CN214693386U - Device for graded utilization of coal chemical industry gasified black water heat - Google Patents
Device for graded utilization of coal chemical industry gasified black water heat Download PDFInfo
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- CN214693386U CN214693386U CN202120555557.7U CN202120555557U CN214693386U CN 214693386 U CN214693386 U CN 214693386U CN 202120555557 U CN202120555557 U CN 202120555557U CN 214693386 U CN214693386 U CN 214693386U
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Abstract
The utility model belongs to a device for grading utilization of heat of gasified black water in coal chemical industry; the device comprises a gasified black water pipeline, wherein the gasified black water pipeline is connected with a low-pressure flash tank through a gasified grey water heating system, a liquid phase outlet of the low-pressure flash tank is connected with a vacuum flash tank through tube passes of a micro-positive pressure flash tank and a desalted water preheater in sequence, and a liquid phase outlet of the vacuum flash tank is connected with a clarifying tank; the top gas phase outlet of the micro-positive pressure flash tank is connected with the flash evaporator energy utilization and recovery system; have reasonable in design, can realize the multistage utilization to black water heat energy through gasification buck heating system, low pressure flash tank, pressure-fired flash tank, demineralized water pre-heater and vacuum flash tank, further not only can effectively utilize black water heat energy through setting up pressure-fired flash tank and demineralized water pre-heater, can also effectively prevent the advantage of a large amount of enrichment of acid gas and consumption a large amount of circulating water, steam consumption and electricity simultaneously.
Description
Technical Field
The utility model belongs to the technical field of coal chemical industry gasification black water treatment, specifically be a device that coal chemical industry gasification black water heat utilized in grades.
Background
The novel coal chemical gasification process generally adopts a coal water slurry gasification furnace or a pulverized coal gasification furnace, and the gasification pressure is generally as follows: 2.5MPag-8.7MPag, a gasification furnace and crude gas are washed to obtain gasified black water, the black water heat energy is recovered through two-stage or three-stage flash evaporation under the normal condition of the gasified black water, the black water heat energy is recovered through the general high-pressure flash evaporation pressure (0.8 +/-0.1) MPag, the low-pressure flash evaporation pressure (0.25 +/-0.05) MPag and the vacuum flash evaporation pressure (-60 +/-10) KPag, and the black water heat energy recovered through the mode mainly has the following problems: (1) a large amount of acid gas is enriched in flash steam of a certain stage, so that the flash equipment and the pipeline of the stage are seriously corroded; (2) the inlet temperature of the vacuum flash evaporation is high, and the amount of vacuum flash steam is large, so that the circulating water consumption of the vacuum flash evaporation condenser is high, and the steam consumption and the power consumption of a vacuum system are high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the defect among the prior art, and provide a reasonable in design, can be through gasification buck heating system, the low pressure flash tank, the pressure-fired flash tank, desalted water pre-heater and vacuum flash tank realize the multistage utilization to black water heat energy, further not only can effectively utilize black water heat energy through setting up pressure-fired flash tank and desalted water pre-heater, can also effectively prevent acid gas enrichment in a large number and consume a large amount of circulating water simultaneously, the device of the coal chemical industry gasification black water heat fractional utilization of steam consumption and electricity.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a device for graded utilization of coal chemical industry gasified black water heat comprises a gasified black water pipeline, wherein the gasified black water pipeline is connected with a low-pressure flash tank through a gasified grey water heating system, a liquid phase outlet of the low-pressure flash tank is connected with a vacuum flash tank through tube passes of a micro-positive pressure flash tank and a desalted water preheater in sequence, and a liquid phase outlet of the vacuum flash tank is connected with a clarifying tank; and a top gas phase outlet of the micro-positive pressure flash tank is connected with a flash evaporator energy utilization and recovery system.
Preferably, the gasification grey water heating system comprises a hot evaporation water tower and a shift stripping tower connected with a gas phase outlet at the top of the hot evaporation water tower; the evaporation hot water tower comprises a lower tower arranged at the bottom of the evaporation hot water tower and an upper tower arranged at the top of the lower tower, and a partition plate with an air cap is arranged between the lower tower and the upper tower; the middle part of the upper tower is connected with a gasification grey water pipeline, and the middle part of the lower tower is communicated with a gasification black water pipeline; a pipeline connected with the hot water tank is arranged on the evaporation hot water tower on one side of the upper part of the clapboard; the bottom liquid phase outlet of the lower tower is connected with a low-pressure flash tank.
Preferably, the gas phase outlet of the low-pressure flash tank is connected with a deaerator.
Preferably, a shell side inlet of the desalted water preheater is connected with a desalted water supply pipeline, and a shell side outlet of the desalted water preheater is connected with a desalted water return pipeline.
Preferably, a vacuum flash tail gas treatment system is arranged at the top of the vacuum flash tank.
Preferably, the flash evaporator energy utilization and recovery system comprises a heat energy two-stage utilization unit and a heat energy power generation unit; the heat energy two-stage utilization unit comprises a working medium evaporator connected with a gas phase outlet at the top of the micro-positive pressure flash tank, a liquid phase outlet at the bottom of the working medium evaporator is connected with a condensate separating tank, a gas phase outlet of the condensate separating tank is connected with an acid gas torch burner, and a liquid phase outlet at the bottom of the condensate separating tank is connected with a clarifying tank through a condensate pump, a first inlet of a working medium preheater and a first outlet of the working medium preheater.
Preferably, the heat energy power generation unit comprises a working medium expander with a power generator, an outlet of the working medium expander is connected with a working medium inlet of the working medium evaporator sequentially through a water cooler, a working medium pump, a second inlet of the working medium preheater and a second outlet of the working medium preheater, and a working medium outlet of the working medium evaporator is connected with an inlet of the working medium expander.
The device for graded utilization of black water heat in coal chemical gasification is prepared according to the scheme, the acid gas can be effectively collected by arranging the micro-positive pressure flash tank, the heat energy in the acid gas can be effectively recovered, the corrosion of flash equipment and pipelines caused by enrichment is avoided, the temperature of black water is reduced again by using the desalted water preheater, the effective recovery of black water heat energy can be realized by the synergistic action of the micro-positive pressure flash tank and the desalted water preheater, the defects of high circulating water consumption, high steam consumption and high power consumption in the subsequent working section are avoided, the device has reasonable design, the multi-grade utilization of black water heat energy can be realized by the gasification grey water heating system, the low-pressure flash tank, the micro-positive pressure flash tank, the desalted water preheater and the vacuum flash tank, and the black water heat energy can be effectively utilized by arranging the micro-positive pressure flash tank and the desalted water preheater, meanwhile, the method can also effectively prevent a large amount of acid gas from being enriched and consume a large amount of circulating water, steam and electricity.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the medium evaporation hot water tower of the present invention.
In the upper diagram:
1. a gasification black water pipeline; 2. an evaporation hot water tower; 2-1, removing from the tower; 2-2, feeding into a tower; 2-3, air cap; 2-4, a partition board; 3. a working medium outlet; 4. a low-pressure flash tank; 5. a micro-positive pressure flash tank; 6. a desalted water preheater; 7. a vacuum flash tank; 8. a clarifying tank; 9. a gasification grey water conduit; 10. a shift stripping column; 11. a hot water tank; 12. a deaerator; 13. a working medium evaporator; 14. a working medium expander; 15. a generator; 16. a water cooler; 17. a working medium pump; 18. a working medium preheater; 19. a condensate pump; 20. an acid gas flare burner; 21. a condensate separation tank; 22. a vacuum flash tail gas treatment system; 23. a desalted water return pipeline; 24. a desalted water supply pipeline; 25. a first inlet; 26. a first outlet; 27. a second inlet; 28. a second outlet; 29. and a working medium inlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to FIGS. 1-2: the utility model relates to a device for graded utilization of coal chemical industry gasification black water heat, in particular to a device for graded utilization of coal chemical industry gasification black water heat, which comprises a gasification black water pipeline 1, wherein the gasification black water pipeline 1 is connected with a low-pressure flash tank 4 through a gasification grey water heating system, a liquid phase outlet of the low-pressure flash tank 4 is connected with a vacuum flash tank 7 through a pipe pass of a micro-positive pressure flash tank 5 and a desalted water preheater 6 in sequence, and a liquid phase outlet of the vacuum flash tank 7 is connected with a clarifying tank 8; and a top gas phase outlet of the micro-positive pressure flash tank 5 is connected with a flash evaporator energy utilization and recovery system. The gasification grey water heating system comprises an evaporation hot water tower 2 and a transformation stripping tower 10 connected with a gas phase outlet at the top of the evaporation hot water tower 2; the evaporation hot water tower 2 comprises a lower tower 2-1 arranged at the bottom of the evaporation hot water tower 2 and an upper tower 2-2 arranged at the top of the lower tower 2-1, and a partition plate 2-4 with an air cap 2-3 is arranged between the lower tower 2-1 and the upper tower 2-2; the middle part of the upper tower 2-2 is connected with a gasification grey water pipeline 9, and the middle part of the lower tower 2-1 is communicated with a gasification black water pipeline 1; a pipeline connected with the hot water tank 11 is arranged on the evaporation hot water tower 2 on one side of the upper part of the partition plate 2-4; the bottom liquid phase outlet of the lower column 2-1 is connected with a low-pressure flash tank 4. And a gas phase outlet of the low-pressure flash tank 4 is connected with a deaerator 12. The shell side inlet of the desalted water preheater 6 is connected with a desalted water supply pipeline 24, and the shell side outlet of the desalted water preheater 6 is connected with a desalted water return pipeline 23. The top of the vacuum flash tank 7 is provided with a vacuum flash tail gas treatment system 22. The flash evaporator energy utilization and recovery system comprises a heat energy two-stage utilization unit and a heat energy power generation unit; the heat energy two-stage utilization unit comprises a working medium evaporator 13 connected with a gas-phase outlet at the top of the micro-positive pressure flash tank 5, a liquid-phase outlet at the bottom of the working medium evaporator 13 is connected with a condensate separation tank 21, a gas-phase outlet of the condensate separation tank 21 is connected with an acid gas torch burner 20, and a liquid-phase outlet at the bottom of the condensate separation tank 21 is connected with the clarifying tank 8 through a condensate pump 19, a first inlet 25 of a working medium preheater 18 and a first outlet 26 of the working medium preheater 18. The heat energy power generation unit comprises a working medium expander 14 with a power generator 15, an outlet of the working medium expander 14 is connected with a working medium inlet 29 of a working medium evaporator 13 sequentially through a water cooler 16, a working medium pump 17, a second inlet 27 of the working medium preheater 18 and a second outlet 28 of the working medium preheater 18, and a working medium outlet 3 of the working medium evaporator 13 is connected with an inlet of the working medium expander 14.
A heat grading utilization method of a device for grading utilization of coal chemical gasification black water heat comprises the following steps: the method comprises the following steps: the gasified black water enters a lower tower 2-1 of the evaporation hot water tower 2 through a gasified black water pipeline 1 and is subjected to reduced pressure flash evaporation; the flow of the gasified black water in the gasified black water pipeline 1 is as follows: 380-415 t/h, the temperature is as follows: 235-243 ℃; the pressure of a lower tower 2-1 in the evaporation hot water tower 2 is as follows: 0.75-0.95 MPag; the gas phase in the lower tower 2-1 in the evaporation hot water tower 2 enters the upper tower 2-2 of the evaporation hot water tower 2 through a gas cap 2-3, the gasification grey water entering the upper tower 2-2 from a gasification grey water pipeline 9 is heated, the heated gasification grey water enters a hot water tank 11, and the high-pressure flash steam at the tower top of the upper tower 2-2 enters a transformation stripping tower 10 for recycling; the pressure in the upper tower 2-2 in the evaporation hot water tower 2 is as follows: 0.7 to 0.9 MPag. Step two: the liquid phase at the bottom of a lower tower 2-1 of the evaporation hot water tower 2 enters a low-pressure flash tank 4 for reduced-pressure flash evaporation, and flash steam at the top of the low-pressure flash tank 4 enters a deaerator 12 for recycling; the liquid phase at the bottom of the low-pressure flash tank 4 enters a micro-positive pressure flash tank 5 for decompression and flash evaporation. The flash pressure in the low-pressure flash tank 4 is: 0.23-0.28 MPag; the flash pressure in the micro-positive pressure flash tank 5 is as follows: 0.02-0.04 MPag. Step three: the flash steam on the top of the micro-positive pressure flash tank 5 is as follows: returning latent heat in a working medium evaporator 13 at 105-110 ℃ and then feeding the latent heat into a condensate separation tank 21; the micro-positive pressure flash steam quantity is as follows: 19.5 t/h-23.4 t/h; water in the micro-positive pressure flash steam is completely liquefied in the working medium evaporator 13; the gas phase at the top of the condensate separating tank 21 is discharged into an acid gas torch burner 20 for burning; and the liquid phase at the bottom of the condensate separating tank 21 is pressurized by a condensate pump 19 and is sent into a working medium preheater 18 for cooling, and the liquid phase returns to the clarifying tank 8 after being cooled to 65-75 ℃. The outlet pressure of the condensate pump 19 is as follows: 0.2 to 0.5 MPag. Step four: the organic working medium in the working medium evaporator 13 is heated and gasified by flash steam from the micro-positive pressure flash tank 5 and then enters the working medium expander 14 for expansion; the organic working medium is preferably isobutane, the temperature of the gas-phase working medium at the outlet of the working medium evaporator 13 is as follows: at 78-82 ℃, the pressure is as follows: 1.15 to 1.30 MPag. The outlet pressure of the working medium expander 14 is as follows: 0.5-0.6 MPag, temperature: 46-52 ℃; the working medium expander 14 outputs electric energy through the generator 15 as follows: 1200 kw-1500 kw. The organic working medium at the outlet of the working medium expander 14 enters a water cooler 16 for cooling and liquefaction, and enters a working medium preheater 18 through a working medium pump 17 after being liquefied; the water cooler 16 uses circulating water as a cold source, and an organic working medium at an outlet of the water cooler 16 is in a liquid phase; the outlet pressure of the working medium pump 17 is as follows: 1.2 to 1.4 MPag. Step five: the liquid phase at the bottom of the micro-positive pressure flash tank 5 enters a desalted water preheater 6, desalted water in the desalted water preheater 6 is heated, the desalted water is supplied by a desalted water supply pipeline 24, and the heated desalted water passes through a desalted water return pipeline 23; the supply water temperature of the desalted water is 20-30 ℃, and the temperature of the desalted water discharged from the desalted water preheater 6 is as follows: 95-102 ℃, and the flow rate is as follows: 95 to 115 t/h. Step six: the liquid phase after the desalted water is heated is subjected to reduced pressure flash evaporation in the vacuum flash tank 7, the flash steam at the top of the tank after the reduced pressure flash evaporation enters the vacuum flash evaporation tail gas treatment system 22, the liquid phase after the reduced pressure flash evaporation enters the clarifying tank 8, and the flash pressure of the vacuum flash tank 7 is as follows: -50KPag to-70 KPag. The vacuum flash evaporation tail gas treatment system 22 of the present invention can use the tail gas treatment system used in the existing vacuum flash evaporation tank 7. The utility model discloses add pressure-fired flash tank and desalted water pre-heater between low pressure flash distillation and vacuum flash distillation, can be effective thorough retrieves gasification black water heat, can effectively reduce vacuum flash distillation tail gas processing system's circulating water consumption and power consumption simultaneously. Through the device and the process, the micro-positive pressure flash steam can generate 1200-1500 kw of electricity, and the amount of the preheated desalted water is as follows: 95-115 t/h, and the vacuum flash steam amount is reduced by more than 95%.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. The utility model provides a device that coal industry gasification black water heat utilized in grades, includes gasification black water pipeline (1), its characterized in that: the gasification black water pipeline (1) is connected with the low-pressure flash tank (4) through a gasification grey water heating system, a liquid phase outlet of the low-pressure flash tank (4) is connected with the vacuum flash tank (7) through tube passes of the micro-positive pressure flash tank (5) and the desalted water preheater (6) in sequence, and a liquid phase outlet of the vacuum flash tank (7) is connected with the clarifying tank (8);
the top gas phase outlet of the micro-positive pressure flash tank (5) is connected with the flash evaporator energy utilization and recovery system.
2. The device for graded utilization of coal chemical industry gasification black water heat according to claim 1, characterized in that: the gasification grey water heating system comprises a hot evaporation water tower (2) and a shift stripping tower (10) connected with a gas phase outlet at the top of the hot evaporation water tower (2);
the evaporation hot water tower (2) comprises a lower tower (2-1) arranged at the bottom of the evaporation hot water tower (2) and an upper tower (2-2) arranged at the top of the lower tower (2-1), and a partition plate (2-4) with an air cap (2-3) is arranged between the lower tower (2-1) and the upper tower (2-2);
the middle part of the upper tower (2-2) is connected with a gasification grey water pipeline (9), and the middle part of the lower tower (2-1) is communicated with a gasification black water pipeline (1);
a pipeline connected with a hot water tank (11) is arranged on the evaporation hot water tower (2) at one side of the upper part of the clapboard (2-4);
the bottom liquid phase outlet of the lower tower (2-1) is connected with a low-pressure flash tank (4).
3. The device for graded utilization of coal chemical industry gasification black water heat according to claim 1, characterized in that: and a gas phase outlet of the low-pressure flash tank (4) is connected with the deaerator (12).
4. The device for graded utilization of coal chemical industry gasification black water heat according to claim 1, characterized in that: the shell side inlet of the desalted water preheater (6) is connected with a desalted water supply pipeline (24), and the shell side outlet of the desalted water preheater (6) is connected with a desalted water return pipeline (23).
5. The device for graded utilization of coal chemical industry gasification black water heat according to claim 1, characterized in that: and a vacuum flash evaporation tail gas treatment system (22) is arranged at the top of the vacuum flash tank (7).
6. The device for graded utilization of coal chemical industry gasification black water heat according to claim 1, characterized in that: the flash evaporator energy utilization and recovery system comprises a heat energy two-stage utilization unit and a heat energy power generation unit;
the heat energy two-stage utilization unit comprises a working medium evaporator (13) connected with a gas-phase outlet at the top of a micro-positive pressure flash tank (5), a liquid-phase outlet at the bottom of the working medium evaporator (13) is connected with a condensate knockout drum (21), a gas-phase outlet of the condensate knockout drum (21) is connected with an acid gas torch burner (20), a liquid-phase outlet at the bottom of the condensate knockout drum (21) is connected with a clarifying tank (8) through a condensate pump (19), a first inlet (25) of a working medium preheater (18), and a first outlet (26) of the working medium preheater (18).
7. The device for graded utilization of coal chemical industry gasification black water heat according to claim 6, characterized in that: the heat energy power generation unit comprises a working medium expander (14) with a power generator (15), an outlet of the working medium expander (14) is connected with a working medium inlet (29) of a working medium evaporator (13) sequentially through a water cooler (16), a working medium pump (17), a second inlet (27) of the working medium preheater (18) and a second outlet (28) of the working medium preheater (18), and a working medium outlet (3) of the working medium evaporator (13) is connected with an inlet of the working medium expander (14).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120555557.7U CN214693386U (en) | 2021-03-18 | 2021-03-18 | Device for graded utilization of coal chemical industry gasified black water heat |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120555557.7U CN214693386U (en) | 2021-03-18 | 2021-03-18 | Device for graded utilization of coal chemical industry gasified black water heat |
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| CN202120555557.7U Active CN214693386U (en) | 2021-03-18 | 2021-03-18 | Device for graded utilization of coal chemical industry gasified black water heat |
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