CN215333028U - IGCC combined heat and power generation system with high thermoelectric ratio - Google Patents
IGCC combined heat and power generation system with high thermoelectric ratio Download PDFInfo
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- CN215333028U CN215333028U CN202121773906.9U CN202121773906U CN215333028U CN 215333028 U CN215333028 U CN 215333028U CN 202121773906 U CN202121773906 U CN 202121773906U CN 215333028 U CN215333028 U CN 215333028U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
Abstract
The utility model discloses an IGCC (integrated gasification combined cycle) combined heat and power generation system with high thermoelectric ratio, which comprises a gasification furnace, a waste heat recovery unit, a desulfurization unit, a synthetic gas modulation unit, a combustion chamber, a turbine, a waste heat boiler, a steam turbine and a peak heater which are connected in sequence; steam, coal and pure oxygen are injected into the gasification furnace; the input end of the waste heat recovery unit is connected with return water of a heat supply network, the output end of the waste heat recovery unit is connected with the input end of the peak heater, and the output end of the peak heater is communicated with the heat supply network for supplying water. The return water of the heat supply network adopts a mode of 'waste heat recovery unit + peak heater' step heating, and the return water of the heat supply network is heated
The loss is less, and the energy consumption is more reasonable.
Description
Technical Field
The utility model belongs to the field of coal gasification combined cycle systems, and relates to an IGCC combined heat and power generation system with a high thermoelectric ratio.
Background
Coal is an important basic energy source in China and also a main source of CO2 emission in China. An Integrated Gasification Combined Cycle (IGCC) is a high-efficiency power generation technology that organically integrates a clean coal gasification technology and a high-efficiency gas-steam combined cycle power generation technology. China builds and puts into production a first set of IGCC demonstration power station with the scale of 25 ten thousand kilowatts in 2012, the design net efficiency is 41%, the environmental protection performance of the actual operation of the power station can reach or even be superior to that of a natural gas combined cycle power station, and the CO2 capture before combustion is implemented on the basis of the IGCC, so that the CO2 capture with low cost can be realized.
The thermal power conversion equipment of the IGCC power generation technology is a gas turbine and a steam turbine, and the power generation capacity of the gas turbine is about 2 times of the power generation capacity of the steam turbine generally. The central heating and cooling process mainly adopts steam to drive heating equipment and refrigerating equipment, and the driving steam needs to be extracted from a steam turbine so as to accord with the principle of energy gradient utilization. For the IGCC power generation technology, the amount of steam which can be extracted from a steam turbine is very limited, the thermoelectric ratio is relatively low, and the potential of the IGCC power generation technology for bearing the functions of central heating and cooling is limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide an Integrated Gasification Combined Cycle (IGCC) combined heat and power generation system with high thermoelectric ratio, wherein the return water of a heat supply network adopts a mode of heating in a cascade mode of a waste heat recovery unit and a peak heater, and the return water of the heat supply network is heated in the process
The loss is less, and the energy consumption is more reasonable.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
an IGCC combined heat and power generation system with high thermoelectric ratio comprises a gasification furnace, a waste heat recovery unit, a desulfurization unit, a synthetic gas modulation unit, a combustion chamber, a turbine, a waste heat boiler, a steam turbine and a peak heater which are connected in sequence;
steam, coal and pure oxygen are injected into the gasification furnace; the input end of the waste heat recovery unit is connected with return water of a heat supply network, the output end of the waste heat recovery unit is connected with the input end of the peak heater, and the output end of the peak heater is communicated with the heat supply network for supplying water.
Preferably, a chilling unit is arranged between the gasification furnace and the waste heat recovery unit.
Further, the chilling unit is connected with a grey water treatment unit.
Preferably, a dust removal unit is arranged between the gasification furnace and the waste heat recovery unit.
Further, the output end of the dust removal unit is connected with the gasification furnace.
Preferably, the desulfurization unit is connected with a sulfur recovery unit.
Preferably, the combustion chamber is connected with a gas outlet of the gas compressor, and a gas inlet of the gas compressor is communicated with the atmosphere.
Preferably, the pure oxygen is generated using a cryogenic air separation system.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, the input end of the waste heat recovery unit is connected with the return water of the heat supply network, the output end of the waste heat recovery unit is connected with the input end of the peak heater, the return water of the heat supply network with lower temperature is sent to the waste heat recovery unit, and the other side of the waste heat recovery unit is saturated synthetic gas with higher temperature, so that the latent heat of water vapor is large, and the heat grade is higher. The heated water of the heat supply network is then sent to a peak heater, and is further heated by the extraction steam of a steam turbine, and after reaching the specified temperature, the water becomes water for the heat supply network and is sent to the urban heat supply network. The return water of the heat supply network adopts a mode of 'waste heat recovery unit + peak heater' step heating, and the return water of the heat supply network is heated
The loss is less, and the energy consumption is more reasonable.
Furthermore, the chilling process converts all high-temperature sensible heat of the crude synthesis gas into medium-low-temperature latent heat, so that the process that the high-temperature sensible heat of the crude synthesis gas is recovered in a waste heat boiler and generates steam to be sent to a steam turbine is avoided, the thermoelectric ratio can be effectively improved, and the heat supply amount is greatly increased. And the high-temperature sensible heat of the crude synthesis gas is completely converted into medium-low-temperature latent heat in the chilling process, single-phase heat exchange can be converted into phase-change heat exchange, the design of a heat exchanger in the waste heat recovery unit is facilitated, the size of the heat exchanger in the waste heat recovery unit is reduced, and the manufacturing cost is reduced. Compared with the waste heat boiler process, the chilling process has the advantages of simple structure and manufacturing process, low manufacturing cost and capability of effectively reducing heat supply cost.
Furthermore, the grey water treatment unit can treat the grey water, so that the environmental pollution caused by direct discharge is avoided.
Furthermore, the output end of the dust removal unit is connected with the gasification furnace, so that the fly ash generated by the dust removal unit can be recycled into the gasification furnace, and the environment pollution caused by the fly ash discharged into the atmosphere is avoided.
Furthermore, the sulfur recovery unit can generate sulfur from the acid gas generated by the desulfurization unit, so that the sulfur is prevented from being discharged into the atmosphere to pollute the environment.
Further, the air compressor can suck air from the atmosphere, the generated high-pressure air is sent into the combustion chamber, and high-temperature flue gas generated after the high-pressure air and the synthesis gas are combusted is sent into the turbine for power generation, so that the combustion effect is improved.
Drawings
FIG. 1 is a schematic diagram of an IGCC combined heat and power generation system with a high heat to power ratio of the present invention.
Wherein: 1-gasification furnace; 2-cryogenic air separation system; 3-a quench unit; 4-a grey water treatment unit; 5-a dust removal unit; 6-a waste heat recovery unit; 7-a desulfurization unit; an 8-sulfur recovery unit; 9-a syngas conditioning unit; 10-a combustion chamber; 11-a compressor; 12-turbine; 13-a waste heat boiler; 14-a steam turbine; 15-spike heater.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the IGCC cogeneration system with high heat-power ratio according to the present invention includes a gasification furnace 1, a chilling unit 3, a dust removal unit 5, a waste heat recovery unit 6, a desulfurization unit 7, a syngas control unit 9, a combustion chamber 10, a turbine 12, a waste heat boiler 13, a steam turbine 14, and a spike heater 15, which are connected in sequence.
The gasification furnace 1 is communicated with water vapor and coal, the gasification furnace 1 is connected with a cryogenic air separation system 2, and the cryogenic air separation system 2 is used for inputting pure oxygen into the gasification furnace 1.
The chilling unit 3 is connected with a grey water treatment unit 4, the raw synthesis gas is chilled and cooled by water in the chilling unit 3, and simultaneously grey water is generated and sent to the grey water treatment unit 4 to be treated, so that the environmental pollution caused by direct discharge is avoided.
The output end of the dust removal unit 5 is connected with the gasification furnace 1, so that the fly ash generated by the dust removal unit 5 can be recycled to the gasification furnace 1, and the pollution to the environment caused by the emission into the atmosphere is avoided.
The desulfurization unit 7 is connected with a sulfur recovery unit 8, and the sulfur recovery unit 8 can generate sulfur from the acidic gas generated by the desulfurization unit 7, so that the environmental pollution caused by the acidic gas discharged into the atmosphere is avoided.
The combustion chamber 10 is connected with an air outlet of an air compressor 11, an air inlet of the air compressor 11 is communicated with the atmosphere, the air compressor 11 can suck air from the atmosphere, generated high-pressure air is sent into the combustion chamber 11, and high-temperature flue gas generated after the high-pressure air and synthesis gas are combusted is sent into a turbine 12 for power generation, so that the combustion effect is improved.
The input end of the waste heat recovery unit 6 is connected with return water of a heat supply network, the output end of the waste heat recovery unit 6 is connected with the input end of the peak heater 15, and the output end of the peak heater 15 is communicated with water supply of the heat supply network; the return water of the heat supply network is sent to the waste heat recovery unit 6 for temperature rise and then sent to the peak heater 15, and after the steam is further heated in the peak heater 15 by the steam turbine 14, the temperature reaches the specified temperature, and the return water becomes the water supply of the heat supply network and is supplied to the heat supply network.
The working process of the IGCC combined heat and power generation system with the high heat-power ratio comprises the following steps:
coal is pretreated to be sent into a gasification furnace 1, a strand of water is used as a raw material of gasification reaction and is sent into the gasification furnace 1, the coal is gasified and reacted with water and industrial pure oxygen generated by a cryogenic air separation system 2 in the gasification furnace 1 to generate crude synthesis gas, and ash generated in the gasification process is discharged from the gasification furnace 1. The raw synthesis gas is quenched and cooled in the quench unit 3 by water, while grey water is produced, which is fed to a grey water treatment unit 4.
The chilling process converts all high-temperature sensible heat of the crude synthesis gas into medium-low-temperature latent heat, so that the process that the high-temperature sensible heat of the crude synthesis gas is recovered in a waste heat boiler and steam is generated and sent to a steam turbine 14 is avoided, the thermoelectric ratio can be effectively improved, and the heat supply amount is greatly increased. And the high-temperature sensible heat of the crude synthesis gas is completely converted into medium-low-temperature latent heat in the chilling process, single-phase heat exchange can be converted into phase-change heat exchange, the design of a heat exchanger in the waste heat recovery unit 6 is facilitated, the volume of the heat exchanger in the waste heat recovery unit 6 is reduced, and the manufacturing cost is reduced. Compared with the waste heat boiler process, the chilling process has the advantages of simple structure and manufacturing process, low manufacturing cost and capability of effectively reducing heat supply cost.
The raw synthesis gas is sent to a waste heat recovery unit 6 for cooling after passing through a dust removal unit 5, and fly ash generated by the dust removal unit 5 is recycled to the gasification furnace 1. The cooled synthesis gas is sent to a desulfurization unit 7, the acid gas generated by the desulfurization unit 7 is sent to a sulfur recovery unit 8 to generate sulfur, and the clean synthesis gas generated by the desulfurization unit 7 is diluted by a synthesis gas modulation unit 9 and then sent to a combustion chamber 10 of the gas turbine. A compressor 11 of the gas turbine sucks air from the atmosphere, the generated high-pressure air is sent to a combustion chamber 10 of the gas turbine, and the high-temperature flue gas generated after the synthesis gas is combusted is sent to a turbine 12 of the gas turbine to generate electricity. The flue gas with higher temperature at the outlet of the turbine 12 of the gas turbine is sent to a waste heat boiler 13, and the steam generated by the waste heat boiler 13 is sent to a steam turbine 14 for power generation.
The return water of the heat supply network is sent to the waste heat recovery unit 14 to be heated, and then sent to the peak heater 15, and after the steam is further heated in the peak heater 15 by the steam extraction of the steam turbine 14, the return water reaches the specified temperature, and becomes the water supply of the heat supply network and is supplied to the heat supply network.
The return water of the heat supply network adopts a mode of 'waste heat recovery unit + peak heater' step heating, and the return water of the heat supply network is heated
The loss is less, and the energy consumption is more reasonable.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. An IGCC combined heat and power generation system with high thermoelectric ratio is characterized by comprising a gasification furnace (1), a waste heat recovery unit (6), a desulfurization unit (7), a synthetic gas modulation unit (9), a combustion chamber (10), a turbine (12), a waste heat boiler (13), a steam turbine (14) and a peak heater (15) which are connected in sequence;
steam, coal and pure oxygen are injected into the gasification furnace (1); the input end of the waste heat recovery unit (6) is connected with return water of a heat supply network, the output end of the waste heat recovery unit (6) is connected with the input end of the peak heater (15), and the output end of the peak heater (15) is communicated with the heat supply network for supplying water.
2. An IGCC combined heat and power generation system with a high heat to power ratio according to claim 1, characterized in that a chilling unit (3) is arranged between the gasifier (1) and the waste heat recovery unit (6).
3. An IGCC combined heat and power generation system with high thermoelectric ratio according to claim 2, characterized in that a grey water treatment unit (4) is connected to the chilling unit (3).
4. An IGCC combined heat and power generation system with high heat to power ratio according to claim 1, characterized in that a dust removal unit (5) is arranged between the gasifier (1) and the waste heat recovery unit (6).
5. An IGCC combined heat and power generation system with a high heat and power ratio as claimed in claim 4, characterized in that the output of the dust removal unit (5) is connected with the gasification furnace (1).
6. An IGCC combined heat and power generation system with a high heat to power ratio according to claim 1, characterised in that a sulphur recovery unit (8) is connected to the desulphurisation unit (7).
7. An IGCC combined heat and power generation system with high heat and power ratio as claimed in claim 1, characterized in that the air outlet of the compressor (11) is connected to the combustion chamber (10), and the air inlet of the compressor (11) is communicated with the atmosphere.
8. An IGCC combined heat and power generation system with high heat to power ratio according to claim 1, characterized in that pure oxygen is generated with a cryogenic air separation system (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121773906.9U CN215333028U (en) | 2021-07-30 | 2021-07-30 | IGCC combined heat and power generation system with high thermoelectric ratio |
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| CN202121773906.9U CN215333028U (en) | 2021-07-30 | 2021-07-30 | IGCC combined heat and power generation system with high thermoelectric ratio |
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