CN213331203U - Regenerative heat source system of coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device - Google Patents
Regenerative heat source system of coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device Download PDFInfo
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- CN213331203U CN213331203U CN202022418312.8U CN202022418312U CN213331203U CN 213331203 U CN213331203 U CN 213331203U CN 202022418312 U CN202022418312 U CN 202022418312U CN 213331203 U CN213331203 U CN 213331203U
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Abstract
A regenerative heat source system of a coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device comprises a steam system, an air system and a steam recovery system; the steam system comprises a boiler system and a steam-air heat exchanger, and steam inlets of the boiler system and the steam-air heat exchanger are connected through a reheat steam extraction pipeline; the air system comprises a carbon-based catalyst regeneration tower heating section and a high-temperature air circulating fan, wherein the high-temperature air circulating fan, the carbon-based catalyst regeneration tower heating section and the steam-air heat exchanger are sequentially connected to form an air circulation loop; the steam recovery system comprises a main steam turbine and a steam turbine heat recovery system, wherein the steam turbine heat recovery system comprises a condenser, a low-pressure heater and a deaerator which are sequentially connected, the condenser is connected with the main steam turbine, and the deaerator is connected with a boiler system; and a steam outlet of the steam-air heat exchanger is respectively connected with the low-pressure heater and the deaerator. The utility model provides a be applicable to coal-fired power plant, adopt the regeneration heat source system of well low pressure steam as the heat source.
Description
Technical Field
The utility model relates to a coal fired power plant carbon-based catalysis method flue gas desulfurization denitrification facility's regeneration heat source system belongs to the environmental engineering field.
Background
Carbon-based catalyst flue gas desulfurization and denitrification technologyThe principle is as follows: SO in the flue gas under the adsorption and catalysis of the carbon-based catalyst2And O2And H20 is reacted to form H2SO4，H2SO4Adsorbing on the surface of the carbon-based catalyst; simultaneously, NOx in the flue gas and ammonia gas are subjected to catalytic reduction reaction to generate N by utilizing the catalytic performance of the carbon-based catalyst2And the desulfurization and denitrification of the flue gas are realized. And regenerating the carbon-based catalyst subjected to the adsorption catalysis reaction and then recycling.
The regeneration process of the carbon-based catalyst mainly comprises two kinds of water washing and thermal regeneration, but the water washing regeneration process consumes a large amount of water, generates acid wastewater and forms secondary pollution, so the most widely and mature regeneration method in industry is thermal regeneration.
The carbon-based catalyst with saturated adsorption can realize a regeneration process under a high-temperature environment of more than 400 ℃, so that the process is a high-energy-consumption process. For industries such as metallurgy and iron and steel, low calorific value fuels such as blast furnace gas generated by the self process can be directly utilized. For foreign coal-fired power stations using the technology, electric energy or fuel is used as a regenerative heat source. Compared with the regenerative heat sources, electric energy is one of the cleanest and easily available heat sources, but as high-grade energy, the large consumption can lead the plant power rate to be increased sharply, and the economical ratio is poorer. Therefore, for the coal-fired power plant, the feasible lower-grade heat sources are medium-low pressure steam and flue gas, but compared with the steam, a flue gas system is more complex, and the influence of extracting a large amount of flue gas on the boiler is larger; in addition, under different loads of the unit, the change of the flue gas parameters is large, the required heat exchange area is also changed greatly, and the design of the heat exchange section of the carbon-based catalytic regeneration device is difficult.
SUMMERY OF THE UTILITY MODEL
The invention aims to solve the problems in the prior art and provides a regenerative heat source system of a carbon-based catalytic flue gas desulfurization and denitrification device, which is suitable for a coal-fired power plant and adopts medium-low pressure steam as a heat source.
In order to achieve the purpose, the technical scheme provided by the invention is as follows: a regenerative heat source system of a coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device comprises a steam system, an air system and a steam recovery system;
the steam system comprises a boiler system and a steam-air heat exchanger, and steam inlets of the boiler system and the steam-air heat exchanger are connected through a reheat steam extraction pipeline;
the air system comprises a carbon-based catalyst regeneration tower heating section and a high-temperature air circulating fan, wherein the high-temperature air circulating fan, the carbon-based catalyst regeneration tower heating section and the steam-air heat exchanger are sequentially connected to form an air circulating loop;
the steam recovery system comprises a main turbine and a turbine regenerative system, the turbine regenerative system comprises a condenser, a low-pressure heater and a deaerator which are sequentially connected, the condenser is connected with the main turbine, and the deaerator is connected with a boiler system; and a steam outlet of the steam-air heat exchanger is respectively connected with the low-pressure heater and the deaerator.
The technical scheme is further designed as follows: and a steam outlet of the steam air heat exchanger is connected with a steam pressure reducing valve device through a steam discharge pipeline after heat exchange, and an outlet of the steam pressure reducing valve device is respectively connected with the low-pressure heater and the deaerator.
The steam recovery system further comprises a small steam turbine, an outlet of the steam pressure reducing valve device is connected with the small steam turbine, and a steam outlet of the small steam turbine is connected with the condenser.
The steam-air heat exchanger is connected with a reheat steam pipeline of the boiler system. And a shaft seal heater is arranged between the condenser and the low-pressure heater. And a water pump is arranged between the condenser and the shaft seal heater. And a high-pressure heater is arranged between the deaerator and the boiler. And a water pump is arranged between the deaerator and the high-pressure heater.
The low-pressure heaters are four and are sequentially connected, and the deaerator and the four low-pressure heaters extract steam of a medium-pressure cylinder or a low-pressure cylinder of the main steam turbine.
The high pressure heater is provided with three, and three low pressure heater connects gradually, and three low pressure heater extracts main steam turbine intermediate pressure jar or high-pressure cylinder steam.
The utility model has the advantages that:
1. the utility model discloses a coal fired power plant is applied to charcoal base catalysis method gas cleaning technique provides a feasible charcoal base catalysis method gas desulfurization denitrification facility's regeneration heat source system, can establish the basis for the extensive popularization and application of charcoal base catalysis method gas cleaning technique in the thermoelectricity trade.
2. The utility model discloses in the system, the reheat steam of boiler system is adopted to the regeneration heat source system, for the lower well low pressure steam of energy grade, replaces the electric energy of high grade, has avoided the improvement of station service power consumption, has good economic nature.
3. The utility model discloses in the system, the steam volume of regeneration heat source system extraction can change according to the change of unit load to design waste heat recovery's scheme, thereby furthest's realization energy saving and emission reduction efficiency can play the consumption that has both reduced charcoal base catalyst, saves the purpose of the required energy of regeneration again.
4. The utility model discloses in the system, set up the steam recovery system, the steam after with the regeneration heat transfer returns the oxygen-eliminating device of steam turbine backheat system and low pressure feed water heater at different levels, is favorable to reducing the high pressure and bleeds, is favorable to the improvement of unit thermal efficiency.
5. The utility model discloses in the system, set up steam recovery system, the little steam turbine of steam turbine backheat system is returned to the steam after the heat transfer that will regenerate, is favorable to reducing the high pressure and bleeds, reduces the cold source loss, is favorable to the improvement of unit thermal efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a regenerative heat source system according to the present invention;
fig. 2 is a schematic structural view of the middle steam recovery system of the present invention.
In the figure: 1-a boiler system; 2-a steam-air heat exchanger; 13-high temperature air blower; 14-a heating section of a carbon-based catalyst regeneration tower; 15-reheat steam extraction line; 16-a steam discharge pipeline after heat exchange; 10-a steam pressure reducing valve device; 3-a small steam turbine; 4-a deaerator; 5-5# Low pressure Heater; 6-6# Low pressure Heater; 7-7# Low pressure Heater; 8-8# Low pressure Heater; 9-a condenser; 11-shaft seal heater.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Examples
As shown in fig. 1, the regenerative heat source system of the coal-fired power plant carbon-based catalytic flue gas desulfurization and denitration device of the embodiment is characterized in that: comprises a steam system, an air system and a steam recovery system;
the steam system comprises a boiler system 1 and a steam-air heat exchanger 2, and steam inlets of the boiler system 1 and the steam-air heat exchanger 2 are connected through a reheat steam extraction pipeline 5; and a steam outlet of the steam air heat exchanger 2 is connected with a steam pressure reducing valve device 10 through a steam discharge pipeline 6 after heat exchange, and an outlet of the steam pressure reducing valve device 10 is respectively connected with a low-pressure heater and a deaerator.
The air system comprises a carbon-based catalyst regeneration tower heating section 4 and a high-temperature air circulating fan 3, an air outlet of a steam-air heat exchanger 2 is connected with an inlet of the high-temperature air circulating fan 3, an outlet of the high-temperature air circulating fan 3 is connected with the carbon-based catalyst regeneration tower heating section 4, and the carbon-based catalyst regeneration tower heating section 4 is connected with an air inlet of the steam-air heat exchanger 2, so that an air circulation loop is formed; because the carbon-based catalyst needs to be heated to 400 ℃ from 80 ℃ in the regeneration of the carbon-based catalyst, the extracted steam needs to be above 400 ℃ under each load, the reheated steam before entering a pressure cylinder in a steam turbine is extracted in the embodiment, and the steam-air heat exchanger 2 exchanges heat with air by using the reheated steam of a boiler system to provide a heat source for the carbon-based catalyst regeneration tower.
As shown in fig. 2, the steam recovery system comprises a main steam turbine and a steam turbine heat recovery system, the main steam turbine is provided with a high pressure cylinder, an intermediate pressure cylinder and a low pressure cylinder which are connected in sequence, the high pressure cylinder is connected with a main steam pipeline of the boiler system, the intermediate pressure cylinder is connected with a reheat steam pipeline of the boiler system, the steam turbine heat recovery system comprises a condenser 9, a low pressure heater and a deaerator 4 which are connected in sequence, the condenser 9 is connected with the low pressure cylinder, and the deaerator 4 is connected with the boiler system; and a steam outlet of the steam-air heat exchanger 2 is respectively connected with the low-pressure heater and the deaerator 4.
In this embodiment, the steam turbine regenerative system is provided with four low-pressure heaters connected in sequence, which are respectively a # 5 low-pressure heater 5, a # 6 low-pressure heater 6, a # 7 low-pressure heater 7 and a # 8 low-pressure heater 8, the four low-pressure heaters respectively extract steam from an intermediate pressure cylinder or a low pressure cylinder of the main steam turbine, the steam turbine regenerative system is further provided with three high-pressure heaters connected in sequence, and the three high-pressure heaters respectively extract steam from the intermediate pressure cylinder or the high pressure cylinder of the main steam turbine.
In this embodiment, the steam recovery system further includes a small turbine 3, an outlet of the steam pressure reducing valve device 10 is connected to the small turbine 3, and a steam outlet of the small turbine is connected to the condenser.
The reheat steam pressure extracted by the steam-air heat exchanger 2 of the embodiment is large, and the steam pressure drop of the reheat steam in the steam-air heat exchanger 2 is extremely small, so that a steam pressure reducing valve 10 needs to be additionally arranged on a steam discharge pipeline after heat exchange of the small steam turbine 3 or the deaerator 4 and each stage of low-pressure heaters 5-8, so that the reheat steam can smoothly enter the steam-air heat exchanger by itself, and the working pressure of the small steam turbine 3 or the deaerator 4 and each stage of low-pressure heaters is not influenced.
In the steam turbine regenerative system in this embodiment, a shaft seal heater 11 is disposed between the condenser 9 and the low-pressure heater, and a water pump is further disposed between the condenser 9 and the shaft seal heater 11.
In this embodiment, the high pressure heater is arranged between the deaerator 4 and the boiler system 1, and a water pump is also arranged between the deaerator 4 and the high pressure heater.
Because the heat required by the regeneration of the carbon-based catalyst can change along with the change of the load of the unit, the embodiment can perform thermodynamic calculation aiming at the heating section of the regeneration tower of the carbon-based catalytic method according to the change of the load of the unit, and change the amount of the extracted reheated steam, thereby controlling the regeneration heat of the carbon-based catalyst, and achieving the purposes of reducing the consumption of the carbon-based catalyst and saving the energy required by the regeneration. The design method of the steam recovery system provided by the embodiment includes the steps that thermal calculation is carried out on a turbine regenerative system according to an equivalent enthalpy drop method, main steam parameters and reheat steam parameters are controlled to be unchanged, heat balance equations of heater rows at all levels are calculated to obtain steam extraction quantity at all levels, steam returns to a small turbine 3 or a deaerator 4, redundant steam can squeeze low-pressure heaters 5-8 at each level to extract air, the principle of extracting air with high squeezing pressure levels as far as possible is adhered to, and calculation formulas of the heat balance equations of the heaters at all levels are respectively shown in formulas (1) - (6):
in the formula: alpha is alphaxq、α4～α8、αf4、αf8、αzf、αhRespectively taking an air extraction share of a small steam turbine, a deaerator and extraction steam shares of four low-pressure heaters, removing a shaft seal steam share of the deaerator, a shaft seal steam share of the low-pressure heater closest to the condenser, a shaft seal steam share of the shaft seal heater and an extraction steam share of the steam-air heat exchanger;
τ4、
respectively supplying water enthalpy to a deaerator, the deaerator, water supplying enthalpy from outlets of four low-pressure heaters and condensed water enthalpy from an outlet of a condenser;
q4～q8the heat release of the steam extraction of the deaerator and the four low-pressure heaters are respectively;
γ3、
respectively the high-heating hydrophobic heat release and the hydrophobic outlet enthalpy which are closest to the deaerator, kJ/kg;
Wxq、hh、hf4、hf8、hzf、hxqthe method comprises the steps of respectively obtaining power of a small steam turbine, steam enthalpy after heat exchange, shaft seal steam enthalpy for removing an oxygen device, shaft seal steam enthalpy for removing a low-pressure heater closest to a condenser, shaft seal steam enthalpy for removing a shaft seal heater and outlet steam enthalpy of the small steam turbine.
In the embodiment, the small steam turbine 3, the deaerator 4 and the four-stage low-pressure heater can extract steam from the main steam turbine and the steam-air heat exchanger, and the steam in the steam-air heat exchanger is preferably extracted in the embodiment; the specific calculation method of each stage of steam extraction of the steam recovery system comprises the steps of adopting a formula (1) to calculate the steam extraction share of the small steam turbine when the heat of the steam air heat exchanger returning to the steam of the steam recovery system only needs to exhaust the steam of the small steam turbine to meet the heat balance of the heat recovery system, adopting a formula (2) to calculate the steam extraction share of the deaerator 4 when the heat of the returning steam exhausts the steam of the small steam turbine and the deaerator 4 needs to be exhausted, adopting a formula (3) to calculate the steam extraction share of the 5# low-pressure heater when the heat of the returning steam exhausts the steam of the 4# low-pressure heater and the deaerator 5# low-pressure heater needs to be exhausted, and analogizing the same.
The judgment standard of the heat of the steam air heat exchanger returning to the steam of the steam recovery system for exhausting steam at each stage is as follows, if the steam of the small steam turbine is exhausted and the deaerator 4 is required to exhaust steam, the calculation result alpha of the formula (1) isxqIs negative; if the deaerator 4 is completely squeezed to extract steam and the 5# heater needs to be squeezed, the calculation result alpha of the formula (2)4Is negative. Calculating the equations (1) - (6) in sequence, the first occurrence of a certain stage of steam extractionIf the calculation result is positive, the calculation is stopped, the steam extraction share of the steam extracted from the main turbine before the stage is 0, only the steam is extracted from the steam-air heat exchanger, and the steam extraction shares of all stages after the steam extraction of the stage are not affected. If the calculation results of the six-stage steam extraction share are negative, the steam quantity returned to the steam recovery system after the heat exchange of the steam-air heat exchanger is enough to exhaust the total air extraction amount of the heat recovery system, and the steam does not need to be extracted from the intermediate pressure cylinder or the low pressure cylinder additionally.
The technical scheme of the utility model is not limited to above-mentioned each embodiment, and the technical scheme that all adopt to equate substitution mode to obtain all falls the utility model discloses the within range that claims.
Claims (10)
1. A coal-fired power plant carbon-based catalysis flue gas desulfurization denitrification facility's regeneration heat source system which characterized in that: comprises a steam system, an air system and a steam recovery system;
the steam system comprises a boiler system and a steam-air heat exchanger, and steam inlets of the boiler system and the steam-air heat exchanger are connected through a reheat steam extraction pipeline;
the air system comprises a carbon-based catalyst regeneration tower heating section and a high-temperature air circulating fan, wherein the high-temperature air circulating fan, the carbon-based catalyst regeneration tower heating section and the steam-air heat exchanger are sequentially connected to form an air circulating loop;
the steam recovery system comprises a main turbine and a turbine regenerative system, the turbine regenerative system comprises a condenser, a low-pressure heater and a deaerator which are sequentially connected, the condenser is connected with the main turbine, and the deaerator is connected with a boiler system; and a steam outlet of the steam-air heat exchanger is respectively connected with the low-pressure heater and the deaerator.
2. The coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device regeneration heat source system of claim 1, wherein: and a steam outlet of the steam air heat exchanger is connected with a steam pressure reducing valve device through a steam discharge pipeline after heat exchange, and an outlet of the steam pressure reducing valve device is respectively connected with the low-pressure heater and the deaerator.
3. The coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device regeneration heat source system of claim 2, wherein: the steam recovery system further comprises a small steam turbine, an outlet of the steam pressure reducing valve device is connected with the small steam turbine, and a steam outlet of the small steam turbine is connected with the condenser.
4. The coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device regeneration heat source system of claim 3, wherein: the steam-air heat exchanger is connected with a reheat steam pipeline of the boiler system.
5. The coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device regeneration heat source system of claim 4, wherein: and a shaft seal heater is arranged between the condenser and the low-pressure heater.
6. The coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device regeneration heat source system of claim 5, wherein: and a water pump is arranged between the condenser and the shaft seal heater.
7. The coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device regeneration heat source system of claim 6, wherein: and a high-pressure heater is arranged between the deaerator and the boiler.
8. The coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device regeneration heat source system of claim 7, wherein: and a water pump is arranged between the deaerator and the high-pressure heater.
9. The coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device regeneration heat source system of claim 8, wherein: the low-pressure heaters are four and are sequentially connected, and the deaerator and the four low-pressure heaters extract steam of a medium-pressure cylinder or a low-pressure cylinder of the main steam turbine.
10. The coal-fired power plant carbon-based catalytic flue gas desulfurization and denitrification device regeneration heat source system of claim 9, wherein: the high pressure heater is provided with three, and three low pressure heater connects gradually, and three low pressure heater extracts main steam turbine intermediate pressure jar or high-pressure cylinder steam.
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