CN-115786009-B - Reactant organization apparatus and method

CN115786009BCN 115786009 BCN115786009 BCN 115786009BCN-115786009-B

Abstract

The invention provides a reactant organization device and a method, wherein the device comprises the following components: a fuel organization unit and a first oxidant organization unit. The fuel organization unit comprises a main body section and a fuel channel penetrating through the main body section, wherein an inlet of the fuel channel is communicated with an outlet of the thermal modification furnace, an outlet of the fuel channel is communicated with an inlet of the gasification melting furnace, and an outlet end of the main body section is directly connected with the inlet of the gasification melting furnace; the first oxidant organization unit comprises at least one first oxidant spray pipe, the at least one first oxidant spray pipe is buried in the main body section, and an outlet of the first oxidant spray pipe is communicated with the fuel channel.

Inventors

LI WEI
REN QIANGQIANG
LIANG CHEN
LI BAIHANG

Assignees

中国科学院工程热物理研究所

Dates

Publication Date: 20260508
Application Date: 20220907

Claims (11)

1. A reactant organizing device, comprising: The fuel organization unit comprises a main body section and a fuel channel penetrating through the main body section, wherein an inlet of the fuel channel is communicated with an outlet of the thermal modification furnace, an outlet of the fuel channel is communicated with an inlet of the gasification melting furnace, and an outlet end of the main body section is directly connected with the inlet of the gasification melting furnace; A first oxidant organizing unit comprising at least one first oxidant lance embedded within the main body section, with an outlet of the first oxidant lance in communication with the fuel passage; The second oxidant organization unit comprises at least one second oxidant spray pipe, the second oxidant spray pipe is arranged in the fuel channel, and the central axis of the second oxidant spray pipe is parallel to the central axis of the fuel channel; The at least one first oxidant spray pipe is divided into a plurality of partition spray pipe groups, the distances between the outlet ends of the first oxidant spray pipes and the central axis of the fuel channel are the same in the same partition spray pipe group, and the distances between the outlet ends of the first oxidant spray pipes and the central axis of the fuel channel are different in different partition spray pipe groups.
2. The apparatus of claim 1, wherein: And an abrasion-resistant layer is arranged on the outer surface of the second oxidant spray pipe.
3. The apparatus of claim 1, wherein: The at least one first oxidant spray pipe is uniformly distributed and arranged along the circumferential direction of the fuel channel.
4. A device according to claim 3, wherein: the value range of the horizontal included angle alpha between the central axis of the first oxidant spray pipe and a preset cross section is 25-75 degrees, wherein the preset cross section is perpendicular to the central axis of the fuel channel.
5. A device according to claim 3, wherein: the central axis of the first oxidant lance intersects the central axis of the fuel passage; The at least one first oxidant spray pipe is divided into a first opposite flushing spray pipe group and a second opposite flushing spray pipe group, wherein the central axes of the first oxidant spray pipe are coincident in the first opposite flushing spray pipe group and the second opposite flushing spray pipe group.
6. A device according to claim 3, wherein: the central axis of the first oxidant lance is non-intersecting with the central axis of the fuel channel; the value range of the included angle beta between the central axis of the first oxidant spray pipe and a preset longitudinal section is 40-75 degrees, wherein the preset longitudinal section passes through the central axis of the fuel channel and the outlet end point of the first oxidant spray pipe at the same time.
7. The apparatus of claim 1, wherein: the main body section is made of one of silicon carbide, corundum brick and zirconia.
8. The apparatus of claim 1, wherein: and a water cooling sleeve is arranged outside the first oxidant spray pipe.
9. A method of reactant organization comprising: Feeding a gas-solid composite fuel and a first oxidant into a gasification melting furnace by utilizing a fuel organization unit and a first oxidant organization unit so that the gas-solid composite fuel and the first oxidant perform a preset gasification reaction in the gasification melting furnace, wherein the gas-solid composite fuel is a product obtained after the original fuel is thermally modified in a thermal modification furnace; The first oxidant organization unit is used for feeding the gas-solid composite fuel into the gasification melting furnace, the fuel organization unit comprises a main body section and a fuel channel penetrating through the main body section, an inlet of the fuel channel is communicated with an outlet of the thermal modification furnace, an outlet of the fuel channel is communicated with an inlet of the gasification melting furnace, and an outlet end of the main body section is directly connected with the inlet of the gasification melting furnace; The first oxidant organization unit is used for feeding the first oxidant into the gasification melting furnace, the first oxidant organization unit comprises at least one first oxidant spray pipe, the at least one first oxidant spray pipe is buried in the main body section, and an outlet of the first oxidant spray pipe is communicated with the fuel channel; Feeding a second oxidant into the gasification melting furnace by using a second oxidant organization unit, wherein the second oxidant organization unit comprises at least one second oxidant spray pipe, the second oxidant spray pipe is arranged in the fuel channel, and the central axis of the second oxidant spray pipe is parallel to the central axis of the fuel channel; The method comprises the steps of dividing at least one first oxidant spray pipe into a plurality of partition spray pipe groups, wherein the distances between the outlet end of the first oxidant spray pipe and the central axis of a fuel channel are the same in the same partition spray pipe group, the distances between the outlet end of the first oxidant spray pipe and the central axis of the fuel channel are different in different partition spray pipe groups, and feeding the first oxidant into the gasification melting furnace by using the first oxidant organization unit comprises the step of feeding the first oxidant into different positions in the gasification melting furnace by using the partition spray pipe groups respectively so as to form a plurality of different combustion partitions in the gasification melting furnace.
10. The method of claim 9, wherein a central axis of the first oxidant lance intersects a central axis of the fuel channel, the at least one first oxidant lance being divided into a first set of opposite-flushing pipes and a second set of opposite-flushing pipes, wherein the central axes of the first oxidant lances coincide; feeding the first oxidant into the gasification melting furnace with the first oxidant organization unit includes: And feeding the first oxidant into the gasification melting furnace in the form of a hedging jet by using the first hedging jet pipe group and the second hedging jet pipe group.
11. The method of claim 9, wherein the central axis of the first oxidant lance does not intersect the central axis of the fuel channel, the angle β between the central axis of the first oxidant lance and a predetermined longitudinal plane passing through both the central axis of the fuel channel and the outlet end point of the first oxidant lance having a value in the range of 40 ° -75 °; feeding the first oxidant into the gasification melting furnace with the first oxidant organization unit includes: and feeding the first oxidant into the gasification melting furnace in a swirl injection mode by using the first oxidant spray pipe.

Description

Reactant organization apparatus and method Technical Field The invention belongs to the technical field of high-temperature melting combustion and gasification, and particularly relates to a reactant organization device and a method. Background The organization of the fuel is the key to the combustion and gasification reactions, and the existing burner is a typical fuel reaction organization device. Taking a gasification furnace as an example, the burner of the entrained flow gasification furnace is an integral device with a compact structure, is mainly of a multi-channel structure and is generally divided into a central oxygen agent channel, a fuel channel and an outer ring oxygen channel. The reaction temperature in the entrained-flow gasifier is higher (1300 ℃) and reaches above the melting point of coal ash, and a high-temperature reaction zone in the entrained-flow gasifier occurs near the head of the burner and runs for a long time, so that the head of the burner is easy to ablate and damage. In gasification production, if burning nozzle ablation occurs, the burning nozzle must be shut down for maintenance and replaced, so that normal production is affected, and economic loss is caused. In addition, the oxidant is generally arranged in a coaxial jet flow and a cross jet flow, which easily causes poor tissue effect in the gasification process. At present, because of the requirements of entrained flow gasification reaction on tissue strength, the limitation of entrained flow gasification furnace operation under the condition of pressurization and the like, research and innovation of gasification burner cannot be carried out, the design thought of a multichannel structure can not be skipped, and the time of ablation can be prolonged as much as possible only through material improvement. Therefore, a stable and reliable fuel organization structure is provided, which is very urgent. Disclosure of Invention In view of the above, the present invention provides a reactant organization device and method for at least partially solving the above-mentioned technical problems. Coal is an important energy source in China, and mainly has two utilization modes of combustion and gasification. Most of the prior strengthening of gasification reaction is to promote the balance of gasification reaction to move towards the direction of the product by high temperature and high pressure, but the mode limits the design of the gasification furnace, and simultaneously limits the structure of a gasification organization device (burner) to a multi-channel design. In the long-time gasification operation process of the burner with the multichannel structure, the head of the burner is easy to burn and damage, and normal production is influenced. Different from the technical thought, the fluidized melting combustion/gasification process combines high-temperature modification and gasification/combustion of coal to realize cascade control of the coal gasification/combustion reaction process, improve the gasification/combustion reaction intensity and realize high-efficiency low-carbon utilization of coal. Meanwhile, the high-temperature thermal modification process has the effect of activating and modifying the fuel, so that the combustion/gasification reaction of ultralow volatile fuel such as gasified fine ash, coal gangue and the like can be promoted, and the utilization efficiency of coal is improved. However, in the fluidized-melting combustion/gasification process, the high-temperature gas-solid composite fuel (including semicoke and coal gas) generated by the thermal modification unit needs to enter the melting combustion/gasification unit together through a burner and an oxidant, and the high temperature of the thermal fuel is utilized to generate a high-temperature area at the moment of contacting with the gasifying agent so as to strengthen the progress of the reaction. Moreover, for the fluidized melt combustion/gasification process, the temperature of the high temperature gas-solid composite fuel is about 900 ℃, and in order to ensure the fuel velocity to be about 20 m/s, the diameter of the burner fuel channel is usually 3-5 times larger than that of a conventional normal temperature fuel burner. Thus, the momentum of the outer ring oxygen cannot complete penetration of the hot fuel, resulting in poor reaction tissue results. There is no feasible technical solution for a reaction organization device of a large volume of hot fuel, so that innovation for organization of oxygen and fuel is also required. In accordance with this, in one aspect, the present invention provides a reactant tissue device comprising a combustion tissue element and a first oxidant tissue element. The fuel organization unit comprises a main body section and a fuel channel penetrating through the main body section, wherein the inlet of the fuel channel is communicated with the outlet of the thermal modification furnace, the outlet of the fuel channel is