CN100400969C - Heating system of water source heat pump by using remaining heat of condensed steam from power plant - Google Patents

Heating system of water source heat pump by using remaining heat of condensed steam from power plant Download PDF

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Publication number
CN100400969C
CN100400969C CNB2006101128614A CN200610112861A CN100400969C CN 100400969 C CN100400969 C CN 100400969C CN B2006101128614 A CNB2006101128614 A CN B2006101128614A CN 200610112861 A CN200610112861 A CN 200610112861A CN 100400969 C CN100400969 C CN 100400969C
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China
Prior art keywords
heat
water
supply network
heat supply
pump
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CNB2006101128614A
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Chinese (zh)
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CN1959220A (en
Inventor
张世钢
付林
江亿
肖常磊
戴威
孙作亮
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清华大学
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Priority to CNB2006101128614A priority Critical patent/CN100400969C/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

Abstract

A heat supplying system of water source heat pump utilizing condensed steam residual heat is prepared as adding heat net heater, steam leading-in pipe, condensed water leading-out pipe, heat net pump, heat net water supply pipeline, heat net returning water pipeline and heat pump based on original cooling system of power plant, utilizing added system to lead all or partial exhausted steam from steam turbine of power plant to heat net heater then to heat pump set at user location for extracting residual heat out from heat net circulation water and for heating it up to certain temperature as well as for supplying heat to user.

Description

A kind of water source heat pump heat supply system that utilizes power plant's condensing waste heat
Technical field
The present invention relates to a kind of power plant's (comprising steam power plant) condensing waste heat that utilizes as the system and method that low order heat source for heat pump carries out heat supply, belong to the heat power engineering field.
Background technology
One, heat pump techniques
In recent years, along with reaching its maturity and develop of heat pump techniques, various heat pump heat supply technology had obtained general applying in China.Heat pump is that a kind of high potential that utilizes makes heat flow to the device of high-order thermal source from low level heat energy, the heat that heat pump is supplied with (being the heat that high-order thermal source obtains) is the summation of high potential that consumes and the heat of drawing from low level heat energy, therefore adopts heat pump assembly to make full use of low-grade energy and saves high-order energy.
The low level heat energy that heat pump is commonly used has air, water (surface water, underground water), soil etc. at present.
1, air
Air can utilize whenever and wherever possible, its device and use more conveniently, and heat exchanging equipment is harmless, shortcoming: 1) along with the reduction of air themperature, the heat pump temperature difference increases, and efficient reduces, and heating capacity reduces, and the building calorific requirement increases with the reduction of environment temperature; 2) air is flowed through evaporimeter when being cooled, can condensation even frosting at evaporator surface, and frosting increases thermal resistance and air flow resistance; 3) specific heat capacity of air is little, and evaporimeter required air quantity in outside is bigger, makes the volume of heat pump bigger, also causes certain noise.Air source heat pump is adapted at the areas to the south, the Changjiang river and uses.
2, water
Specific heat of water holds big, good heat-transfer, and institute is so that heat transmission equipment is comparatively compact.
1) surface water mainly comprises river, lake water, seawater, municipal sewage etc., major defect: a) user is necessary near the water source: b) investment is higher aspect the processing of water intaking, as removing floating garbage and aquatic organism, preventing that mud from entering, adopting anticorrosive etc.; C) water temperature of Sheng Gaoing may exert an influence to natural, ecological.
2) the phreatic temperature of underground water with season temperature variation less, very favourable to operation of heat pump.This heat-supplying mode at first depends on local enough groundwater resources that whether have; Because the restriction of geologic structure and recharging technique may cause the loss of groundwater resources, underground water water intaking recirculation process is also still undetermined to estimating the long term of ecology in addition, so China has the restriction of a lot of urban areas to use this technology.
3, soil
Soil source heat pump is to be that thermal source, water are the heat pump that carrier carries out heat exchange at closed loop (underground heat exchanger system) with soil.The principal character of soil source heat pump is that its outdoor pipe-line system is to be made of the coil pipe that is embedded in the soil, and this coil pipe in the winter time as thermal source heat-obtaining from soil, after the heat pump lifting, is supplied with the heating user as heat exchanger.Soil source heat pump needs enough pipe laying places, and investment is bigger.
Two, residual heat of electric power plant utilizes technology
Have only about 35% to change electric energy in the fuel combustion gross calorific power of thermal power plant, heat energy more than 60% mainly is lost in the environment by the recirculated cooling water of boiler chimney and turbine condenser, and the waste heat that recirculated cooling water carries away accounts for the wherein overwhelming majority.Condensing-type generating set with a 300MW is an example, and its recirculated cooling water thermal discharge is about 454MW, and list says that in quantity this heat can supply 6,000,000 m approximately 2The usefulness of fabrication heating.But because the energy of this part heat is sampled very low (generally below 50 ℃) and never is utilized, most power plant still are discharged in the natural environment by cooling device or natural rivers, slattern a large amount of low-temperature receiver heats.
Steam power plant utilizes the extracted steam from turbine heat supply, can effectively reduce the cold junction loss of Steam Power Circulation.But steam power plant still has a large amount of waste heats to be discharged into environment by recirculated cooling water in the actual motion, particularly the steam power plant of unit is with fixed attention taken out in employing, even under the maximum in the winter time heat supply operating mode, also must be discharged into environment by recirculated water (generally passing through cooling tower) by some heat, this part heat mainly comprises: the heat of condensation that enters the steam release of condenser, the heat that the hydrophobic cooling of low-pressure heater discharges, hot-well depression heat, the draining system of unit and gland seal system are discharged to the heat of condenser, heat that oil cooler, air cooler etc. discharge or the like.Take out with fixed attention why unit still has the steam that enters condenser under maximum is drawn gas operating mode, be because pass through low pressure (LP) cylinder for the cooling that guarantees low pressure (LP) cylinder must have certain quantity of steam, so that take away the heat that is produced because of the air blast friction loss, the minimum discharge of general low pressure (LP) cylinder is 5~10% of a low pressure (LP) cylinder design discharge.Particularly to big capacity high pressure high temperature turbosets of applying at present and the steam-extracting type heat supply unit that is transformed into by the condensing-type unit, its condenser duty is bigger, and the heat of being taken away by recirculated cooling water by condenser generally accounts for more than 15% of gross energy of input.
This part heat that recirculated cooling water is taken away is used heat fully concerning power plant, generally directly is discharged into environment by cooling tower.If can the efficiency of energy utilization of power plant be improved this part heat recovery, can reduce the cooling water evaporation amount simultaneously, save precious water resource, and reduce heat and steam discharging to environment.But because the temperature of recirculated water lower (20~35 ℃ of general winters) under the normal condition, the requirement that does not reach direct heating will be used its heat supply, must try every possible means suitably to improve its temperature.
Summary of the invention
The purpose of this invention is to provide a kind of is the heat pump heat distribution system of low level heat energy with power plant's condensing waste heat, to solve the low difficult problem that can not be directly used in heat supply of the condensing waste heat Yin Wendu of power plant above-mentioned, also provide a kind of suitable low level heat energy simultaneously for heat pump assembly.
A kind of water source heat pump heat supply system that utilizes power plant's condensing waste heat that the present invention proposes, it is characterized in that: described on the basis of the former cooling system in power plant, increased heat exchangers for district heating 12, steam inlet tube 13, coagulated water fairlead 14, heat net pump 15, heat supply network water supply line 16, heat supply network return piping 17, heat pump assembly 18, wherein heat exchangers for district heating 12 is dividing wall type heat exchangers; Described steam inlet tube 13 1 ends are connected on the power plant steam turbine blast pipe 5, and the other end inserts heat exchangers for district heating 12; The described water fairlead 14 1 that coagulates terminates at the heat exchangers for district heating outlet, and the other end inserts power plant condensation water pipe 6; Described heat supply network water supply line 16 and return piping 17 are connected on the heat supply network recirculated water of heat exchangers for district heating 12 respectively and import and export, heat net pump 15 is connected on heat supply network water supply line 16 or backwater net water supply line 16 or the return piping 17, can be in parallel between heat supply network water supply line 16 and the return piping 17 or the heat pump assembly 18 of connect access all kinds and quantity; Described heat supply network recirculated water absorbs power generator group low-temperature receiver waste heat in heat exchangers for district heating 12 after, be transported to the user place by water supply line 16, heat net pump 15 and return piping 17, locate the low level heat energy of source pump 18 as the user, by heat pump 18 waste heat in the recirculated water is taken out the back and heat up, heating heating agent 19 is realized heat supply.
In above-mentioned water source heat pump heat supply system, described at user side the heat supply network feed pipe and return pipe between dress mix water pump (20), enter evaporator with heat pump after same water that water pump (20) sends here mixes from the recirculated water of feed pipe (16) with mixing, enter the discharge of evaporimeter with increase.
In above-mentioned water source heat pump heat supply system, described in power plant's one side heat supply network water supply line 16 and return piping 17 between bypass line 21 is set, by regulating discharge, the heat supply network circulating water temperature that enters heat exchangers for district heating 12 is controlled within the temperature range of requirement by bypass line 21.
Continuous quickening along with China's rapid economy development and urbanization speed, the domestic city ubiquity the situation that the central heating thermal source can not satisfy the heat demand that increases sharply at present, and newly-built large-scale thermal source investment is high, the construction period is long, draws the strong restriction that is subjected to urban environmental capacity.Power plant's condensing waste heat is compared with source heat pump heat at present commonly used, has that stock number is big, temperature is moderate and stable, helps advantage such as environmental protection.The present invention gets up power plant's condensing UTILIZATION OF VESIDUAL HEAT IN by heat pump techniques owing to adopted above technical scheme, is equivalent to enlarge the heat capacity of power plant not increasing power plant's capacity, not increasing under the situation of local discharging.What carry in the pipe network is low-temperature circulating water, and low to the pipe insulation requirement, radiation loss is little, therefore carries cost lower; The efficient characteristics of heat pump also make the comprehensive energy utilization ratio of this heat-supplying mode be higher than conventional boiler room heat-supplying mode in addition.Enforcement of the present invention can not have a negative impact to the former therrmodynamic system in power plant.
Description of drawings
Fig. 1 is a kind of basic principle schematic of utilizing power plant's condensing waste heat to carry out the system of heat supply as low order heat source for heat pump of the present invention.
Fig. 2 of the present inventionly a kind ofly locates to increase the heating system principle schematic of mixing water pump with power plant's condensing waste heat as low order heat source for heat pump and the user.
Fig. 3 be of the present invention a kind of locate to increase as low order heat source for heat pump and the user with power plant's condensing waste heat mix water pump, in power plant for the heating system principle schematic that increases bypass line between the return pipe.
Among the figure:
1-steam turbine 2-generator 3-condenser
4-steam turbine inlet steam pipe 5-steam turbine blast pipe 6-condensate pipe
7-cooling tower 8-circulating water pool 9-water circulating pump
10-circulating water outlet pipe road 11-recirculated water water return pipeline 12-heat exchangers for district heating
13-steam inlet tube 14-coagulates water fairlead 15-heat net pump
16-heat supply network feed pipe 17-heat supply network return pipe 18-heat pump
19-heating agent 20-mixing water pump 21-bypass pipe
The specific embodiment
The object of the present invention is achieved like this, a kind of system and method that utilizes power plant's condensing waste heat to carry out heat supply as low order heat source for heat pump, on former cooling system basis, power plant, devices such as the heat exchangers for district heating in parallel, heat supply network water supply line and return piping, heat net pump, heat pump have been increased with plant condenser, with turbine exhaust steam in electric power plant all or part of the branch to heat exchangers for district heating, steam discharge condensation heat heating heat supply network recirculated water, steam discharge condenses into condensate water, the condensate water of condensation is delivered to boiler again in former plant condenser, as the feedwater of boiler; After heat supply network recirculated water absorbs heat in heat exchangers for district heating and heats up, be transported to the user place by the heat supply network water supply line by the heat net pump driving, the heat pump assembly that is arranged on the user place takes out the waste heat in the heat supply network recirculated water and intensification back heat supply, heat supply network recirculated water returns heat exchangers for district heating by the heat supply network return piping after the heat release cooling again in user's heat pump, heat absorption is transported to the user after heating up again in heat exchangers for district heating, so circulation endlessly realizes power plant's low-temperature receiver waste heat is used for the purpose of heat supply.
Below in conjunction with accompanying drawing enforcement of the present invention is explained as follows:
In Fig. 1, constitute the typical a kind of cooling system in power plant by condenser 3, circulating water outlet pipe road 10, cooling tower 7, circulating water pool 8, recirculated water water return pipeline 11 and water circulating pump 9, wherein condenser 3 is dividing wall type heat exchangers.Steam from boiler enters steam turbine 1 acting through steam turbine inlet steam pipe 4, drives generator 2 generatings, and exhaust steam enters condenser 3 through steam turbine blast pipe 5, be recycled water quench, condensation heat becomes condensate water, discharges through condensate pipe 6, and finally return boiler, finish a circulation.Recirculated cooling water absorbs condense liberated heat and after heating up of steam in condenser 3, under the driving of water circulating pump 9, enter cooling tower 7 heat releases cooling, heat is discharged into environment, recirculated water after the cooling collects in the circulating water pool 8, under the driving of water circulating pump 9, enter the condenser heat absorption again, finish a circulation.The present invention has increased heat exchangers for district heating 12, steam inlet tube 13, has coagulated water fairlead 14, heat net pump 15, heat supply network water supply line 16, heat supply network return piping 17, heat pump assembly 18 on the basis of above-mentioned circulation, wherein heat exchangers for district heating 12 also is a dividing wall type heat exchanger.Steam inlet tube 13 1 ends are connected on the steam turbine blast pipe 5, and the other end inserts heat exchangers for district heating; Coagulate water fairlead 14 1 and terminate at heat exchangers for district heating 12 outlets, the other end inserts condensate pipe 6; Heat supply network water supply line 16 and return piping 17 are connected on the heat supply network recirculated water of heat exchangers for district heating 12 respectively and import and export, heat net pump 15 is connected on heat supply network water supply line 16 or the return piping 17, can be in parallel between heat supply network water supply line 16 and the return piping 17 or connect and insert the heat pump assembly of various forms and quantity, the heat pump of drawing among Fig. 1 18 is one of them representative.
The course of work of present embodiment is as follows: all or part of of turbine discharge that originally is sent to condenser 3 introduced heat exchangers for district heatings 12 through steam inlet tube 13, turbine discharge is cooled off by heat supply network recirculated water at this, condensation heat becomes condensate water, discharge through coagulating water fairlead 14, and finally return boiler through condensate pipe 6, finish a circulation.Heat supply network recirculated water absorbs condense liberated heat and after heating up of steam in heat exchangers for district heating 12, under the driving of heat net pump 15, be transported to the heat pump 18 at user place by heat supply network water supply line 16, in source pump, turn back to heat exchangers for district heating 12 by return piping 17 again after the heat release cooling, finish circulation.The former cooling system in power plant this moment plays a part to stablize the turbine discharge back pressure, if promptly when the thermal discharge of heat exchangers for district heating 12 during greater than user's total load, the heat supply network circulating water temperature raises, cause steam turbine exhaust pressure to raise, this moment is by adjusting the thermal discharge that increases cooling tower 7, thereby strengthen the condensation number of condenser 3, reduce the condensation heat amount of heat exchangers for district heating 12, thermic load and user's calorific requirement of heat exchangers for district heating 12 are complementary, thereby turbine back pressure is stabilized within the scope of requirement, and vice versa.Heat pump 18 absorbs heat from recirculated water, and heating heating agent 19 carries out heat supply.Under the situation of carrying same heat, heat supply network recirculated water utilize the temperature difference big more (being that heat supply network recirculated water return water temperature is low more), the flow of recirculated water is just more little, pipe network initial cost and conveying energy consumption are also just more little, and heat pump assembly has certain requirement to the discharge of its vaporizer side, therefore for the flow that makes pipe network and heat pump is complementary, as shown in Figure 2, dress mixing water pump 20 between the feed pipe of user side and return pipe.Enter evaporator with heat pump after backwater that water pump 20 sends here mixes from the recirculated water of heat supply network feed pipe 16 with mixing, enter the discharge of evaporimeter with increase.Operation has a negative impact to generating set in the too low meeting of circulating water temperature that some power plant enters condenser, therefore heat supply network recirculated water return water temperature there is certain requirement, this moment can be as shown in Figure 3, between the heat supply network water supply line 16 of power plant's one side and heat supply network return piping 17, bypass line 21 is set, by regulating the discharge in the bypass line 21, the circulating water temperature that enters heat exchangers for district heating is controlled within the temperature range of requirement.
In above embodiment, the former cooling system in power plant also can be the air-cooled type condenser.

Claims (3)

1. water source heat pump heat supply system that utilizes power plant's condensing waste heat, it is characterized in that: at exhaust steam blast pipe (5) by power plant steam turbine, condenser (3), circulating water outlet pipe road (10), cooling tower (7), circulating water pool (8), recirculated water water return pipeline (11), on the basis of the former cooling system in power plant that water circulating pump (9) and power plant condensation water pipe (6) are constituted, increased heat exchangers for district heating (12), steam inlet tube (13), coagulate water fairlead (14), heat net pump (15), heat supply network feed pipe (16), heat supply network return pipe (17), heat pump assembly (18), wherein heat exchangers for district heating (12) is a dividing wall type heat exchanger; Described steam inlet tube (13) one ends are connected on the exhaust steam blast pipe (5) of power plant steam turbine, and the other end inserts heat exchangers for district heating (12); The described water fairlead (14) that coagulates terminates at the heat exchangers for district heating outlet, and the other end inserts power plant condensation water pipe (6); Described heat supply network feed pipe (16) is connected on the heat supply network circulating water outlet of heat exchangers for district heating (12), and described heat supply network return pipe (17) is connected on the heat supply network circulating water intake of heat exchangers for district heating (12); Described heat net pump (15) is connected on heat supply network feed pipe (16) or the heat supply network return pipe (17), in parallel or the access described heat pump assembly (18) of connect between described heat supply network feed pipe (16) and the heat supply network return pipe (17), described heat pump assembly is located at the user place, can be the heat pump assembly (18) of all kinds and quantity; Described heat supply network recirculated water absorbs exhaust steam in steam turbine and condenses behind institute's liberated heat in heat exchangers for district heating (12), be transported to the user place by heat supply network feed pipe (16), heat net pump (15) and heat supply network return pipe (17), low level heat energy as described heat pump assembly (18), by described heat pump assembly (18) waste heat in the recirculated water is taken out the back and heat up, heating heating agent (19) is realized heat supply.
2. water source heat pump heat supply system according to claim 1, it is characterized in that: described heat pump assembly is provided with evaporimeter, dress mixes water pump (20) between the described heat supply network feed pipe (16) of user side and heat supply network return pipe (17), from the recirculated water of heat supply network feed pipe (16) with mix the evaporimeter that enters described heat pump assembly after backwater that water pump (20) sends here mixes, the discharge that enters heat pump assembly with increase.
3. water source heat pump heat supply system according to claim 1, it is characterized in that: between the described heat supply network feed pipe (16) of power plant's one side and heat supply network return pipe (17), bypass line (21) is set, by regulating the discharge by bypass line (21), the heat supply network circulating water temperature that will enter heat exchangers for district heating (12) is controlled within the temperature range of requirement.
CNB2006101128614A 2006-09-06 2006-09-06 Heating system of water source heat pump by using remaining heat of condensed steam from power plant CN100400969C (en)

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CN101881564A (en) * 2010-04-15 2010-11-10 中国电力工程顾问集团华北电力设计院工程有限公司 Cooling device for circulating water system of wet cooling unit
CN102537934A (en) * 2012-01-07 2012-07-04 山东泓奥电力科技有限公司 Intelligent heater utilizing superheat degree of industrial extraction steam

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CN101799207B (en) * 2010-03-05 2012-01-04 清华大学 System and method for recycling waste heat of bath sewage by utilizing absorption heat pump
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CN102537934A (en) * 2012-01-07 2012-07-04 山东泓奥电力科技有限公司 Intelligent heater utilizing superheat degree of industrial extraction steam

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