Gasification water deamination and energy recovery device for crushed coal pressure gasification

By designing a gasification water ammonia removal and energy recovery device that includes multi-stage flash evaporation, condensation, and purification, the problem of ammonia and energy recovery during the pressurized gasification of pulverized coal was solved, achieving efficient ammonia recovery and energy reuse, reducing production costs and environmental pollution.

CN223674459UActive Publication Date: 2025-12-16HUBEI JINKONG GAS CO LTD
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Patent Information

Application Number
CN202423160636.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-12-16
Estimated Expiration
2034-12-20

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively recover ammonia and energy from the coal gas water during the pressurized gasification process of crushed coal, resulting in high wastewater treatment costs and substandard treatment.

Method used

A gasification water ammonia removal and energy recovery device is adopted, which includes components such as a medium-pressure flash evaporator, a vacuum flash evaporator, a cooler, a vacuum pump, a separator, a deacidification tower, a deammoniation tower, and a waste heat recovery device. The device recovers the heat of ammonia gas through a multi-stage flash evaporation, condensation, and purification process, and uses the waste heat recovery device to achieve energy reuse.

Benefits of technology

It effectively recovers ammonia from coal gas water, reduces power consumption, increases power generation, improves energy utilization efficiency, reduces production costs, reduces environmental pollution, and complies with environmental protection policies.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a gasified water deamination and energy recovery device for crushed coal pressure gasification. Comprising a medium-pressure flash evaporator, a vacuum flash evaporator, a cooler, a vacuum pump, a separator, a gasified water condensate tank, a deacidification tower, a deamination tower, a waste heat recoverer, a first-stage liquid separation tank, a second-stage condenser, a second-stage liquid separation tank, a third-stage condenser, a third-stage liquid separation tank, an ammonia gas purification tower, an alkali washing system and an ammonia absorption cooler which are connected in sequence. According to the device, an air cooler is changed into the waste heat recoverer, the waste heat recoverer is used for recovering ammonia gas heat, ammonia gas energy of the water flash evaporation section, the water vapor stripping section and the deamination tower is efficiently recycled, power consumption of the air cooler is reduced, generated low-pressure steam can be fed into the power generator for power generation, cost is reduced, efficiency is improved, and higher value is created. The ammonia recovery device can effectively recover ammonia, and meanwhile, energy generated by the device is recovered for waste heat utilization.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal briquetting pressure gasification, and particularly relates to a gasification water ammonia removal and energy recovery device for coal briquetting pressure gasification. BACKGROUND

[0002] The crude coal gas generated by coal briquetting pressure gasification contains a large amount of water vapor, dust, and carbonized byproducts such as tar, light oil, naphthalene, phenol, fatty acid, dissolved gas, and inorganic salt, and has a high temperature. Therefore, it is necessary to cool and wash the crude coal gas to reduce the temperature and remove harmful substances in the crude coal gas. During the washing and cooling of the crude coal gas, these impurities enter the water to form coal gas water with multiple components in gas, liquid, and solid states. The composition of the coal gas water is relatively complex. The oil, dust, phenol, ammonia, and other substances in the coal gas water cannot be directly treated by conventional biochemical, filtration, reverse osmosis, and other methods. The valuable substances in the wastewater must be separated and recovered, on the one hand, to generate certain economic benefits, and on the other hand, to enable the wastewater to meet the water inlet requirements of general wastewater treatment methods and be discharged after biochemical treatment to meet the discharge standard. In order to better recover ammonia and energy, the utility model provides a gasification water ammonia removal and energy recovery device for coal briquetting pressure gasification. SUMMARY

[0003] Based on the above description, the utility model provides a gasification water ammonia removal and energy recovery device for coal briquetting pressure gasification, which can remove ammonia and has a waste heat recovery device to recover heat.

[0004] The utility model solves the technical problems by adopting the following technical scheme:

[0005] A gasification water ammonia removal and energy recovery device for coal briquetting pressure gasification includes a medium-pressure flash evaporator, a vacuum flash evaporator, a cooler, a vacuum pump, a separator, a gasification water condensate tank, a deacidification tower, a deamination tower, a waste heat recovery device, a primary liquid separation tank, a secondary condenser, a secondary liquid separation tank, a tertiary condenser, a tertiary liquid separation tank, an ammonia gas purification tower, an alkali washing system, and an ammonia absorption cooler connected in sequence.

[0006] Further, the gasification water ammonia removal and energy recovery device for coal briquetting pressure gasification has a medium-pressure flash evaporator bottom outlet connected to a vacuum flash evaporator middle inlet, a vacuum flash evaporator middle outlet connected to a cooler inlet, a cooler outlet connected to a vacuum pump inlet, a vacuum pump outlet connected to a separator middle inlet, a separator bottom outlet connected to a gasification water condensate tank top inlet, and a gasification water condensate tank bottom outlet connected to a deacidification tower upper inlet.

[0007] Further, the gasification water deaminization and energy recovery device for the pressurized gasification of crushed coal, the bottom outlet of the deacidification tower is connected with the upper inlet of the deamination tower, the top outlet of the deamination tower is connected with the upper inlet of the waste heat recovery device, the top outlet of the waste heat recovery device is connected with the top inlet of the first-stage liquid separator, the upper outlet of the first-stage liquid separator is connected with the inlet of the second-stage condenser, the outlet of the second-stage condenser is connected with the inlet of the second-stage liquid separator, the outlet of the second-stage liquid separator is connected with the inlet of the third-stage condenser, the outlet of the third-stage condenser is connected with the upper inlet of the third-stage liquid separator, and the middle outlet of the third-stage liquid separator is connected with the upper inlet of the ammonia gas purification tower.

[0008] Further, the gasification water deaminization and energy recovery device for the pressurized gasification of crushed coal, the middle outlet of the ammonia gas purification tower is connected with the lower inlet of the caustic washing system, and the middle outlet of the caustic washing system is connected with the ammonia absorption cooler.

[0009] Further, the gasification water deaminization and energy recovery device for the pressurized gasification of crushed coal, the bottom outlet of the vacuum flasher is connected with the top inlet of the clarifying tank, and the upper outlet of the clarifying tank is connected with the upper inlet of the gasification water buffer tank.

[0010] Further, the gasification water deaminization and energy recovery device for the pressurized gasification of crushed coal, a gasification water condensate pump is connected between the gasification water condensate tank and the deacidification tower.

[0011] Further, the gasification water deaminization and energy recovery device for the pressurized gasification of crushed coal, a deacidification tower kettle pump is connected between the deacidification tower and the deamination tower.

[0012] Further, the gasification water deaminization and energy recovery device for the pressurized gasification of crushed coal, the waste heat recovery device comprises a shell, a heat exchange pipe bundle, a cooling medium, an insulation layer and a separation layer, the shell is provided with an ammonia vapor inlet, a steam outlet, a cooling medium inlet and an ammonia vapor outlet, the insulation layer is connected to the outside of the shell, the separation layer is connected to the inside of the shell and is used for isolating different media, and the heat exchange pipe bundle is filled with the cooling medium.

[0013] Further, the gasification water deaminization and energy recovery device for the pressurized gasification of crushed coal, the gasification water buffer tank is connected with a wastewater treatment device.

[0014] Compared with the prior art, the device can effectively recover ammonia in coal gasification water and simultaneously recover energy generated by the device for waste heat utilization. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole structure schematic view of the coal crushing pressurized gasification gasification water deaminization and energy recovery device of the utility model.

[0016] Figure 2 It is a partial section structure schematic view of the waste heat recovery device of the utility model.

[0017] In the figure, 1 is a medium pressure flash evaporator, 2 is a vacuum flash evaporator, 3 is a cooler, 4 is a vacuum pump, 5 is a separator, 6 is a gasification water condensate tank, 7 is a deacidification tower, 8 is a deaminization tower, 9 is a waste heat recovery device, 91 is an outer shell, 92 is a heat exchange tube bundle, 93 is an ammonia steam inlet, 94 is a steam outlet, 95 is a cooling medium inlet, 96 is an ammonia steam outlet, 10 is a first stage liquid separation tank, 11 is a second stage condenser, 12 is a second stage liquid separation tank, 13 is a third stage condenser, 14 is a third stage liquid separation tank, 15 is an ammonia gas purification tower, 16 is an alkali washing system, 17 is an ammonia absorption cooler, 18 is a clarifying tank, 19 is a gasification water buffer tank, 20 is a gasification water condensate pump, and 21 is a deacidification tower kettle pump. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The drawings show embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0020] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should also be understood that the term "comprising" or "including" or "having" etc. specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0021] Example 1

[0022] The application discloses a gasification water deaminating and energy recovering device for coal pressure gasification, which comprises a medium-pressure flash evaporator 1, a vacuum flash evaporator 2, a cooler 3, a vacuum pump 4, a separator 5, a gasification water condensate tank 6, a deacidification tower 7, a deaminating tower 8, a waste heat recovering device 9, a primary liquid separator 10, a secondary condenser 11, a secondary liquid separator 12, a tertiary condenser 13, a tertiary liquid separator 14, an ammonia gas purifying tower 15, an alkali washing system 16 and an ammonia absorbing cooler 17 which are sequentially connected.

[0023] The bottom outlet of the medium-pressure flash evaporator 1 is connected with the middle inlet of the vacuum flash evaporator 2, the middle outlet of the vacuum flash evaporator 2 is connected with the inlet of the cooler 3, the outlet of the cooler 3 is connected with the inlet of the vacuum pump 4, the outlet of the vacuum pump 4 is connected with the middle inlet of the separator 5, the bottom outlet of the separator 5 is connected with the top inlet of the gasification water condensate tank 6, and the bottom outlet of the gasification water condensate tank 6 is connected with the upper inlet of the deacidification tower 7.

[0024] The bottom outlet of the deacidification tower 7 is connected with the upper inlet of the deaminating tower 8, the top outlet of the deaminating tower 8 is connected with the upper inlet of the waste heat recovering device 9, the top outlet of the waste heat recovering device 9 is connected with the top inlet of the primary liquid separator 10, the upper outlet of the primary liquid separator 10 is connected with the inlet of the secondary condenser 11, the outlet of the secondary condenser 11 is connected with the inlet of the secondary liquid separator 12, the outlet of the secondary liquid separator 12 is connected with the inlet of the tertiary condenser 13, the outlet of the tertiary condenser 13 is connected with the upper inlet of the tertiary liquid separator 14, and the middle outlet of the tertiary liquid separator 14 is connected with the upper inlet of the ammonia gas purifying tower 15.

[0025] The middle outlet of the ammonia gas purifying tower 15 is connected with the lower inlet of the alkali washing system 16, and the middle outlet of the alkali washing system 16 is connected with the ammonia absorbing cooler 17.

[0026] In the embodiment, in order to facilitate the separation of water and oil from the coal gas after flash evaporation, the bottom outlet of the vacuum flash evaporator 2 is connected with the top inlet of a clarifying tank 18, and the upper outlet of the clarifying tank 18 is connected with the upper inlet of a gasification water buffer tank 19.

[0027] The device is suitable for anthracite, ammonia in waste water is recovered through flash evaporation and water vapor extraction, dilute ammonia water is prepared, heat generated by the deaminating tower is recovered, waste heat is recovered, and energy efficiency is improved.

[0028] In the embodiment, in order to provide power, a gasification water condensate pump 20 is connected between the gasification water condensate tank 6 and the deacidification tower 7.

[0029] In the embodiment, in order to provide power, a deacidification tower kettle pump 21 is connected between the deacidification tower 7 and the deaminating tower 8.

[0030] In the present embodiment, the waste heat recovery device 9 is further described, which comprises a shell 91, a heat exchange tube bundle 92, a cooling medium, an insulation layer, and an isolation layer. The shell 91 is provided with an ammonia vapor inlet 93, a steam outlet 94, a cooling medium inlet 95, and an ammonia vapor outlet 96. The insulation layer is connected to the outside of the shell 91, and the isolation layer is connected to the inside of the shell 91 for isolating different media. The heat exchange tube bundle 92 is filled with the cooling medium.

[0031] The coal gasification water after pressurized gasification of the anthracite is introduced into the medium pressure flasher 1 and the vacuum flasher 2, and the CO2, H2S, NH3 and other gases are evaporated. The waste water containing dust and other impurities at the bottom after the flash is introduced into the clarifier 18, and the precipitates are removed. The clarified waste water at the upper part is introduced into the gasification water buffer tank 19 and then into the waste water treatment device for treatment. The ammonia-containing flash liquid after the flash is introduced into the cooler, the separator and the like, and then into the deacidification tower 7 for deacidification. The deacidification tower 7 uses the flash steam from the gasification water flash unit as a heat source to strip and remove the CO2, H2S and other acidic gases in the ammonia-containing waste water from the top of the tower. The ammonia-containing gasification water from the deacidification tower 7 is pressurized by the deacidification tower kettle pump 21 and introduced into the upper part of the deamination tower 8 (C-624002). The ammonia vapor collected from the top is cooled to about 128°C by the waste heat recovery device 9 (E-624003), and then introduced into the first-stage separation tank 10 (T-624002) for gas-liquid separation. The gaseous ammonia is sent out from the upper part, cooled to about 86°C by the second-stage condenser 11 (E-624004), and then introduced into the second-stage separation tank 12 (T-624003). The crude ammonia gas from the second-stage separation tank 12 is cooled to 40-45°C by heat exchange with the cooling water of the third-stage condenser 13 (E-624005), and then introduced into the third-stage separation tank 14 (T-624004). The crude ammonia gas from the third-stage separation tank 14 is introduced into the ammonia gas purification tower 15 for purification. Then, the purified ammonia gas is introduced into the ammonia absorption cooler 17 (E-624011) to be absorbed into about 20wt% dilute ammonia water.

[0032] The waste heat recovery device 9 can meet the process requirements to reduce the ammonia gas to the process required temperature, and the waste heat recovery device 9 can convert the heat energy originally wasted by the air cooler into usable steam energy, realizing the reuse of energy. These recovered steam energy is used for producing low-pressure steam power generation, thereby improving the energy utilization efficiency. The operation cost of the waste heat recovery device 9 is relatively low, and once installed and put into use, the waste heat can be continuously recovered and utilized, thereby saving the energy cost for the enterprise. In addition, the waste heat recovery device can also improve the production efficiency, improve the stability and controllability of the process, reduce the influence of temperature fluctuation in production on the process, and improve the operation efficiency of the production line. These all help to reduce the cost and improve the economic benefit. The waste heat recovery device has no pollutant emission in the whole process, meeting the requirements of the environmental protection policy. Through the recovery and utilization of waste heat, the combustion of fossil fuels and the emission of greenhouse gases are reduced, which helps to alleviate the pressure on the environment and achieve the green production goal.

[0033] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for deammoniation and energy recovery of gasification water from pressurized coal gasification, characterized in that, The system comprises a medium-pressure flash evaporator (1), a vacuum flash evaporator (2), a cooler (3), a vacuum pump (4), a separator (5), a gasification water condensate tank (6), a deacidification tower (7), a deamination tower (8), a waste heat recovery device (9), a primary separator (10), a secondary condenser (11), a secondary separator (12), a tertiary condenser (13), a tertiary separator (14), an ammonia gas purification tower (15), an alkali washing system (16), and an ammonia absorption cooler (17).

2. The apparatus for gasification water deaminization and energy recovery in a pressurized coal gasification according to claim 1, wherein The bottom outlet of the medium-pressure flash evaporator (1) is connected to the middle inlet of the vacuum flash evaporator (2), the middle outlet of the vacuum flash evaporator (2) is connected to the inlet of the cooler (3), the outlet of the cooler (3) is connected to the inlet of the vacuum pump (4), the outlet of the vacuum pump (4) is connected to the middle inlet of the separator (5), the bottom outlet of the separator (5) is connected to the top inlet of the gasification water condensate tank (6), and the bottom outlet of the gasification water condensate tank (6) is connected to the upper inlet of the deacidification tower (7).

3. The apparatus for gasification water deaminization and energy recovery in a pressurized coal gasification according to claim 1, wherein The bottom outlet of the deacidification tower (7) is connected to the upper inlet of the deamination tower (8), the top outlet of the deamination tower (8) is connected to the upper inlet of the waste heat recovery device (9), the top outlet of the waste heat recovery device (9) is connected to the top inlet of the primary separator (10), the upper outlet of the primary separator (10) is connected to the inlet of the secondary condenser (11), the outlet of the secondary condenser (11) is connected to the inlet of the secondary separator (12), the outlet of the secondary separator (12) is connected to the inlet of the tertiary condenser (13), the outlet of the tertiary condenser (13) is connected to the upper inlet of the tertiary separator (14), and the middle outlet of the tertiary separator (14) is connected to the upper inlet of the ammonia gas purification tower (15).

4. The apparatus for gasification water deaminization and energy recovery in a pressurized coal gasification according to claim 1, wherein The middle outlet of the ammonia gas purification tower (15) is connected to the lower inlet of the alkali washing system (16), and the middle outlet of the alkali washing system (16) is connected to the ammonia absorption cooler (17).

5. The apparatus for gasification water deaminization and energy recovery in a pressurized coal gasification according to claim 1, wherein The bottom outlet of the vacuum flash evaporator (2) is connected to the top inlet of the clarifying tank (18), and the upper outlet of the clarifying tank (18) is connected to the upper inlet of the gasification water buffer tank (19).

6. The apparatus for gasification water deaminization and energy recovery in a pressurized coal gasification according to claim 1, wherein A gasification water condensate pump (20) is connected between the gasification water condensate tank (6) and the deacidification tower (7).

7. The apparatus for gasification water deaminization and energy recovery in a pressurized coal gasification according to claim 1, wherein A deacidification tower kettle pump (21) is connected between the deacidification tower (7) and the deamination tower (8).

8. The apparatus for gasification water deaminization and energy recovery in a pressurized coal gasification according to claim 1, wherein The waste heat recovery device (9) comprises a shell (91), a heat exchange tube bundle (92), a cooling medium, an insulation layer, and an isolation layer. The shell (91) is provided with an ammonia vapor inlet (93), a steam outlet (94), a cooling medium inlet (95), and an ammonia vapor outlet (96). The insulation layer is connected to the outside of the shell (91), and the isolation layer is connected to the inside of the shell (91) to isolate different media. The heat exchange tube bundle (92) is filled with a cooling medium.