CN218763339U - Coal gasification gas waste heat recovery system of normal-pressure fluidized bed - Google Patents
Coal gasification gas waste heat recovery system of normal-pressure fluidized bed Download PDFInfo
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- CN218763339U CN218763339U CN202223127013.4U CN202223127013U CN218763339U CN 218763339 U CN218763339 U CN 218763339U CN 202223127013 U CN202223127013 U CN 202223127013U CN 218763339 U CN218763339 U CN 218763339U
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Abstract
The utility model relates to a waste heat recovery system of coal gasification gas of an atmospheric fluidized bed, which comprises a steam turbine condenser, a gas cooler and a deaerator; the steam turbine condenser is connected with an inlet of a coal gas cooler through a condensate pump by a first pipeline, the coal gas cooler is provided with a coal gas inlet for introducing coal gas, and an outlet of the coal gas cooler is connected with a deaerator by a fourth pipeline; and an inlet regulating valve is arranged on the first pipeline, and an outlet valve is arranged on the third pipeline. The coal gas is adopted to heat the steam turbine condensed water of the thermal power plant, the waste heat of the coal gas is effectively recovered, the steam quantity required by heating the steam turbine condensed water is reduced, the circulating water quantity required by cooling the coal gas is reduced, the water resource is saved, the coal consumption of a boiler is saved, the economic benefit of the power plant is improved, and the energy conservation and emission reduction are facilitated.
Description
Technical Field
The utility model belongs to the technical field of waste heat recovery, concretely relates to ordinary pressure fluidized bed coal gasification coal gas waste heat recovery system.
Background
The circulating fluidized bed coal gasification technology has the advantages of high system energy efficiency, high production capacity, wide coal type adaptability, low cost and the like, and is widely applied to industries such as ceramics, glass, steel, aluminum, magnesium, food, power generation and the like. Sensible heat of high-temperature coal gas generated by the coal gasifier is recovered through the air preheater and the waste heat boiler, the temperature of the coal gas after heat exchange is 150-180 ℃, and the coal gas needs to be cooled to about 50 ℃ in order to meet the requirements of users. The traditional cooling method adopts a washing or circulating water cooling mode, and wastes the part of heat.
And in order to guarantee the temperature that the condensate water gets into the oxygen-eliminating device among the steam power plant, the heating of condensate water needs to be realized through the steam of taking out of steam turbine, because partial steam has been taken out and goes to heat, under the equal admission steam volume condition, turbonator's generated energy reduces, just needs the steam volume that the increase got into the steam turbine in order to improve the generated energy, causes the coal-fired consumption to increase.
Disclosure of Invention
The utility model aims at providing an energy-conserving ordinary pressure fluidized bed coal gasification coal gas waste heat recovery system in order to solve the extravagant problem of above-mentioned energy.
The utility model aims at providing a waste heat recovery system of coal gasification gas of an atmospheric fluidized bed, which comprises a steam turbine condenser, a gas cooler and a deaerator; the steam turbine condenser is connected with an inlet of a coal gas cooler through a condensate pump by a first pipeline, the coal gas cooler is provided with a coal gas inlet for introducing coal gas, and an outlet of the coal gas cooler is connected with a deaerator by a fourth pipeline; and an inlet regulating valve is arranged on the first pipeline, and an outlet valve is arranged on the third pipeline.
The steam turbine condenser is connected with an inlet of the low-pressure heater through a condensate pump by a second pipeline, and an outlet of the low-pressure heater is connected with the deaerator by a third pipeline; and a low heater control valve is arranged on the second pipeline, and a low heater outlet valve is arranged on the fourth pipeline.
Compared with the prior art, the utility model discloses beneficial effect does: the utility model discloses ordinary pressure fluidized bed coal gasification coal gas waste heat recovery system adopts the coal gas heating steam turbine condensate water of steam power plant, has effectively retrieved the coal gas waste heat, has reduced the required steam volume of steam turbine condensate water heating, has reduced the required circulating water volume of cooling coal gas, has practiced thrift the water resource, has practiced thrift the coal-fired consumption of boiler, has improved the economic benefits of power plant, also helps energy saving and emission reduction.
Drawings
FIG. 1 is a schematic flow chart of the coal gasification gas waste heat recovery system of the atmospheric fluidized bed of the present invention.
Detailed Description
The device and the process of the present invention will be further explained in detail with reference to the accompanying drawings:
the coal gasification gas waste heat recovery system of the atmospheric fluidized bed shown in fig. 1 comprises a steam turbine condenser 1, a gas cooler 3, a low heater 8 and a deaerator 4. The steam turbine condenser 1 is connected with the inlet of the coal gas cooler 3 through the condensate pump 2 through the first pipeline, is connected with the inlet of the low heater 8 through the second pipeline, the outlet of the low heater is connected with the deaerator 4 through the third pipeline, and the outlet of the coal gas cooler 3 is connected with the deaerator 4 through the fourth pipeline. The gas cooler 3 is provided with a gas inlet 9 for introducing gas, an inlet regulating valve 5 is arranged on the first pipeline, a low-pressure heater control valve 6 is arranged on the second pipeline, an outlet valve 10 is arranged on the third pipeline, and a low-pressure heater outlet valve 7 is arranged on the fourth pipeline.
The condensed water in the steam turbine condenser 1 is pressurized by a condensed water pump 2 and then is sent to a gas cooler 3, the condensed water exchanges heat with the gas entering the gas cooler 3 through a gas inlet 9 in the gas cooler 3, and the temperature of the gas is cooled to 30-50 ℃ from 150-180 ℃; the condensed water heated in the gas cooler 3 is returned to the deaerator 4 to be used as boiler make-up water.
When the system normally operates, the inlet regulating valve 5 and the outlet valve 10 are opened, the low heater control valve 6 and the low heater outlet valve 7 are closed, the condensed water exchanges heat with the coal gas in the coal gas cooler 3, the coal gas is cooled to about 30-50 ℃ from 150-180 ℃, the condensed water is heated to about 130-145 ℃ from 30-45 ℃, and the amount of the condensed water entering the coal gas cooler 3 is controlled through the inlet regulating valve 5.
When the system of the gas cooler 3 fails, the inlet regulating valve 5 and the outlet valve 10 are closed, the low heater control valve 6 and the low heater outlet valve 7 are opened, and condensed water enters the deaerator 4 after being heated by the low heater 8.
When the heat of the gas cooler 3 is insufficient, the inlet regulating valve 5 and the outlet valve 10 are opened, the low heater control valve 6 and the low heater outlet valve 7 are opened, one part of condensed water is controlled by the inlet regulating valve 5 to be heated by the gas cooler 3, and the other part of the condensed water flows through the low heater 8 to be heated and then enters the deaerator 4.
Two normal pressure fluidized bed gasifiers are arranged in a certain chemical plant, and the total gas amount is 120000Nm 3 And the waste heat of the coal gas can be about 21.76GJ/h, the waste heat is utilized to heat the condensed water of the steam turbine of the thermal power plant, the consumption of standard coal can be saved by 742.7kg/h, and 5941.6 tons of standard coal can be saved every year.
Claims (2)
1. The utility model provides a normal pressure fluidized bed coal gasification coal gas waste heat recovery system which characterized in that: comprises a steam turbine condenser (1), a coal gas cooler (3) and a deaerator (4); the steam turbine condenser (1) is connected with an inlet of a coal gas cooler (3) through a condensate pump (2) by a first pipeline, the coal gas cooler (3) is provided with a coal gas inlet (9) for introducing coal gas, and an outlet of the coal gas cooler (3) is connected with a deaerator (4) by a fourth pipeline; and an inlet regulating valve (5) is arranged on the first pipeline, and an outlet valve (10) is arranged on the third pipeline.
2. The atmospheric fluidized bed coal gasification gas waste heat recovery system according to claim 1, characterized in that: the low-pressure heater is characterized by further comprising a low-pressure heater (8), the steam turbine condenser (1) is connected with an inlet of the low-pressure heater (8) through a condensate pump (2) through a second pipeline, and an outlet of the low-pressure heater is connected with the deaerator (4) through a third pipeline; and a low heater control valve (6) is arranged on the second pipeline, and a low heater outlet valve (7) is arranged on the fourth pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223127013.4U CN218763339U (en) | 2022-11-24 | 2022-11-24 | Coal gasification gas waste heat recovery system of normal-pressure fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223127013.4U CN218763339U (en) | 2022-11-24 | 2022-11-24 | Coal gasification gas waste heat recovery system of normal-pressure fluidized bed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218763339U true CN218763339U (en) | 2023-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223127013.4U Active CN218763339U (en) | 2022-11-24 | 2022-11-24 | Coal gasification gas waste heat recovery system of normal-pressure fluidized bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218763339U (en) |
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2022
- 2022-11-24 CN CN202223127013.4U patent/CN218763339U/en active Active
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