CN212713600U - Blast furnace gas waste heat power generation system - Google Patents

Blast furnace gas waste heat power generation system Download PDF

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Publication number
CN212713600U
CN212713600U CN202021563927.3U CN202021563927U CN212713600U CN 212713600 U CN212713600 U CN 212713600U CN 202021563927 U CN202021563927 U CN 202021563927U CN 212713600 U CN212713600 U CN 212713600U
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steam
blast furnace
water
furnace gas
gas
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程小伟
李柏松
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Zhongzhong Taide Energy Group Co ltd
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Zhongzhong Taide Energy Group Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The utility model provides a blast furnace gas waste heat power generation system relating to the field of gas power generation, which comprises an air source, a steam boiler, a steam turbine and a generator which are sequentially communicated through pipelines, and also comprises a gas waste heat recovery device; the utility model discloses can carry out make full use of to blast furnace gas, at first carry out the heat transfer with water and blast furnace gas through first heat exchanger, generate high-pressure high temperature steam, this part steam can directly get into doing work in the steam turbine. And (3) the coal gas after the first heat exchange enters a steam boiler, the generated carbon dioxide gas and high-temperature steam also enter a steam turbine to do work, the gas and the steam exhausted after the work is done are separated by a steam-water separator, and the separated high-temperature liquid water is recovered to exchange heat with the blast furnace gas again. The utility model makes full use of the blast furnace gas and saves energy consumption.

Description

Blast furnace gas waste heat power generation system
Technical Field
The utility model belongs to the technical field of gas power generation and specifically relates to a blast furnace gas waste heat power generation system.
Background
The steel industry developed vigorously has become one of the industries with the largest energy consumption in China. Steel mills produce a large amount of by-product gas, such as blast furnace gas and converter gas, during the smelting process. Wherein, the converter gas belongs to medium and high heat value gas and is basically recycled. The blast furnace gas with the maximum yield cannot be efficiently utilized due to the characteristics of lowest calorific value, difficult stable combustion, low power generation efficiency and the like.
The blast furnace gas is colorless, odorless and mixed gas, and has main components of CO and CO2、N2、H2、CH4Etc., wherein the combustible component CO content is about 25%; the contents of H2 and CH4 are small, and the influence on the total heat productivity is small; inert gas CO2、N2The content of the (B) is respectively 15 percent and 55 percent (both in volume fraction), the proportion is high, the (B) does not participate in combustion to generate heat and can not support combustion, and on the contrary, the (B) also absorbs a large amount of heat generated in the combustion process; flame temperature is low and combustion stability is poor; the heat value is generally 3100kJ/Nm3-4200kJ/Nm3, and the smoke gas amount is large. Therefore, how to efficiently utilize blast furnace gas becomes an important link for clean production and energy conservation in the steel industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a blast furnace gas waste heat power generation system to solve the problem that current blast furnace gas does not obtain make full use of.
The utility model discloses a realize like this: a blast furnace gas waste heat power generation system comprises a gas source, a steam boiler, a steam turbine and a generator which are sequentially communicated through pipelines, and further comprises a gas waste heat recovery device;
the coal gas waste heat recovery device comprises a first heat exchanger arranged between the gas source and the steam boiler; the first heat exchanger comprises a shell, a heat exchange cavity is formed in the shell, a coal gas inlet is formed in the lower portion of the shell, a coal gas outlet is formed in the upper portion of the shell, a heat exchange coil communicated with the coal gas inlet and the coal gas outlet is arranged in the heat exchange cavity, a spray pipe is arranged on the upper portion of the heat exchange cavity, a spray head is arranged on the spray pipe, one end of the spray pipe extends out of the shell and is communicated with a water source through a water inlet pipe, and a pressure pump is arranged on the water inlet pipe; the steam turbine comprises a shell, and is characterized in that a steam outlet is formed in the top of the shell, a recovery port is formed in the lower portion of the shell, the recovery port is communicated with a return water tank, and the steam outlet is communicated with an inlet of the steam turbine through a pipeline.
Preferably, the heat exchange coil is in the heat exchange intracavity is the multilayer setting, and each layer the heat exchange coil is snakelike distribution, and the heat exchange coil of adjacent layer passes through the elbow intercommunication.
Preferably, the outer wall of the heat exchange coil is provided with fins protruding outwards.
Preferably, an outlet of the steam turbine is connected with a steam-water separator through a pipeline, an air outlet is formed in the upper end of the steam-water separator, a water outlet is formed in the lower end of the steam-water separator, and the water outlet is communicated with the water return tank through a pipeline.
Preferably, the water return tank is communicated with the water inlet pipe through a water return branch pipe, and a first electromagnetic valve is arranged on the water return branch pipe.
Preferably, a dry dust collector is arranged between the air source and the first heat exchanger.
Preferably, the bottom of the housing is provided in a funnel shape.
Adopt above-mentioned technical scheme, the utility model discloses can carry out make full use of to blast furnace gas, at first carry out the heat transfer with water and blast furnace gas through first heat exchanger, generate high-pressure high-temperature steam, this part steam can directly get into doing work in the steam turbine. And (3) the coal gas after the first heat exchange enters a steam boiler, the generated carbon dioxide gas and high-temperature steam also enter a steam turbine to do work, the gas and the steam exhausted after the work is done are separated by a steam-water separator, and the separated high-temperature liquid water is recovered to exchange heat with the blast furnace gas again. The utility model makes full use of the blast furnace gas and saves energy consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic structural diagram of the heat exchange coil of the present invention.
In the figure: the system comprises a gas source 1, a steam boiler 2, a steam turbine 3, a steam turbine 4, a generator 5, a first heat exchanger 6, a shell 7, a heat exchange cavity 8, a heat exchange coil pipe 9, a spray pipe 10, a water inlet pipe 11, a water return tank 12, a pressure pump 13, a steam-water separator 14, a water return branch pipe 15, a first electromagnetic valve 16, a dry dust collector 17 and a water source.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 and 2, the utility model provides a blast furnace gas waste heat power generation system, which comprises an air source 1, a steam boiler 2, a steam turbine 3 and a generator 4 which are sequentially communicated through pipelines, and also comprises a gas waste heat recovery device.
The initial temperature of blast furnace gas is 700-. Comprising a first heat exchanger 5 arranged between the gas source 1 and the steam boiler 2. The first heat exchanger 5 comprises a shell 6, a heat exchange cavity 7 is formed in the shell 6, a coal gas inlet is formed in the lower portion of the shell 6, a coal gas outlet is formed in the upper portion of the shell 6, and a heat exchange coil 8 communicated with the coal gas inlet and the coal gas outlet is arranged in the heat exchange cavity. A spray pipe 9 is arranged at the upper part of the heat exchange cavity 7, a spray head is arranged on the spray pipe 9, and one end of the spray pipe 9 extends out of the shell 6 and is communicated with a water source 17 through a water inlet pipe 10. Be provided with steam outlet at the top of casing 6, be provided with in the lower part of casing 6 and retrieve the mouth, the bottom of casing 6 sets to hopper-shaped, and the liquid water of being convenient for is retrieved, retrieves mouth and return water tank 11 intercommunication. The steam outlet communicates with the inlet of the steam turbine 3 through a pipe. Preferably, heat exchange coil 8 is the multilayer setting in heat transfer chamber 7, and each layer of heat exchange coil is snakelike distribution, and the heat exchange coil 8 of adjacent layer passes through the elbow intercommunication, is provided with outside convex wing on heat exchange coil's outer wall, improves heat exchange efficiency. The initial blast furnace gas contains a large amount of heat, and the blast furnace gas passes through the heat exchange coil in the first heat exchanger and runs from bottom to top. The spray pipe sprays water downwards in the heat exchange cavity, and the water is quickly vaporized after contacting the high-temperature heat exchange coil pipe to form superheated steam with the temperature of 180 ℃ and 200 ℃. Further, the utility model discloses set up force (forcing) pump 12 on oral siphon 10, force (forcing) pump 12 pressurizes the water that gets into in the first heat exchanger, makes finally obtain pressure for more than 15MPa, the temperature is 180 supplyes high-pressure superheated steam of 200 ℃, and this part high-pressure superheated steam passes through the entry intercommunication of steam outlet, pipeline and steam turbine, gets into the acting in the steam turbine. The unvaporized water enters the water return tank 11 through the recovery port. Preferably, the temperature and pressure of the high pressure superheated steam may be specifically selected as required by the process conditions, for example in a preferred embodiment the absolute pressure may be 15MPa and the temperature 400 ℃ or higher.
The blast furnace gas after primary heat exchange enters the steam boiler 2 to be combusted to generate carbon dioxide gas and water vapor, and the obtained carbon dioxide gas and water vapor both have higher temperatures which are basically the same as the temperatures of the blast furnace gas before entering the first heat exchanger 5 because the blast furnace gas 2 has higher temperature and can continuously release heat in the combustion process. The generated carbon dioxide gas and the water vapor jointly drive the steam turbine 3 to do work and drive the generator 4 to generate electricity. Because the heat loss of the carbon dioxide gas and the water vapor in the process of driving the steam turbine 3 to do work is small, the discharged carbon dioxide gas and the water vapor still have high temperature.
Further, an outlet of the steam turbine 3 is connected with a steam-water separator 13 through a pipeline, an air outlet is formed in the upper end of the steam-water separator 13, a water outlet is formed in the lower end of the steam-water separator 13, and the water outlet is communicated with the water return tank 11 through a pipeline. After the treatment of the steam-water separator 13, the carbon dioxide gas is discharged from the gas outlet and recovered, and the water vapor is condensed into liquid water and sent to the recovery tank 11 for recovery through a pipeline.
Therefore, the water return tank 11 comprises the water recovered after the first heat exchange and the water recovered after the work is done, the two parts of water have higher temperature and can enter the first heat exchanger 5 again for heat exchange, the heat loss of the blast furnace gas is reduced, and the vaporization efficiency is higher. The return water tank 11 is communicated with the water inlet pipe through a return water branch pipe 14, and a first electromagnetic valve 15 is arranged on the return water branch pipe 14.
Because the blast furnace gas of the beginning contains a large amount of impurities, the utility model discloses be provided with dry dust collector 16 between air supply 1 and first heat exchanger 5, preferably adopt the sack cleaner. The dry dust remover can not cause the temperature of the gas to be reduced in the process of removing dust of the blast furnace gas, and can effectively reduce the heat loss in the dust removing process of the blast furnace gas.
The utility model discloses can carry out make full use of to blast furnace gas, at first carry out the heat transfer with water and blast furnace gas through first heat exchanger, generate high-pressure high temperature steam, this part steam can directly get into doing work in the steam turbine. And (3) the coal gas after the first heat exchange enters a steam boiler, the generated carbon dioxide gas and high-temperature steam also enter a steam turbine to do work, the gas and the steam exhausted after the work is done are separated by a steam-water separator, and the separated high-temperature liquid water is recovered to exchange heat with the blast furnace gas again. The utility model makes full use of the blast furnace gas and saves energy consumption.
Finally, it should be noted that: 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 embodiments of the present invention.

Claims (7)

1. A blast furnace gas waste heat power generation system is characterized by comprising a gas source, a steam boiler, a steam turbine and a generator which are sequentially communicated through pipelines, and further comprising a gas waste heat recovery device;
the coal gas waste heat recovery device comprises a first heat exchanger arranged between the gas source and the steam boiler; the first heat exchanger comprises a shell, a heat exchange cavity is formed in the shell, a coal gas inlet is formed in the lower portion of the shell, a coal gas outlet is formed in the upper portion of the shell, a heat exchange coil communicated with the coal gas inlet and the coal gas outlet is arranged in the heat exchange cavity, a spray pipe is arranged on the upper portion of the heat exchange cavity, a spray head is arranged on the spray pipe, one end of the spray pipe extends out of the shell and is communicated with a water source through a water inlet pipe, and a pressure pump is arranged on the water inlet pipe; the steam turbine comprises a shell, and is characterized in that a steam outlet is formed in the top of the shell, a recovery port is formed in the lower portion of the shell, the recovery port is communicated with a return water tank, and the steam outlet is communicated with an inlet of the steam turbine through a pipeline.
2. The blast furnace gas waste heat power generation system according to claim 1, wherein the heat exchange coil pipes are arranged in a plurality of layers in the heat exchange cavity, each layer of the heat exchange coil pipes is distributed in a snake shape, and the heat exchange coil pipes in adjacent layers are communicated through elbows.
3. The blast furnace gas waste heat power generation system according to claim 2, wherein the heat exchange coil is provided with outwardly protruding fins on the outer wall thereof.
4. The blast furnace gas waste heat power generation system according to claim 1, wherein an outlet of the steam turbine is connected with a steam-water separator through a pipeline, an air outlet is formed in the upper end of the steam-water separator, a water outlet is formed in the lower end of the steam-water separator, and the water outlet is communicated with the water return tank through a pipeline.
5. The blast furnace gas waste heat power generation system according to claim 1, wherein the water return tank is communicated with the water inlet pipe through a water return branch pipe, and a first electromagnetic valve is arranged on the water return branch pipe.
6. The blast furnace gas waste heat power generation system according to claim 1, wherein a dry dust collector is disposed between the gas source and the first heat exchanger.
7. The blast furnace gas cogeneration system of claim 1, wherein the bottom of said housing is configured as a funnel.
CN202021563927.3U 2020-07-31 2020-07-31 Blast furnace gas waste heat power generation system Active CN212713600U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021563927.3U CN212713600U (en) 2020-07-31 2020-07-31 Blast furnace gas waste heat power generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021563927.3U CN212713600U (en) 2020-07-31 2020-07-31 Blast furnace gas waste heat power generation system

Publications (1)

Publication Number Publication Date
CN212713600U true CN212713600U (en) 2021-03-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021563927.3U Active CN212713600U (en) 2020-07-31 2020-07-31 Blast furnace gas waste heat power generation system

Country Status (1)

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CN (1) CN212713600U (en)

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