CN102589035B - Energy-saving heat pump and co-generation coupled heating system and coupled heating method - Google Patents
Energy-saving heat pump and co-generation coupled heating system and coupled heating method Download PDFInfo
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Abstract
The invention discloses an energy-saving heat pump and a co-generation coupled heating system and a coupled heating method, belonging to the field of energy sources. The system is composed of a steam turbine, a steam-turbine condensing plant, steam-turbine circulation cooling equipment, a steam-absorption heat pump, a heat network heater, a coupler, a heat-exchange station, corresponding pipelines and accessory equipment. The system utilizes the heat pump and the co-generation heat network heater to heat circulating water of a heat network, the heat pump uses circulating cooling water of a generating plant as a low-temperature heat source, the extracted steam of the steam turbine is utilized as a driving heat source, and the heat of the circulating cooling water is extracted to heat the circulating water of the heat network. The water yield and temperature of water from the heat pump and water from the heat network heater are distributed and adjusted through the coupler, and the heating temperature and the rate of flow in a full heating season are qualified. According to the method, a peak heater is cancelled, so the occupied area and the investment are reduced. The heat pump can have basic heat load, the residual heat is extracted to the maximum extent, the heating capacity is increased, the economical efficiency of the heat pump is maximized, and the purposes of energy saving and emission reduction are achieved.
Description
Technical field
The invention belongs to energy field, particularly a kind of energy-conservation heat pump and cogeneration of heat and power coupling heating system and coupling heat supply method.
Technical background
Source pump can consume a small amount of heat, extracts the heat of low-temperature heat source, thereby obtains the more heat supply heat of heat of specific consumption, has considerable economy.The source pump advantage that especially steam flooding ejector half source pump has in Thermal Power Station is a lot, and 1. the driving steam of source pump can utilize drawing gas of steam turbine in Thermal Power Station, and it is convenient to obtain; 2. power plant's condensing equipment has a large amount of low temperature exhaust heats, can be used as the high-quality low-temperature heat source of source pump; 3. Thermal Power Station, with a large amount of thermic loads, can meet the basic load requirement of source pump.Adopt source pump to carry out heat supply, the heat that can extract low-temperature heat source carries out heat supply, reduces the amount of drawing gas of steam turbine, expands area of heat-supply service, greatly improves the economy of heat supply unit.But source pump heat supply has unsurmountable defect, feasible supply water temperature is not high, is difficult to meet the heat request that supplies for hot season freeze-up, must increase the heat supply temperature requirement of spike heat exchangers for district heating guarantee freeze-up.But peak load calorifier capacity is large, to take up an area and invest corresponding greatlyr, year utilization rate is extremely low; The heat-supplying mode of this source pump and peak load calorifier simultaneously, most of the time underrun in source pump Heating Season, waste heat can not fully be reclaimed, and heating system heat-economy is very low, and energy-saving and emission-reduction are not thorough.
Traditional co-generation unit is simple, and heat supply temperature adjustable range is large, entirely all can meet heat supply hot water temperature's requirement for the hot season.But be subject to the impact of the minimum displacement of steam turbine, the amount of drawing gas still has a large amount of turbine discharges to enter condensing equipment when maximum, wastes a large amount of waste heats, and thermal loads can not expand simultaneously.
Source pump and cogeneration of heat and power coupling heat supply, can bring into play feature separately, extracts waste heat with heat pump, expands area of heat-supply service.Heat supply network water supply flow and thermic load can be allocated between source pump and cogeneration of heat and power heater simultaneously, can realize the adjusting requirement of water supply flow and temperature, can ensure again heat pump band basic load, and the economy of heat supply is maximized.Can cancel heat pump peak load calorifier, reduce floor space, reduce investment and operation maintenance workload.Can realize energy-saving and emission-reduction maximizes.
Summary of the invention
The object of the invention is to propose a kind of energy-conservation heat pump and cogeneration of heat and power coupling heating system and coupling heat supply method.
A kind of heat pump and cogeneration of heat and power coupling heating system, it is characterized in that, system is made up of steam turbine, steam turbine condensing equipment, steam turbine cycle cooling device, steam absorption heat pump, coupler, heat exchangers for district heating, two secondary heat exchange stations and corresponding pipeline and auxiliary device; System composition form is as follows: boiler 1 is connected by pipeline with steam turbine 2, and the steam discharge of steam turbine 2 connects steam turbine condensing equipment 3; The recirculated water water outlet of steam turbine condensing equipment 3 connects circulating water equipment 4 by pipeline and steam is received suction source pump 9, and the recirculated water backwater of circulation cooling device 4 and source pump 9 is connected to steam turbine condensing equipment 3 via water circulating pump 14; Drawing gas of steam turbine 2 connects respectively steam receipts suction source pump 9 and heat exchangers for district heating 5 by pipeline; The backwater at the first secondary heat exchange station 6 is connected to heat exchangers for district heating 5 through heat supply network water return pipeline via the first circulation pump of heat-supply network 12, and the water outlet of heat exchangers for district heating 5 is connected to coupled system 8 through piping; The backwater at the second secondary heat exchange station 10 is connected to source pump 9 through heat supply network water return pipeline via the second circulation pump of heat-supply network 13, and the water out that supplies of source pump 9 is connected to coupled system 8 through pipeline; Coupled system water outlet is divided into two-way, is connected respectively to the first secondary heat exchange station 6 and the second secondary heat exchange station 10; The first secondary heat exchange station 6 is connected by pipeline with the first hot user 7, and the second secondary heat exchange station 10 is connected by pipeline with the second hot user 11; Flow equilibrium valve 8-8 is connected to the arrival end of the first circulation pump of heat-supply network 12 and the second circulation pump of heat-supply network 13, and the circling water flow rate of coupled system is carried out to flow equilibrium.
Described coupled system water outlet is divided into two-way water channel, and the first via is heater side water channel, connects into water channel by heater side entrance valve 8-4, coupler 8-1 and heater side outlet valve 8-5, and is furnished with heater side bypass valve 8-2; The second tunnel is heat pump side water channel, connects into water channel by heat pump side entrance valve 8-6, coupler 8-1 and heat pump side outlet valve 8-7, and is furnished with heat pump side bypass valve 8-3.
Coupler distributes district 8-1-5, fluid mixed zone 8-1-6, first via discharge connection 8-1-2 and the second way outlet to take over 8-1-4 by first via inlet connection 8-1-1, the second road inlet connection 8-1-3, fluid and forms.Mainly complete distribution and the immixture of fluid, and reduce flow resistance, increase mixing uniformity.Inlet connection has 2 tunnels at least, and discharge connection has 1 tunnel at least.
Described coupled system is the heater side entrance valve 8-4 being connected with heat exchangers for district heating 5 and the heat pump side entrance valve 8-6 being connected with source pump is jointly connected to coupled system, and connect each secondary heat exchange station via coupled system, the arrival end that heat supply network water return pipeline is connected to the first circulation pump of heat-supply network 12 and the second circulation pump of heat-supply network 13 again forms, and arrival end arranges flow equilibrium pipeline and valve.
The coupling heat supply method of a kind of heat pump and cogeneration of heat and power coupling heating system, it is characterized in that, the coupling heat supply of described heat pump and cogeneration of heat and power coupling heating system refers to that first the heat supply network water supply of heat pump heat supply and traditional thermoelectricity co-generating heat supplying enter coupled system, in coupled system, carry out after the adjustment of flow and temperature, then deliver to heat supply network and carry out heat supply; The specific works flow process of coupling heat supply method is as follows: the steam of boiler 1 enters steam turbine 2 and does work; Steam turbine 2 steam discharges enter condensing equipment 3 and are condensed into condensed water, liberated heat Heating Cyclic cooling water, a recirculated cooling water part enters source pump 9 as low-temperature heat source, after being extracted heat by source pump 9, reduce temperature, remaining recirculated cooling water enters cooling system 4 and lowers the temperature, recirculated water after source pump 9 and cooling system 4 are lowered the temperature converges, and sends into condensing equipment 3 after water circulating pump 14 boosts.Drawing gas of steam turbine 2 enters heat exchangers for district heating 5, and the condensed water that heat release forms after condensing reclaims, and condensation liberated heat heats the heat supply network recirculated water of being sent here by the first circulation pump of heat-supply network 12, and the heat supply network recirculated water after heating enters coupled system 8; Drawing gas of steam turbine 2 enters source pump 9 as driving steam, emit and be condensed into water after heat and reclaim, the heat of heat pump output heats the heat supply network recirculated water of being sent here by the second circulation pump of heat-supply network 13, is entered coupled system 8 by the heat supply network recirculated water after heat pump; The first circulation pump of heat-supply network 12 is sent into water that heat exchangers for district heating 5 heats and the second circulation pump of heat-supply network 13 and is sent into the water that source pump 9 heats and be coupled, and after coupling, flow and temperature meet for after heat request, are transported to each heat exchange station via heat-net-pipeline; Have two-way heat-net-pipeline, the first secondary heat exchange station 6 is delivered on a road, and the second secondary heat exchange station 10 is delivered on another road; Heat is sent to first hot user's 7 heating by the first secondary heat exchange station 6, and heat is sent to second hot user's 11 heating by the second secondary heat exchange station 10.This method key feature is that the water supply of heater 5 and source pump 9 enters coupled system simultaneously, two plume amounts are redistributed flow and are adjusted after temperature in coupled system, deliver to again each heat exchange station, hot net water flow and thermic load can be allocated between initial station heater and source pump, and circling water flow rate balance pipe and valve 8-8 thereof that backwater arranges in coupled system carry out flow equilibrium; Ensure on the one hand the normal of full Heating Season heat supply network water supply flow and temperature, can realize source pump band basic load at whole Heating Season on the other hand, maximize and extract waste heat, expand heat capacity, reduce heater steam consumption simultaneously and improve generating capacity, realize maximized economy and energy-saving and emission-reduction.
Described coupled system is connected to coupled system jointly by the heater side entrance valve 8-4 being connected with heat exchangers for district heating 5 and the heat pump side entrance valve 8-6 that is connected with source pump, and being connected to each secondary heat exchange station via coupled system, heat supply network water return pipeline is connected to the arrival end of the first circulation pump of heat-supply network 12 and the second circulation pump of heat-supply network 13 again; Backwater balance pipe carries out flow equilibrium to heat supply network backwater, realizes mixing and the distribution function of coupled system to heat supply network backwater.
The invention has the beneficial effects as follows: the present invention has traditional thermoelectricity co-generating heat supplying and two kinds of heat-supplying modes of heat pump heat supply, by the coupling of two kinds of heat-supplying modes, can bring into play both advantages, compensation is not enough separately, realize whole Heating Season heat supply hot net water flow and the allotment of thermic load between cogeneration of heat and power heater and source pump, can make source pump band basic load, cogeneration of heat and power band peakload, maximize and extract power plant waste heat, meet water supply flow and temperature in the full adjusting requirement supplying in the hot season, can cancel the peak load calorifier of source pump, save floor space, reduce investment outlay and operation maintenance workload, realize the cascade utilization of energy, improve the heat-economy of Steam Turbine and heating system thereof, reach the effect of energy-saving and emission-reduction.
Brief description of the drawings
Fig. 1 is a kind of heat pump and cogeneration of heat and power coupling heating system structure form schematic diagram.
Fig. 2 is heat pump and the cogeneration of heat and power coupling heating system structure form schematic diagram of simplifying coupled system.
Fig. 3 is coupler structure schematic diagram.
Detailed description of the invention
The present invention proposes a kind of energy-conservation heat pump and cogeneration of heat and power coupling heating system and coupling heat supply method.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1
Fig. 1 is a kind of heat pump and cogeneration of heat and power coupling heating system structure form schematic diagram, this system adopts the way of realization of two heat supply network heat supplies, comprises steam turbine, steam turbine condensing equipment, steam turbine cycle cooling device, steam absorption heat pump, heat exchangers for district heating, secondary heat exchange station and corresponding pipeline and auxiliary device composition.
Boiler 1 is connected by pipeline with steam turbine 2, and the steam discharge of steam turbine 2 connects steam turbine condensing equipment 3; The recirculated water water outlet of steam turbine condensing equipment 3 connects circulating water equipment 4 by pipeline and steam is received suction source pump 9, and the recirculated water backwater of circulation cooling device 4 and source pump 9 is connected to steam turbine condensing equipment 3 via water circulating pump 14; Drawing gas of steam turbine 2 connects respectively steam receipts suction source pump 9 and heat exchangers for district heating 5 by pipeline; The backwater at the first secondary heat exchange station 6 is connected to heat exchangers for district heating 5 through heat supply network water return pipeline via the first circulation pump of heat-supply network 12, and the water outlet of heat exchangers for district heating 5 is connected to coupled system 8 through piping; The backwater at the second secondary heat exchange station 10 is connected to source pump 9 through heat supply network water return pipeline via the second circulation pump of heat-supply network 13, and the water out that supplies of source pump 9 is connected to coupled system 8 through pipeline; Coupled system water outlet is divided into two-way, is connected respectively to the first secondary heat exchange station 6 and the second secondary heat exchange station 10; The first secondary heat exchange station 6 is connected by pipeline with the first hot user 7, and the second secondary heat exchange station 10 is connected by pipeline with the second hot user 11; Flow equilibrium valve 8-8 is connected to the arrival end of the first circulation pump of heat-supply network 12 and the second circulation pump of heat-supply network 13, and the circling water flow rate of coupled system is carried out to flow equilibrium.
Described coupled system water outlet is divided into two-way water channel, and the first via is heater side water channel, connects into water channel by heater side entrance valve 8-4, coupler 8-1 and heater side outlet valve 8-5, and is furnished with heater side bypass valve 8-2; The second tunnel is heat pump side water channel, connects into water channel by heat pump side entrance valve 8-6, coupler 8-1 and heat pump side outlet valve 8-7, and is furnished with heat pump side bypass valve 8-3.
Fig. 3 is coupler structure schematic diagram, and in figure, coupler distributes 8-1-6 first via discharge connection 8-1-2 the second way outlet adapter 8-1-4 in district 8-1-5 fluid mixed zone to form by first via inlet connection 8-1-1 the second road inlet connection 8-1-3 fluid.Mainly complete distribution and the immixture of fluid, and reduce flow resistance, increase mixing uniformity.More than inlet connection can have 2 tunnels, discharge connection can have 1 tunnel and more than.
Shown in Fig. 2, be heat pump and the cogeneration of heat and power coupling heating system structure form schematic diagram of simplifying coupled system.This system adopts the way of realization of single heat supply network heat supply, comprises steam turbine, steam turbine condensing equipment, steam turbine cycle cooling device, steam absorption heat pump, heat exchangers for district heating, heat exchange station and corresponding pipeline and auxiliary device composition.In figure, the structure of coupled system is the heater side entrance valve 8-4 being connected with heat exchangers for district heating 5 and the heat pump side entrance valve 8-6 being connected with source pump is jointly connected to coupled system, and connecting each secondary heat exchange station through coupled system, heat supply network water return pipeline is connected to the arrival end of the first circulation pump of heat-supply network 12 and the second circulation pump of heat-supply network 13 again; Remainder is identical with Fig. 1.
The heat supply network recirculated water of being sent here by circulation pump of heat-supply network 12, the heat supply network recirculated water after heating enters coupled system 8; The drawing gas of steam turbine 2 enters source pump 9 as driving steam, emits to be condensed into water after heat and to reclaim, and the heat of heat pump output heats the heat supply network recirculated water of being sent here by circulation pump of heat-supply network 12, is entered coupled system 8 by the heat supply network recirculated water after heat pump; Coupled system supplies water initial station heater and heat pump supplies water is coupled, and after coupling, flow and temperature meet for after heat request, deliver to the first secondary level heat exchange station 6, the first secondary heat exchange stations 6 heat is sent to first hot user's 7 heating via heat-net-pipeline.In the time that heater side entrance valve 8-4 and heat pump side entrance valve 8-6 open simultaneously, heat pump and thermoelectricity co-generating heat supplying can be realized coupling heat supply; When heater side entrance, valve 8-4 opens, and heat pump side entrance valve 8-6 is while closing, the independent heat supply of cogeneration of heat and power; When heater side entrance, valve 8-4 closes, and heat pump side entrance valve 8-6 is while opening, the independent heat supply of source pump.Single heat supply network backwater can omit backwater equalizing main and valve thereof.
Claims (2)
1. a coupling heat supply method for heat pump and cogeneration of heat and power coupling heating system, described heat pump and cogeneration of heat and power coupling heating system are connected to form by corresponding pipeline by steam turbine, steam turbine condensing equipment, steam turbine cycle cooling device, steam absorption heat pump, coupler, heat exchangers for district heating and heat exchange station; Concrete composition structure is as follows: boiler (1) is connected by pipeline with steam turbine (2), and the steam discharge of steam turbine (2) connects steam turbine condensing equipment (3); The recirculated water water outlet of steam turbine condensing equipment (3) connects circulating water equipment (4) by pipeline and steam is received suction source pump (9), and the recirculated water backwater of circulating water equipment (4) and source pump (9) is connected to steam turbine condensing equipment (3) via water circulating pump (14); Drawing gas of steam turbine (2) connects respectively steam receipts suction source pump (9) and heat exchangers for district heating (5) by pipeline; The backwater at the first secondary heat exchange station (6) is connected to heat exchangers for district heating (5) through heat supply network water return pipeline via the first circulation pump of heat-supply network (12), and the water outlet of heat exchangers for district heating (5) is connected to coupled system (8) through piping; The backwater at the second secondary heat exchange station (10) is connected to source pump (9) through heat supply network water return pipeline via the second circulation pump of heat-supply network (13), and the water out that supplies of source pump (9) is connected to coupled system (8) through pipeline; Coupled system water outlet is divided into two-way, is connected respectively to the first secondary heat exchange station (6) and the second secondary heat exchange station (10); The first secondary heat exchange station (6) is connected by pipeline with the first hot user (7), and the second secondary heat exchange station (10) is connected by pipeline with the second hot user (11); Flow equilibrium valve (8-8) is connected to the arrival end of the first circulation pump of heat-supply network (12) and the second circulation pump of heat-supply network (13), and the circling water flow rate of coupled system is carried out to flow equilibrium, realizes energy-saving and emission-reduction;
It is characterized in that, the coupling heat supply of described heat pump and cogeneration of heat and power coupling heating system refers to that first the heat supply network water supply of heat pump heat supply and traditional thermoelectricity co-generating heat supplying enter coupled system, in coupled system, carry out after the adjustment of flow and temperature, then deliver to heat supply network and carry out heat supply, the specific works flow process of coupling heat supply method is as follows: the steam of boiler (1) enters steam turbine (2) acting, steam turbine (2) steam discharge enters condensing equipment (3) and is condensed into condensed water, liberated heat Heating Cyclic cooling water, a recirculated cooling water part enters source pump (9) as low-temperature heat source, after being extracted heat by source pump (9), reduce temperature, remaining recirculated cooling water enters cooling system (4) and lowers the temperature, recirculated water after source pump (9) and circulating water equipment (4) are lowered the temperature converges, after boosting, water circulating pump (14) sends into condensing equipment (3), drawing gas of steam turbine (2) enters heat exchangers for district heating (5), the condensed water that heat release forms after condensing reclaims, condensation liberated heat heats the heat supply network recirculated water of being sent here by the first circulation pump of heat-supply network (12), heat supply network recirculated water after heating enters coupled system (8), drawing gas of steam turbine (2) enters source pump (9) as driving steam, emit and be condensed into water after heat and reclaim, the heat of heat pump output heats the heat supply network recirculated water of being sent here by the second circulation pump of heat-supply network (13), is entered coupled system (8) by the heat supply network recirculated water after heat pump, the first circulation pump of heat-supply network (12) is sent into water that heat exchangers for district heating (5) heats and the second circulation pump of heat-supply network (13) and is sent into the water that source pump (9) heats and be coupled, after coupling, flow and temperature meet for after heat request, are transported to each heat exchange station via heat-net-pipeline, have two-way heat-net-pipeline, the first secondary heat exchange station (6) is delivered on a road, and the second other secondary heat exchange station (10) is delivered on another road, heat is sent to the first hot user (7) heating by the first secondary heat exchange station (6), and heat is sent to the second hot user (11) heating by the second secondary heat exchange station (10), this method key feature is that the water supply of heat exchangers for district heating (5) and source pump (9) enters coupled system simultaneously, two plume amounts are redistributed flow and are adjusted after temperature in coupled system, deliver to again each heat exchange station, hot net water flow and thermic load can be allocated between heat exchangers for district heating and source pump, and the circling water flow rate balance pipe arranging in coupled system and valve (8-8) thereof carry out flow equilibrium to backwater, ensure on the one hand the normal of full Heating Season heat supply network water supply flow and temperature, can realize source pump band basic load at whole Heating Season on the other hand, maximize and extract waste heat, expand heat capacity, reduce heater steam consumption simultaneously and improve generating capacity, realize energy-saving and emission-reduction.
2. the coupling heat supply method of a heat pump and cogeneration of heat and power coupling heating system, it is characterized in that, the heat supply network of its heat exchangers for district heating (5) supplies water and supplies water and enter coupled system (8) from heat pump side entrance valve (8-6) simultaneously from the heat supply network of heater side entrance valve (8-4) and source pump, water outlet is transported to each heat exchange station by heat-net-pipeline, and heat supply network backwater carries out flow equilibrium by backwater balance pipe; Coupler (8-1) is set in coupled system, to improve performance, or only formed by pipeline valve, coupled system has mixing and the distribution function to heat supply network backwater current, has ensured on the one hand the normal of full Heating Season heat supply network water supply flow and temperature, can realize source pump band basic load at whole Heating Season on the other hand, maximize and extract waste heat, expand heat capacity, reduce heater steam consumption simultaneously and improve generating capacity, realize energy-saving and emission-reduction.
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| CN103162547A (en) * | 2013-03-23 | 2013-06-19 | 山西易通环能科技集团有限公司 | Method and device of generating power using sintering kiln tail gas low-temperature waste heat |
| CN105258204B (en) * | 2015-09-30 | 2019-03-01 | 华电电力科学研究院 | The hot water Supply Method and system that the first kind is coupled with second-kind absorption-type heat pump |
| CN105823259A (en) * | 2016-05-18 | 2016-08-03 | 中国大唐集团科学技术研究院有限公司 | Circulating water waste heat recycling system for thermal power plant heat supply unit |
| EP3273168A1 (en) * | 2016-07-19 | 2018-01-24 | E.ON Sverige AB | Method for controlling heat transfer between a local cooling system and a local heating system |
| CN107504548A (en) * | 2017-09-18 | 2017-12-22 | 江苏中圣管道工程技术有限公司 | A kind of steam-water mixing central heating system |
| CN108870504A (en) * | 2018-07-28 | 2018-11-23 | 西安西热节能技术有限公司 | A kind of cogeneration units level of factory heat supply network recirculated water water admixing device |
| CN110186098A (en) * | 2019-06-28 | 2019-08-30 | 天津华能杨柳青热电有限责任公司 | A kind of mixed water temperature equalization system of cogeneration units supplying hot water |
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