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CN-121975547-A - High-temperature flue gas circulation heating oil-rich heating furnace device and heating method thereof

CN121975547ACN 121975547 ACN121975547 ACN 121975547ACN-121975547-A

Abstract

The rich oil heating furnace device for circularly heating high-temperature flue gas comprises a heating furnace body, a heating burner, a combustion air pipeline, a furnace top flue gas pipe, an air preheater, a flue gas discharge chimney and a rich oil conveying pipe arranged in a furnace chamber, and is characterized in that the center of the furnace body is provided with a high-temperature flue gas injection guide cylinder and a rich oil conveying pipe surrounding the outer ring of the high-temperature flue gas injection guide cylinder; the heating burner is arranged on the inner chamber wall of the lower part of the heating furnace body, the bottom of the hearth is provided with an inner smoke circulation channel formed by an outer circulation hot air pipeline of the furnace and a furnace top smoke pipe of the upper part of the heating furnace body, and an outer preheating air conveying channel which can be preheated by the smoke discharge chimney is formed by an air pipeline, a hot air pipeline, a smoke discharge chimney and the inner burner of the air preheater, thereby forming a closed inner and outer circulation heating system which can continuously heat the rich oil flowing through the inner rich oil tray conveying pipe of the furnace.

Inventors

  • CHANG HENGSHUAN
  • XIANG SHUNHUA
  • LUO QILI

Assignees

  • 南通炉艺高科技研发有限公司

Dates

Publication Date
20260505
Application Date
20260316

Claims (15)

  1. 1. The high-temperature flue gas circulating heating rich oil heating furnace device comprises a heating furnace body (4), a heating burner (31), a combustion air pipeline (2) which is respectively connected with a combustion fan (1) and an air preheater (13) through two ends, a furnace top flue gas pipe (18) which is sequentially connected with the upper part of the heating furnace body (4) from bottom to top, the air preheater (13) and a flue gas discharge chimney (14), a hot air pipeline (19) which is communicated with the air preheater (13) and a circulating high-temperature flue gas inlet at the lower part of the heating furnace body (4), a flue gas discharge chimney (14) which is provided with a flue gas discharge regulating valve (15), and a rich oil conveying pipe which is arranged in an inner cavity of the heating furnace body (4), wherein a high-temperature flue gas injection guide cylinder (23) is arranged in the central position of the heating furnace body (4), a rich oil conveying pipe which surrounds the outer ring of the high-temperature flue gas injection guide cylinder and is distributed in a ring shape or in a vertical shape is arranged in a cavity between the high-temperature flue gas injection guide cylinder (23) and the inner wall of the heating furnace body (4), the heating burner (31) is arranged at the lower part of the heating furnace body (4) and is communicated with a high-temperature flue gas circulating inlet (35) at the bottom of a high-temperature flue gas circulating fan (35) which is arranged at the lower part of the heating furnace body (4), the high-temperature flue gas circulating fan (38) is communicated with the inner cavity of a furnace top flue gas pipe (18) arranged at the upper part of the heating furnace body (4) through an external furnace circulating hot air pipeline (3) connected with the inlet of the high-temperature flue gas circulating fan, thus forming an internal furnace flue gas circulating channel, and the internal and external furnace circulating heating system capable of continuously heating the rich oil flowing through the internal furnace rich oil pipe is formed by an air preheater (13) arranged at the upper part of the furnace top flue gas pipe (18), air pipelines (2) arranged at the left side and the right side of the air preheater (13), a hot air pipeline (19), a flue gas discharge flue gas punch (14) arranged at the upper part of the air preheater (13) and an internal furnace heating burner (31) connected with the hot air pipeline (19).
  2. 2. The oil-rich heating furnace device for circularly heating high-temperature flue gas according to claim 1, wherein the high-temperature flue gas injection guide cylinder (23) is a cylindrical member provided with a sealing head, a plurality of high-temperature flue gas injection holes (45) are formed in the cylinder body, and the lower part of the cylinder body of the high-temperature flue gas injection guide cylinder (23) is arranged in a high-temperature flue gas mixing hearth (35) at the bottom of the heating furnace body (4) through a guide cylinder flange (46) for installation.
  3. 3. The high-temperature flue gas circulating heating oil-rich heating furnace device according to claim 1 is characterized in that the high-temperature flue gas mixing hearth (35) is a cylindrical body and is arranged in the bottom of an inner cavity of the heating furnace body (4), and the burner (31) is arranged on the cylindrical wall of the high-temperature flue gas mixing hearth (35) or at the bottom of the high-temperature flue gas mixing hearth (35).
  4. 4. The high-temperature flue gas circulation heating oil-rich heating furnace device is characterized in that the oil-rich conveying pipe is composed of two structural types, namely an oil-rich A disc-shaped conveying pipe (5) which is close to the inner wall of a high-temperature flue gas mixing furnace chamber (35) and extends towards the center of a furnace body and an oil-rich B disc-shaped conveying pipe (6) which is distributed around the periphery of a high-temperature flue gas jet guide cylinder (23) towards the inner wall of the furnace chamber (35) in a combined mode, and a vertical oil-rich disc combination is composed of an oil-rich A vertical conveying pipe (51) which is close to the inner wall of the high-temperature flue gas mixing furnace chamber (35) and vertically-distributed oil-rich B vertical conveying pipes (52) which are distributed around the periphery of the high-temperature flue gas jet guide cylinder (23) towards the inner wall of the furnace chamber (35).
  5. 5. The high-temperature flue gas circulation heating rich oil heating furnace device according to claim 4, wherein the rich oil A disc-shaped conveying pipe (5) is connected with a rich oil A input pipeline (7) arranged at the upper part of the heating furnace body (4) to obtain an input oil flow, and outputs a heated oil flow through a rich oil A disc-shaped output port (26) arranged at the lower part of the heating furnace body (4), and the rich oil B disc-shaped conveying pipe (6) is connected with a rich oil B input pipeline (9) through a rich oil B inlet flange (11) arranged at the upper part of the heating furnace body (4) to obtain an input oil flow, and simultaneously outputs a heated oil flow through a rich oil B disc-shaped output port (28) arranged at the lower part of the heating furnace body (4).
  6. 6. The high-temperature flue gas circulating heating oil-rich heating furnace device as claimed in claim 4, wherein the vertical oil-rich plate combination is respectively composed of a plurality of oil-rich A vertical conveying pipe assemblies arranged at the periphery of the inner cavity of the heating furnace body (4) and a group of oil-rich B vertical conveying pipe assemblies distributed around the high-temperature flue gas jet guide cylinder (23); the vertical rich oil A pipe assembly consists of an upper rich oil A distribution plate (47), a lower rich oil A collection plate (49) and a group of vertical rich oil A plate assemblies A (51) which are arranged in an inner cavity of a heating furnace body (4) and are arranged up and down, wherein the group of vertical rich oil A plate assemblies A (51) are arranged on the outer circle of the center of the furnace chamber and are composed of a plurality of rich oil A vertical rich oil pipes (51) connected between the upper rich oil A distribution plate and the lower rich oil A collection plate, the group of vertical rich oil A plate assemblies A (51) are respectively connected with an input pipeline of the rich oil A through the upper rich oil A distribution plate (47) arranged at the upper part of the inner cavity of the furnace body, and are connected with an output pipeline (26) of the rich oil A through the lower rich oil A collection plate (49) arranged at the lower part of the inner cavity of the furnace body, the vertical rich oil B pipe assemblies are arranged at the center of the furnace body (4), the upper rich oil B distribution plate (48) arranged between the upper rich oil A distribution plate (47) and the upper part of a high-temperature flue gas injection guide cylinder (23), the upper rich oil B distribution plate (48) is sleeved at the lower part of the high-temperature flue gas injection guide cylinder (23), and the upper rich oil B distribution plate (48) is arranged at the upper part of the upper rich oil B distribution plate (48) arranged at the upper part of the upper rich oil B, and the upper distribution plate (50) arranged at the upper part of the upper oil B The oil-rich B vertical conveying pipes (52) are formed by a plurality of oil-rich B vertical conveying pipes (52) between oil-rich B lower collecting plates (50), the oil-rich B vertical conveying pipes (52) are connected with an oil-rich B input pipe (9) through an upper oil-rich B distribution plate (48) at the upper part to obtain input oil-rich B, and the oil-rich B lower collecting plates (50) at the lower part are connected with an oil-rich B output pipeline (28) to output heated oil flow.
  7. 7. The high-temperature flue gas circulating heating oil-rich heating furnace device as claimed in claim 4, wherein the oil-rich A disc-shaped conveying pipe (5) and the oil-rich B disc-shaped conveying pipe (6) are approximately horizontally spirally distributed between the inner wall of the hearth and the high-temperature flue gas jet guide cylinder (23) from top to bottom.
  8. 8. The high-temperature flue gas circulating heating oil-rich heating furnace device as claimed in claim 4, wherein the oil-rich A disc-shaped conveying pipe (5) and the oil-rich B disc-shaped conveying pipe (6) are distributed between the inner wall of the hearth and the high-temperature flue gas jet guide cylinder (23) in a state of being perpendicular to the inner wall of the hearth and the high-temperature flue gas jet guide cylinder (23).
  9. 9. The high-temperature flue gas circulation heating rich oil heating furnace device according to claim 4 is characterized in that the inlets of the rich oil A disc-shaped conveying pipe (5) and the rich oil B disc-shaped conveying pipe (6) are respectively provided with a rich oil input thermometer (8) and a rich oil input thermometer (10), and the rich oil A outlet pipeline (26) and the rich oil B outlet pipeline (28) which correspond to the rich oil A disc-shaped conveying pipe (5) and the rich oil B disc-shaped conveying pipe (6) are respectively provided with a rich oil A output thermometer (25) and a rich oil B output thermometer (27).
  10. 10. A high-temperature flue gas circulation heating rich oil heating furnace device is characterized in that the inlets of a rich oil A vertical oil delivery pipe (51) and a rich oil B vertical oil delivery pipe (52) are respectively provided with a rich oil input thermometer (8) and a rich oil input thermometer (10), and the outlet pipeline (26) of a rich oil A lower collecting disc (49) and the outlet pipeline (28) of a rich oil B lower collecting disc (50) which correspond to the rich oil A vertical oil delivery pipe (51) and the rich oil B vertical oil delivery pipe (52) are respectively provided with a rich oil A output thermometer (25) and a rich oil B output thermometer (27).
  11. 11. The high-temperature flue gas circulation heating oil-rich heating furnace device according to claim 1, wherein a flue gas discharge regulating valve (15) and a flue gas discharge thermometer are respectively arranged on the flue gas discharge chimney (14).
  12. 12. The high-temperature flue gas circulating heating oil-rich heating furnace device as claimed in claim 1, wherein the heating furnace body (4) is provided with a furnace pressure transmitter (44) and a heating furnace explosion-proof valve (21).
  13. 13. A high-temperature flue gas circulation heating rich oil heating furnace device as claimed in claims 1-10, wherein the heating method comprises the steps that fuel gas is distributed to a fuel gas inlet (32) of each burner (31) through a fuel gas pipeline (34), combustion air provided by a combustion fan (1) enters an air preheater (13) through a combustion air pipeline (2), is distributed to a hot air inlet (33) of each burner (31) through a hot air pipeline (19) with a combustion air pipeline heat insulation material (17), high-temperature flue gas generated by combustion of the burners (31) enters a high-temperature flue gas jet guide cylinder (23), high-speed spraying is carried out on a rich oil medium in a heat pipe of a rich oil conveying pipe arranged in a hearth through a high-temperature flue gas jet hole (45), high-temperature flue gas discharged from a heating furnace body (4) enters a furnace body flue gas pipe (18), a part of the high-temperature flue gas enters an air preheater (13) to exchange heat with air and is discharged through a flue gas discharge chimney (14), a part of the high-temperature flue gas is sent into a high-temperature flue gas mixing hearth (35) through a circulation hot air pipeline (3) through a high-temperature circulation fan (38), the high-temperature flue gas is sprayed to the rich oil medium in the rich oil disc-shaped conveying pipe (5) and the rich oil disc-shaped conveying pipe (6) from the high-temperature flue gas spray hole (45) of the high-temperature flue gas spray guide cylinder (23) at a high speed after being subjected to heat supplement by the burner (31) and the combusted flue gas cylinder, so that the rich oil medium in the rich oil disc conveying pipe is heated.
  14. 14. An oil-rich heating furnace device for circularly heating high-temperature flue gas according to claims 1-10, wherein the process control method comprises the following steps: The heating method comprises the steps that fuel gas is distributed to a fuel gas inlet (32) of each combustor (31) through a fuel gas pipeline (34), combustion air provided by a combustion fan (1) enters an air preheater (13) through a combustion air pipeline (2), then is distributed to a hot air inlet (19) of each combustor (31) through a hot air pipeline (19) with a combustion air pipeline heat insulation material (17), high-temperature flue gas produced by combustion of the combustor (31) enters a high-temperature flue gas injection guide cylinder (23), high-speed injection is carried out on rich oil A disc-shaped conveying pipes (5) and rich oil B disc-shaped conveying pipes (6) through high-temperature flue gas injection holes (45), rich oil media in the two rich oil disc-shaped conveying pipes are heated, high-temperature flue gas discharged from a heating furnace body (4) enters a furnace body flue gas pipe (18), a part of the high-temperature flue gas enters the air preheater (13) to exchange heat with the hot air, then is discharged through a flue gas discharge chimney (14), and the other part of the high-temperature flue gas is delivered into a high-temperature flue gas mixed hearth (35) through the hot air pipeline (3) through the hot air circulation fan (38), and the high-temperature flue gas injection guide cylinder (31) and the high-temperature flue gas exhausted from the high-temperature flue gas disc-shaped conveying pipes (6) are arranged in the high-temperature disc-shaped conveying pipes (51) The oil-rich B vertical conveying pipe (52) heats the oil-rich medium in the pipe.
  15. 15. A high temperature flue gas circulation heated oil-rich heating furnace apparatus as claimed in claims 1-8, wherein the process control method comprises the following steps: When the device starts to work, when the temperature of the rich oil before entering the heating furnace is measured by the rich oil A input thermometer (8) and the rich oil B input thermometer (10) and data are input into a control system (the control system is not in the invention), the temperature of the rich oil after exiting the heating furnace is measured by the rich oil A output thermometer (25) and the rich oil B output thermometer (27) and the data are input into the control system, when the temperature value of the rich oil after exiting the heating furnace is measured by the rich oil A output thermometer (25) and the rich oil B output thermometer (27) deviates from a set value, the control system can adjust a gas regulating valve (42) on a gas pipeline (34), a gas flowmeter (43) feeds back the value to the control system, and meanwhile, the control system adjusts a combustion air regulating valve (40) on a combustion air pipeline (2), and the combustion air flowmeter feeds back air flow to the control system to accurately ensure the air-fuel ratio of the combustion system; 2) The control system adjusts the rotation speed of the smoke regulating valve (15) and the high-temperature smoke circulating fan (38) according to the numerical value of the pressure transmitter (44) in the furnace, controls the smoke emission amount in the smoke emission chimney (14), and maintains the pressure in the furnace to be a set furnace pressure value; 3) Through the parameter adjustment, the high-temperature flue gas temperature which enters the high-temperature flue gas injection guide cylinder (23) and is measured by the bottom thermometer (29) of the heating furnace is ensured to be a set value, so that the rich oil temperature measured by the rich oil A output thermometer (25) and the rich oil B output thermometer (27) is ensured to reach the set value; 4) The exhaust flue gas thermometer (16) detects the flue gas exhaust temperature in the exhaust chimney (14), the heating furnace outlet thermometer (20) monitors the high-temperature flue gas temperature entering the furnace body flue gas pipe (18), the heating furnace upper thermometer (22) and the heating furnace middle thermometer (24) monitor the temperature change in the furnace, the furnace pressure transmitter (44) monitors the furnace pressure change, and when the furnace pressure exceeds a set value, the heating furnace explosion-proof valve (21) is opened for pressure relief.

Description

High-temperature flue gas circulation heating oil-rich heating furnace device and heating method thereof Technical Field The invention relates to a high-temperature flue gas circulating heating oil-rich heating furnace device and a heating method thereof, belonging to the technical field of chemical equipment or chemical heating. Background Tube furnaces are important equipment in the oil refining industry, which function primarily to crack crude oil by heating, converting it into high value oils. The tube type heating furnaces are various and can be classified into horizontal tube type vertical furnaces, coil type vertical furnaces and vertical tube type vertical furnaces. Regardless of the type of heating furnace, the purpose is to seek a furnace which can improve the heating uniformity of the furnace tube, improve the surface heat intensity of the furnace tube, reduce the volume of the furnace chamber and improve the heat efficiency of the furnace chamber. Due to production requirements, several media (e.g., saturated steam and rich oil) are sometimes heated simultaneously in one furnace. The heating furnace basically consists of two main parts, namely a radiation section and a convection section. The bottom of the furnace (the top of the furnace is also provided with a burner (the burning medium is provided with fuel oil or fuel gas), a horizontal pipe (or a coil pipe) or a vertical pipe for heating the medium is arranged in the radiation section, the upper part of the furnace is a convection section, a heat exchanger is arranged in the convection section to preheat the low-temperature rich oil and then enter the radiation section, and an air preheater is arranged above the convection section (the heat exchanger) to further recover the waste heat of the discharged flue gas, greatly reduce the temperature of the discharged flue gas and improve the heating efficiency of the heating furnace. FIG. 4 shows a fuel-rich heating furnace commonly used at present Such a furnace, which is now operated, has the following disadvantages: 1) Poor uniformity of temperature in the furnace In the radiant heating section, the burner 45 is arranged at the bottom of the furnace, and high-temperature flame can contact the heated medium pipe, so that the part of the contacted medium pipe is heated seriously, even the flow speed of the rich oil in the pipe is influenced by the formation of rich oil carbon in the pipe, the temperature of the medium pipe is further increased, and the medium pipe is burnt through when serious. In order to avoid this detrimental phenomenon, the furnace diameter is increased when designing the furnace so that the medium pipe is far from the flame zone. The result is an increase in the volume of the furnace in the radial direction. For the vertical radiant tube, the non-uniformity coefficient (average temperature/maximum temperature) in the height direction is 0.72-0.8, and the radial non-uniformity coefficient is only about 0.53. And the high-temperature flame directly rushes to the top of the furnace from the bottom of the furnace, so that the thermal efficiency of the furnace body is reduced. 2) The volume of the hearth is larger In order to avoid that the high-temperature flue gas takes away a large amount of heat and reduce the heat efficiency of the furnace, a medium heat exchanger (convection heating section) is arranged at the top of the furnace, and the entering medium-rich oil is preheated by the medium heat exchanger and then enters the heating furnace. Thus, most of the waste heat of the flue gas can be recovered, and the overall heat efficiency of the furnace can be improved, but the overall height of the heating furnace is increased. 3) Low thermal efficiency In the present heating furnace structure, the heating furnace body 4 is called a radiant heating section, and the heat exchanger at the upper part of the furnace is called a convection heating section. In terms of medium heating temperature, when the temperature in the furnace does not exceed 650 ℃, the radiant heating efficiency is not high, and the heat transfer process is mainly convection. The current furnace type ensures that the flow rate of the flue gas of the heating furnace body is small, reduces the share of convection heating, and has lower heating efficiency due to the comprehensive effect of the heating furnace body. 4) N Ox is higher The burner used in the heating furnace is generally a conventional burner, and when the heat value of a combustion medium is high (such as fuel oil or natural gas), the generation amount of NOx is high, so that the emission standard is difficult to reach. In order to reduce the generation amount of NOx, the most adopted mode is flue gas circulation combustion at present, namely, part of discharged flue gas is pumped back and mixed into combustion air, so that the oxygen content of the combustion air is reduced, and the purpose of reducing the NOx content is achieved. However, when the he