CN212615038U - High-temperature coal gas waste heat recovery power generation system - Google Patents
High-temperature coal gas waste heat recovery power generation system Download PDFInfo
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- CN212615038U CN212615038U CN202021570655.XU CN202021570655U CN212615038U CN 212615038 U CN212615038 U CN 212615038U CN 202021570655 U CN202021570655 U CN 202021570655U CN 212615038 U CN212615038 U CN 212615038U
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Abstract
The utility model provides a high-temperature coal gas waste heat recovery power generation system relating to the technical field of coal gas power generation, which comprises a high-calorific value coal gas power generation system and a low-calorific value coal gas power generation system; the high-calorific-value gas power generation system comprises a blast furnace gas source, a first purification device, a gas turbine, a gas compressor, a first power generator and a flue gas collection device; the low-calorific-value gas power generation system comprises a converter gas source, a second purification device, a steam boiler, a high-pressure steam turbine and a second generator; the utility model discloses according to the difference of calorific value, blast furnace gas, the converter gas classification that produce the steel mill, blast furnace gas adopts gas turbine to generate electricity, and converter gas passes through the steam turbine electricity generation, has still set up the waste smoke that the heat exchanger produced two parts and has carried out recycle, has improved coal gas waste heat recovery efficiency.
Description
Technical Field
The utility model belongs to the technical field of the gas power generation technique and specifically relates to a high temperature coal gas waste heat recovery power generation system.
Background
With the increasing shortage of resource and energy problems, steel enterprises pay more attention to the development and application of steel energy-saving technology while improving the quality of steel products, and have achieved remarkable results. By applying the energy-saving and consumption-reducing technology and recovering secondary energy, energy consumed by enterprises is continuously reduced, the recovery amount of waste heat and residual energy is continuously increased, the comprehensive energy consumption of each ton of steel is greatly reduced, but the difference between the energy consumption of the steel and the energy consumption of developed countries is still small, so that the energy-saving and emission-reducing technology is encouraged to be further developed and applied, and high-level energy-saving and emission-reducing indexes are reached as early as possible.
At present, a large amount of coal gas, such as blast furnace gas, converter gas and the like, is generated in the production process of steel enterprises, and about 34 percent of waste residual coal gas is still left except the self-use part of the production of the steel enterprises. The waste residual gas still has a large amount of energy, and the heat value of the blast furnace gas is 3000KJ/m3The heat value of the converter gas is 6200KJ/m3Left and right. In order to save resources and improve the energy utilization rate, the waste residual gas is reused. The existing technical scheme for recycling waste coal gas in iron and steel enterprises is as follows: the two types of the steam are all put into a boiler for combustion to generate medium-temperature medium-pressure or high-temperature high-pressure steam, and the generated steam is used for driving a steam turbine; the steam turbine drives the blast furnace blower to provide compressed air for the blast furnace, or the steam turbine drives the generator to generate electricity. Such asThe scheme has the following defects: first, in the waste residual gas recycling system composed of the boiler and the steam turbine set in the scheme, a large amount of energy is wasted, and the power generation efficiency and the driving efficiency of the blower are very low. Secondly, the method comprises the following steps: according to the scheme, two kinds of coal gas adopt the same treatment scheme, the blast furnace coal gas is high-quality coal gas, the blast furnace coal gas enters a boiler to be combusted to generate steam and then drives a steam turbine, the steam turbine drives a blast furnace blower or a generator, the energy efficiency of the blast furnace coal gas is not more than 38%, and the energy utilization rate of the blast furnace coal gas is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high temperature coal gas waste heat recovery power generation system to solve the problem that current iron and steel enterprise coal gas was recycled.
The utility model discloses a realize like this: a high-temperature gas waste heat recovery power generation system comprises a high-calorific value gas power generation system and a low-calorific value gas power generation system;
the high-calorific-value gas power generation system comprises a blast furnace gas source, a first purification device, a gas turbine, a gas compressor, a first power generator and a flue gas collection device;
the low-calorific-value gas power generation system comprises a converter gas source, a second purification device, a steam boiler, a high-pressure steam turbine and a second generator;
the gas source of the blast furnace gas is sequentially communicated with the first purifying device and the gas inlet of the gas turbine through pipelines, the gas compressor provides air for the gas turbine, the output shaft of the gas turbine is connected with the first generator, and the exhaust port of the gas turbine is communicated with the flue gas collecting device;
the converter gas source is sequentially communicated with the second purifying device and a steam boiler through pipelines, a steam outlet of the steam boiler is communicated with the high-pressure steam turbine, the high-pressure steam turbine applies work to drive the second generator to generate electricity, and an exhaust port of the steam boiler is communicated with the flue gas collecting device;
the outlet of the flue gas collecting device is communicated with the heat exchanger through a pipeline, a flue gas coil pipe for flue gas to pass through is arranged in the heat exchanger, a first water inlet, a second water inlet and a steam outlet are arranged on the heat exchanger, the steam outlet is connected with a low-pressure turbine through a pipeline, and an output shaft of the low-pressure turbine is connected with a third generator.
Preferably, the steam exhaust outlets of the high pressure turbine and the low pressure turbine are respectively communicated with a condenser through pipelines, and the water outlet of the condenser is communicated with the first water inlet of the heat exchanger through a pipeline.
Preferably, the second water inlet is communicated with the steel mill waste heat steam collecting device through a pipeline.
Preferably, the first purification device and the second purification device are both dry purifiers.
Preferably, a first water pump is arranged on a pipeline between the condenser and the heat exchanger.
Preferably, a second water pump is arranged on a pipeline between the second water inlet and the steel mill waste heat steam collecting device.
Preferably, a first electromagnetic valve is arranged on a pipeline between the exhaust port of the gas turbine and the flue gas collecting device, and a second electromagnetic valve is arranged on a pipeline between the exhaust port of the steam boiler and the flue gas collecting device.
Adopt above-mentioned technical scheme, the utility model discloses according to the difference of calorific value, to blast furnace gas, the converter gas classification that the steel mill produced, blast furnace gas adopts gas turbine to generate electricity, and converter gas passes through the steam turbine electricity generation, has still set up the waste smoke that the heat exchanger produced two parts and has carried out recycle, has improved coal gas waste heat recovery efficiency.
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.
In the figure: 1-blast furnace gas source, 2-first purifying device, 3-gas turbine, 4-compressor, 5-first generator, 6-flue gas collecting device, 7-converter gas source, 8-second purifying device, 9-steam boiler, 10-high pressure turbine, 11-second generator, 12-heat exchanger, 13-low pressure turbine, 14-third generator, 15-condenser, 16-steel mill waste heat steam collecting device, 17-first water pump, 18-second water pump, 19-first electromagnetic valve, 20-second electromagnetic valve.
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, the utility model provides a high-temperature gas waste heat recovery power generation system, which comprises a high calorific value gas power generation system and a low calorific value gas power generation system.
The high-calorific-value gas power generation system comprises a blast furnace gas source 1, a first purification device 2, a gas turbine 3, a gas compressor 4, a first power generator 5 and a flue gas collection device 6. The blast furnace gas source 1 is sequentially communicated with the first purifying device 2 and a gas inlet of the gas turbine 3 through pipelines, the blast furnace gas is purified by the first purifying device 2 and enters a combustion chamber of the gas turbine 3, and air is compressed by the gas compressor 4 and then also enters the combustion chamber of the gas turbine 3 to provide oxygen for the combustion of the blast furnace gas. The high-temperature and high-pressure products after the blast furnace gas is combusted enter the gas turbine 3 to do work and discharge high-temperature flue gas, the output shaft of the gas turbine 3 is connected with the first generator 5, and the gas turbine 3 drives the first generator 5 to generate electricity. The exhaust port of the gas turbine 3 is communicated with the flue gas collecting device 6, and the exhausted high-temperature flue gas is collected by the flue gas collecting device 6.
The low-heating-value gas power generation system comprises a converter gas source 7, a second purification device 8, a steam boiler 9, a high-pressure steam turbine 10 and a second generator 11. The converter gas source is sequentially communicated with a second purification device 8 and a steam boiler 9 through pipelines, the converter gas enters the steam boiler 9 for combustion after being purified, a steam outlet of the steam boiler 9 is communicated with a high-pressure steam turbine 10, the high-pressure steam turbine 10 does work to drive a second generator 11 to generate electricity, and an exhaust port of the steam boiler 9 is communicated with a flue gas collection device 6.
The flue gas in the flue gas collecting device 6 is formed by mixing the combustion flue gas of the gas turbine 3 and the combustion flue gas of the steam boiler 9, and the temperature of the combustion flue gas is 500-550 ℃. The outlet of the flue gas collecting device 6 is communicated with the heat exchanger 12 through a pipeline, a flue gas coil pipe for flue gas to pass through is arranged in the heat exchanger 12, a first water inlet, a second water inlet and a steam outlet are arranged on the heat exchanger 12, the steam outlet is connected with a low pressure turbine 13 through a pipeline, and an output shaft of the low pressure turbine 13 is connected with a third generator 14.
Further, the exhaust steam outlets of the high pressure turbine 10 and the low pressure turbine 13 are respectively communicated with a condenser 15 through a pipeline, and a water outlet of the condenser 15 is communicated with a first water inlet of the heat exchanger 12 through a pipeline. As a large amount of high-temperature steam is generated in the production process of the steel mill, the second water inlet of the heat exchanger 12 is communicated with the steel mill waste heat steam collecting device 16 through a pipeline. After the exhaust steam generated by the high-pressure steam turbine and the low-pressure steam turbine is condensed by the condenser 15, the formed condensed water has a certain temperature, flows back to the ventilation heat 12 to exchange heat with the combusted flue gas, and forms high-temperature steam again to enter the steam turbine to do work.
Preferably, the first purification device and the second purification device are both dry purifiers, such as bag-type dust collectors.
Further, a first water pump 17 is provided on the pipe between the condenser 15 and the heat exchanger 12. And a second water pump 18 is arranged on a pipeline between the second water inlet and the steel mill waste heat steam collecting device 16. The first water pump 17 and the second water pump 18 control the amount of water in the heat exchange.
Further, a first electromagnetic valve 19 is provided in a pipe between the exhaust port of the gas turbine 3 and the flue gas collecting device 6, and a second electromagnetic valve 20 is provided in a pipe between the exhaust port of the steam boiler 9 and the flue gas collecting device 6.
The utility model discloses according to the difference of calorific value, blast furnace gas, the converter gas classification that produce the steel mill, blast furnace gas adopts gas turbine to generate electricity, and converter gas passes through the steam turbine electricity generation, has still set up the waste smoke that the heat exchanger produced two parts and has carried out recycle, has improved coal gas waste heat recovery efficiency.
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 high-temperature gas waste heat recovery power generation system is characterized by comprising a high-calorific-value gas power generation system and a low-calorific-value gas power generation system;
the high-calorific-value gas power generation system comprises a blast furnace gas source, a first purification device, a gas turbine, a gas compressor, a first power generator and a flue gas collection device;
the low-calorific-value gas power generation system comprises a converter gas source, a second purification device, a steam boiler, a high-pressure steam turbine and a second generator;
the gas source of the blast furnace gas is sequentially communicated with the first purifying device and the gas inlet of the gas turbine through pipelines, the gas compressor provides air for the gas turbine, the output shaft of the gas turbine is connected with the first generator, and the exhaust port of the gas turbine is communicated with the flue gas collecting device;
the converter gas source is sequentially communicated with the second purifying device and a steam boiler through pipelines, a steam outlet of the steam boiler is communicated with the high-pressure steam turbine, the high-pressure steam turbine applies work to drive the second generator to generate electricity, and an exhaust port of the steam boiler is communicated with the flue gas collecting device;
the outlet of the flue gas collecting device is communicated with the heat exchanger through a pipeline, a flue gas coil pipe for flue gas to pass through is arranged in the heat exchanger, a first water inlet, a second water inlet and a steam outlet are arranged on the heat exchanger, the steam outlet is connected with a low-pressure turbine through a pipeline, and an output shaft of the low-pressure turbine is connected with a third generator.
2. The high-temperature gas waste heat recovery power generation system according to claim 1, wherein the waste steam outlets of the high-pressure turbine and the low-pressure turbine are respectively communicated with a condenser through a pipeline, and the water outlet of the condenser is communicated with the first water inlet of the heat exchanger through a pipeline.
3. The high-temperature coal gas waste heat recovery power generation system as claimed in claim 1, wherein the second water inlet is communicated with a steel mill waste heat steam collecting device through a pipeline.
4. The high-temperature gas waste heat recovery power generation system according to claim 1, wherein the first purification device and the second purification device are both dry purifiers.
5. The high-temperature gas waste heat recovery power generation system as claimed in claim 2, wherein a first water pump is arranged on a pipeline between the condenser and the heat exchanger.
6. The high-temperature coal gas waste heat recovery power generation system as claimed in claim 3, wherein a second water pump is arranged on a pipeline between the second water inlet and the steel mill waste heat steam collecting device.
7. The high-temperature gas waste heat recovery power generation system according to claim 1, wherein a first electromagnetic valve is arranged on a pipeline between the exhaust port of the gas turbine and the flue gas collection device, and a second electromagnetic valve is arranged on a pipeline between the exhaust port of the steam boiler and the flue gas collection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021570655.XU CN212615038U (en) | 2020-07-31 | 2020-07-31 | High-temperature coal gas waste heat recovery power generation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021570655.XU CN212615038U (en) | 2020-07-31 | 2020-07-31 | High-temperature coal gas waste heat recovery power generation system |
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| CN212615038U true CN212615038U (en) | 2021-02-26 |
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