CN216737947U - Coal gasification black water waste heat recovery system and switchable black water waste heat recovery system - Google Patents
Coal gasification black water waste heat recovery system and switchable black water waste heat recovery system Download PDFInfo
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- CN216737947U CN216737947U CN202220321824.9U CN202220321824U CN216737947U CN 216737947 U CN216737947 U CN 216737947U CN 202220321824 U CN202220321824 U CN 202220321824U CN 216737947 U CN216737947 U CN 216737947U
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Abstract
The utility model relates to coal chemical industry waste heat recycling, in particular to a coal chemical industry gasification black water waste heat recycling system and a switchable black water waste heat recycling system. A coal gasification black water waste heat recovery system comprises a high-pressure flash tank, a low-pressure flash tank, a heat exchange unit and a heat medium water system. The utility model has the beneficial effects that: the system realizes the efficient utilization of the heat of the gasified black water.
Description
Technical Field
The utility model relates to coal chemical industry waste heat recycling, in particular to a coal chemical industry gasification black water waste heat recycling system and a switchable black water waste heat recycling system.
Background
Coal chemical gasification technology generally adopts a coal water slurry gasification furnace or a pulverized coal gasification furnace. In the cooling and washing process of coal gasification, high-temperature gasification washing water at 230-260 ℃, namely gasification washing black water, is formed. The black water is required to be cooled to below 60 ℃ for clarification treatment and then is recycled.
The black water cooling and recovering system in the prior art comprises: the temperature is reduced to below 60 ℃ through the process flow of high-pressure, low-pressure and vacuum three-stage flash evaporation cooling and heat exchange cooling of a final-stage heat exchanger. Wherein, the temperature of the black water is reduced to about 130 ℃ after high-pressure flash evaporation and low-pressure flash evaporation, and the heat of the low-pressure steam which is flash evaporated is recycled. And the heat of the black water is cooled by cooling water when the temperature of the black water is reduced from 130 ℃ to 60 ℃, and the heat is not recycled.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to overcome the defects in the prior art, and provide a coal chemical gasification black water waste heat recycling system, which is used for reducing black water waste heat waste, reducing the consumption of water resources and electric energy, reducing the operation cost of enterprises and increasing the income of enterprises.
The utility model is realized by the following technical scheme: a coal gasification black water waste heat recovery system comprises a high-pressure flash tank, a low-pressure flash tank, a heat exchange unit and a heat medium water system;
the heat exchange unit comprises a black water part and a hot medium water part, the black water part is provided with a black water inlet and a black water outlet, the hot medium water part is provided with a hot medium water inlet and a hot medium water outlet, and the hot medium water system comprises a hot medium water pump and a hot user which are sequentially connected through a hot medium water pipeline;
the high-pressure flash tank and the low-pressure flash tank are sequentially connected with a black water inlet of the heat exchange unit, a heat medium water outlet of the heat exchange unit is communicated with an inlet of a heat medium water pump, and a heat user outlet is communicated with a heat medium water inlet of the heat exchange unit.
According to the technical scheme, preferably, the black water outlet of the heat exchange unit is connected with the clarifying tank through a black water pump.
According to the technical scheme, preferably, the heat exchange unit comprises one or more water-water heat exchangers.
According to the technical scheme, preferably, the hot user is one or more of a heating user, a hot water refrigerating unit and a hot water generating unit.
The switchable black water waste heat recovery system comprises the coal gasification black water waste heat recovery system, a vacuum flash tank is connected with a heat exchange unit in parallel, valves are arranged on two sides of the vacuum tank respectively, and valves are arranged on two sides of the heat exchange unit respectively.
The utility model has the beneficial effects that:
1. the system realizes the efficient utilization of the heat of the gasified black water. The system reduces the low-pressure black water at about 130 ℃ discharged by the low-pressure flash tank to below 60 ℃, the part of energy accounts for 20-30% of the total heat of the high-temperature black water, and the heat of the gasified black water is basically utilized by matching with the high-pressure flash and the low-pressure flash, so that the enterprise benefit is improved.
2. The system for recovering the black water waste heat can be used for municipal heating in winter and cold water provided by the refrigerator in summer, can be used for low-temperature power generation in places without heating and cooling requirements, saves the consumption of coal, is an important measure for saving energy, improving the environment and enhancing the functions of urban infrastructure, has good economic and social benefits, and is an important technical means of circular economy.
3. The system replaces a vacuum flash evaporation system, an original pipe type black water cooler and a circulating water cooling system, reduces power consumption and saves water resources.
Drawings
Fig. 1 shows a schematic front view of an embodiment of the present invention.
In the figure: 1. the system comprises a high-pressure flash tank, a low-pressure flash tank, a heat exchange unit, a heat user, a heating medium water pump, a black water pump, a clarifying tank, a vacuum flash tank, a first valve, a second valve and a cooler, wherein the high-pressure flash tank is 2, the low-pressure flash tank is 3, the heat exchange unit is 4, the heating medium water pump is 5, the black water pump is 6, the clarifying tank is 7, the vacuum flash tank is 8, the first valve is 9, the second valve is 10, and the cooler is 11.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.
As shown in the figure, the coal gasification black water waste heat recovery system comprises a high-pressure flash tank 1, a low-pressure flash tank 2, a heat exchange unit 3 and a heat consumer;
the heat exchange unit comprises a black water part and a hot medium water part, the black water part is provided with a black water inlet and a black water outlet, the hot medium water part is provided with a hot medium water inlet and a hot medium water outlet, and the hot medium water system comprises a hot medium water pump 5 and a hot user 4 which are sequentially connected through a hot medium water pipeline;
the high-pressure flash tank and the low-pressure flash tank are sequentially connected with a black water inlet of the heat exchange unit, a heat medium water outlet of the heat exchange unit is communicated with an inlet of a heat medium water pump, and a heat user outlet is communicated with a heat medium water inlet of the heat exchange unit.
According to the above embodiment, preferably, the black water outlet of the heat exchange unit is connected to the clarifier 7 through the black water pump 6.
According to the above embodiments, preferably, the heat exchange unit comprises one or more water-water heat exchangers.
According to the above embodiment, preferably, the hot user is one or more of a heating user, a hot water refrigerating unit and a hot water generating unit.
The switchable black water waste heat recovery system comprises the coal gasification black water waste heat recovery system, a vacuum flash tank 8 is connected with a heat exchange unit in parallel, a first valve 9 is arranged on each of two sides of the vacuum tank, and a second valve 10 is arranged on each of two sides of the heat exchange unit.
The working principle of the embodiment is as follows: the high-pressure flash tank and the low-pressure flash tank are devices in a black water cooling and recovering system in the prior art. And high-temperature black water output by the low-pressure flash tank enters a black water part of the heat exchange unit. The black water part and the heat medium water part carry out heat exchange, and the heated heat medium water is conveyed to a heat user through a heat medium water pump. And returning the heat medium water cooled at the hot user back to the heat exchange unit to continuously exchange heat with the black water. And after the black water is cooled, conveying the black water into a clarifying tank through a black water pump.
Wherein, the heat exchange unit can adopt a heat exchanger, in particular to a vertical blast furnace slag washing water multi-channel multi-flow heat exchanger with application number of 201920787904.1. The heat exchanger can solve the problems of high solid content of black water, easy blockage and abrasion and high difficulty in heat recovery.
The hot user can be a heating user, a hot water refrigerating unit, a hot water generating unit and the like.
And this technical scheme also can reequip in prior art's black water cooling recovery system. The vacuum flash tank is connected with the heat exchange unit in parallel, so that the vacuum flash tank and the heat exchange unit can be switched to use.
When the second valve is opened and the first valve is closed, the heat exchange unit is started, the vacuum flash pump is closed, and the cooler 11 in the original black water cooling and recycling system is also closed.
The beneficial effects of the utility model are:
1. the system realizes the efficient utilization of the heat of the gasified black water. The system reduces the low-pressure black water at about 130 ℃ discharged by the low-pressure flash tank to below 60 ℃, the part of energy accounts for 20-30% of the total heat of the high-temperature black water, and the heat of the gasified black water is basically utilized by matching with the high-pressure flash and the low-pressure flash, so that the enterprise benefit is improved.
2. The system for recovering the black water waste heat can be used for municipal heating in winter and cold water provided by the refrigerator in summer, can be used for low-temperature power generation in places without heating and cooling requirements, saves the consumption of coal, is an important measure for saving energy, improving the environment and enhancing the functions of urban infrastructure, has good economic and social benefits, and is an important technical means of circular economy.
3. The system replaces a vacuum flash evaporation system, an original pipe type black water cooler and a circulating water cooling system, reduces power consumption and saves water resources.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The coal gasification black water waste heat recovery system is characterized in that: the system comprises a high-pressure flash tank, a low-pressure flash tank, a heat exchange unit and a heat medium water system;
the heat exchange unit comprises a black water part and a hot medium water part, the black water part is provided with a black water inlet and a black water outlet, the hot medium water part is provided with a hot medium water inlet and a hot medium water outlet, and the hot medium water system comprises a hot medium water pump and a hot user which are sequentially connected through a hot medium water pipeline;
the high-pressure flash tank and the low-pressure flash tank are sequentially connected with a black water inlet of the heat exchange unit, a heat medium water outlet of the heat exchange unit is communicated with an inlet of a heat medium water pump, and a heat user outlet is communicated with a heat medium water inlet of the heat exchange unit.
2. The coal gasification black water waste heat recovery system according to claim 1, wherein: and a black water outlet of the heat exchange unit is connected with the clarifying tank through a black water pump.
3. The coal gasification black water waste heat recovery system according to claim 1, wherein: the heat exchange unit comprises one or more water-water heat exchangers.
4. The coal gasification black water waste heat recovery system according to claim 1, wherein: the hot user is one or more of a heating user, a hot water refrigerating unit and a hot water generating unit.
5. A switchable black water waste heat recovery system comprising the coal gasification black water waste heat recovery system according to any one of claims 1 to 4, wherein: the vacuum flash tank is connected with the heat exchange unit in parallel, a first valve is arranged on each of two sides of the vacuum tank, and a second valve is arranged on each of two sides of the heat exchange unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220321824.9U CN216737947U (en) | 2022-02-17 | 2022-02-17 | Coal gasification black water waste heat recovery system and switchable black water waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220321824.9U CN216737947U (en) | 2022-02-17 | 2022-02-17 | Coal gasification black water waste heat recovery system and switchable black water waste heat recovery system |
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| CN216737947U true CN216737947U (en) | 2022-06-14 |
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| CN202220321824.9U Active CN216737947U (en) | 2022-02-17 | 2022-02-17 | Coal gasification black water waste heat recovery system and switchable black water waste heat recovery system |
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2022
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