CN105201573A - Back pressure turbine heat supply and energy storage system and heat supply and energy storage method thereof - Google Patents
Back pressure turbine heat supply and energy storage system and heat supply and energy storage method thereof Download PDFInfo
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- CN105201573A CN105201573A CN201510598656.2A CN201510598656A CN105201573A CN 105201573 A CN105201573 A CN 105201573A CN 201510598656 A CN201510598656 A CN 201510598656A CN 105201573 A CN105201573 A CN 105201573A
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Abstract
The invention discloses a back pressure turbine heat supply and energy storage system and a heat supply and energy storage method thereof, relates to a heat supply and energy storage system of a thermal power plant, and particularly relates to a back pressure turbine heat supply steam and rear-mounted back pressure turbine energy storage system. The back pressure turbine heat supply and energy storage system comprises a back pressure turbine heat supply sub-system and an energy storage sub-system, wherein the back pressure turbine heat supply sub-system comprises a boiler, a heat supply back pressure turbine, a small steam-driven pump turbine, a low pressure deaerator, a water supply pump, a standby water supply pump, a high pressure heater, a continuous blowdown flash tank, an intermittent blowdown flash tank and a temperature-decreased pressure reducer; the energy storage sub-system comprises an energy storage back pressure turbine, a cold water tank, a hot water tank, a steam water heater, an automatic water supply controller, a hot water pump and a cold water pump; in a heat load valley, the excess supplied heat of the heat supply back pressure turbine is stored in the hot water tank through the energy storage system; in a heat load peak, hot water in the hot water tank is supplied in a heat supply back pressure turbine regenerative system, the steam amount of the heat supply back pressure turbine exhaust steam heating regenerative system is decreased, and the external heat supply amount is increased.
Description
Technical field
The heat supply energy-storage system of what the heat supply of a kind of back pressure machine of the present invention, energy-storage system and heat supply energy storage method thereof related to is a kind of thermoelectricity plant, especially a kind of back pressure machine heating steam adds rearmounted back pressure machine energy-storage system.
Background technique
The heating system of conventional thermoelectric factory back pressure machine mainly comprises back pressure machine and the temperature-decreased pressure reducer that puts into operation.The heat supply of thermoelectricity plant's back pressure machine is by back pressure machine directly externally heat supply, and when exceeding the heating load of back pressure machine, put into operation temperature-decreased pressure reducer heat supply; When heat load is less than the rated heating capacity of back pressure machine, back pressure machine under-capacity operation.
Thermoelectricity plant's heat user with heat along with heat user heat produces order of classes or grades at school, production Rate of load condensate and have larger change season, each heat user 24 hours is all different by heat substantially, when heat user has 2 classes to make and 3 classes are processed, more obvious by thermal change.
When adopting temperature-decreased pressure reducer to run, this part heating steam does not have cogeneration of heat and power, uneconomical; During back pressure machine under-capacity operation, depart from back pressure machine design conditions, back pressure machine exhaust temperature is raised, internal efficiency reduces, and reduces the Economy of back pressure machine.Also there is no the special energy-storage system for back pressure machine at present.
Summary of the invention
The object of the invention is to provide a kind of back pressure machine heat supply, energy-storage system and heat supply energy storage method thereof for above-mentioned deficiency, former heat supply back pressure machine heating system basis increases energy storage back pressure machine, hot water tank and automatic controller, when heat load low ebb, the unnecessary heating load of heat supply back pressure machine, by this energy-storage system, is stored in hot water tank; When heat load peak, the feedwater entering heat supply back pressure machine heat regenerative system is the hot water in hot water tank, reduces the steam consumption of heat supply back pressure machine steam discharge heating heat regenerative system, increases external heating load.
The present invention takes following technological scheme to realize:
A kind of back pressure machine heat supply, energy-storage system comprise back pressure machine for thermal sub-system and energy storage subtense angle;
Described back pressure machine comprises boiler, heat supply back pressure machine, the little steam turbine of pneumatic pump, low pressure oxygen-eliminating device, feed water pump, auxiliary feed water pump, high-pressure heater, continuous blowdown flash tank, regular unloading container and temperature-decreased pressure reducer for thermal sub-system; The steam ouput of boiler is connected with the main inlet throttle-stop valve import of heat supply back pressure machine by main steam line; The exhaust vent of heat supply back pressure machine is divided into two-way, and a road is connected with the heat supply mouth of pipe, and another road, after the little steam turbine of pneumatic pump, is connected with low pressure oxygen-eliminating device; The low pressure feed water end of low pressure oxygen-eliminating device is connected with inlet of high pressure heater with auxiliary feed water pump by feed water pump; The hot water outlet of high-pressure heater is connected with the water intake of boiler, and the hot water through high-pressure heater sends into boiler economizer, and the sewage draining exit of boiler is connected with continuous blowdown flash tank; Continuous blowdown flash tank sewage draining exit is connected with regular unloading container, the sewer access regular unloading container in continuous blowdown flash tank.
Described energy storage subtense angle comprises energy storage back pressure machine, cold-water tank, hot water tank, steam water heater and feedwater automatic controller, hot water pump, water supply pump; The steam inlet of steam water heater is connected with the exhaust steam pipe of heat supply back pressure machine; The demineralized water chemically come between waterwheel and cold water one tunnel are connected with the cold water interface of steam water heater, the hot water outlet of steam water heater is connected with hot water tank water intake, described cold water is stored in hot water tank after steam water heater heating, and the demineralized water chemically come between waterwheel and another road of cold water are connected with the water inlet of cold-water tank; The water outlet of cold-water tank is connected through the cold water end of water supply pump with feedwater automatic controller, the cold water of cold-water tank enters feedwater automatic controller, the water outlet of hot water tank is connected through the hot water end of hot water pump with feedwater automatic controller, hot water is sent into feedwater automatic controller, the cold water of cold-water tank and the hot water of hot water tank, by feedwater automatic controller, regulate the entering water temp entering Back-heating System of Heat Power Plant automatically; Feedwater automatic controller is connected with the feed-water inlet end of Back-heating System of Heat Power Plant;
The steam inlet of energy storage back pressure machine is connected with the exhaust steam pipe of heat supply back pressure machine; The steam-expelling port of energy storage back pressure machine is connected with the vapor interface of the steam water heater of energy-storage system; Steam water heater hot water outlet end is connected with hot water tank.The demineralized water chemically come between waterwheel and cold water are divided into two-way, one tunnel is connected with the cold water interface of steam water heater, the steam discharge of cold water and energy storage back pressure machine steam-expelling port is stored in hot water tank after steam water heater Hybrid Heating, and the demineralized water chemically come between waterwheel and another road of cold water are connected with cold-water tank; The water outlet of cold-water tank is connected with the cold water end of feedwater automatic controller, and the cold water of cold-water tank enters feedwater automatic controller; The water outlet of hot water tank is connected with the hot water end of feedwater automatic controller, hot water is sent into feedwater automatic controller; The cold water of cold-water tank and the hot water of hot water tank, by feedwater automatic controller, regulate the entering water temp entering Back-heating System of Heat Power Plant automatically; Feedwater automatic controller is connected with the feed-water inlet end of Back-heating System of Heat Power Plant.
Feedwater automatic controller controls feedwater outlet temperature, and its working principle is: when the rated heating capacity of heat supply back pressure machine when extraneous heat load is greater than its feed temperature 95 DEG C, and feed temperature controls at 95 DEG C by feedwater automatic controller; When heat supply back pressure machine is less than the rated heating capacity of its feed temperature 20 DEG C (ambient temperatures) in extraneous heat load, feed temperature controls at 20 DEG C by feedwater automatic controller; Heat supply back pressure machine is when extraneous heat load is less than the rated heating capacity of its feed temperature 95 DEG C and is greater than the rated heating capacity of its feed temperature 20 DEG C, according to heat supply back pressure machine thermodynamic properties, in feedwater automatic controller, set the oepration at full load of heat supply back pressure machine and mate the feed temperature of extraneous heat load, and hot water and the cool water quantity of feedwater automatic controller is entered according to this set value calculation, reach this setting value, make the specified operation at full capacity of heat supply back pressure machine.
The heat supply energy storage method of back pressure machine heat supply, energy-storage system comprises the steps:
1) initial steam that back pressure machine produces for the boiler of thermal sub-system delivers to the main inlet throttle-stop valve import of heat supply back pressure machine by main steam line; Steam one tunnel after heat supply back pressure machine enters heat supply pipeline, enters low pressure oxygen-eliminating device after the little steam turbine of pneumatic pump of separately leading up to; By the low pressure feed water end of low pressure oxygen-eliminating device after feed water pump and auxiliary feed water pump, deliver to high-pressure heater; Hot water through high-pressure heater sends into boiler economizer, and the sewer of boiler enters regular unloading container after continuous blowdown flash tank;
2) when heat load low ebb, back pressure machine enters energy storage back pressure machine, energy storage back pressure machine steam discharge for the steam discharge part of thermal sub-system, is stored in hot water tank after 20 DEG C of (ambient temperature) demineralized waters of being come in chemical water workshop by steam water heater are heated to 95 DEG C;
3) when heat load peak, energy storage back pressure machine is out of service, and feedwater automatic controller cuts out cold water end interface, and the water now entering thermodynamic system is 95 DEG C of demineralized waters in hot water tank, reduce the steam flow that heat supply back pressure machine is used for backheat, improve the external heating load of heat supply back pressure machine;
4) when heat load non-peak or low ebb, close energy storage back pressure machine, feedwater automatic controller connects hot water end and cold water end interface, the water controlling to enter thermodynamic system is between 20 DEG C-90 DEG C, the displacement of heat supply back pressure machine is made automatically to adapt to extraneous heat load, reach the oepration at full load of heat supply back pressure machine, improve calorific efficiency of heat power station and economic benefit.
In described step 2) in, feedwater automatic controller hot water end interface is closed, and the water entering thermodynamic system is 20 DEG C of (ambient temperature) demineralized waters in cold-water tank, increases the steam flow that heat supply back pressure machine is used for backheat, reduces the external heating load of heat supply back pressure machine.
Advantage of the present invention: present system increases energy storage back pressure machine, hot water tank, cold-water tank, steam water heater and feedwater automatic controller on former back pressure machine heating system basis, when heat load low ebb, the heating load of heat supply back pressure machine, by this energy-storage system, is stored in hot water tank.When heat load peak, the specified operation of heat supply back pressure machine, the feedwater entering heat supply back pressure machine heat regenerative system is the hot water in hot water tank, reduces the steam consumption of heat supply back pressure machine steam discharge heating heat regenerative system, increases external heating load.For the thermoelectricity plant that China is numerous, especially have the thermoelectricity plant of many pure back pressure machines, the amplitude of variation of heat load is larger.For the call that response national energy-saving reduces discharging, actively control the coal-fired total amount of thermoelectricity plant, improve the operational efficiency of thermoelectricity plant's back pressure machine, back pressure machine heating steam energy-storage system has very large application value.
Accompanying drawing explanation
Below with reference to accompanying drawing, the present invention is further described:
Fig. 1 is back pressure machine heat supply of the present invention, energy-storage system schematic diagram.
Fig. 2 is heat load plotted curve of typical day in the specific embodiment of the invention-summer;
Fig. 3 is heat load plotted curve of typical day in the specific embodiment of the invention-winter.
In Fig. 1: 1, boiler, 2, heat supply back pressure machine, 3, the little steam turbine of pneumatic pump, 4, low pressure oxygen-eliminating device, 5, feed water pump, 6, auxiliary feed water pump, 7, high-pressure heater, 8, continuous blowdown flash tank, 9, regular unloading container, 10, temperature-decreased pressure reducer, 11, energy storage back pressure machine, 12, hot water tank, 13, cold-water tank, 14, steam water heater, 15, feedwater automatic controller, 16, water supply pump, 17, hot water pump.
Embodiment
With reference to accompanying drawing 1, a kind of back pressure machine heat supply of the present invention, energy-storage system comprise back pressure machine for thermal sub-system and energy storage subtense angle;
Described back pressure machine comprises boiler 1, heat supply back pressure machine 2, the little steam turbine 3 of pneumatic pump, low pressure oxygen-eliminating device 4, feed water pump 5, auxiliary feed water pump 6, high-pressure heater 7, continuous blowdown flash tank 8, regular unloading container 9 and temperature-decreased pressure reducer 10 for thermal sub-system; The steam ouput of boiler 1 is connected with the main inlet throttle-stop valve import of heat supply back pressure machine 2 by main steam line; The exhaust vent of heat supply back pressure machine 2 is divided into two-way, and a road is connected with the heat supply mouth of pipe, and another road, after the little steam turbine 3 of pneumatic pump, is connected with low pressure oxygen-eliminating device 4; The low pressure feed water end of low pressure oxygen-eliminating device 4 is connected with high-pressure heater 7 import with auxiliary feed water pump 6 by feed water pump 5; The hot water outlet of high-pressure heater 7 is connected with the water intake of boiler 1, and the hot water through high-pressure heater 7 sends into boiler economizer, and the sewage draining exit of boiler 1 is connected with continuous blowdown flash tank 8; Continuous blowdown flash tank 8 sewage draining exit is connected with regular unloading container 9, the sewer access regular unloading container 9 in continuous blowdown flash tank 8.
Described energy storage subtense angle comprises energy storage back pressure machine 11, cold-water tank 13, hot water tank 12, steam water heater 14 and feedwater automatic controller 15, hot water pump 17, water supply pump 16; The demineralized water chemically come between waterwheel and cold water one tunnel are connected with the cold water interface of steam water heater 14, the hot water outlet of steam water heater 14 is connected with hot water tank 12 water intake, described cold water is stored in hot water tank 12 after steam water heater 14 heats, and the demineralized water chemically come between waterwheel and another road of cold water are connected with the water inlet of cold-water tank; The water outlet of cold-water tank 13 is connected through the cold water end of water supply pump 16 with feedwater automatic controller 15, the cold water of cold-water tank 13 enters feedwater automatic controller 15, the water outlet of hot water tank 12 is connected with feedwater automatic controller 15 hot water end through hot water pump 17, hot water is sent into feedwater automatic controller 15, the cold water of cold-water tank 13 and the hot water of hot water tank 12, by feedwater automatic controller 15, regulate the entering water temp entering Back-heating System of Heat Power Plant automatically; Feedwater automatic controller 15 is connected with the feed-water inlet end of Back-heating System of Heat Power Plant;
The steam inlet of energy storage back pressure machine 11 is connected with the exhaust steam pipe of heat supply back pressure machine 2; The steam-expelling port of energy storage back pressure machine 11 is connected with the vapor interface of the steam water heater 14 of energy-storage system; Steam water heater 14 hot water outlet end is connected with hot water tank 12.The demineralized water chemically come between waterwheel and cold water are divided into two-way, one tunnel is connected with the cold water interface of steam water heater 14, the steam discharge of cold water and energy storage back pressure machine 11 steam-expelling port is stored in hot water tank 12 after steam water heater 14 Hybrid Heating, and the demineralized water chemically come between waterwheel and another road of cold water are connected with cold-water tank 13; The water outlet of cold-water tank 13 is connected with the cold water end of feedwater automatic controller 15, and the cold water of cold-water tank 13 enters feedwater automatic controller 15; The water outlet of hot water tank 12 is connected with the hot water end of feedwater automatic controller 15, hot water is sent into feedwater automatic controller 15; The cold water of cold-water tank 13 and the hot water of hot water tank 12, by feedwater automatic controller 15, regulate the entering water temp entering Back-heating System of Heat Power Plant automatically; Feedwater automatic controller 15 is connected with the feed-water inlet end of Back-heating System of Heat Power Plant.
Feedwater automatic controller 15 pairs of feedwater outlet temperature control, and its working principle is: when the rated heating capacity of heat supply back pressure machine 2 when extraneous heat load is greater than its feed temperature 95 DEG C, feed temperature controls at 95 DEG C by feedwater automatic controller 15; When heat supply back pressure machine 2 is less than the rated heating capacity of its feed temperature 20 DEG C (ambient temperatures) in extraneous heat load, feed temperature controls at 20 DEG C by feedwater automatic controller 15; Heat supply back pressure machine 2 is when extraneous heat load is less than the rated heating capacity of its feed temperature 95 DEG C and is greater than the rated heating capacity of its feed temperature 20 DEG C, according to heat supply back pressure machine thermodynamic properties, in feedwater automatic controller 15, set the oepration at full load of heat supply back pressure machine and mate the feed temperature of extraneous heat load, and hot water and the cool water quantity of feedwater automatic controller 15 is entered according to this set value calculation, reach this setting value, make the specified operation at full capacity of heat supply back pressure machine.
The heat supply energy storage method of back pressure machine heat supply, energy-storage system comprises the steps:
1) initial steam that back pressure machine produces for the boiler 1 of thermal sub-system delivers to the main inlet throttle-stop valve import of heat supply back pressure machine 2 by main steam line; Steam one tunnel after heat supply back pressure machine 2 enters heat supply pipeline, enters low pressure oxygen-eliminating device 4 after the little steam turbine 3 of pneumatic pump of separately leading up to; By the low pressure feed water end of low pressure oxygen-eliminating device 4 after feed water pump 5 and auxiliary feed water pump 6, deliver to high-pressure heater 7; Hot water through high-pressure heater 7 sends into boiler economizer, and the sewer of boiler 1 enters regular unloading container 9 after continuous blowdown flash tank 8;
2) when heat load low ebb, back pressure machine enters energy storage back pressure machine 11 for the steam discharge part of thermal sub-system, energy storage back pressure machine 11 steam discharge, is stored in hot water tank 12 after 20 DEG C of (ambient temperature) demineralized waters of being come in chemical water workshop by steam water heater 14 are heated to 95 DEG C;
3) when heat load peak, energy storage back pressure machine 11 is out of service, and feedwater automatic controller 15 cuts out cold water end interface, and the water now entering thermodynamic system is 95 DEG C of demineralized waters in hot water tank 12, reduce the steam flow of heat supply back pressure machine 2 for backheat, improve heat supply back pressure machine 2 externally heating load;
4) when heat load non-peak or low ebb, close energy storage back pressure machine 11, feedwater automatic controller 15 connects hot water end and cold water end interface, the water controlling to enter thermodynamic system is between 20 DEG C-90 DEG C, the displacement of heat supply back pressure machine 2 is made automatically to adapt to extraneous heat load, reach heat supply back pressure machine 2 oepration at full load, improve calorific efficiency of heat power station and economic benefit.
In described step 2) in, feedwater automatic controller 15 hot water end interface is closed, and the water entering thermodynamic system is 20 DEG C of (ambient temperature) demineralized waters in cold-water tank 13, increases the steam flow of heat supply back pressure machine 2 for backheat, reduces the external heating load of heat supply back pressure machine 2.
With reference to accompanying drawing 2 ~ 3, because back pressure machine size, parameter kind are a lot, the present invention only illustrates with the heat load of Yongxing thermoelectricity plant and back pressure machine, and for other thermoelectricity plants and back pressure machine, it is in different size, but principle is the same.
The feature of Yongxing thermoelectricity plant heat supply back pressure machine and heat load is: the maximum heating load in summer and winter is all greater than the maximum heating load of heat supply back pressure machine 2; The minimum thermal load in summer and winter is all less than the rated heating capacity of heat supply back pressure machine 2.
When the rated generation power of heat supply back pressure machine 2 be 18MW, steam discharge 1.1MPa, 285.5 DEG C, to enter thermodynamic system be 20 DEG C of demineralized waters time, external heating load 160.38t/h;
When the rated generation power of heat supply back pressure machine 2 be 18MW, steam discharge 1.1MPa, 285.5 DEG C, to enter thermodynamic system be 95 DEG C of demineralized waters time, external heating load 180.43t/h;
Enter heat regenerative system feed temperature when bringing up to 95 DEG C (hot water tank hot water temperature) by 20 DEG C (ambient temperatures), the specified external heating load of heat supply back pressure machine 2 can increase 20.05t/h.
Concrete theory calculate example:
Back pressure machine heat supply of the present invention, energy-storage system, both energy storage back pressure machine can be adopted, also energy storage back pressure machine (switching flexibly) can not be adopted, heat load data are the Yongxing thermoelectricity plant actual heating load curve of 2014, the data of heat supply back pressure machine are the back pressure machine data of the existing unit of Yongxing thermoelectricity, and energy storage back pressure machine data are back pressure machine data that Hangzhou steam turbine plant provides.
(1) when, back pressure machine heat supply of the present invention, energy-storage system employing energy storage back pressure machine, when night shift, the steam discharge part of heat supply back pressure machine 1 enters energy storage back pressure machine 2, energy storage back pressure machine 2 steam discharge, and 20 DEG C of demineralized waters of being come by sweet-water tank are heated to 95 DEG C and are stored in hot water tank 12; When heat load peak (day shift), energy storage back pressure machine 2 is out of service, and the water entering thermodynamic system is 95 DEG C of demineralized waters in hot water tank, reduces the steam flow of heat supply back pressure machine 1 for backheat, improves the external heating load of heat supply back pressure machine 1.
According to thermoelectricity plant's summer and winter heat load characteristic curve, select energy storage back pressure machine.The characteristic parameter of energy storage back pressure unit be admission 1.1MPa, 285.5 DEG C, steam discharge 0.15MPa, 111.4 DEG C (Hang Qichang provides data).
The determination principle of energy storage back pressure machine throttle flow and power: the necessary hot water of heating load on daytime, by energy-storage system, is all heated to 95 DEG C.
Adopt energy storage back pressure machine, hot water tank heating steam adopts energy storage back pressure machine steam discharge, and heat Balance Calculation result is:
1, during night shift in summer heat load low ebb, the necessary hot water of heating heating load on daytime, needs energy storage back pressure machine back pressure steam discharge 0.15MPa, 111.4 DEG C of (actual exhaust temperature about 123 DEG C) steam flow is 41.75t/h in evening, generated output 3107kw.
Thermoelectricity plant's whole day temperature-decreased pressure reducer heat supply is between 0-44.57t/h, and heat supply back pressure machine operate power is 18MW, thermoelectricity plant's external heating load of each hour and extraneous heat load completely the same; Thermoelectricity plant's whole day boiler load fluctuation is between 198.36-241.64t/h, and amplitude is 43.28t/h.
2, during night shift in winter heat load low ebb, the necessary hot water of heating heating load on daytime, needs energy storage back pressure machine back pressure steam discharge 0.15MPa, 111.4 DEG C of steam flow is 55.19t/h in evening, generated output 4462kw.
Thermoelectricity plant's whole day temperature-decreased pressure reducer heat supply between 0-69.57t/h, the specified operation 18MW of heat supply back pressure machine, thermoelectricity plant's external heating load of each hour and extraneous heat load completely the same; Thermoelectricity plant's whole day boiler load fluctuation is between 203.14-259.12t/h, and amplitude is 55.98t/h.
3, option and installment increases little back pressure machine newly is 4.5MW, both can specified operation in the winter time, also can at summer operation.
(2), back pressure machine heat supply of the present invention, in energy-storage system, also energy storage back pressure machine can not be adopted.When not adopting energy storage back pressure machine, when night shift (heat load low ebb), heat supply back pressure machine 1 steam discharge, 20 DEG C of demineralized waters of being come by sweet-water tank are heated to 95 DEG C and are stored in hot water tank 12; When day shift (heat load peak), the water entering thermodynamic system is 95 DEG C of demineralized waters in hot water tank 12, reduces the steam flow of heat supply back pressure machine 1 for backheat, improves the external heating load of heat supply back pressure machine 1.
Do not adopt energy storage back pressure machine, when hot water tank heating steam adopts the steam discharge of heat supply back pressure machine, heat Balance Calculation result is:
1, during night shift in summer heat load low ebb, the necessary hot water of heating heating load on daytime, needs steam discharge 1.1MPa, 285.5 DEG C of steam flow is 37.49t/h.The heat supply of thermoelectricity plant's whole day whole day in summer temperature-decreased pressure reducer is between 0-44.57t/h, and back pressure machine operate power is between 17-18MW, thermoelectricity plant's external heating load of each hour and extraneous heat load completely the same; Thermoelectricity plant's whole day boiler load fluctuation is between 199.48-237.32t/h, and amplitude is 37.84t/h.
2, during night shift in winter heat load low ebb, the necessary hot water of heating heating load on daytime, needs steam discharge 1.1MPa, 285.5 DEG C of steam flow is 49.56t/h.Temperature-decreased pressure reducer heat supply between 0-89.62t/h, the specified operation 18MW of back pressure machine, thermoelectricity plant's external heating load of each hour and extraneous heat load completely the same; Thermoelectricity plant's whole day boiler load fluctuation is between 203.14-357.94t/h, and amplitude is 154.8t/h.
Do not adopt energy storage back pressure machine, after enforcement, the substantially specified operation of heat supply back pressure machine, also reduces the fluctuation that boiler load runs, and improves unit operation efficiency.
(3) 2 scheme economic indicator comparison sheets, before and after energy storage
In back pressure machine heat supply of the present invention, energy-storage system, adopt energy storage back pressure machine and do not adopt energy storage back pressure machine to see the following form with the Economic contrast without energy-storage system:
Data display in above-mentioned table, adopts the energy-storage system of energy storage back pressure machine good in economic efficiency, obvious energy conservation.
(4) other effects of, back pressure machine heat supply, energy-storage system
1, boiler operatiopn:
Before energy storage, summer, the steam output of boiler ran between 145.79-314.76t/h, and winter, the steam output of boiler ran between 171-357.9t/h, and boiler load fluctuation is comparatively large, and height load difference is 169-187t/h, and combustion adjustment is difficult and frequent;
After energy storage, the steam output in boiler summer runs between 198.4-241.6t/h, and winter, the steam output of boiler ran between 203.1-259.1t/h, and boiler load fluctuation reduces, and height load difference is 43.2-56t/h, runs very steady, and is easy to adjustment;
2, original heat supply back pressure machine runs: before energy storage, the generated output of heat supply in summer back pressure machine runs between 11522-18000kw, and heat supply back pressure machine exhaust temperature fluctuates between 285.5-302.8 DEG C; The generated output of Winter heat supply back pressure machine runs between 14176-18000kw, and heat supply back pressure machine exhaust temperature fluctuates between 285.5-295.8 DEG C.Back pressure machine fluctuation of load, when low-load, exhaust temperature raises, and Economy declines;
After energy storage, the generated output of heat supply in summer back pressure machine is the generated output of 17466-18000kw and Winter heat supply back pressure machine is rated power 18000kw, heat supply back pressure machine exhaust temperature is rated steam exhaust temperature 285.5 DEG C substantially, the annual basic rated load operation of heat supply back pressure machine, fluctuate very little, Economy significantly improves.
3, after energy-storage system is arranged, in energy-storage system, system feedwater automatic controller is set, by thermodynamic system feed temperature between 20-95 DEG C, fluctuation with extraneous heat load adjusts automatically (can in regulation range 20-95 DEG C of heating load), makes the specified operation of back pressure machine.
4, the setting of back pressure machine heating steam energy-storage system, makes the annual stable operation of thermal power plant boiler and the annual basic rated load operation of original heat supply back pressure machine, while raising Economy, is very easy to the operation of thermoelectricity plant.
5, the prerequisite of the annual basicly stable operation of thermal power plant boiler and the annual rated load operation of original heat supply back pressure machine is the increase in back pressure machine heating steam energy-storage system, when being configured with energy storage back pressure machine, energy storage back pressure machine is in night shift (during heat load low ebb) oepration at full load; On day shift (during heat load peak), energy storage back pressure machine is out of service.Back pressure machine heating steam energy-storage system serves the effect regulating thermoelectricity plant's original heat supply back pressure machine stable operation, and energy storage back pressure machine serves the generating effect when regulating original heat supply back pressure machine to run, and makes maximization of economic benefit.
Claims (4)
1. back pressure machine heat supply, an energy-storage system, is characterized in that: comprise back pressure machine for thermal sub-system and energy storage subtense angle;
Described back pressure machine comprises boiler, heat supply back pressure machine, the little steam turbine of pneumatic pump, low pressure oxygen-eliminating device, feed water pump, auxiliary feed water pump, high-pressure heater, continuous blowdown flash tank, regular unloading container and temperature-decreased pressure reducer for thermal sub-system; The steam ouput of boiler is connected with the main inlet throttle-stop valve import of heat supply back pressure machine by main steam line; The exhaust vent of heat supply back pressure machine is divided into two-way, and a road is connected with the heat supply mouth of pipe, and another road, after the little steam turbine of pneumatic pump, is connected with low pressure oxygen-eliminating device; The low pressure feed water end of low pressure oxygen-eliminating device is connected with inlet of high pressure heater with auxiliary feed water pump by feed water pump; The hot water outlet of high-pressure heater is connected with the water intake of boiler, and the hot water through high-pressure heater sends into boiler economizer, and the sewage draining exit of boiler is connected with continuous blowdown flash tank; Continuous blowdown flash tank sewage draining exit is connected with regular unloading container, the sewer access regular unloading container in continuous blowdown flash tank;
Described energy storage subtense angle comprises energy storage back pressure machine, cold-water tank, hot water tank, steam water heater and feedwater automatic controller, hot water pump, water supply pump; The steam inlet of steam water heater is connected with the exhaust steam pipe of heat supply back pressure machine; The demineralized water chemically come between waterwheel and cold water one tunnel are connected with the cold water interface of steam water heater, the hot water outlet of steam water heater is connected with hot water tank water intake, described cold water is stored in hot water tank after steam water heater heating, and the demineralized water chemically come between waterwheel and another road of cold water are connected with the water inlet of cold-water tank; The water outlet of cold-water tank is connected through the cold water end of water supply pump with feedwater automatic controller, the cold water of cold-water tank enters feedwater automatic controller, the water outlet of hot water tank is connected through the hot water end of hot water pump with feedwater automatic controller, hot water is sent into feedwater automatic controller, the cold water of cold-water tank and the hot water of hot water tank, by feedwater automatic controller, regulate the entering water temp entering Back-heating System of Heat Power Plant automatically; Feedwater automatic controller is connected with the feed-water inlet end of Back-heating System of Heat Power Plant;
The steam inlet of energy storage back pressure machine is connected with the exhaust steam pipe of heat supply back pressure machine; The steam-expelling port of energy storage back pressure machine is connected with the vapor interface of the steam water heater of energy-storage system; Steam water heater hot water outlet end is connected with hot water tank; The demineralized water chemically come between waterwheel and cold water are divided into two-way, one tunnel is connected with the cold water interface of steam water heater, the steam discharge of cold water and energy storage back pressure machine steam-expelling port is stored in hot water tank after steam water heater Hybrid Heating, and the demineralized water chemically come between waterwheel and another road of cold water are connected with cold-water tank; The water outlet of cold-water tank is connected with the cold water end of feedwater automatic controller, and the cold water of cold-water tank enters feedwater automatic controller; The water outlet of hot water tank is connected with the hot water end of feedwater automatic controller, hot water is sent into feedwater automatic controller; The cold water of cold-water tank and the hot water of hot water tank, by feedwater automatic controller, regulate the entering water temp entering Back-heating System of Heat Power Plant automatically; Feedwater automatic controller is connected with the feed-water inlet end of Back-heating System of Heat Power Plant.
2. back pressure machine heat supply according to claim 1, energy-storage system, it is characterized in that: feedwater automatic controller controls feedwater outlet temperature, when the rated heating capacity of heat supply back pressure machine when extraneous heat load is greater than its feed temperature 95 DEG C, feed temperature controls at 95 DEG C by feedwater automatic controller; When heat supply back pressure machine is less than the rated heating capacity of its feed temperature 20 DEG C in extraneous heat load, feed temperature controls at 20 DEG C by feedwater automatic controller; Heat supply back pressure machine is when extraneous heat load is less than the rated heating capacity of its feed temperature 95 DEG C and is greater than the rated heating capacity of its feed temperature 20 DEG C, according to heat supply back pressure machine thermodynamic properties, in feedwater automatic controller, set the oepration at full load of heat supply back pressure machine and mate the feed temperature of extraneous heat load, and hot water and the cool water quantity of feedwater automatic controller is entered according to this set value calculation, reach this setting value, make the specified operation at full capacity of heat supply back pressure machine.
3. the back pressure machine heat supply described in claim 1 or 2, the heat supply energy storage method of energy-storage system, is characterized in that, comprise the steps:
1) initial steam that back pressure machine produces for the boiler of thermal sub-system delivers to the main inlet throttle-stop valve import of heat supply back pressure machine by main steam line; Steam one tunnel after heat supply back pressure machine enters heat supply pipeline, enters low pressure oxygen-eliminating device after the little steam turbine of pneumatic pump of separately leading up to; By the low pressure feed water end of low pressure oxygen-eliminating device after feed water pump and auxiliary feed water pump, deliver to high-pressure heater; Hot water through high-pressure heater sends into boiler economizer, and the sewer of boiler enters regular unloading container after continuous blowdown flash tank;
2) when heat load low ebb, back pressure machine enters energy storage back pressure machine, energy storage back pressure machine steam discharge for the steam discharge part of thermal sub-system, is stored in hot water tank after 20 DEG C of demineralized waters of being come in chemical water workshop by steam water heater are heated to 95 DEG C;
3) when heat load peak, energy storage back pressure machine is out of service, and feedwater automatic controller cuts out cold water end interface, and the water now entering thermodynamic system is 95 DEG C of demineralized waters in hot water tank, reduce the steam flow that heat supply back pressure machine is used for backheat, improve the external heating load of heat supply back pressure machine;
4) when heat load non-peak or low ebb, close energy storage back pressure machine, feedwater automatic controller connects hot water end and cold water end interface, the water controlling to enter thermodynamic system is between 20 DEG C-90 DEG C, the displacement of heat supply back pressure machine is made automatically to adapt to extraneous heat load, reach the oepration at full load of heat supply back pressure machine, improve calorific efficiency of heat power station and economic benefit.
4. the heat supply energy storage method of back pressure machine heat supply according to claim 3, energy-storage system, it is characterized in that: in described step 2) in, feedwater automatic controller hot water end interface is closed, the water entering thermodynamic system is 20 DEG C of demineralized waters in cold-water tank, increase the steam flow that heat supply back pressure machine is used for backheat, reduce the external heating load of heat supply back pressure machine.
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Cited By (3)
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| CN106089338A (en) * | 2016-06-03 | 2016-11-09 | 东南大学 | A kind of back pressure machine association system regulating heat supply and generating and method |
| CN106989433A (en) * | 2017-03-30 | 2017-07-28 | 德清县中能热电有限公司 | A kind of tide heat reservoir and tide heat supply method |
| CN109184831A (en) * | 2018-10-17 | 2019-01-11 | 中国船舶重工集团公司第七0三研究所 | It a kind of energy supply side can multipotency switching, the hot energy storage multipotency supply system of decoupling type |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106089338A (en) * | 2016-06-03 | 2016-11-09 | 东南大学 | A kind of back pressure machine association system regulating heat supply and generating and method |
| CN106089338B (en) * | 2016-06-03 | 2018-09-14 | 东南大学 | A kind of back pressure machine association system and method adjusting heat supply and power generation |
| CN106989433A (en) * | 2017-03-30 | 2017-07-28 | 德清县中能热电有限公司 | A kind of tide heat reservoir and tide heat supply method |
| CN109184831A (en) * | 2018-10-17 | 2019-01-11 | 中国船舶重工集团公司第七0三研究所 | It a kind of energy supply side can multipotency switching, the hot energy storage multipotency supply system of decoupling type |
| CN109184831B (en) * | 2018-10-17 | 2023-10-20 | 中国船舶重工集团公司第七0三研究所 | Energy supply side multi-energy switching and decoupling type heat energy storage multi-energy supply system |
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