Gasification furnace steam drum waste heat recycling system

Abstract

The utility model discloses a gasification furnace steam pocket waste heat recycling system belongs to coal chemical industry technical field, including steam pocket, deaerator and grinding water tank, and is connected with steam pocket fixed discharge valve and steam pocket connection discharge valve respectively on steam pocket, and the other end of steam pocket fixed discharge valve and steam pocket connection discharge valve is connected with steam pocket blowdown cut -out valve, and the blowdown cut -out valve is connected with deslagging pool hand valve and first discarding pipe hand valve respectively, and the other end of first discarding pipe hand valve is connected with second discarding pipe hand valve, and the inside of grinding water tank is provided with the pipe, and the other end of second discarding pipe hand valve is connected with pipe, and the other end of pipe is connected with into deaerator hand valve, and the other end of into deaerator hand valve is connected with deaerator. The utility model discloses a gasification furnace steam pocket waste heat recycling system can realize the multiple use of waste heat to the maximum, is favorable for reducing synthetic ammonia system comprehensive energy consumption, realizes the maximization of benefit.

Description

Technical Field

[0001] This utility model relates to the field of coal chemical technology, and in particular to a waste heat recovery and utilization system for a gasifier steam drum. Background Technology

[0002] A downward-flowing flame forms a high-temperature zone directly below the process burner in the gasifier. The burner is subjected to radiation from this high-temperature zone, and the decrease in metal strength at high temperatures, along with the scouring effect of the high-speed flowing coal-water slurry, frequently causes wear and thermal stress damage to the burner. To protect the burner, a water jacket is installed at its end. The burner is cooled by the circulating flow of cooling water from the boiler water drum within the water jacket.

[0003] The gasifier's water-cooled wall system and burner cooling water system share a boiler feedwater system. Boiler water from the boiler header is fed into the steam drum through a level regulation system. The boiler water in the steam drum is pressurized by a boiler water circulation pump and then fed into the gasifier's water-cooled wall system and burner cooling water system, respectively. When high-pressure oxygen and coal-water slurry react in the furnace, the temperature can reach about 1350℃. When the molten slag comes into contact with the water-cooled wall, it can quickly solidify to form a slag layer. The heat is forcibly circulated to the steam drum by the boiler water circulation pump, producing 3.8MPa steam as a byproduct. The steam drum is equipped with periodic and intermittent blowdown. The blowdown wastewater is discharged into the slag pool, causing heat waste. At the same time, the water in the slag pool is pumped to the true flash system by the slag pool pump, increasing the heat load of the true flash system. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat recovery and utilization system for gasifier steam drum, enabling multiple uses of waste heat from the gasifier steam drum. Modifying the slag removal tank of the steam drum wastewater helps reduce the load on the flash evaporation system of the slag-water unit. The coil design maximizes the utilization of waste heat; the heated organic wastewater is used as grinding water for slurry preparation, which helps increase the coal slurry temperature, reduce additive usage, and save costs. After initial heat exchange with the grinding water tank, the steam drum wastewater, under residual pressure, is sent to the deaerator of the slag-water unit to heat the low-pressure ash water in the deaerator, thereby reducing the amount of low-pressure steam used in the deaerator and achieving secondary heat utilization.

[0005] To achieve the above objectives, this utility model provides a gasifier steam drum waste heat recovery and utilization system, including a steam drum, a deaerator, and a grinding water tank. A steam drum fixed discharge valve and a steam drum continuous discharge valve are respectively connected to the steam drum. The other end of the steam drum fixed discharge valve and the steam drum continuous discharge valve are connected to a steam drum blow-off valve. The steam drum blow-off valve is respectively connected to a slag removal tank manual valve and a first coil removal manual valve. The other end of the first coil removal manual valve is connected to a second coil removal manual valve. A coil is installed inside the grinding water tank. The other end of the second coil removal manual valve is connected to the coil. The other end of the coil is connected to a deaerator inlet manual valve. The other end of the deaerator inlet manual valve is connected to the deaerator.

[0006] Preferably, the steam drum is connected to a steam delivery pressure reducing valve and a steam venting pressure regulating valve, and the other end of the steam venting pressure regulating valve is connected to a steam silencer.

[0007] Preferably, the grinding water tank is connected to a grinding water tank level regulating valve, an organic wastewater manual valve, and a grinding water pump.

[0008] Preferably, an exhaust cooler is connected to the deaerator, and a condenser separator is connected to the other end of the exhaust cooler. The condenser separator is connected to a deaerator pressure regulating valve and a separator level regulating valve.

[0009] Preferably, the deaerator is connected to a low-pressure steam flow regulating valve, a deaerator water pump, and a low-pressure ash water level regulating valve.

[0010] Preferably, it also includes a boiler water circulation pump, which is connected to the steam drum, and a steam drum makeup water level regulating valve is connected between the steam drum and the boiler water circulation pump.

[0011] Therefore, this utility model adopts the above-mentioned gasifier steam drum waste heat recovery and utilization system to realize the multiple utilization of waste heat from the gasifier steam drum. After modifying the slag removal tank of the steam drum wastewater, it is beneficial to reduce the load on the flash evaporation system of the slag water unit. The coil design can maximize the utilization of waste heat. The heated organic wastewater is used as grinding water for slurry making, which is beneficial to increase the coal slurry temperature, reduce the amount of additives, and save costs. The steam drum wastewater after the initial heat exchange with the grinding water tank is sent to the deaerator of the slag water unit under the action of residual pressure to heat the low-pressure ash water in the deaerator, thereby reducing the amount of low-pressure steam used in the deaerator and realizing the secondary utilization of heat.

[0012] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the gasifier steam drum waste heat recovery and utilization system in this utility model.

[0014] Figure Labels 1. Steam drum; 2. Steam delivery pressure reducing valve; 3. Steam venting pressure regulating valve; 4. Steam silencer; 5. Steam drum makeup water level regulating valve; 6. Steam drum fixed discharge valve; 7. Steam drum continuous discharge valve; 8. Steam drum blowdown shut-off valve; 9. Boiler water circulation pump; 10. Slag removal tank manual valve; 11. First coil manual valve; 12. Grinding water tank level regulating valve; 13. Second coil manual valve; 14. Deaerator inlet manual valve; 15. Organic wastewater manual valve; 16. Grinding water pump; 17. Deaerator; 18. Exhaust cooler; 19. Low-pressure steam flow regulating valve; 20. Deaerator pressure regulating valve; 21. Condenser separator; 22. Separator level regulating valve; 23. Deaerator water pump; 24. Grinding water tank; 25. Coil; 26. Low-pressure ash water level regulating valve. Detailed Implementation

[0015] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0016] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0017] like Figure 1As shown, a waste heat recovery system for a gasifier steam drum 1 is provided. The steam drum 1 has two drain ports. One drain port is connected to a steam drum fixed drain valve 6, preferably model HV003. The other drain port is connected to a steam drum continuous drain valve 7, preferably model HV004. Both the fixed drain valve 6 and the continuous drain valve 7 are connected to pipelines, which are interconnected. A steam drum drain shut-off valve 8, preferably model XV1005, is connected at the confluence of the two pipelines. The drain shut-off valve 8 has a low-level interlock shut-off function to prevent the steam drum 1 from drying out. The other end of the sewage shut-off valve 8 is connected to a pipeline, and the other end of the pipeline is connected to the slag removal tank hand valve 10 and the first coil removal hand valve 11 respectively. The other end of the slag removal tank hand valve 10 is connected to the slag tank (not shown in the figure). The other end of the first coil removal hand valve 11 is connected to a pipeline, and the other end of the pipeline is connected to the second coil removal hand valve 13. The grinding water tank 24 is equipped with a coil 25. The inlet of the coil 25 is connected to the second coil removal hand valve 13. The outlet of the coil 25 is connected to the deaerator inlet hand valve 14. The other end of the deaerator inlet hand valve 14 is connected to a pipeline. The deaerator 17 is equipped with an inlet interface, and the other end of the pipeline is connected to the inlet interface of the deaerator 17.

[0018] Steam drum 1 is provided with a steam outlet, and a steam outlet pressure reducing valve 2 is connected to the steam outlet. Preferably, the steam outlet pressure reducing valve 2 is model PV001. The other end of the steam outlet pressure reducing valve 2 is connected to a pipeline, and the other end of the pipeline is connected to a steam network (not shown in the figure). Steam drum 1 is provided with a steam vent, and a steam vent pressure regulating valve 3 is connected to the steam vent. Preferably, the steam vent pressure regulating valve 3 is model PV002. The other end of the steam vent pressure regulating valve 3 is connected to a pipeline, and the other end of the pipeline is connected to a steam silencer 4.

[0019] The grinding water tank 24 is equipped with a fresh water inlet, and a grinding water tank level regulating valve 12 is connected to the fresh water inlet. Preferably, the grinding water tank level regulating valve 12 is model LV006. The other end of the grinding water tank level regulating valve 12 is connected to a pipeline, and the other end of the pipeline is connected to a fresh water source (not shown in the figure). The grinding water tank 24 is equipped with an organic wastewater inlet, and an organic wastewater manual valve 15 is connected to the organic wastewater inlet. The other end of the organic wastewater manual valve 15 is connected to a pipeline, and the other end of the pipeline is connected to an organic wastewater source (not shown in the figure). The grinding water tank 24 is equipped with a water outlet, and a pipeline is connected to the water outlet. The other end of the pipeline is connected to a grinding water pump 16, which is used to send wastewater to the coal mill for slurry.

[0020] The deaerator 17 is equipped with an exhaust port, and a pipeline is connected to the exhaust port of the deaerator 17. The other end of the pipeline is connected to an exhaust cooler 18, and the other end of the exhaust cooler 18 is connected to a pipeline. The other end of the pipeline is connected to a condenser separator 21. The condenser separator 21 is equipped with an exhaust port and a drain port. The exhaust port of the condenser separator 21 is connected to a deaerator pressure regulating valve 20. Preferably, the deaerator pressure regulating valve 20 is model PV009. The other end of the deaerator pressure regulating valve 20 is connected to a pipeline. The other end of the pipeline is connected to a sulfur recovery device (not shown in the figure). The drain port of the condenser separator 21 is connected to a separator level regulating valve 22. Preferably, the separator level regulating valve 22 is model LV008. The other end of the separator level regulating valve 22 is connected to a pipeline. The other end of the pipeline is connected to an ash water tank (not shown in the figure).

[0021] The deaerator 17 is equipped with a low-pressure steam inlet, and a low-pressure steam flow regulating valve 19 is connected to the low-pressure steam inlet. Preferably, the low-pressure steam flow regulating valve 19 is model FV0010. The other end of the low-pressure steam flow regulating valve 19 is connected to a pipeline, and the other end of the pipeline is connected to a low-pressure steam source (not shown in the figure). The deaerator 17 is equipped with a low-pressure ash water inlet, and a low-pressure ash water level regulating valve 26 is connected to the low-pressure ash water inlet. Preferably, the low-pressure ash water level regulating valve 26 is model LV0011. The other end of the low-pressure ash water level regulating valve 26 is connected to a pipeline, and the other end of the pipeline is connected to a low-pressure ash water source (not shown in the figure). The deaerator 17 is equipped with a water outlet, and a pipeline is connected to the water outlet of the deaerator 17. The other end of the pipeline is connected to a deaerator water pump 23, which is used to deliver deaerator water to the deaerator water user.

[0022] A waste heat recovery and utilization system for a gasifier steam drum 1 is provided. The steam drum 1 is provided with a boiler water outlet, which is connected to a pipeline. The other end of the pipeline is connected to a boiler water circulation pump 9, and the other end of the boiler water circulation pump 9 is connected to a gasifier water-cooled wall system (not shown in the figure). A steam drum makeup water level regulating valve 5 is connected to the pipeline between the steam drum 1 and the boiler water circulation pump 9. Preferably, the steam drum makeup water level regulating valve 5 is model LV007.

[0023] Working principle: Using boiler water circulation pump 9, a forced water circulation is established in the water-cooled wall of the gasifier. The heat carried out by boiler water circulation pump 9 is carried to steam drum 1, and after being reduced in pressure by steam delivery pressure reducing valve 2, it is sent to the steam pipeline network. If there is overpressure in steam drum 1, it is vented to steam silencer 4 through steam venting pressure regulating valve 3. The liquid in the steam drum 1 passes through the steam drum continuous discharge valve 7 and the steam drum fixed discharge valve 6, and then sequentially passes through the steam drum 1 steam drum drain shut-off valve 8, the first coil hand valve 11, and the second coil hand valve 13 into the coil 25 inside the grinding water tank 24 to complete the initial heat exchange. After heat exchange, the wastewater from the steam drum 1 enters the deaerator 17 through the deaerator hand valve 14 under residual pressure, thus completing heat recovery, reducing the consumption of low-pressure steam, and the deoxygenated water after deoxygenation is pumped to the deoxygenated water user. After the gas phase of the deaerator 17 is cooled by the exhaust cooler 18, it enters the condenser separator 21 and is then sent to the sulfur recovery unit through the deaerator pressure regulating valve 20. The liquid phase is sent to the ash water tank through the separator level regulating valve 22. Part of the water in the grinding water tank 24 is used to digest the wastewater in the park through the organic wastewater hand valve 15, and the other part is used to replenish fresh water through the grinding water tank level regulating valve 12 to balance the organic wastewater. The water in the heated grinding water tank 24 is sent to the coal mill for slurry through the grinding water pump 16. The water consumption from by-product steam and sewage discharge in steam drum 1 is provided through steam drum water level regulating valve 5.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A waste heat recovery and utilization system for a gasifier steam drum, characterized in that: The system includes a steam drum, a deaerator, and a grinding water tank. A steam drum fixed discharge valve and a steam drum continuous discharge valve are connected to the steam drum. The other end of each of the steam drum fixed discharge valve and continuous discharge valve is connected to a steam drum blowdown shut-off valve. The blowdown shut-off valve is connected to a slag removal tank manual valve and a first coil removal manual valve. The other end of the first coil removal manual valve is connected to a second coil removal manual valve. A coil is installed inside the grinding water tank. The other end of the second coil removal manual valve is connected to the coil. The other end of the coil is connected to a deaerator inlet manual valve, and the other end of the deaerator inlet manual valve is connected to the deaerator.

2. The gasifier steam drum waste heat recovery and utilization system according to claim 1, characterized in that: The steam drum is connected to a steam delivery pressure reducing valve and a steam venting pressure regulating valve, and the other end of the steam venting pressure regulating valve is connected to a steam silencer.

3. The gasifier steam drum waste heat recovery and utilization system according to claim 1, characterized in that: The grinding water tank is equipped with a grinding water tank level regulating valve, an organic wastewater manual valve, and a grinding water pump.

4. The gasifier steam drum waste heat recovery and utilization system according to claim 1, characterized in that: The deaerator is connected to an exhaust cooler, and the other end of the exhaust cooler is connected to a condenser separator. The condenser separator is connected to a deaerator pressure regulating valve and a separator level regulating valve.

5. A gasifier steam drum waste heat recovery and utilization system according to claim 4, characterized in that: The deaerator is equipped with a low-pressure steam flow regulating valve, a deaerator water pump, and a low-pressure ash water level regulating valve.

6. The gasifier steam drum waste heat recovery and utilization system according to claim 1, characterized in that: It also includes a boiler water circulation pump, which is connected to the steam drum, and a steam drum makeup water level regulating valve is connected between the steam drum and the boiler water circulation pump.

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