CN104533551A - Waste heat recovery IGCC (integrated gasification combined cycle) combined heat and power generation central heating system and method - Google Patents
Waste heat recovery IGCC (integrated gasification combined cycle) combined heat and power generation central heating system and method Download PDFInfo
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- CN104533551A CN104533551A CN201410432670.0A CN201410432670A CN104533551A CN 104533551 A CN104533551 A CN 104533551A CN 201410432670 A CN201410432670 A CN 201410432670A CN 104533551 A CN104533551 A CN 104533551A
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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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The invention discloses a waste heat recovery IGCC (integrated gasification combined cycle) combined heat and power generation central heating system and method. The system comprises an air separation unit, a gasification furnace, a gas cooler, a purification plant, a gas turbine, a waste heat boiler, an absorption heat pump and a heat exchanger, which are connected successively. An exhaust smoke outlet of the waste heat boiler is emptied or is connected with a smoke inlet of a smoke condensation heat exchanger; a steam outlet of the waste heat boiler is connected with an inlet of a steam turbine; an exhaust steam outlet of the steam turbine is connected with a steam inlet of a condenser; a circulating water outlet of the condenser is connected with a cooling tower; a low-pressure extracted steam outlet of the steam turbine is divided into three paths, two paths or one path of temperature drop, and heat supply network return water is conveyed to a heat supply network for use after being heated. The invention also provides a central heating method. Clean and efficient IGCC is combined with extracted steam heat supply of the steam turbine, the extracted steam of the steam turbine is used for driving the absorption heat pump, the exhaust steam waste heat of the steam turbine and the smoke waste heat are recycled, and the extracted steam heat of the steam turbine and the recycled waste heat are utilized for central heating. The recovery waste heat IGCC combined heat and power generation central heating system and method have the characteristics of cleanliness, high efficiency, mature technology, high recycled waste heat amount, and capability of recycling smoke condensate water.
Description
Technical field
The invention belongs to cogeneration of heat and power central heat supply technical field, be specifically related to a kind of IGCC thermal power cogeneration central heating system and method for recovery waste heat.
Background technique
In recent years, China has met with serious haze weather manyly, air serious pollution, and urban air pollution index breaks through inspirable particle concentration CLV ceiling limit value, especially Beijing-tianjin-hebei Region.Winter is period happening with increasing frequency of haze weather, illustrates that the formation of haze weather and winter heating have close relationship.In order to control atmosphere pollution, alleviate the harm that serious haze weather causes, government proposes air treating target and corresponding policies and measures.The way of administering comprises cuts down fire coal, improves the supply of clean energy such as electric power, rock gas dynamics; Promotion gas cogeneration replaces coal-fired thermal power coproduction, promotes coal preparing natural gas, the clean transformation of coal fired boiler, renovates arcola comprehensively, coal etc. is fallen apart in reduction rural area.
Rock gas is as a kind of valuable clean energy resource of low-carbon high-efficiency, day by day vigorous in China market demand, how there is the waste phenomenon of rock gas, rock gas also makes heat supply actual cost in the trend of increasing substantially relative to the high price of coal, from domestic, international energy supply situation, Gas Prices still has very large rising space, and therefore, the situation of the cogeneration of heat and power central heat supply based on rock gas can cause city heat supply operating cost and industry cost by increasing.China's primary energy is that master can not change in a suitable rapid lapse of time with coal, and the capacity of installed generator of more than 70% is fossil-fired unit, and consume the coal production about national half, government pays much attention to the development of cogeneration of heat and power central heat supply for a long time.
On July 1st, 2014, new fossil-fuel power plant atmospheric pollutant emission standard starts to perform, and is also referred to as power plant emission standard the tightest since the dawn of human civilization.Therefore, just there is such contradiction, being can not break away to rely on for coal on the one hand, is how coal can utilize more cleanly on the other hand.The environmental-protecting performance of integrated gasification combined cycle for power generation (IGCC) can match in excellence or beauty with Natural Gas-Steam Combined Cycle: the dust that IGCC generates electricity and SO
2effluent concentration is lower than 1mg/m
3, NOx emission concentration is lower than 55mg/m
3, after installing SCR device additional, NOx concentration can lower than 10mg/m
3, the sulphur in coal is with sulphur recovery; The dust of natural gas power and SO
2effluent concentration is about 5mg/m
3, NOx emission concentration is about 36mg/m
3.
IGCC is advanced power generation system Coal Gasification Technology and Gas-steam Combined Cycle combined, and has higher generating efficiency and excellent environmental-protecting performance, IGCC subsequent implementation CO
2trapping energy consumption is lower.IGCC is made up of two large divisions, i.e. gasification part and Gas-steam Combined Cycle part.Gasification part capital equipment has gasification oven, air separation facility, gas purification equipment (comprising sulfur recovery unit) etc.; The capital equipment of Gas-steam Combined Cycle part has gas turbine, exhaust heat boiler, steam turbine etc.The technological process of IGCC is: coal in gasification oven with oxygen and water low-heat value gas (mainly CO+H in gasification reaction becomes
2), after purification, the pollutant such as sulphide, nitride, dust in removing crude-gas, make it to become clean gaseous fuel, enter the combustion chambers burn of gas turbine, then high-temperature gas working medium drives combustion gas turbine work done, and combustion turbine exhaustion then enters exhaust heat boiler heated feed water, produces superheated vapor and drives steam turbine work done.
In IGCC, coal is first converted into coal gas by gasification; Then coal gas removes the pollutants such as sulphur by purification, as required separation of C O
2; Last coal gas is converted to electricity by gas turbine and Steam Combined Cycle.Therefore, for IGCC, Control pollution and discharge are the integrated of inherence with transformation of energy.IGCC can make the energy of more shares in coal realize the conversion of energy by efficient gas turbine cycle, and have effectively achieved the clean and cascade utilization of chemical energy in coal, power supply efficiency is higher than the conventional coal fired power plant of same size 6 ~ 8 percentage points.Meanwhile, owing to using combined cycle generation, water saving can reach 50%.IGCC and CO
2trapping and Plugging Technology Applied is integrated traps carbon before combustion, then by carbon sequestration.Due to the CO in coal gas
2concentration will far away higher than CO in flue gas
2concentration, thus reduces efficiency that trapping brings and to reduce and cost raises, and is to realize coal to generate electricity real, the most most economical approach of near-zero release.IGCC is considered to one of ultra-clean, high effect cleaning coal power generation technology the most promising at present.
The domestic and international pure generating IGCC power station running only has 6 at present, be respectively Tampa, Wabash River power station of the U.S., Dutch Buggenum power station, Spain Puertollano power station, the Nakoso power station of Japan, and Tianjin, the Huaneng Group IGCC Demonstration Station of China.Tianjin, Huaneng Group IGCC Demonstration Station is China seat of honour IGCC Demonstration Station, and the operation in power station indicates that China's Clean Coal Power Generating Technologies achieves important breakthrough.
Investment height is that IGCC promotes one of main difficulty faced at present.If IGCC is developed into thermal power plant unit, change more clean cogeneration of heat and power technology into, and improve the Economy of IGCC by heat supply income; On the other hand, IGCC is in commercialization at present and promotes early stage, is combined with central heat supply if can realize, and the form of electricity determining by heat can ensure the year generating hour number of IGCC, also will improve the Economy of IGCC from these two aspects, the commercialized development for IGCC is provided a strong approach by this.If after carrying out cogeneration of heat and power transformation, then reclaim turbine discharge waste heat and Latent heat, can heating load be increased substantially, improve the Economy of IGCC further, also improve heat supply source capacity simultaneously.
In addition, IGCC is as after the thermal source of thermal power cogeneration central heating system, and itself also has a large amount of waste heats, can be recycled, for heat supply by absorption heat pump.The system waste heat of IGCC is for be mainly divided into two classes, and one is turbine discharge waste heat, and two is fume afterheats.Wherein fume afterheat comprises the sensible heat of flue gas cool-down release, and the latent heat that in flue gas, water vapor condensation is released.Abundant recycling IGCC turbine discharge waste heat and fume afterheat, improve efficiency of energy utilization, realizes water vapour in IGCC flue gas and, as the collection of water resources, significantly reduce water vapour loss in smoke evacuation, simultaneously to the SO absorbed in flue gas
2, the pollutant such as NOx and dust also has certain effect.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, the object of the present invention is to provide a kind of IGCC thermal power cogeneration central heating system and method for recovery waste heat, having clean, efficiently, technology maturation, recovery waste heat amount is large, have recovery condensed water concurrently, significantly reduce the feature of water vapour loss in smoke evacuation.
For reaching above object, the present invention adopts following technological scheme:
An IGCC thermal power cogeneration central heating system for recovery waste heat, comprises the air separation facility 1, gasification oven 2, gas cooler 3, purification plant 4, gas turbine 5 and the exhaust heat boiler 6 that connect successively; The smoke evacuation outlet of described exhaust heat boiler 6 is emptying or be connected with the smoke inlet of flue gas condensing heat exchanger 11, the steam (vapor) outlet of described exhaust heat boiler 6 is connected with the entrance of steam turbine 7, the exhaust vent of described steam turbine 7 is connected with the admission entrance of vapour condenser 8, the circulating water outlet of described vapour condenser 8 is connected with cooling tower 9, the low-pressure pumping steam of described steam turbine 7 delivers to heat supply network user after being heated by heat supply network backwater after exporting and dividing three tunnels, two-way or road cooling.
When to reclaim turbine discharge waste heat and fume afterheat simultaneously, the smoke evacuation outlet of described exhaust heat boiler 6 is connected with the smoke inlet of flue gas condensing heat exchanger 11; When hot water being delivered to heat supply network user after the low-pressure pumping steam outlet point three tunnel coolings of described steam turbine 7, low-pressure pumping steam outlet Zhong mono-tunnel of described steam turbine 7 is connected with the steam inlet of vapour-water heater 14, and the hot water outlet of described vapour-water heater 14 is connected with heat exchange station water-water heat exchanger 15 hot water inlet of heat supply network user; Second tunnel is connected with the steam inlet of absorption heat pump I13, the hot water inlet of absorption heat pump I13 to be exported with the hot water backwater of heat exchange station water-water heat exchanger 15 by the second water pump 17 and is connected, the hot water outlet of absorption heat pump I13 is connected with the cold water inlet of vapour-water heater 14, the cooling water outlet of absorption heat pump I13 is connected with the circulating water outlet of vapour condenser 8 by the first water pump 16, and the cold water inlet of absorption heat pump I13 is connected with the circulating water outlet of vapour condenser 8 by the 4th water pump 19; 3rd tunnel is connected with the steam inlet of absorption heat pump II12, the hot water inlet of absorption heat pump II12 is connected with the hot water outlet of heat exchange station water-water heat exchanger 15 by the second water pump 17, the hot water outlet of absorption heat pump II12 is connected with the cold water inlet of vapour-water heater 14, the cooling water outlet of absorption heat pump II12 is connected with the cooling water inlet of flue gas condensing heat exchanger 11 by the 3rd water pump 18, and the cold water inlet of absorption heat pump II12 is connected with the cooling water outlet of flue gas condensing heat exchanger 11.
From heat supply network backwater side, described absorption heat pump I13 and absorption heat pump II12 is for being arranged in parallel, and namely heat supply network backwater is divided into two-way, simultaneously by absorption heat pump I13 and absorption heat pump II12.
When only Mist heat recovering, the smoke evacuation outlet of described exhaust heat boiler 6 is connected with the smoke inlet of flue gas condensing heat exchanger 11; When hot water being delivered to heat supply network user after the low-pressure pumping steam outlet point two-way cooling of described steam turbine 7, low-pressure pumping steam outlet Zhong mono-tunnel of described steam turbine 7 is connected with the steam inlet of vapour-water heater 14, and the hot water outlet of described vapour-water heater 14 is connected with heat exchange station water-water heat exchanger 15 hot water inlet of heat supply network user; Second tunnel is connected with the steam inlet of absorption heat pump II12, the hot water inlet of absorption heat pump II12 to be exported with the hot water backwater of heat exchange station water-water heat exchanger 15 by the second water pump 17 and is connected, the hot water outlet of absorption heat pump II12 is connected with the cold water inlet of vapour-water heater 14, the cooling water outlet of absorption heat pump II12 is connected with the cold water inlet of flue gas condensing heat exchanger 11 by the 3rd water pump 18, and the cold water inlet of absorption heat pump II12 is connected with the cooling water outlet of flue gas condensing heat exchanger 11.
When only reclaiming turbine discharge waste heat, the smoke evacuation outlet of described exhaust heat boiler 6 is emptying; When hot water being delivered to heat supply network user after the low-pressure pumping steam outlet point two-way cooling of described steam turbine 7, low-pressure pumping steam outlet Zhong mono-tunnel of described steam turbine 7 is connected with the steam inlet of vapour-water heater 14, and the hot water outlet of described vapour-water heater 14 is connected with heat exchange station water-water heat exchanger 15 hot water inlet of heat supply network user; Second tunnel is connected with the steam inlet of absorption heat pump I13, the hot water inlet of absorption heat pump I13 to be exported with the hot water backwater of heat exchange station water-water heat exchanger 15 by the second water pump 17 and is connected, the hot water outlet of absorption heat pump I13 is connected with the cold water inlet of vapour-water heater 14, the cold water inlet of absorption heat pump I13 is connected with the circulating water outlet of vapour condenser 8 by the first water pump 16, and the cold water inlet of absorption heat pump I13 is connected with the circulating water outlet of vapour condenser 8 by the 4th water pump 19.
When to reclaim turbine discharge waste heat and fume afterheat simultaneously, and the low-pressure steam outlet of described steam turbine 7 is when to deliver to heat supply network user after dividing three tunnels coolings by hot water, the method of described system central heat supply, air separation facility 1 produces oxygen, after coal carries out gasification reaction with oxygen and steam in gasification oven 2, removed the sulphide in crude-gas again by purification plant 4 after gas cooler 3 is lowered the temperature, nitride, dust pollution thing becomes clean middle lower calorific value coal gas, enter gas turbine 5 to generate electricity, gas turbine 5 exhaust enters exhaust heat boiler 6 and produces steam driven steam turbine 7 and generate electricity, steam turbine 7 steam discharge enters condensation after vapour condenser 8 and circulating water heat exchange, circulating water is lowered the temperature in cooling tower 9, from steam turbine 7, extract low pressure steam, steam is divided into three tunnels, and a road is used for heating heat supply network backwater in vapour-water heater 14, after reaching assigned temperature, feeds heat-net-pipeline, delivers to heat supply network user, second road steam enters absorption heat pump I13, as the driving source of absorption heat pump I13, steam turbine 7 steam discharge or recirculated cooling water are as the low level heat energy of absorption heat pump I13, under the effect of driving heat source, by heat extraction in high-order thermal source, realize the condensation of steam turbine 7 steam discharge, and by heat recovery in heat supply network backwater, reclaim exhausted spare heat, 3rd road steam enters absorption heat pump II12, as the driving source of absorption heat pump II12, fume afterheat passes through flue gas condensing heat exchanger 11 heat exchange in cooling water, as the low level heat energy of absorption heat pump II12, under the effect of driving heat source, by heat extraction in high-order thermal source, achieve the condensation of water vapour in flue gas cool-down and flue gas, and by heat extraction in heat supply network backwater, reclaimed the water vapour in fume afterheat and flue gas.
When only Mist heat recovering, and the low-pressure steam outlet of described steam turbine 7 is when to deliver to heat supply network user after dividing two-way to lower the temperature by hot water, the method of described system central heat supply, air separation facility 1 produces oxygen, after coal carries out gasification reaction with oxygen and steam in gasification oven 2, removed the sulphide in crude-gas again by purification plant 4 after gas cooler 3 is lowered the temperature, nitride, dust pollution thing becomes clean middle lower calorific value coal gas, enter gas turbine 5 to generate electricity, gas turbine 5 exhaust enters exhaust heat boiler 6 and produces steam driven steam turbine 7 and generate electricity, steam turbine 7 steam discharge enters condensation after vapour condenser 8 and circulating water heat exchange, circulating water is lowered the temperature in cooling tower 9, from steam turbine 7, extract low pressure steam, steam is divided into two-way, and a road is used for heating heat supply network backwater in vapour-water heater 14, after reaching assigned temperature, feeds heat-net-pipeline, delivers to heat supply network user, second road steam enters absorption heat pump II12, as the driving source of absorption heat pump II12, fume afterheat passes through flue gas condensing heat exchanger 11 heat exchange in cooling water, as the low level heat energy of absorption heat pump II12, under the effect of driving heat source, by heat extraction in high-order thermal source, achieve the condensation of water vapour in flue gas cool-down and flue gas, and by heat extraction in heat supply network backwater, reclaimed the water vapour in fume afterheat and flue gas.
When only reclaiming turbine discharge waste heat, and the low-pressure steam outlet of described steam turbine 7 is when to deliver to heat supply network user after dividing two-way to lower the temperature by hot water, the method of described system central heat supply, air separation facility 1 produces oxygen, after coal carries out gasification reaction with oxygen and steam in gasification oven 2, removed the sulphide in crude-gas again by purification plant 4 after gas cooler 3 is lowered the temperature, nitride, dust pollution thing becomes clean middle lower calorific value coal gas, enter gas turbine 5 to generate electricity, gas turbine 5 exhaust enters exhaust heat boiler 6 and produces steam driven steam turbine 7 and generate electricity, steam turbine 7 steam discharge enters condensation after vapour condenser 8 and circulating water heat exchange, circulating water is lowered the temperature in cooling tower 9, from steam turbine 7, extract low pressure steam, steam is divided into two-way, and a road is used for heating heat supply network backwater in vapour-water heater 14, after reaching assigned temperature, feeds heat-net-pipeline, delivers to heat supply network user, second road steam enters absorption heat pump I13, as the driving source of absorption heat pump I13, steam turbine 7 steam discharge or recirculated cooling water are as the low level heat energy of absorption heat pump I13, under the effect of driving heat source, by heat extraction in high-order thermal source, realize the condensation of steam turbine 7 steam discharge, and by heat recovery in heat supply network backwater, reclaim exhausted spare heat.
Compared to the prior art, tool has the following advantages in the present invention:
1, the present invention can adopt the flow process simultaneously reclaiming turbine discharge waste heat and fume afterheat, also can adopt the flow process only reclaiming turbine discharge waste heat or fume afterheat.
2, IGCC and cogeneration of heat and power combine by the present invention, improve the Economy of IGCC by heat supply income, and can ensure by the form of the fixed electricity of heat the hour number that generates electricity in the year of IGCC, will improve the Economy of IGCC from these two aspects.
3, the present invention realizes central heat supply by clean IGCC cogeneration of heat and power, can continue, under the condition using coal, to reach the SO of rock gas thermal power plant unit
2, NOx and dust emission standard, be even better than rock gas thermal power plant unit, avoid the rock gas thermal power plant unit adopting high cost.
4, the present invention is by reclaiming turbine discharge waste heat, excavates the heat supply potentiality of IGCC further, significantly improves efficiency of energy utilization, significantly reduce water consumption in wet cooling tower, or the power consumption of blower fan in air cooling compressor.
5, reclaim IGCC fume afterheat, excavate the heat supply potentiality of IGCC further, increase substantially efficiency of energy utilization, condensation after the water vapour in flue gas, avoid chimney and emit " white cigarette " phenomenon; Reclaim the water vapour in IGCC flue gas, significantly reduce the water usage in IGCC power station.
6, adopt direct contact type flue gas heat-exchange unit to have gas washing effect to flue gas, condensed fluid is to the SO absorbed in flue gas simultaneously
2, the pollutant such as NOx and dust also has certain absorption.
The surrounding city that the present invention can be widely used in that natural gas supply is in short supply, rock gas heat cost is high, urban air pollution is serious, have central heat supply demand.
Accompanying drawing explanation
Fig. 1 is the IGCC thermal power cogeneration central heating system flow chart of embodiment one recovery waste heat.
Fig. 2 is the IGCC thermal power cogeneration central heating system flow chart of embodiment two Mist heat recovering.
Fig. 3 is the IGCC thermal power cogeneration central heating system flow chart that embodiment three reclaims turbine discharge waste heat.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Embodiment one
As shown in Figure 1, the IGCC thermal power cogeneration central heating system of a kind of recovery waste heat of the present embodiment, the IGCC of clean and effective is combined with extracted steam from turbine heat supply, and drive absorption heat pump with extracted steam from turbine, reclaim turbine discharge waste heat and fume afterheat, extracted steam from turbine heat and recovery waste heat is utilized to carry out central heat supply, its central heat supply method is: air separation facility 1 produces oxygen, coal is after gasification oven 2 and oxygen and steam carry out gasification reaction, removed the sulphide in crude-gas again by purification plant 4 after gas cooler 3 is lowered the temperature, nitride, the pollutants such as dust become clean middle lower calorific value coal gas (mainly CO and H
2), enter gas turbine 5 and generate electricity, combustion turbine exhaustion enters exhaust heat boiler 6 and produces steam driven steam turbine 7 and generate electricity, and turbine discharge enters condensation after vapour condenser 8 and circulating water heat exchange, and circulating water is lowered the temperature in cooling tower 9, from steam turbine 7, extract low pressure steam, steam is divided into three tunnels, and a road is used for heating heat supply network backwater in vapour-water heater 14, after reaching assigned temperature, feeds heat-net-pipeline, delivers to heat supply network user, second road steam enters absorption heat pump I13, as the driving source of absorption heat pump I13, steam turbine 7 steam discharge (or recirculated cooling water) is as the low level heat energy of absorption heat pump I13, under the effect of driving heat source, by heat extraction in high-order thermal source, realize the condensation of steam turbine 7 steam discharge, and by heat recovery in heat supply network backwater, reclaim exhausted spare heat, 3rd road steam enters absorption heat pump II12, as the driving source of absorption heat pump II12, fume afterheat passes through flue gas condensing heat exchanger 11 heat exchange in cooling water, as the low level heat energy of absorption heat pump II12, under the effect of driving heat source, by heat extraction in high-order thermal source, achieve the condensation of water vapour in flue gas cool-down and flue gas, and by heat extraction in heat supply network backwater, reclaimed the water vapour in fume afterheat and flue gas.It can be surface-type heat exchanger that flue gas heat-exchange unit can be direct contact type, and direct-contact heat exchanger has gas washing effect, pollutant in flue gas is reached to the effect again removed; In addition, owing to there is wash conditions, NOx oxidation can be carried out in direct-contact heat exchanger, form the high price N ion being easy to remove in water.Absorption heat pump I13 and absorption heat pump II12 is seen as from heat supply network backwater side and is arranged in parallel, and namely heat supply network backwater is divided into two-way, simultaneously by absorption heat pump I13 and absorption heat pump II12.
Embodiment two
As shown in Figure 2, the IGCC thermal power cogeneration central heating system of a kind of recovery waste heat of the present embodiment, its central heat supply method is: air separation facility 1 produces oxygen, coal is after gasification oven 2 and oxygen and steam carry out gasification reaction, and after gas cooler 3 is lowered the temperature, the pollutant such as sulphide, nitride, dust removed by purification plant 4 again in crude-gas becomes clean middle lower calorific value coal gas (mainly CO and H
2), enter gas turbine 5 and generate electricity, combustion turbine exhaustion enters exhaust heat boiler 6 and produces steam driven steam turbine 7 and generate electricity, and turbine discharge enters condensation after vapour condenser 8 and circulating water heat exchange, and circulating water is lowered the temperature in cooling tower 9; From steam turbine 7, extract low pressure steam, steam is divided into two-way, and a road is used for heating heat supply network backwater in vapour-water heater 14, after reaching assigned temperature, feeds heat-net-pipeline, delivers to heat exchange station water-water heat exchanger 15; Second road steam enters absorption heat pump II12, as the driving source of absorption heat pump II12, fume afterheat passes through flue gas condensing heat exchanger 11 heat exchange in cooling water, as the low level heat energy of absorption heat pump II12, under the effect of driving heat source, by heat extraction in high-order thermal source, achieve the condensation of water vapour in flue gas cool-down and flue gas, and by heat extraction in heat supply network backwater, reclaimed the water vapour in fume afterheat and flue gas.
Embodiment three
As shown in Figure 3, the IGCC thermal power cogeneration central heating system of a kind of recovery waste heat of the present embodiment, its central heat supply method is: air separation facility 1 produces oxygen, coal is after gasification oven 2 and oxygen and steam carry out gasification reaction, and after gas cooler 3 is lowered the temperature, the pollutant such as sulphide, nitride, dust removed by purification plant 4 again in crude-gas becomes clean middle lower calorific value coal gas (mainly CO and H
2), enter gas turbine 5 and generate electricity, combustion turbine exhaustion enters exhaust heat boiler 6 and produces steam driven steam turbine 7 and generate electricity, and turbine discharge enters condensation after vapour condenser 8 and circulating water heat exchange, and circulating water is lowered the temperature in cooling tower 9; From steam turbine 7, extract low pressure steam, steam is divided into two-way, and a road is used for heating heat supply network backwater in vapour-water heater 14, after reaching assigned temperature, feeds heat-net-pipeline, delivers to heat exchange station water-water heat exchanger 15; Second road steam enters absorption heat pump I13, as the driving source of absorption heat pump I13, steam turbine 7 steam discharge (or recirculated cooling water) is as the low level heat energy of absorption heat pump I13, under the effect of driving heat source, by heat extraction in high-order thermal source, realize the condensation of steam turbine 7 steam discharge, and by heat recovery in heat supply network backwater, reclaim exhausted spare heat.
Claims (8)
1. an IGCC thermal power cogeneration central heating system for recovery waste heat, is characterized in that: comprise the air separation facility (1), gasification oven (2), gas cooler (3), purification plant (4), gas turbine (5) and the exhaust heat boiler (6) that connect successively; The smoke evacuation outlet of described exhaust heat boiler (6) is emptying or be connected with the smoke inlet of flue gas condensing heat exchanger (11), the steam (vapor) outlet of described exhaust heat boiler (6) is connected with the entrance of steam turbine (7), the exhaust vent of described steam turbine (7) is connected with the admission entrance of vapour condenser (8), the circulating water outlet of described vapour condenser (8) is connected with cooling tower (9), the low-pressure pumping steam of described steam turbine (7) delivers to heat supply network user after being heated by heat supply network backwater after exporting and dividing three tunnels, two-way or road cooling.
2. the IGCC thermal power cogeneration central heating system of a kind of recovery waste heat according to claim 1, it is characterized in that: when to reclaim turbine discharge waste heat and fume afterheat simultaneously, the smoke evacuation outlet of described exhaust heat boiler (6) is connected with the smoke inlet of flue gas condensing heat exchanger (11), when hot water being delivered to heat supply network user after the low-pressure pumping steam outlet point three tunnel coolings of described steam turbine (7), low-pressure pumping steam outlet Zhong mono-tunnel of described steam turbine (7) is connected with the steam inlet of vapour-water heater (14), and the hot water outlet of described vapour-water heater (14) is connected with heat exchange station water-water heat exchanger (15) hot water inlet of heat supply network user, second tunnel is connected with the steam inlet of absorption heat pump I (13), the hot water inlet of absorption heat pump I (13) is connected with the hot water outlet of heat exchange station water-water heat exchanger (15) by the second water pump (17), the hot water outlet of absorption heat pump I (13) is connected with the cold water inlet of vapour-water heater (14), the cold water inlet of absorption heat pump I (13) is connected with the circulating water outlet of vapour condenser (8) by the first water pump (16), the cold water inlet of absorption heat pump I (13) is connected with the circulating water outlet of vapour condenser (8) by the 4th water pump (19), 3rd tunnel is connected with the steam inlet of absorption heat pump II (12), the hot water inlet of absorption heat pump II (12) is connected with the hot water outlet of heat exchange station water-water heat exchanger (15) by the second water pump (17), the hot water outlet of absorption heat pump II (12) is connected with the cold water inlet of vapour-water heater (14), the cooling water outlet of absorption heat pump II (12) is connected with the cold water inlet of flue gas condensing heat exchanger (11) by the 3rd water pump (18), the cold water inlet of absorption heat pump II (12) is connected with the cooling water outlet of flue gas condensing heat exchanger (11).
3. the IGCC thermal power cogeneration central heating system of a kind of recovery waste heat according to claim 2, it is characterized in that: from heat supply network backwater side, described absorption heat pump I (13) and absorption heat pump II (12) are for being arranged in parallel, namely heat supply network backwater is divided into two-way, simultaneously by absorption heat pump I (13) and absorption heat pump II (12).
4. the IGCC thermal power cogeneration central heating system of a kind of recovery waste heat according to claim 1, it is characterized in that: when only Mist heat recovering, the smoke evacuation outlet of described exhaust heat boiler (6) is connected with the smoke inlet of flue gas condensing heat exchanger (11), when hot water being delivered to heat supply network user after the low-pressure pumping steam outlet point two-way cooling of described steam turbine (7), low-pressure pumping steam outlet Zhong mono-tunnel of described steam turbine (7) is connected with the steam inlet of vapour-water heater (14), and the hot water outlet of described vapour-water heater (14) is connected with heat exchange station water-water heat exchanger (15) hot water inlet of heat supply network user, second tunnel is connected with the steam inlet of absorption heat pump II (12), the hot water inlet of absorption heat pump II (12) is connected with the hot water outlet of heat exchange station water-water heat exchanger (15) by the second water pump (17), the hot water outlet of absorption heat pump II (12) is connected with the cold water inlet of vapour-water heater (14), the cooling water outlet of absorption heat pump II (12) is connected with the cold water inlet of flue gas condensing heat exchanger (11) by the 3rd water pump (18), the cold water inlet of absorption heat pump II (12) is connected with the cooling water outlet of flue gas condensing heat exchanger (11).
5. the IGCC thermal power cogeneration central heating system of a kind of recovery waste heat according to claim 1, is characterized in that: when only reclaiming turbine discharge waste heat, and the smoke evacuation outlet of described exhaust heat boiler (6) is emptying, when hot water being delivered to heat supply network user after the low-pressure pumping steam outlet point two-way cooling of described steam turbine (7), low-pressure pumping steam outlet Zhong mono-tunnel of described steam turbine (7) is connected with the steam inlet of vapour-water heater (14), and the hot water outlet of described vapour-water heater (14) is connected with heat exchange station water-water heat exchanger (15) hot water inlet of heat supply network user, second tunnel is connected with the steam inlet of absorption heat pump I (13), the hot water inlet of absorption heat pump I (13) to be exported with the hot water backwater of heat exchange station water-water heat exchanger (15) by the second water pump (17) and is connected, the hot water outlet of absorption heat pump I (13) is connected with the cold water inlet of vapour-water heater (14), the cold water inlet of absorption heat pump I (13) is connected with the circulating water outlet of vapour condenser (8) by the first water pump (16), the cold water inlet of absorption heat pump I (13) is connected with the circulating water outlet of vapour condenser (8) by the 4th water pump (19).
6. adopt the method for system central heat supply described in claim 2, it is characterized in that: air separation facility (1) produces oxygen, after coal carries out gasification reaction with oxygen and steam in gasification oven (2), again by the sulphide in purification plant (4) removing crude-gas after gas cooler (3) cooling, nitride, dust pollution thing becomes clean middle lower calorific value coal gas, enter gas turbine (5) generating, gas turbine (5) exhaust enters exhaust heat boiler (6) and produces steam driven steam turbine (7) generating, steam turbine (7) steam discharge enters condensation after vapour condenser (8) and circulating water heat exchange, circulating water is cooling in cooling tower (9), from steam turbine (7), extract low pressure steam, steam is divided into three tunnels, and a road is used for heating heat supply network backwater in vapour-water heater (14), after reaching assigned temperature, feeds heat-net-pipeline, delivers to heat supply network user, second road steam enters absorption heat pump I (13), as the driving source of absorption heat pump I (13), steam turbine (7) steam discharge or recirculated cooling water are as the low level heat energy of absorption heat pump I (13), under the effect of driving heat source, by heat extraction in high-order thermal source, realize the condensation of steam turbine (7) steam discharge, and by heat recovery in heat supply network backwater, reclaim exhausted spare heat, 3rd road steam enters absorption heat pump II (12), as the driving source of absorption heat pump II (12), fume afterheat passes through flue gas condensing heat exchanger (11) heat exchange in cooling water, as the low level heat energy of absorption heat pump II (12), under the effect of driving heat source, by heat extraction in high-order thermal source, achieve the condensation of water vapour in flue gas cool-down and flue gas, and by heat extraction in heat supply network backwater, reclaimed the water vapour in fume afterheat and flue gas.
7. adopt the method for system central heat supply described in claim 4, it is characterized in that: air separation facility (1) produces oxygen, after coal carries out gasification reaction with oxygen and steam in gasification oven (2), again by the sulphide in purification plant (4) removing crude-gas after gas cooler (3) cooling, nitride, dust pollution thing becomes clean middle lower calorific value coal gas, enter gas turbine (5) generating, gas turbine (5) exhaust enters exhaust heat boiler (6) and produces steam driven steam turbine (7) generating, steam turbine (7) steam discharge enters condensation after vapour condenser (8) and circulating water heat exchange, circulating water is cooling in cooling tower (9), from steam turbine (7), extract low pressure steam, steam is divided into two-way, and a road is used for heating heat supply network backwater in vapour-water heater (14), after reaching assigned temperature, feeds heat-net-pipeline, delivers to heat supply network user, second road steam enters absorption heat pump II (12), as the driving source of absorption heat pump II (12), fume afterheat passes through flue gas condensing heat exchanger (11) heat exchange in cooling water, as the low level heat energy of absorption heat pump II (12), under the effect of driving heat source, by heat extraction in high-order thermal source, achieve the condensation of water vapour in flue gas cool-down and flue gas, and by heat extraction in heat supply network backwater, reclaimed the water vapour in fume afterheat and flue gas.
8. adopt the method for system central heat supply described in claim 5, it is characterized in that: air separation facility (1) produces oxygen, after coal carries out gasification reaction with oxygen and steam in gasification oven (2), again by the sulphide in purification plant (4) removing crude-gas after gas cooler (3) cooling, nitride, dust pollution thing becomes clean middle lower calorific value coal gas, enter gas turbine (5) generating, gas turbine (5) exhaust enters exhaust heat boiler (6) and produces steam driven steam turbine (7) generating, steam turbine (7) steam discharge enters condensation after vapour condenser (8) and circulating water heat exchange, circulating water is cooling in cooling tower (9), from steam turbine (7), extract low pressure steam, steam is divided into two-way, and a road is used for heating heat supply network backwater in vapour-water heater (14), after reaching assigned temperature, feeds heat-net-pipeline, delivers to heat supply network user, second road steam enters absorption heat pump I (13), as the driving source of absorption heat pump I (13), steam turbine (7) steam discharge or recirculated cooling water are as the low level heat energy of absorption heat pump I (13), under the effect of driving heat source, by heat extraction in high-order thermal source, realize the condensation of steam turbine (7) steam discharge, and by heat recovery in heat supply network backwater, reclaim exhausted spare heat.
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