CN108795506B - Pulverized coal gasification flash evaporation condensation system and process - Google Patents
Pulverized coal gasification flash evaporation condensation system and process Download PDFInfo
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- CN108795506B CN108795506B CN201810608206.0A CN201810608206A CN108795506B CN 108795506 B CN108795506 B CN 108795506B CN 201810608206 A CN201810608206 A CN 201810608206A CN 108795506 B CN108795506 B CN 108795506B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
- B01D5/0012—Vertical tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/0093—Removing and treatment of non condensable gases
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/16—Integration of gasification processes with another plant or parts within the plant
- C10J2300/169—Integration of gasification processes with another plant or parts within the plant with water treatments
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention discloses a pulverized coal gasification flash evaporation condensing system and a process, wherein a vacuum flash tank, a vertical tube array condenser, a condensate tank, a condensate pump and a vacuum pump are sequentially connected behind an ash water pipe generating ash water through pulverized coal gasification washing, wherein a gas phase outlet of the vacuum flash tank is communicated with an inlet at the top of a tube array of the vertical tube array condenser, an outlet at the bottom of the tube array of the vertical tube array condenser is communicated with an inlet of the condensate tank, a liquid phase outlet of the condensate tank is connected with an inlet of the condensate pump, an outlet of the condensate pump is respectively connected with a pipeline for removing a settling tank and a pipeline for washing the top of the tube array of the vertical tube array condenser, a gas phase outlet of the condensate tank is connected with. The invention can effectively ensure the heat exchange effect of the flash evaporation condenser, improve the condensation quantity of flash evaporation steam, reduce the pressure and temperature of a flash evaporation system and meet the operation requirement of a grey water system.
Description
Technical Field
The invention relates to the field of coal chemical industry, in particular to a pulverized coal gasification flash evaporation condensation system and a process.
Background
The pulverized coal gasification is a technology for converting coal into synthesis gas and fuel gas through incomplete combustion, and is one of important ways for cleanly using pulverized coal. The pulverized coal gasification technology has the advantages of high combustion efficiency and high energy utilization rate, and the pulverized coal gasification technology gradually replaces the original lump coal combustion.
Generally, high-temperature and high-pressure synthesis gas generated after gasification of pulverized coal is subjected to a water chilling and washing process and then sent to a subsequent conversion process. During the water chilling and washing processes, the grey water with high solid content is generated at high temperature and high pressure, the grey water is subjected to step-by-step pressure reduction and flash evaporation, the grey water is concentrated while heat is recovered, and the grey water with high solid content is finally subjected to flocculation settling and solid-liquid separation for recycling.
The high-temperature and high-pressure grey water generated in the pulverized coal gasification process is depressurized and flashed in a flash tank, and the flash steam carries more liquid drops and is mixed with a large amount of pulverized coal. Conventional condensing equipment is a horizontal U-shaped tube heat exchanger, flash steam enters a tube space of the heat exchange equipment and is cooled by cooling water in the tube, generated condensate is mixed with non-condensable gas and enters a separator for gas-liquid separation, the non-condensable gas is pumped by a vacuum pump and then is discharged, and liquid is recovered as required.
In order to ensure the heat exchange effect, the gaps of the tubes of the conventional heat exchanger are small, and the liquid drops and the fly ash carried in the flash steam are easy to deposit among the tubes to form blockage through multiple times of baffling by the baffle plate, so that the heat exchange effect is reduced, a large amount of flash steam cannot be condensed to cause the pressure rise and the temperature rise of a system, and the subsequent sedimentation of the grey water is not facilitated.
Disclosure of Invention
In order to solve the defects of the prior art, one of the purposes of the invention is to provide a pulverized coal gasification flash evaporation condensing system which can effectively ensure the heat exchange effect, improve the condensation quantity of flash evaporation steam, reduce the pressure and temperature of the flash evaporation system and meet the operation requirement of a grey water system.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a fine coal gasification flash distillation condensing system, the real jar of dodging is connected gradually behind the grey water pipe that the grey water was produced in the washing of fine coal gasification, vertical shell and tube condenser, the condensate tank, the condensate pump, the vacuum pump, wherein, the gaseous phase export of real jar of dodging communicates with the shell and tube top import of vertical shell and tube condenser, the shell and tube bottom export and the condensate tank import intercommunication of vertical shell and tube condenser, the liquid phase exit linkage condensate pump import of condensate tank, the shell and tube top flushing line who goes vertical shell and tube condenser is connected to the condensate pump export, the export of the shell and tube top flushing line who goes vertical shell and tube condenser communicates with the shell and tube top import of vertical shell and tube condenser, the gaseous phase exit linkage vacuum pump import of condensate.
When the flash steam is high-temperature and high-pressure liquid material entering the low-pressure space, the gas-liquid equilibrium state is broken, part of liquid is rapidly gasified to become flash steam, and the sensible heat of the original liquid material is absorbed, so that the liquid is cooled. For cooling the flash steam, the flash steam and the liquid material have different properties and are difficult to flow from top to bottom through the tubes, so that the horizontal tube-tube heat exchanger is adopted in the traditional process. In the present invention, part of the condensate is re-delivered to the top inlet of the tubes of the vertical tube-in-tube condenser, which functions as: 1. mixing the condensate with flash steam to pre-cool the flash steam; 2. the directional flow of the condensate liquid drives the flash steam to flow, so that the flow of the flash steam in the vertical tubes is enhanced, meanwhile, the existing film-shaped condensation is changed into drop-shaped condensation due to the existence of the liquid drops, and the condensation effect of the flash steam is enhanced; 3. the fine coal is entrained in the flash steam, and part of the fine coal is adhered to the inner wall of the tube array in the flowing process of the flash steam in the tube array, so that the film resistance coefficient is increased, and the heat exchange effect is reduced. By adding the condensate, the condensate washes the inner wall of the tube array, the film resistance coefficient is reduced, and the heat exchange effect is improved.
The invention also aims to provide a fine coal gasification flash evaporation condensation process, which comprises a vacuum flash tank, a vertical tube array condenser, a condensate tank, a condensate pump and a vacuum pump, wherein gray water generated by fine coal gasification enters the vacuum flash tank, flash steam in the vacuum flash tank enters the vertical tube array condenser, the flash steam flows downwards after being condensed in tubes and then enters the condensate tank, and the condensate pump conveys part of condensate in the condensate tank to an inlet at the top of the tubes of the vertical tube array condenser. And a gas phase outlet at the top of the condensate tank is connected with a vacuum pump, and noncondensable gas which cannot be condensed in the flash steam is pumped out. The flash evaporation system is maintained in a negative pressure state, and the flash evaporation effect is improved.
The invention also aims to provide a pulverized coal gasification process, which adopts the condensing system or the condensing process to treat the grey water generated by pulverized coal gasification.
The invention has the beneficial effects that:
1. the system or the process provided by the invention adopts the vertical tube array condenser, and the condensed condensate is mixed with the flash steam and then the flash steam is cooled through the tube array, so that the pulverized coal carried by the flash steam is prevented from depositing on the inner wall of the tube array, and the heat exchange efficiency is effectively ensured.
2. The system or the process provided by the invention adopts the vertical tube-in-tube condenser, and adopts the condensate to pre-cool the flash steam, so that the condensation quantity of the flash steam can be greatly improved, and the pressure and the temperature of a flash system are reduced, thereby meeting the operation requirement of a grey water system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic diagram of the system of the present invention;
the system comprises a vacuum flash tank 1, a vertical tube array condenser 2, a condensate tank 3, a condensate pump 4, a vacuum pump 5, a settling tank removing pipeline 6 and a tube array top flushing pipeline removing device 7 of the vertical tube array condenser.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background art, the prior art has the defect that liquid drops carried in flash steam and fly ash are easy to deposit in a heat exchanger to form blockage, so that the heat exchange effect is reduced.
The utility model provides a typical embodiment, a fly coal gasification flash distillation condensing system is provided, the real jar of dodging is connected gradually behind the grey water pipe that the grey water was produced in the washing of fly coal gasification, vertical tubulation condenser, the condensate tank, the condensate pump, the vacuum pump, wherein, the gas phase export of real jar of dodging communicates with the tubulation top import of vertical tubulation condenser, the tubulation bottom export and the condensate tank import intercommunication of vertical tubulation condenser, the liquid phase exit linkage condensate pump import of condensate tank, the tubulation top flushing line that goes vertical tubulation condenser is connected to the condensate pump export, the export of the tubulation top flushing line that goes vertical tubulation condenser communicates with the tubulation top import of vertical tubulation condenser, the gas phase exit linkage vacuum pump import of condensate tank.
When the flash steam is high-temperature and high-pressure liquid material entering the low-pressure space, the gas-liquid equilibrium state is broken, part of liquid is rapidly gasified to become flash steam, and the sensible heat of the original liquid material is absorbed, so that the liquid is cooled. For cooling the flash steam, the flash steam and the liquid material have different properties and are difficult to flow from top to bottom through the tubes, so that the horizontal tube-tube heat exchanger is adopted in the traditional process. In the present invention, part of the condensate is re-delivered to the top inlet of the tubes of the vertical tube-in-tube condenser, which functions as: 1. mixing the condensate with flash steam to pre-cool the flash steam; 2. the directional flow of the condensate liquid drives the flash steam to flow, so that the flow of the flash steam in the vertical tubes is enhanced, meanwhile, the existing film-shaped condensation is changed into drop-shaped condensation due to the existence of the liquid drops, and the condensation effect of the flash steam is enhanced; 3. the fine coal is entrained in the flash steam, and part of the fine coal is adhered to the inner wall of the tube array in the flowing process of the flash steam in the tube array, so that the film resistance coefficient is increased, and the heat exchange effect is reduced. By adding the condensate, the condensate washes the inner wall of the tube array, the film resistance coefficient is reduced, and the heat exchange effect is improved.
Preferably, the inlet at the top of the tube array of the vertical tube array condenser is provided with a distributor. The device is used for dispersing the condensate, improving the mixing effect of the condensate and the flash steam and achieving the purpose of precooling; meanwhile, a large amount of fine condensed liquid drops are suspended in the flash steam, and the existence of the liquid drops breaks through a liquid film on the inner wall of the tube array, so that film-shaped condensation is changed into drop-shaped condensation, and the heat exchange efficiency is enhanced.
Preferably, the vertical tube array condenser tube array adopts a tube array with the diameter not less than phi 38 mm. The conventional pipe diameters of phi 19mm and phi 25mm are not selected, so that the wall-bonding phenomenon of the pulverized coal is reduced.
Preferably, the device comprises a settling tank, the outlet of the condensate pump is simultaneously connected with a pipeline for removing the settling tank and a flushing pipeline at the top of a tube array of the vertical tube array condenser, and the outlet of the pipeline for removing the settling tank is connected with the inlet of the settling tank.
Preferably, the outlet of the vacuum pump is connected to the discharge port.
The second embodiment of this application provides a fine coal gasification flash distillation condensation technology, provide real flash tank, vertical tubulation condenser, the condensate tank, the condensate pump, the vacuum pump, the buck that fine coal gasification produced gets into real flash tank, flash steam in the real flash tank gets into vertical tubulation condenser, flash steam gets into the condensate tank after the downward flow cooling after condensing in the tubulation, the condensate pump carries the tubulation top import to vertical tubulation condenser with partly condensate in the condensate tank, the top gas phase export and the vacuum pump connection of condensate tank, the noncondensable gas that can't condense in the flash steam is taken out. The flash evaporation system is maintained in a negative pressure state, and the flash evaporation effect is improved.
Preferably, a settling tank is provided and the condensate pump delivers another portion of the condensate in the condensate drum to the settling tank.
Preferably, the pressure in the vacuum flash tank is-0.05 to-0.01 MPa.
Preferably, the non-condensable gas in the vacuum pump condensate tank is exhausted and then emptied.
In a third embodiment of the present application, a pulverized coal gasification process is provided, in which the above-mentioned condensing system or condensing process is used to treat grey water generated by pulverized coal gasification.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
Example 1
The utility model provides a fine coal gasification flash distillation condensing system, as shown in figure 1, be used for carrying behind the grey water pipe that the fine coal gasification produced grey water connect gradually real flash tank 1, vertical tubulation condenser 2, condensate tank 3, condensate liquid pump 4, vacuum pump 5, wherein, the gaseous phase export of real flash tank 1 and the import of vertical tubulation condenser 2 communicate, the import of vertical tubulation condenser 2 and the import of condensate tank 3 communicate, the bottom export of condensate tank 3 and the import of condensate liquid pump 4 communicate, the exit linkage of condensate liquid pump 4 goes to subsider pipeline 6 and goes the tubulation top flushing line 7 of vertical tubulation condenser, the export of the tubulation top flushing line 7 of going vertical tubulation condenser communicates with the tubulation top import of vertical tubulation condenser 2, the top export of condensate tank 3 and vacuum pump 5 import intercommunication. The inlet at the top of the tube array of the vertical tube array condenser 2 is provided with a distributor.
The process comprises the following steps:
cooling water is respectively connected to an inlet pipe and an outlet pipe of a shell pass of the vertical tube array condenser, flash steam discharged by the vacuum flash tank exchanges heat and cools in tube arrays of the vertical tube array condenser to form condensate liquid which enters a condensate liquid tank, and then a part of the condensate liquid is delivered out by the condensate liquid pump, and the other part of the condensate liquid is delivered to an inlet at the top of the tube arrays of the vertical tube array condenser and is used for precooling the flash steam, flushing the tube arrays and generating a large amount of fine liquid drops; and discharging the non-condensable gas at the top of the condensate tank through a vacuum pump.
After improvement, the pressure of the real flash separation tank is reduced from 0.03MPa to-0.05 MPa, the temperature of the liquid discharged from the real flash tank is reduced from 108 ℃ to 80 ℃, and the operating conditions of the subsequent sedimentation process are greatly improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A pulverized coal gasification flash evaporation condensation method is characterized in that a vacuum flash tank, a vertical tube array condenser, a condensate tank, a condensate pump and a vacuum pump are sequentially connected behind an ash water pipe for generating ash water during pulverized coal gasification washing, wherein a gas phase outlet of the vacuum flash tank is communicated with an inlet at the top of a tube array of the vertical tube array condenser, an outlet at the bottom of the tube array of the vertical tube array condenser is communicated with an inlet of the condensate tank, a liquid phase outlet of the condensate tank is connected with an inlet of the condensate pump, an outlet of the condensate pump is connected with a tube array top flushing pipeline for removing the vertical tube array condenser, an outlet of the tube array top flushing pipeline for removing the vertical tube array condenser is communicated with an inlet at the top of the tube array of the vertical tube array condenser, and;
a distributor is arranged at an inlet at the top of the tube array of the vertical tube array condenser;
the grey water generated by pulverized coal gasification washing enters a vacuum flash tank, flash steam in the vacuum flash tank enters a vertical type tube array condenser, the flash steam flows downwards after being condensed in a tube array and then enters a condensate tank, the condensate tank conveys part of condensate in the condensate tank to an inlet at the top of the tube array of the vertical type tube array condenser, a top gas phase outlet of the condensate tank is connected with a vacuum pump, and noncondensable gas which cannot be condensed in the flash steam is pumped out.
2. A condensing method according to claim 1, characterized in that the vertical tube-in-tube condenser is a tube-in-tube having a diameter of not less than phi 38 mm.
3. A method of condensing according to claim 1 comprising a settler and wherein the condensate pump outlet is connected to both the dessettler line and the top of the tube train flush line of the vertical tube train condenser, the outlet of the dessettler line being connected to the inlet of the settler.
4. A method of condensing according to claim 1 wherein the outlet of the vacuum pump is connected to a drain.
5. A method of condensing according to claim 1 wherein a settling tank is provided and the condensate pump delivers another portion of the condensate in the condensate drum to the settling tank.
6. A condensing method according to claim 1, characterized in that the pressure in the vacuum flash tank is-0.05 to-0.01 MPa.
7. A condensing method according to claim 1, characterized in that the vacuum pump evacuates the non-condensable gases in the condensate tank.
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| CN201810608206.0A CN108795506B (en) | 2018-06-13 | 2018-06-13 | Pulverized coal gasification flash evaporation condensation system and process |
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| CN201810608206.0A CN108795506B (en) | 2018-06-13 | 2018-06-13 | Pulverized coal gasification flash evaporation condensation system and process |
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| CN110760341A (en) * | 2019-10-28 | 2020-02-07 | 山西晋城无烟煤矿业集团有限责任公司 | Entrained flow bed coal gasification flash evaporation non-condensable gas purification system and method thereof |
| CN115721951A (en) * | 2022-10-28 | 2023-03-03 | 新疆心连心能源化工有限公司 | Gasification tail gas treatment device and using method thereof |
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| CN201232032Y (en) * | 2008-05-01 | 2009-05-06 | 山西丰喜肥业（集团）股份有限公司临猗分公司 | Flash vaporization condensation separator for treating ash and water from staged gasifier |
| CN101885975A (en) * | 2010-07-08 | 2010-11-17 | 西北农林科技大学 | Device and process for bio-oil and carbon powder coproduction |
| CN202449945U (en) * | 2011-12-31 | 2012-09-26 | 罗丹雨 | Black water recovery system |
| CN203432412U (en) * | 2013-08-26 | 2014-02-12 | 上海金匙环保科技股份有限公司 | Condensing device with self-cleaning function |
| CN205578054U (en) * | 2016-04-29 | 2016-09-14 | 苟仲武 | Take generating function's steam boiler system |
| CN107560458A (en) * | 2017-08-23 | 2018-01-09 | 新乡市巨能合成材料有限公司 | A kind of shell and tube condenser |
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