power supply, heat storage or heat supply of the system.

Inventors

  • HUANG QINGHUA

Assignees

  • 北京工大环能科技有限公司

Dates

Publication Date
20260508
Application Date
20221106

Claims (8)

  1. 1. The post-combustion type flue gas molten salt heat exchange device is characterized by comprising at least 1 post-combustion device (72-2), wherein the post-combustion device (72-2) is used for post-combustion of tail gas generated after power generation of a combustion engine; the section of the high-temperature tail gas discharge flue of the gas turbine is provided with a first smoke pressure line (72-1-1) to a mth smoke pressure line (72-1-m), the pressure of the smoke on the same pressure line is the same, and the positions of the first smoke pressure line (72-1-1) to the mth smoke pressure line (72-1-m) are obtained through numerical simulation calculation; The post-combustion device (72-2) comprises at least 1 first post-combustion nozzle (72-2-1-1), a first post-combustion branch pipe loop (72-2-1-2), a first post-combustion mixing pipe (72-2-1-3), a first post-combustion ignition chamber (72-2-1-4), a first post-combustion ignition observation window (72-2-1-5), a first post-combustion air pipe (72-2-1-6), a first post-combustion air electric valve (72-2-1-7), a first post-combustion electric igniter (72-2-1-8), a first post-combustion gas pipe (72-2-1-9) a first post-combustion gas electric valve (72-2-1-10), at least 1m post-combustion nozzle (72-2-m-1), an m post-combustion branch pipe loop (72-2-m-2), an m post-combustion mixing pipe (72-2-m-3), an m post-combustion ignition chamber (72-2-m-4), an m post-combustion ignition observation window (72-2-m-5), an m post-combustion air pipe (72-2-m-6), an m post-combustion air electric valve (72-2-m-7), an m post-combustion electric igniter (72-2-m-8), the secondary combustion device (72-2) is provided with m secondary combustion branch circuits, secondary combustion mixing pipes, secondary combustion ignition chambers, secondary combustion air pipes, secondary combustion air electric valves, secondary combustion electric igniters, secondary combustion air pipes and secondary combustion gas electric valves, wherein the secondary combustion device (72-2) is provided with m secondary combustion branch circuits, secondary combustion mixing pipes, secondary combustion ignition chambers, secondary combustion air pipes, secondary combustion air electric valves, secondary combustion electric igniters, secondary combustion air pipes and secondary combustion gas electric valves; the axis of the first afterburning branch pipe loop (72-2-1-2) coincides with the first smoke pressure line (72-1-1), and the first afterburning branch pipe loop (72-2-1-2) is a communicated loop; The axis of the first afterburner nozzle (72-2-1-1) is along the flow direction of the flue gas and is perpendicular to the axis of the first afterburner branch pipe loop (72-2-1-2), and the first afterburner nozzle (72-2-1-1) is in through connection with the first afterburner branch pipe loop (72-2-1-2), and a plurality of first afterburner nozzles (72-2-1-1) are uniformly arranged along the axis of the first afterburner branch pipe loop (72-2-1-2); the axis of the first afterburning mixing pipe (72-2-1-3) is connected with the axis of the first afterburning branch pipe loop (72-2-1-2), and the first afterburning mixing pipe (72-2-1-3) is in through connection with the first afterburning branch pipe loop (72-2-1-2); The symmetry line of the first afterburning ignition chamber (72-2-1-4) is connected with the axis of the first afterburning mixing pipe (72-2-1-3) in the same direction, and the first afterburning ignition chamber (72-2-1-4) is connected with the first afterburning mixing pipe (72-2-1-3) in a penetrating way; The first after-burning ignition observation window (72-2-1-5) is arranged on the first after-burning ignition chamber (72-2-1-4) in a manner and in an amount which is convenient for observing the ignition condition in the first after-burning ignition chamber (72-2-1-4) to determine; the axis of the first after-combustion air pipe (72-2-1-6) is in cross oblique connection with the symmetry line of the first after-combustion ignition chamber (72-2-1-4), the first after-combustion air pipe (72-2-1-6) is in oblique through connection with the first after-combustion ignition chamber (72-2-1-4), and a first after-combustion air electric valve (72-2-1-7) is arranged on the first after-combustion air pipe (72-2-1-6) to control the air flow; the axis of the first afterburning gas pipe (72-2-1-9) is connected with the symmetry line of the first afterburning ignition chamber (72-2-1-4) in the same direction, and the first afterburning gas pipe (72-2-1-9) is inserted into the first afterburning ignition chamber (72-2-1-4) for a certain length and then is communicated with the first afterburning ignition chamber, wherein the first afterburning gas pipe (72-2-1-9) is provided with a first afterburning gas electric valve (72-2-1-10) for controlling the flow of fuel gas; one end of the first afterburner (72-2-1-8) is connected with the pipe wall of the first afterburner gas pipe (72-2-1-9) through a wire, at least 1 ignition probe is arranged at the other end of the first afterburner gas pipe, one end of the ignition probe is connected with the first afterburner gas pipe (72-2-1-8) through a wire, the other end of the ignition probe is not contacted with a pipe orifice of the first afterburner gas pipe (72-2-1-9) inserted into the first afterburner ignition chamber (72-2-1-4) for a certain length, and electric sparks are generated after the distance is suitable for being electrified, wherein a low-voltage power supply is arranged in the first afterburner gas pipe (72-2-1-8); The axis of the mth afterburning branch pipe loop (72-2-m-2) coincides with the mth pressure line (72-1-m) of the flue gas, and the mth afterburning branch pipe loop (72-2-m-2) is a communicated loop; The axis of the m-th afterburner nozzle (72-2-m-1) is along the flow direction of the flue gas and is perpendicular to the axis of the m-th afterburner branch pipe loop (72-2-m-2), and the m-th afterburner nozzle (72-2-m-1) is in through connection with the m-th afterburner branch pipe loop (72-2-m-2), and a plurality of m-th afterburner nozzles (72-2-m-1) are uniformly arranged along the axis of the m-th afterburner branch pipe loop (72-2-m-2); The axis of the m-th afterburning mixing pipe (72-2-m-3) is connected with the axis of the m-th afterburning branch pipe loop (72-2-m-2), and the m-th afterburning mixing pipe (72-2-m-3) is in through connection with the m-th afterburning branch pipe loop (72-2-m-2); the symmetry line of the m-th afterburning ignition chamber (72-2-m-4) is connected with the axis of the m-th afterburning mixing pipe (72-2-m-3) in the same direction, and the m-th afterburning ignition chamber (72-2-m-4) is connected with the m-th afterburning mixing pipe (72-2-m-3) in a penetrating way; the m-th post-combustion ignition observation window (72-2-m-5) is arranged on the m-th post-combustion ignition chamber (72-2-m-4) in a manner and in an amount which is convenient for observing the ignition condition in the m-th post-combustion ignition chamber (72-2-m-4) to determine; The axial line of the m-th after-combustion air pipe (72-2-m-6) is in crossed and oblique connection with the symmetry line of the m-th after-combustion ignition chamber (72-2-m-4), the m-th after-combustion air pipe (72-2-m-6) is in oblique through connection with the m-th after-combustion ignition chamber (72-2-m-4), and the m-th after-combustion air pipe (72-2-m-6) is provided with an m-th after-combustion air electric valve (72-2-m-7) for controlling the air flow; The axis of the m-th afterburning gas pipe (72-2-m-9) is connected with the symmetry line of the m-th afterburning ignition chamber (72-2-m-4) in the same direction, the m-th afterburning gas pipe (72-2-m-9) is inserted into the m-th afterburning ignition chamber (72-2-m-4) for a certain length and then is communicated with the m-th afterburning ignition chamber, and the m-th afterburning gas pipe (72-2-m-9) is provided with an m-th afterburning gas electric valve (72-2-m-10) for controlling the flow of gas; One end of the m-th afterburner (72-2-m-8) is connected with the pipe wall of the m-th afterburner gas pipe (72-2-m-9) through a wire, at least 1 ignition probe is arranged at the other end of the m-th afterburner, one end of the ignition probe is connected with the m-th afterburner (72-2-m-8) through a wire, the other end of the ignition probe is not contacted with a pipe orifice of the m-th afterburner gas pipe (72-2-m-9) inserted into the m-th afterburner chamber (72-2-m-4) for a certain length, and the distance is suitable for generating electric sparks after being electrified, and a low-voltage power supply is arranged in the m-th afterburner (72-2-m-8).
  2. 2. The afterburning type flue gas molten salt heat exchange device is characterized by comprising an afterburner system (72), wherein the flue gas is tail gas generated after power generation of a fuel engine; The afterburner system (72) comprises at least 1 afterburner device (72-2), at least 1 afterburner ignition video monitor (72-7), at least 1 afterburner nozzle combustion observation window (72-3), at least 1 afterburner nozzle combustion observation video monitor (72-6), a pre-afterburner flue gas temperature and pressure measuring instrument (72-4) and a post-afterburner flue gas temperature and pressure measuring instrument (72-5); Along the direction of the flue gas, at least 1 hole is formed in the wall of the flue at the downstream of the afterburner device (72-2), and 1 afterburner nozzle combustion observation window (72-3) is embedded in each hole, wherein the afterburner nozzle combustion observation video monitors (72-6) are arranged at a certain position outside the flue, and the arranged positions and the number of the afterburner nozzle combustion observation video monitors can be determined by observing the combustion conditions of all the afterburner nozzles; A post-combustion pre-flue gas temperature and pressure measuring instrument (72-4) is arranged at the upstream of the post-combustion device (72-2), and a probe of the post-combustion pre-flue gas temperature and pressure measuring instrument is inserted into the flue through the flue wall along the radial direction of the flue; The post-combustion flue gas temperature and pressure measuring instrument (72-5) is arranged at the downstream of the post-combustion device (72-2), and the probe of the post-combustion flue gas temperature and pressure measuring instrument is inserted into the flue through the wall of the flue along the radial direction of the flue, so that the combustion condition of the post-combustion nozzle is confirmed without being influenced when the post-combustion flue gas temperature and pressure measuring instrument (72-5) is arranged at the upstream of the combustion observation window (72-3) of the post-combustion nozzle; the post-combustion ignition video monitor (72-7) is arranged at a certain position outside the flue, and the arranged position and the number of the post-combustion ignition video monitor are determined by observing the internal ignition condition of the post-combustion ignition chamber in all the post-combustion devices; The post-combustion nozzle, the post-combustion branch pipe loop and part of the post-combustion mixing pipe in the post-combustion device (72-2) are arranged in the flue, the post-combustion nozzle is distributed on the post-combustion branch pipe loop, the post-combustion branch pipe loop is connected with part of the post-combustion mixing pipe and the inner wall of the flue through the supporting structure, and the post-combustion mixing pipe in the post-combustion device penetrates through the wall of the flue along the radial direction of the flue.
  3. 3. The post-combustion type flue gas molten salt heat exchange device according to claim 1 or 2 is characterized by comprising a post-combustion type flue gas molten salt heat exchange device, wherein the post-combustion type flue gas molten salt heat exchange device comprises a post-combustion device system (72) or a post-combustion device (72-2), a primary flue gas molten salt heat exchange component (73-1); the afterburner system (72) or the afterburner device (72-2) is connected with the primary flue gas fused salt heat exchange assembly (73-1) through a flue gas pipeline (60).
  4. 4. A post-combustion type flue gas molten salt heat exchange device according to claim 1 or 2, wherein the inner contour line (72-1-0) of the flue section is a round, square or multi-section closed fold line.
  5. 5. The afterburning type flue gas molten salt heat exchange device according to claim 1 or 2, characterized in that: The fuel gas in the m-th afterburning gas pipe (72-2-m-9) is combustible gas, atomized combustible gas-liquid mixture, atomized combustible gas powder mixture or atomized combustible gas-liquid powder mixture.
  6. 6. An afterburning type flue gas molten salt heat exchange device according to claim 1 or 2, characterized in that the internal section contour lines of all the afterburning nozzles in the afterburning device (72-2) are hyperbolic; the section of the high-temperature tail gas discharge flue of the gas turbine is provided with a first smoke pressure line (72-1-1) to a mth smoke pressure line (72-1-m), the pressure of the smoke on the same pressure line is the same, and the positions of the first smoke pressure line (72-1-1) to the mth smoke pressure line (72-1-m) are obtained through numerical simulation calculation; The axis of a first afterburning branch pipe loop (72-2-1-2) of the afterburning device (72-2) coincides with a first pressure line (72-1-1) of the flue gas, the first afterburning branch pipe loop (72-2-1-2) is a communicated loop, the axis of an mth afterburning branch pipe loop (72-2-m-2) of the afterburning device (72-2) coincides with an mth pressure line (72-1-m) of the flue gas, and the mth afterburning branch pipe loop (72-2-m-2) is a communicated loop; The plurality of first afterburned nozzles (72-2-1-1) are uniformly arranged along an axis of the first afterburned manifold circuit (72-2-1-2) and/or the plurality of m-th afterburned nozzles (72-2-m-1) are uniformly arranged along an axis of the m-th afterburned manifold circuit (72-2-m-2).
  7. 7. The working method of the afterburning type flue gas molten salt heat exchange device is characterized by comprising the following steps of: The afterburning type flue gas molten salt heat exchange device comprises an afterburner system (72); the normal operation of the afterburner system (72) is as follows: The flue gas firstly passes through a flue gas temperature and pressure measuring instrument (72-4) before afterburning at the upstream of an afterburning device (72-2) to measure the temperature and pressure values of the flue gas before afterburning, and the temperature and pressure values of the flue gas before afterburning are transmitted into an intelligent afterburning control system for standby through a transmitter; When the flue gas passes through the afterburner (72-2), the flue gas is heated by the afterburner (72-2) and then continuously flows to the downstream, a video monitor (72-6) for observing the combustion of the afterburner nozzle records the combustion conditions of all nozzles in the afterburner (72-2) through a combustion observation window (72-3) of the afterburner nozzle, video signals are transmitted into an afterburner intelligent control system through a video signal wire, and the results after being analyzed and processed by an AI technology are stored for standby; The post-combustion flue gas temperature and pressure values are measured through a post-combustion flue gas temperature and pressure measuring instrument (72-5) after post-combustion of the post-combustion device (72-2), and are transmitted into an post-combustion intelligent control system through a transmitter for standby; The method comprises the steps of forming a relation among a spare post-combustion flue gas temperature and pressure value of an incoming post-combustion intelligent control system, a post-combustion flue gas temperature and pressure value, an post-combustion nozzle combustion observation video monitor (72-6) stored in the incoming post-combustion intelligent control system, a result of AI technical analysis processing on combustion conditions of all nozzles in the post-combustion device (72-2), an AI technical analysis processing result of the post-combustion lighting video monitor (72-7) stored in the incoming post-combustion intelligent control system, a result of AI technical analysis processing on ignition conditions of all post-combustion lighting chambers in the post-combustion device (72-2), a first post-combustion air electric valve (72-2-1-7) of the post-combustion device (72-2), a first post-combustion electric igniter (72-2-1-8), a first post-combustion gas electric valve (72-2-1-10), an mth post-combustion air electric valve (72-2-m-7), an mth post-combustion electric igniter (72-2-m-8) and an mth post-combustion gas electric valve (72-2-m-10), and executing a logic control system by an intelligent control system.
  8. 8. The working method of the afterburning type flue gas molten salt heat exchange device is characterized by comprising the following steps of: the post-combustion type flue gas molten salt heat exchange device comprises a post-combustion device (72-2) for post-combustion of flue gas; When the smoke needs to be post-combusted, the process from ignition to normal operation of the post-combustion device (72-2) is as follows: When the smoke needs to be post-combusted, an algorithm in the intelligent post-combustion control system sends out an instruction for opening a first post-combustion air electric valve (72-2-1-7) and/or an mth post-combustion air electric valve (72-2-m-7), and after 1-2 seconds; an algorithm in the afterburning intelligent control system sends out a command that a first afterburning electric igniter (72-2-1-8) and a first afterburning gas electric valve (72-2-1-10) are opened simultaneously, and/or an mth afterburning electric igniter (72-2-m-8) and an mth afterburning gas electric valve (72-2-m-10) are opened simultaneously; At this time, the first afterburning ignition observation window (72-2-1-5) and/or the mth afterburning ignition observation window (72-2-m-5) of the afterburning device (72-2) can observe that the mixed gas in the first afterburning ignition chamber (72-2-1-4) and/or the mth afterburning ignition chamber (72-2-m-4) is ignited, the ignition video information is recorded by an afterburning ignition video monitor (72-7) and then is transmitted to an afterburning intelligent control system for storage, the result of analysis and processing of the video information of the ignition conditions of all the afterburning ignition chambers in the afterburning device (72-2) is a value representing ignition, and after the value is received, an algorithm in the afterburning intelligent control system sends an instruction for closing the first afterburning electric igniter (72-2-1-8) and/or the mth afterburning electric igniter (72-2-m-8); Meanwhile, an algorithm in the intelligent afterburning control system sends out a command for increasing the opening degree, namely the flow rate, of the first afterburning air electric valve (72-2-1-7) and the first afterburning gas electric valve (72-2-1-10) and/or the opening degree, namely the flow rate, of the mth afterburning air electric valve (72-2-m-7) and the mth afterburning gas electric valve (72-2-m-10); The flow rate of the mixed gas in the first afterburning ignition chamber (72-2-1-4) and/or the m-th afterburning ignition chamber (72-2-m-4) of the afterburning device (72-2) is gradually increased, the flow rate of air and fuel gas in the mixed gas is controlled through an algorithm, so that flame flows forwards along with the flow of the mixed gas, the flame sequentially passes through the first afterburning mixing pipe (72-2-1-3) and the first afterburning branch pipe loop (72-2-1-2) along with the flow of the mixed gas, and is sprayed out of all the first afterburning nozzles (72-2-1-1) and/or sequentially passes through the m-th afterburning mixing pipe (72-2-m-3) and the m-th afterburning branch pipe loop (72-2-m-2) and is sprayed out of all the m-th afterburning nozzles (72-2-m-1); At this time, the combustion condition of all the post-combustion nozzle mixture in the post-combustion nozzle combustion observation window (72-3) can be observed, the combustion condition video information is recorded by the post-combustion nozzle combustion observation video monitor (72-6) and then is transmitted to the post-combustion intelligent control system for storage, the combustion condition video information of all the post-combustion nozzle mixture in the post-combustion device (72-2) is analyzed and processed by AI technology to be a value representing that the post-combustion nozzle is ignited, after the value is received, an algorithm in the post-combustion intelligent control system sends out an instruction for keeping the current opening degree of the first post-combustion air electric valve (72-2-1-7) and the first post-combustion gas electric valve (72-2-1-10) and/or the mth post-combustion air electric valve (72-2-m-7) and the mth post-combustion gas electric valve (72-2-m-10); And the result of analysis and treatment of the temperature and pressure values of the flue gas before afterburning and the flue gas after afterburning, which are fed into the afterburning intelligent control system for standby, is used as a reference for judging whether the afterburning system is in normal operation.

Description

Afterburning type flue gas molten salt heat exchange device and working mechanism thereof Technical Field The invention belongs to the technical field of molten salt equipment, and particularly relates to a post-combustion type flue gas molten salt heat exchange device and a working mechanism thereof. Background After some coal motor sets are shut down, one part of the functions of the coal motor sets are replaced by a gas heating boiler, and the other part of the functions of the coal motor sets are replaced by a gas power generation heating system. The basic functions of the gas boiler are optimized and improved, so that a mature process technical scheme of a power generation and heat supply system of the gas engine and the waste heat boiler, a heat storage, power generation and heat supply system of the gas engine and the like is formed. Patent CN 213021144U discloses a fused salt flue gas heat exchanger, which comprises a shell, a lower end enclosure, an upper end enclosure, a heat exchange tube, a lower tube plate and an upper tube plate. The technical scheme can realize the heat exchange of intermittent high-temperature flue gas and molten salt, but can not realize the functions of afterburning and flue gas purification of the heat exchanger. Patent CN 206973508U discloses a molten salt heat storage system for waste heat of a gas turbine, which comprises a molten salt waste heat boiler, a low-temperature molten salt tank, a high-temperature molten salt tank and a steam generation unit. The technical scheme has the functions of heat accumulation and energy storage, but the thermoelectric power of the technical scheme has a coupling relation, namely the total heat quantity and the total power generation quantity are limited in a correlated way, namely the heat stored by the technical scheme cannot exceed the waste heat quantity of the gas turbine smoke, and the independent external heat supply or power supply cannot be realized. The invention aims at the technical problems in the technical scheme, and the realized technical scheme not only can realize the reutilization of the waste heat of the flue gas after the power generation of the gas turbine, but also can realize the complete decoupling of the thermoelectric in the power generation, heat supply and energy storage system of the gas turbine, and realize the flue gas purification of the system and the autonomous external power supply, heat storage or heat supply. Disclosure of Invention The invention aims to realize the recycling of the waste heat of the flue gas after the power generation of the gas turbine and the complete decoupling of the thermoelectric in the power generation, heat supply and energy storage system of the gas turbine, and realize the functions of autonomous external power supply, heat storage or heat supply of the system. The technical scheme of the invention is as follows: A post-combustion type flue gas molten salt heat exchange device is characterized in that a post-combustion device is added at the upstream of a flue gas molten salt heat exchanger, and the post-combustion device is connected with the flue gas molten salt heat exchanger through a flue to form a post-combustion type flue gas molten salt heat exchange integrated device. Further, a afterburning formula flue gas fused salt heat transfer device, its characterized in that: comprises at least 1 post-combustion device (72-2), wherein the post-combustion device (72-2) comprises at least 1 first post-combustion nozzle (72-2-1-1), a first post-combustion branch pipe loop (72-2-1-2), a first post-combustion mixing pipe (72-2-1-3), a first post-combustion ignition chamber (72-2-1-4), a first post-combustion ignition observation window (72-2-1-5), a first post-combustion air pipe (72-2-1-6), a first post-combustion air electric valve (72-2-1-7), a first post-combustion electric igniter (72-2-1-8), a first post-combustion air pipe (72-2-1-9), a first post-combustion electric valve (72-2-1-10), at least 1 mth post-combustion nozzle (72-2-m-1), a mth post-combustion branch pipe loop (72-2-m-2), a mth post-combustion mixing pipe (72-2-m-3), a mth post-combustion chamber (72-2-m-2), a mth post-combustion mixing pipe (72-2-m-3), a mth post-combustion chamber (72-2-m-3), a first post-combustion observation window (72-2-m-1-m) and a first post-combustion air pipe (72-2-1-m-3) The secondary combustion device comprises an mth secondary combustion air electric valve (72-2-m-7), an mth secondary combustion electric igniter (72-2-m-8), an mth secondary combustion gas pipe (72-2-m-9) and an mth secondary combustion gas electric valve (72-2-m-10), wherein the secondary combustion device (72-2) is provided with m secondary combustion branch circuits, secondary combustion mixing pipes, secondary combustion ignition chambers, secondary combustion air pipes, secondary combustion air electric valves, secondary combustion electric igniters, secondary combustion gas pipes and secondary combustio