Background technology
The present central heating of China has several principal modes such as fire coal/thermo oil boiler heat supply, cogeneration of heat and power.Boiler heat supplying is coal combustion, wet goods preparation of fuel steam or high-temperature-hot-water and gives the user by pipeline supply that because boiler efficiency is low at present, the energy does not have the ladder utilization, causes energy waste, environment is produced pollute, and will be limited by society gradually or eliminate.
The thermoelectricity co-generating heat supplying form, energy is utilized by ladder, and high-order energy is used for generating, and efficient is higher relatively, is present comparatively desirable central heating form.Its operation principle is: the condensing turbine group of drawing gas extracts the high temperature and high pressure steam of certain standard from steam turbine when generating, general pressure is 0.6Mpa, and temperature is about 158 ℃.Steam directly changes 130 ℃ of high-temperature-hot-waters into by steam water heat exchanger and is transported to space heating by pipeline.In this heat supplying process, steam only is used for conducting heat and not acting in heat exchanger, and the calorific value of energy is constant, but steam
Descending, fail to make full use of the matter of steam energy, is the waste that energy is used.
Generally speaking, have only about 22% to change electric energy in the fuel combustion gross calorific power during steam power plant Winter heat supply, about 37% are used for heat supply, and the recirculated cooling water by turbine condenser scatters in the environment more than 30%.This cooling water belongs to low grade heat energy, and is lower because of containing
, can not use by direct heating, wasted in the environment substantially at present, effectively do not recycled.
Summary of the invention
The present invention is a kind of heat supply method that adopts the absorption type heat pump assembly to combine with vapor heat exchanger, the quantity of steam that this system does not change existing steam power plant's installed capacity and provides, and improved its heat capacity, and the heat capacity that increases is equivalent to not consume the heat of steam.
The technical solution used in the present invention is: system and device is by absorption type heat pump assembly, steam power plant, vapour---water-to-water heat exchanger, form by the resident of heat demand or commercial building, flow regulator, various water pump, various pipeline.During heat supply, originally the pressure that was used to enter steam water heat exchanger is 0.6Mpa, temperature is the steam about 158 ℃, by flow regulator, separated into two parts, wherein a part enters steam water heat exchanger, another part enters absorption heat pump, appropriately be used from the acting and two aspects of conducting heat, reasonably utilized the quality and quantity of energy, realized the effective energy.The low-temperature heat source that enters source pump heat dump end is the power plant steam turbine recirculated cooling water, has realized the recycling to used heat.Absorption heat pump radiator end is brought up to 80 ℃ of left and right sides hot water to the heat supply return water temperature, with vapour--and the heat supply backwater of water-to-water heat exchanger mixes, and the heat that provides when reducing steam heat-exchanging so just can prepare the heat supply water about 130 ℃.Hot water to building heat supplying, returns source pump by heat supply pipeline afterwards again, recycles.
In this system, when utilizing enclosed steam turbine recirculated cooling water as low-temperature heat source, the temperature that enters source pump is generally 15 ℃-35 ℃, regulate the unit operating mode, it is consistent with the temperature that enters condenser of power plant former design to make cooling water discharge the back from unit, turn back in the plant condenser, rise again, get back to unit then and continue to recycle through heat absorption back temperature; As when utilizing open type steam turbine recirculated cooling water as low-temperature heat source, the temperature that enters source pump is generally 10 ℃-30 ℃, and cooling water enters its tow taste heat of absorption as much as possible behind the unit, afterwards with cooling-water drain in environment.
Complete concrete technical scheme of the present invention is: relate to steam power plant, steam A, high-temperature-hot-water A, steam turbine circulation cooling water outlet, steam turbine circulation cooling backwater, absorption heat pump, 80 ℃ hot water, heat supply backwater, building or heat supply network, the heat supply backwater, high-temperature-hot-water B, vapour---water-to-water heat exchanger, steam B, return the water of boiler, steam C, high-temperature-hot-water C; Extracting pressure from described steam turbine in thermal power plant is 0.6Mpa, temperature is the steam A about 158 ℃, is divided into two parts by adjusting, and a part of steam C enters absorption heat pump, be used from the acting and two aspects of conducting heat, steam becomes high-temperature-hot-water C and returns boiler afterwards; It is 80 ℃ hot water that source pump rises to temperature to the heat supply backwater, and enters vapour--the heat supply backwater of water-to-water heat exchanger mixes; Another part steam B enters vapour---water-to-water heat exchanger, after the hot water mixing water heat exchange of heat supply backwater and heat pump preparation, become the water that returns boiler, and the high-temperature-hot-water A that mixes with high-temperature-hot-water C behind the general designation release latent heat returns boiler; Vapour---water-to-water heat exchanger is got high-temperature-hot-water B in return and is entered heating network to building that heat demand is arranged or heat supply network heat supply; Power plant steam turbine circulation cooling water outlet enters source pump heat dump end, as the low-temperature heat source of unit, is extracted and becomes steam turbine circulation cooling backwater behind the heat and return the power plant steam turbine condenser or be discharged in the natural environment.
The invention has the beneficial effects as follows and slattern when utilizing steam power plant's part heating steam heat exchange
, lifting recirculated cooling water used heat
, and then promote its grade, be used for mixing by the preparation high-temperature-hot-water with the heat supply backwater.Utilize absorption heat pump, be equivalent to not consume the heat of steam, the Waste Heat Recovery utilization the recirculated cooling water that emits by cooling tower or natural water increases considerably area of heat-supply service, and society is produced huge economy and dynamogenetic value.
Description of drawings
The present invention will be further described below in conjunction with Figure of description 1.
Fig. 1 is a systematic schematic diagram of the present invention.
1. steam power plants among Fig. 1,2. steam A, 3. high-temperature-hot-water A, 4. water outlet, 5. steam turbine circulation cooling backwater, 6. absorption heat pump are cooled off in the steam turbine circulation, 7.80 ℃ hot water, 8. heat supply backwater, 9. building or heat supply network, 10. heat supply backwater, 11. high-temperature-hot-water B, 12. vapour---water-to-water heat exchanger, 13. steam B, 14. return the water of boiler, 15. steam C, 16. high-temperature-hot-water C.
The specific embodiment
In Fig. 1, during heat supply, extracting pressure from steam power plant's 1 steam turbine is 0.6Mpa, temperature is the steam A2 about 158 ℃, is divided into two parts by adjusting, and a part of steam C15 enters absorption heat pump 6, be used from the acting and two aspects of conducting heat, rationally utilize can quality and quantity, realize the effective energy, steam becomes high-temperature-hot-water C 16 and returns boiler afterwards.It is 80 ℃ hot water 7 that source pump rises to temperature to heat supply backwater 8, and enters vapour--the heat supply backwater 10 of water-to-water heat exchanger mixes; Another part steam B13 enters vapour---water-to-water heat exchanger 12, after the hot water mixing water heat exchange of heat supply backwater and heat pump preparation, become the water 14 that returns boiler, and the high-temperature-hot-water A3 that mixes with high-temperature-hot-water C 16 behind the general designation release latent heat returns boiler.Vapour---water-to-water heat exchanger is got high-temperature-hot-water B11 in return and is entered heating network to building that heat demand is arranged or heat supply network 9 heat supplies; Power plant steam turbine circulation cooling water outlet 4 enters source pump heat dump end, low-temperature heat source as unit, be extracted and become steam turbine circulation cooling backwater 5 behind the heat and return the power plant steam turbine condenser or be discharged in the natural environment, realized recycling used heat.