Flue gas recirculation gasification furnace discharged carbon cooling system
By using water-cooled spiral and flue gas recirculation dual-stage cooling technology in the gasifier carbon discharge cooling system, the problem of spontaneous combustion of carbon accumulation is solved, and safe cooling and hazardous discharge of carbon is achieved.
Patent Information
- Application Number
- CN202421924167.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The carbon outflow of the gasifier is prone to accumulation and spontaneous combustion during the collection process. The existing cooling method is single, and the safety of carbon outflow cannot be effectively guaranteed.
A dual-stage cooling system for water-cooled spiral and flue gas recirculation is adopted to perform first-stage cooling through a water-cooled spiral machine, and a flue gas recirculation is used to form an oxygen-deficient environment, and the uncooled Mars in the carbon is extinguished in the screw machine.
Effectively reduce the carbon output temperature, eliminate the potential for spontaneous combustion of materials accumulation, and ensure the safety of material discharge.
Smart Images
Figure CN222893142U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a carbon outlet cooling system for a gasifier, in particular to a carbon outlet cooling system for a gasifier with flue gas recirculation, which adopts a water-cooled spiral and a flue gas recirculation double-stage cooling method and can reduce the carbon outlet temperature while preventing the hidden danger of spontaneous combustion of material accumulation. Background Art
[0002] The carbon particles produced by the gasification furnace are usually in a high temperature state when discharged from the furnace body. Some of the carbon particles are accompanied by sparks of carbon powder that has not been completely reacted in the furnace. If they are not cooled, the collection process is prone to spontaneous combustion accidents. The cooling methods used in the market are generally relatively simple and cannot well guarantee the safety of carbon discharge. Accumulation spontaneous combustion accidents still occur from time to time. Utility Model Content
[0003] In view of the above problems, the main purpose of the utility model is to provide a gasifier carbon outlet cooling system with flue gas recirculation that adopts water-cooled spiral and flue gas recirculation two-stage cooling to reduce the carbon outlet temperature while eliminating the hidden danger of spontaneous combustion of material accumulation.
[0004] The utility model solves the above technical problems through the following scheme: a flue gas recirculation gasification furnace carbon outlet cooling system, the flue gas recirculation gasification furnace carbon outlet cooling system comprises: a bag filter, an induced draft fan, a flue gas reheater, a desulfurization tower, a chimney, a water-cooled screw machine, a booster circulation fan, and a flue gas bypass inlet gate valve.
[0005] The main flue gas duct is sequentially provided with a bag filter, an induced draft fan, a flue gas reheater, a desulfurization tower, the flue gas reheater is connected to a chimney via a pipeline, and the desulfurization tower is connected to the flue gas reheater via pipelines both above and below.
[0006] A smoke exhaust duct is provided on the flue gas reheater. The smoke exhaust duct is divided into two branches, one of which is connected to the chimney, and the other is connected to the water-cooled screw machine through the booster circulation fan. The water-cooled screw machine is connected to the main flue gas duct for the air intake of the bag filter through a pipe; the water-cooled screw machine is connected to the carbon outlet of the gasifier.
[0007] The exhaust oxygen content measuring point and the exhaust temperature measuring point are set on the main flue in front of the chimney; the exhaust oxygen content measuring point is interlocked with the flue bypass inlet valve and the booster circulation fan.
[0008] In a specific implementation example of the present utility model, another branch of the smoke exhaust duct leads a bypass flue gas, which is pressurized by the booster fan, flows through a water-cooled screw machine, absorbs part of the heat of the material, and then returns to the flue in front of the dust collector to merge with the main flue gas to form a flue gas recirculation cooling system.
[0009] In a specific implementation example of the utility model, the inlet and outlet of the water-cooled screw machine are provided with a screw machine feed gate and a screw machine discharge gate.
[0010] In a specific implementation example of the utility model, the water-cooled spiral machine is a spiral machine made of stainless steel, and has a multi-stage spiral structure inside.
[0011] In a specific implementation example of the present utility model, the bypass flue gas return duct is provided with a flue gas bypass outlet gate valve for subsequent bypass duct equipment maintenance.
[0012] In a specific implementation example of the present utility model, the boost circulation fan is a boost circulation fan with a heat resistance temperature not lower than 150°C.
[0013] In a specific implementation example of the present utility model, the flue gas reheater is a flue gas reheater made of stainless steel and having a spiral fin tube structure.
[0014] In a specific implementation example of the utility model, the induced draft fan is a high temperature resistant fan with a heat resistance temperature not lower than 250°C, the induced draft fan flow is the sum of the main flue and bypass circulating flue gas flow, and the front and rear flue connections of the induced draft fan are in the form of soft connections.
[0015] In a specific implementation example of the present utility model, the desulfurization tower adopts a wet spray tower structure, the desulfurization tower is a stainless steel tower, and a demister is arranged in the desulfurization tower.
[0016] The positive progressive effect of the utility model is that compared with common similar technologies, the carbon outlet cooling system of the gasifier with flue gas recirculation provided by the utility model adopts water-cooling spiral and flue gas recirculation two-stage cooling. While lowering the carbon outlet temperature, it utilizes the oxygen-deficient environment to extinguish uncooled sparks entrained in the carbon outlet in the water-cooling spiral, completely eliminating the hidden danger of spontaneous combustion of material accumulation and ensuring safe discharge. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0018] The following are the names corresponding to the label numbers in this utility model:
[0019] 1-Bag collector, 2-Induced draft fan, 3-Flue gas reheater, 4-Desulfurization tower, 5-Chimney, 6-Water-cooled screw machine, 7-Screw machine feed gate, 8-Screw machine discharge gate, 9-Booster circulation fan, 10-Flue gas bypass inlet gate valve, 11-Flue gas bypass outlet gate valve, 12-Exhaust gas oxygen content measuring point, 13-Exhaust gas temperature measuring point. DETAILED DESCRIPTION
[0020] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solution of the present invention in detail.
[0021] Figure 1It is a schematic diagram of the overall structure of the utility model, such as Figure 1 As shown: the gasification furnace carbon outlet cooling system with flue gas recirculation provided by the utility model includes a bag filter 1, an induced draft fan 2, a flue gas reheater 3, a desulfurization tower 4, a chimney 5, a water-cooled screw machine 6, a screw machine feed gate 7, a screw machine discharge gate 8, a booster circulation fan 9, a flue gas bypass inlet gate valve 10, a flue gas bypass outlet gate valve 11, an exhaust gas oxygen content measuring point 12, and an exhaust gas temperature measuring point 13.
[0022] The high-temperature carbon produced by the gasification furnace is first cooled by the water-cooled screw machine 6 to reduce the carbon temperature. At the same time, the recycled flue gas is introduced into the screw machine to form an oxygen-deficient environment in the screw machine to perform secondary cooling on the material.
[0023] After the main flue gas passes through the bag filter 1 for dust removal, it enters the induced draft fan 2, releases heat through the high temperature end of the flue gas reheater 3, is washed by the desulfurization tower 4, returns to the low temperature end of the flue gas reheater 3 to absorb heat and heat up, and after removing the flue gas mist, enters the chimney 5 for discharge; a bypass is set in front of the chimney 5 to draw a bypass flue gas, which is pressurized by the booster circulation fan 9, flows through the water-cooled screw machine 6, absorbs part of the heat of the material, and then returns to the flue before the dust collector 1 to merge with the main flue gas to form a flue gas recirculation cooling system.
[0024] The main flue in front of chimney 5 is provided with exhaust oxygen content measuring point 12, which is interlocked with flue bypass inlet gate valve 10 and booster circulation fan 9. The main flue in front of chimney 5 is provided with exhaust temperature measuring point 13 to monitor exhaust temperature in real time. The bypass flue gas inlet and outlet flue gas ducts are provided with flue gas bypass inlet gate valve 10 and flue gas bypass outlet gate valve 11 for subsequent bypass maintenance.
[0025] The water-cooled screw machine 6 is provided with a screw machine feed gate 7 and a screw machine discharge gate 8 for feeding and discharging. The screw machine feed gate 7 is opened during feeding. When the feed fills the entire screw machine, the feeding is stopped, the screw machine feed gate 7 is closed, and after the bypass flue gas circulates for a period of time, the screw machine discharge gate 8 is opened to discharge and bag. The screw machine is fixed on the ground foundation.
[0026] A dust discharge gate is provided at the bottom of the bag dust collector 1 and fixed on the ground foundation. The bags in the dust collector need to be replaced in time, and the dust discharge gate discharges dust regularly to avoid system blockage.
[0027] The induced draft fan 2 is placed in front of the desulfurization tower 4. A high-temperature resistant fan should be used. The heat-resistant temperature should not be lower than 250°C. The fan flow rate is the sum of the main flue and bypass circulating flue gas flows. The flue connections before and after the fan must be in the form of soft connections.
[0028] The flue gas reheater 3 is made of stainless steel and has a spiral fin tube indirect heat exchange structure. The heat release side and the heat absorption side should be isolated and sealed. The outlet flue gas temperature on the heat absorption side should be greater than 120°C to completely eliminate liquid moisture in the exhaust gas. The inlet flue gas temperature on the heat release side should be higher than 200°C, and the flow area on the heat release side should be greater than that on the heat absorption side.
[0029] The desulfurization tower 4 adopts a wet spray tower structure and is made of stainless steel. A demister is installed in the tower to minimize the moisture carried by the flue gas exhaust.
[0030] The boost circulation fan 9 should be a high-temperature fan with a heat-resistant temperature of no less than 150°C. The structure should adopt a conventional blower form, and the wind pressure should not be too high to avoid bypass smoke leakage.
[0031] The working process of the utility model system is: during the operation of the gasifier system, the main flue gas passes through the bag filter 1, the induced draft fan 2, the flue gas reheater 3, and the desulfurization tower 4 and enters the chimney 5 for discharge. At this time, the bypass system is not put into operation, and the water-cooled screw machine 6, the screw machine feed gate 7, the screw machine discharge gate 8, the booster circulation fan 9, the flue gas bypass inlet gate valve 10, and the flue gas bypass outlet gate valve 11 are all in a closed state; after a period of stable operation, before preparing to discharge, observe the exhaust gas oxygen content measuring point 12 in front of the main flue chimney 5, and the data of this measuring point must be less than 5%, observe the exhaust gas temperature measuring point 13 in front of the main flue chimney 5, and the data of this measuring point is greater than 5%. At 120℃; then manually open the flue gas bypass inlet valve 10 and the flue gas bypass outlet valve 11, and turn on the booster circulation fan 9 to allow the bypass flue gas to flow through the water-cooled screw machine 6 and return to the main flue; then turn on the water-cooled screw machine 6, open the screw machine feed gate 7, and allow the material to enter the screw machine. After the material fills the screw machine, close the screw machine 6 and the screw machine feed gate 7. At this time, the screw machine is used as a transfer silo. The material stays in the screw machine, and the bypass flue gas blows over the material continuously, taking away part of the heat while generating an oxygen-deficient environment to extinguish the uncooled sparks entrained in the carbon. This process lasts for about fifteen minutes. After the material in the screw machine is completely cooled, open the screw machine discharge gate 8, and turn on the water-cooled screw machine 6 to discharge and bag. After the first discharge is stable, open the exhaust oxygen content measuring point 12, and interlock with the flue bypass inlet gate valve 10 and the booster circulation fan 9 to make the bypass flue gas circulation run automatically; the subsequent discharge repeats the above screw machine and inlet and outlet gate operation.
[0032] The carbon outlet cooling system of the gasifier with flue gas recirculation provided by the utility model adopts a water-cooled spiral and a flue gas recirculation two-stage cooling, which reduces the carbon outlet temperature and utilizes the oxygen-deficient environment to extinguish the uncooled sparks entrained in the carbon outlet in the spiral machine, thus completely eliminating the hidden danger of spontaneous combustion of material accumulation and ensuring safe operation.
[0033] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. A flue gas recirculation gasifier carbon cooling system, characterized in that: The flue gas recirculation gasifier carbon outlet cooling system includes: bag filter, induced draft fan, flue gas reheater, desulfurization tower, chimney, water-cooled screw machine, booster circulation fan, flue gas bypass inlet gate valve; The main flue gas duct is provided with a bag filter, an induced draft fan, a flue gas reheater, a desulfurization tower, and the flue gas reheater is connected to a chimney through a pipeline. The desulfurization tower is connected to the flue gas reheater through pipelines above and below. The flue gas reheater is provided with a smoke exhaust pipe, which is divided into two branches, one of which is connected to the chimney, and the other is connected to the water-cooled screw machine through the booster circulation fan. The water-cooled screw machine is connected to the main flue gas pipe of the bag filter air intake through a pipe; the water-cooled screw machine is connected to the carbon outlet of the gasifier; The exhaust oxygen content measuring point and the exhaust temperature measuring point are set on the main flue in front of the chimney; the exhaust oxygen content measuring point is interlocked with the flue bypass inlet valve and the booster circulation fan.
2. The carbon outlet cooling system of a gasifier with flue gas recirculation according to claim 1, characterized in that: The other branch of the exhaust duct draws a bypass flue gas, which is pressurized by the booster fan, flows through the water-cooled screw machine, absorbs part of the heat of the material, and then returns to the flue before the dust collector to merge with the main flue gas to form a flue gas recirculation cooling system.
3. The carbon outlet cooling system of a gasifier with flue gas recirculation according to claim 1, characterized in that: The inlet and outlet of the water-cooled screw machine are provided with a screw machine feed gate and a screw machine discharge gate.
4. The carbon outlet cooling system of a gasifier with flue gas recirculation according to claim 1, characterized in that: The water-cooled spiral machine is made of stainless steel and has a multi-section spiral structure inside.
5. The carbon outlet cooling system of a gasifier with flue gas recirculation according to claim 1, characterized in that: The bypass flue gas return duct is provided with a flue gas bypass outlet gate valve for subsequent bypass duct equipment maintenance.
6. The carbon outlet cooling system of a gasifier with flue gas recirculation according to claim 1, characterized in that: The booster circulation fan is a booster circulation fan with a heat resistance temperature not lower than 150°C.
7. The carbon outlet cooling system of a gasifier with flue gas recirculation according to claim 1, characterized in that: The flue gas reheater is made of stainless steel and has a spiral fin tube structure.
8. The carbon outlet cooling system of a gasifier with flue gas recirculation according to claim 1, characterized in that: The induced draft fan is a high temperature resistant fan with a heat resistance temperature not lower than 250°C. The fan flow rate of the induced draft fan is the sum of the main flue and bypass circulating flue gas flow rates. The front and rear flue connections of the induced draft fan are in the form of soft connections.
9. The carbon outlet cooling system of a gasifier with flue gas recirculation according to claim 1, characterized in that: The desulfurization tower adopts a wet spray tower structure. The desulfurization tower is a stainless steel tower with a demister installed inside.