CN215559637U - Black water treatment system - Google Patents
Black water treatment system Download PDFInfo
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- CN215559637U CN215559637U CN202120616950.2U CN202120616950U CN215559637U CN 215559637 U CN215559637 U CN 215559637U CN 202120616950 U CN202120616950 U CN 202120616950U CN 215559637 U CN215559637 U CN 215559637U
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Abstract
The utility model provides a black water treatment system which comprises a first evaporation hot water tower, a second evaporation hot water tower and a vacuum flash tank, wherein the first evaporation hot water tower is connected with the second evaporation hot water tower; a black water inlet is formed in one side of the first evaporation hot water tower, the top of the first evaporation hot water tower is connected with the first gas-liquid separation device, and the tower kettle of the first evaporation hot water tower is connected with the second evaporation hot water tower; the top of the second evaporation hot water tower is connected with a second gas-liquid separation device, and the tower kettle of the second evaporation hot water tower is connected with a vacuum flash tank; the top of the vacuum flash tank is connected with a third gas-liquid separation device, and the bottom of the vacuum flash tank is connected with a clarification device; the first outlets of the first gas-liquid separation device, the second gas-liquid separation device and the third gas-liquid separation device are connected with a storage container; the first grey water outlet of the storage container or the clear liquid outlet of the clarifying device are respectively and independently connected with the second evaporation hot water tower; the grey water outlet of the second evaporation hot water tower is connected with the first evaporation hot water tower. The utility model can improve the water-gas ratio of the synthesis gas and recover the heat of the flash steam of the evaporation hot water tower.
Description
Technical Field
The utility model relates to a black water treatment system.
Background
The entrained-flow bed gasification process has the characteristics of high gasification temperature, wide raw material application range, large operation load, high carbon conversion rate and the like, is widely applied in recent years, and is a preferred process for large-scale gasification. The entrained flow gasification process of the carbon-containing raw materials (coal, petroleum coke and heavy oil) mainly comprises three parts of entrained flow gasification, synthesis gas primary purification and black water treatment system.
Wherein, in the entrained-flow gasification, a carbon-containing raw material and a gasification agent (air, oxygen-enriched air or oxygen) react in an entrained-flow gasification furnace under the participation of steam or water to generate crude synthesis gas (the main components are CO and H) containing solid particles2And CO2Etc.) at temperatures of typically 1200 to 1600 ℃. In order to meet the requirements of downstream CO conversion devices, solid particles in the raw synthesis gas need to be removed, and the dust content of the synthesis gas of a gasification device, a synthesis gas primary purification unit and a synthesis gas washing tower is generally determined to be less than 1mg/Nm3For this reason, a large amount of water is required to wash the synthesis gas, and especially when the raw material of the gasification apparatus is a carbonaceous material with a high ash content, the amount of synthesis gas washing water required is very large. The water after the synthesis gas is washed generally contains a large amount of ash, has high solid content and is called black water, and the entrained-flow gasification process can generate a large amount of black water with high temperature (generally 200-250 ℃). Because the black water needs to be treated before returning to the syngas treatment unit for reuse, how to improve the black water treatmentThe energy utilization efficiency, the heat recovery of the high-temperature black water and the reduction of the energy consumption in the process are very important problems.
The three-stage flash black water treatment system of patent CN101298569A can generate a large amount of low-pressure flash steam, and needs to consume a large amount of circulating water for cooling. Specifically, the black water treatment system consists of a three-stage flash evaporation system of an evaporation hot water tower, a low-pressure flash evaporation tank and a vacuum flash evaporation tank. In the treatment process, high-temperature black water from the bottom of a chilling chamber, a cyclone separator and a washing tower of the gasification furnace is sent to an evaporation hot water tower for flash evaporation and directly contacts with circulating grey water for heat exchange, meanwhile, part of acid gas is resolved, the concentrated black water at the bottom is further concentrated by low-pressure and vacuum flash evaporation, fine slag is separated out by a clarifying tank, the clarifying grey water is further recycled, and part of the grey water is discharged as waste water. The energy utilization in the method is not sufficient, and the temperature of the grey water discharged from the evaporation hot water tower is still 140-170 ℃.
In addition, when the recycled high-temperature grey water is used as the washing water, if the temperature of the washing water is relatively low, the temperature of the synthesis gas discharged from the washing tower is relatively low, and the water-gas ratio of the synthesis gas is relatively low, so that the requirement of a subsequent CO conversion device cannot be met.
Therefore, under the global development requirements of low carbon and environmental protection, the necessary choice for the development of the gasification process is to reduce the energy consumption and water consumption of the gasification process of the carbon-containing raw material and improve the energy efficiency of the system. It is imperative to develop a black water treatment system that matches the temperature of the high temperature grey water circulating back to the scrubber to the syngas-to-water ratio requirements of the downstream CO shift unit, while reducing the consumption of the required circulating cooling water and increasing the energy utilization.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a black water treatment system in order to solve the problems that the temperature of high-temperature grey water of a circulating return washing tower of the black water treatment system in the prior art is not matched with the requirement of a downstream CO conversion device on the water-gas ratio of synthetic gas, the cooling circulating water amount required by flash evaporation gas is large, the energy consumption is high and the like.
The utility model solves the technical problems through the following technical scheme:
the utility model provides a black water treatment system, which comprises a first evaporation hot water tower, a second evaporation hot water tower and a vacuum flash tank, wherein the first evaporation hot water tower is connected with the second evaporation hot water tower;
a black water inlet is formed in one side of the first evaporation hot water tower, a tower top steam outlet of the first evaporation hot water tower is connected with the first gas-liquid separation device, and a tower bottom liquid outlet of the first evaporation hot water tower is connected with the second evaporation hot water tower; the tower top steam outlet of the second evaporation hot water tower is connected with a second gas-liquid separation device, and the tower bottom liquid outlet of the second evaporation hot water tower is connected with the vacuum flash tank; a top steam outlet of the vacuum flash tank is connected with a third gas-liquid separation device, and a bottom liquid outlet of the vacuum flash tank is connected with a clarification device;
the first outlets of the first gas-liquid separation device, the second gas-liquid separation device and the third gas-liquid separation device are connected with a storage container;
the first grey water outlet of the storage container or the clear liquid outlet of the clarifying device are respectively and independently connected with the second evaporation hot water tower; and the grey water outlet of the second evaporation hot water tower is connected with the first evaporation hot water tower.
And the first grey water outlet of the storage container or the clarified liquid outlet of the clarifying device are respectively and independently connected with the second evaporation hot water tower, so that the grey water generated by the first evaporation hot water tower, the second evaporation hot water tower and the vacuum flash tank is guided back to the second evaporation hot water tower for preheating.
And connecting the grey water outlet of the second evaporation hot water tower with the first evaporation hot water tower, so as to lead the grey water which flows back to the second evaporation hot water tower into the first evaporation hot water tower for further heating after primary heat exchange.
In the utility model, preferably, the top of the second evaporation hot water tower is also provided with a low-pressure deoxygenated water inlet and/or a desalted water inlet. The low-pressure deoxygenated water inlet and/or the desalted water inlet are respectively connected with a pipeline for transporting low-pressure deoxygenated water or desalted water and are used for guiding the low-pressure deoxygenated water and/or the desalted water into the second evaporation hot water tower.
And adding deoxygenated water and/or desalted water into the second hot evaporation water tower, so that the flash gas of the second hot evaporation water tower can be fully utilized.
In the present invention, the slurry outlet of the clarification device is preferably connected to a downstream processing device.
In the present invention, preferably, the grey water outlet of the first evaporation hot water tower is connected to the syngas scrubbing unit.
In the present invention, preferably, the second outlet of the first gas-liquid separation device and the second outlet of the second gas-liquid separation device are each independently connected to a torch.
In the present invention, preferably, the second outlet of the third gas-liquid separation device is connected to a vacuum extractor.
In the present invention, the first gas-liquid separating device, the second gas-liquid separating device and the third gas-liquid separating device may each independently be conventional in the art. Preferably, the first gas-liquid separating device, the second gas-liquid separating device, and the third gas-liquid separating device are each independently a separation tank.
In the present invention, it is preferable that cooling devices are independently provided on a pipe connecting the overhead vapor outlet of the first evaporation hot water tower and the first gas-liquid separation device, on a pipe connecting the overhead vapor outlet of the second evaporation hot water tower and the second gas-liquid separation device, and on a pipe connecting the overhead vapor outlet of the vacuum flash tank and the third gas-liquid separation device, respectively.
In the present invention, it is preferable that a cooling device is provided at the second grey water outlet of the storage container. The cooling device is used for cooling 10-30% of grey water and then discharging the grey water as waste water.
In the present invention, the cooling device may be a device for reducing temperature, which is conventional in the art. Preferably, the cooling device is a heat exchanger.
In the present invention, it is preferable that pumps are independently provided at the slurry outlet of the clarifier, at the pipe connecting the first grey water outlet of the storage tank and the second evaporation hot water tower, at the pipe connecting the grey water outlet of the second evaporation hot water tower and the first evaporation hot water tower, and at the grey water outlet of the first evaporation hot water tower, respectively.
In the present invention, the storage container may be a container for storing a substance, which is conventional in the art. Preferably, the storage container is a tank.
In the present invention, the clarification device may be a device for removing suspended substances and colloids from water, which is conventional in the art. Preferably, the clarification device is a clarification tank.
In the utility model, the number of the evaporation hot water towers is preferably 2-3.
In the utility model, the number of the vacuum flash tanks is preferably 1-2.
The positive progress effects of the utility model are as follows:
the separation equipment connected in series is arranged in the black water treatment unit, the grey water obtained by separation can flow reversely step by step in the evaporation hot water tower to realize temperature rise of the grey water, and when the grey water in the storage container flows back to the second evaporation hot water tower, flash steam in the tower preheats the grey water; the grey water enters a first evaporation hot water tower again, and flash steam in the tower carries out secondary heating on the grey water; this facilitates recovery of the heat of the flash steam from the hot water evaporation tower. Further, the water-to-gas ratio of the syngas (i.e., the volume ratio of water vapor to dry gas in the syngas) in the gasifier boundary zone can be increased as the grey water from the first evaporative hot water tower is returned to the upstream scrubber, facilitating operation of the CO shift unit.
Drawings
FIG. 1 is a schematic flow chart of a black water treatment system according to embodiment 1 of the present invention;
reference numerals:
1-a first evaporation hot water tower; 11-overhead vapor outlet; 12-tower bottoms outlet; 13-grey water outlet; 14-black water inlet;
2-a second evaporation hot water tower; 21-overhead vapor outlet; 22-tower bottoms outlet; 23-grey water outlet; 24-a low pressure deoxygenated water inlet;
3-vacuum flash tank; 31-top steam outlet; 32-a bottoms liquid outlet;
4-a clarification tank; 41-clear liquid outlet; 42-a slurry outlet;
5-ash water tank; 51-a first grey water outlet; 52-a second grey water outlet;
6-a separation tank;
61-a first gas-liquid separation tank; 611 — a first outlet; 612-a second outlet;
62-a second knock out pot; 621-a first outlet; 622 — second outlet;
63-a third knock out drum; 631 — a first outlet; 632-a second outlet;
7-a heat exchanger; 71-a first heat exchanger; 72-a second heat exchanger; 73-a third heat exchanger; 74-a fourth heat exchanger;
8-a pump; 81-a first pump; 82-a first pump; 83-a third pump; 84-fourth pump.
Detailed Description
The present invention will be more clearly and completely described in the following description of preferred embodiments, taken in conjunction with the accompanying drawings.
Example 1
This example 1 provides a black water treatment system, and a schematic flow chart of the black water treatment system is shown in fig. 1.
The black water treatment system comprises a first evaporation hot water tower 1, a second evaporation hot water tower 2 and a vacuum flash tank 3; one side of the first evaporation hot water tower 1 is provided with a black water inlet 14, and the black water inlet 14 is connected with a black water transportation pipeline and used for guiding black water; the tower top steam outlet 11 of the first evaporation hot water tower 1 is connected with the first gas-liquid separation tank 61, and the tower bottom liquid outlet 12 of the first evaporation hot water tower 1 is connected with the second evaporation hot water tower 2; the tower top steam outlet 21 of the second evaporation hot water tower 2 is connected with the second gas-liquid separation tank 62, and the tower bottom liquid outlet 22 of the second evaporation hot water tower 2 is connected with the vacuum flash tank 3; the top steam outlet 31 of the vacuum flash tank 3 is connected with the third gas-liquid separation tank 63, and the bottom liquid outlet 32 of the vacuum flash tank 3 is connected with the clarification tank 4; the first outlets of the first gas-liquid separation tank 61, the second gas-liquid separation tank 62 and the third gas-liquid separation tank 63 are all connected with the grey water tank 5, the second outlet 612 of the first gas-liquid separation tank 61 and the second outlet 622 of the second gas-liquid separation tank 62 are respectively and independently connected with a torch, and the second outlet 632 of the third gas-liquid separation tank 63 is connected with a vacuum extractor. A clear liquor outlet 41 of the clarification tank 4 is connected with the grey water tank 5 and is used for guiding the grey water with relatively low solid content in the clarification tank 4 into the grey water tank 5 so as to recycle the grey water after flash evaporation as much as possible; the first grey water outlet 51 of the grey water tank 5 is connected with the second evaporation hot water tower 2; the grey water outlet 23 of the second water column 2 is connected to the first water column 1. The first grey water outlet 51 of the grey water tank 5 is connected to the second hot water evaporation tower 2 in order to guide the grey water generated by the first hot water evaporation tower 1, the second hot water evaporation tower 2 and the vacuum flash tank 3 back to the second hot water evaporation tower 2 for preheating. The grey water outlet 23 of the second hot water evaporation tower 2 is connected with the first hot water evaporation tower 1, so that the grey water flowing back to the second hot water evaporation tower 2 is subjected to primary heat exchange and then is guided into the first hot water evaporation tower 1 for further heating. The grey water outlet 13 of the first evaporation hot water tower 1 is connected to the syngas scrubbing unit for directing grey water to an upstream syngas scrubber for reuse.
The tower top of the second evaporation hot water tower 2 is also connected with a low-pressure deoxygenated water inlet 24 of a low-pressure deoxygenated water transportation pipeline; the low-pressure deoxygenated water is added into the second evaporation hot water tower 2, which is favorable for fully utilizing flash steam of the second evaporation hot water tower 2. The sludge outlet 42 of the clarifier 4 is connected to downstream processing equipment for discharging settled sludge.
Heat exchangers are arranged on a pipeline connecting the top steam outlet 11 of the first evaporation hot water tower 1 with the first gas-liquid separation tank 61, a pipeline connecting the top steam outlet 21 of the second evaporation hot water tower 2 with the second gas-liquid separation tank 62, a pipeline connecting the top steam outlet 31 of the vacuum flash tank 3 with the third gas-liquid separation tank 63 and a second ash water outlet 52 of the ash water tank 5. The heat exchanger is disposed at the second grey water outlet 52 of the grey water tank 5 to cool 10-30% of grey water, and then the cooled grey water is discharged as waste water.
Pumps are arranged on the slurry outlet 42 of the clarifier 4, on the pipeline connecting the first grey water outlet 51 of the grey water tank 5 with the second evaporation hot water tower 2, on the pipeline connecting the grey water outlet 23 of the second evaporation hot water tower 2 with the first evaporation hot water tower 1 and on the grey water outlet 13 of the first evaporation hot water tower 1. The pump is provided to provide dynamic pressure to smoothly transport fluid in the pipe.
According to the utility model, the separation equipment connected in series is arranged in the black water treatment system, so that black water is evaporated to obtain grey water, and then the grey water flows reversely and sequentially enters the second evaporation hot water tower 2 and the first evaporation hot water tower 1, so that the temperature of the grey water is gradually increased, the water-gas ratio of the synthesis gas in a gasification device interface area is further improved, and the operation of a downstream conversion unit is facilitated; recovering the heat of the flash steam of the evaporation hot water tower.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120616950.2U CN215559637U (en) | 2021-03-26 | 2021-03-26 | Black water treatment system |
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| CN202120616950.2U CN215559637U (en) | 2021-03-26 | 2021-03-26 | Black water treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115124176A (en) * | 2021-03-26 | 2022-09-30 | 华东理工大学 | Black water treatment method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115124176A (en) * | 2021-03-26 | 2022-09-30 | 华东理工大学 | Black water treatment method |
| CN115124176B (en) * | 2021-03-26 | 2025-03-04 | 华东理工大学 | Black water treatment method |
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