CN112460668A - Undisturbed heat storage system and method for peak valley filling of back pressure type heat supply unit - Google Patents
Undisturbed heat storage system and method for peak valley filling of back pressure type heat supply unit Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/08—Storage tanks
Abstract
The application discloses an undisturbed heat storage system and a method for peak valley filling of a back pressure type heat supply unit, the undisturbed heat storage system for peak valley filling of the back pressure type heat supply unit comprises a steam direct heating device, a heat storage water tank and a booster water pump, wherein one end of the steam direct heating device is connected with a back pressure machine steam exhaust unit, and the other end of the steam direct heating device is arranged in the heat storage water tank; one end of the booster water pump is connected with the heat storage water tank, and the other end of the booster water pump is connected with the atmospheric deaerator; a series of partitions, regulating valves and flow meter monitoring are arranged among the devices. Heating the desalted water by using steam at night and storing the desalted water, and recycling the desalted water after being stored and heated to the system in the daytime; on one hand, the steam exhaust amount of the back pressure unit is increased at night, the night efficiency of the back pressure unit is improved, and the generated energy is increased; on the other hand, the heated hot water is used in the daytime, so that the self-use steam in the factory in the daytime is reduced, and the hot water is used for supplying heat; the two are combined to play a role in peak and valley filling.
Description
Technical Field
The invention belongs to the field of thermal power generation and heat supply, particularly relates to a heat supply and heat storage technology of a thermal power plant, and particularly relates to an undisturbed heat storage system and method for peak valley filling of a back pressure type heat supply unit.
Background
The centralized heating in the industrial field is one of effective means for reducing pollution by integrating small boilers in various local governments, and the back pressure unit is a heat and power cogeneration technology vigorously advocated and promoted in the power industry due to the high-efficiency heat and power cogeneration performance and the extremely low heat supply target coal consumption. However, in steam users facing heat supply enterprises, steam consumption time, production characteristics and steam consumption are different, so that loads of most back presses in the industry must be adjusted along with changes of heat loads, and firstly, efficiency of the back presses is greatly reduced along with reduction of the heat loads until the back presses cannot operate, and the advantages of the back presses cannot be brought into play. Secondly, the heat supply load at the peak possibly exceeds the heat supply capacity of the back pressure machine, and the temperature and pressure reducing device is required to supply heat, so that the heat economy of the whole plant is reduced.
At present, enterprises adopting backpressure machines for heat supply basically adopt a plurality of backpressure machines to be configured gradually from small to large according to the increase of heat load or ensure the efficient operation of the backpressure machines in a mode of networking steam supply with other enterprises, but the heat supply enterprises with single heat source points can not solve the troubles in the modes. A heat supply and energy storage system (patent application number: CN201520728069.6) proposes the energy storage application in a back pressure machine system, but the technical system is complex, is provided with a series of system arrangements such as an energy storage back pressure machine, a cold water tank, a hot water tank, a heater and the like, and has large investment amount, huge system, large heat loss and complex operation; when the heat load is higher, the energy storage back press machine cannot operate, so that equipment is idle, and the surface heater is adopted, so that the heating efficiency is poor. A back pressure turbine starting steam exhaust system (patent application number: 201710784483.2) provides recycling of starting steam exhaust in a back pressure turbine starting process, functions of the system are limited to application of a back pressure machine starting process, a control means is single, and the system is in an idle state in a back pressure machine operation process and cannot provide a solution for peak-valley change of heat load.
Disclosure of Invention
The invention aims to provide an undisturbed heat storage system and a method for peak valley filling of a back pressure type heat supply unit, so as to solve the problems in the prior art in the background technology.
An undisturbed heat storage system for peak valley filling of a back pressure type heat supply unit comprises a steam direct heating device, a heat storage water tank and a booster water pump, wherein one end of the steam direct heating device is connected with a back pressure machine steam exhaust unit, and the other end of the steam direct heating device is arranged in the heat storage water tank;
one end of the booster water pump is connected with the heat storage water tank, and the other end of the booster water pump is connected with the atmospheric deaerator; a series of partitions, regulating valves and flow meter monitoring are arranged among the devices.
Preferably, the inside of the heat storage water tank is communicated with a demineralized water adding pipe, and the demineralized water adding pipe is sequentially provided with a shaft seal heater, a demineralized water isolating valve, an adjusting valve and a demineralized water inlet flow meter.
Preferably, a back pressure machine steam exhaust isolating valve, a heat supply network steam supply valve, a heating steam isolating valve, a regulating valve and a heating steam flowmeter are sequentially assembled on a steam exhaust pipeline between the back pressure machine steam exhaust group and the steam direct heating device.
Preferably, a back pressure machine silencer is arranged on a steam exhaust pipeline between the back pressure machine steam exhaust group and the steam direct heating device.
Preferably, a hot water outlet flow meter is arranged on a drainage pipeline between the pressure boosting water pump and the atmospheric deaerator.
The invention provides an undisturbed heat storage method for peak valley filling of a back pressure type heat supply unit, which comprises the following steps:
s1, controlling the addition of demineralized water by a back pressure machine steam exhaust group and a demineralized water inlet closing valve and a demineralized water inlet adjusting valve in a mode of heating a steam closing valve and an adjusting valve according to the proportion of about 1:10 at night, atomizing steam by a direct steam heating device to increase the heating area, reduce noise and vibration, mixing the steam with the demineralized water, heating to 90 ℃, and storing in a heat storage water tank until the water is full;
s2, boosting the hot water stored in the heat storage water tank by the booster water pump in daytime, and then feeding the boosted hot water into an atmospheric deaerator for deaerating;
s3, before the back pressure machine exhaust group is started, heating, storing and using can be carried out by using heat supply network steam through a heat supply network steam supply valve, a heating steam isolating valve and adjusting valve, and a demineralized water inlet isolating valve and adjusting valve;
and S4, heating, storing and using the back pressure machine exhaust steam block valve, the heating steam block valve and the regulating valve, and the demineralized water inlet block valve and the regulating valve in the starting process of the back pressure machine exhaust steam group.
Preferably, in the step S1, the proportion is determined by the heat of the steam.
Preferably, in S1, the mixing ratio is monitored by the heating steam inflow meter and the demineralized water inflow meter, and the monitoring and adjustment are assisted by the temperature point in the water tank.
Preferably, in S2, the consistency with the system is monitored by the hot water outlet flow meter.
Preferably, in S4, the steam to be discharged during the starting process is discharged into the heat storage water tank to heat the demineralized water, and the working medium is recovered.
The invention has the beneficial effects that:
1. the process is simple, only a set of system is needed to be arranged in parallel on the exhaust steam of the back pressure turbine, no running conflict occurs with the original thermodynamic system of the unit, and the system can be cut off independently without influencing the running of the original system even if the system has defects and is forced to run;
2. the heating mode is direct mixed heating, the best heating effect is ensured, meanwhile, steam is atomized by a multi-nozzle direct heating device arranged in the water tank (72 phi 50mm nozzles are uniformly distributed on the heating device, and 10 phi 8mm small holes are distributed on each nozzle);
3. by arranging the isolating valves, the regulating valves and the flow meters between the heat supply network system and the heating steam system and between the normal water replenishing and the heat storage water replenishing of the unit, the change of flow can be flexibly regulated, and the switching on and off of the system can be flexibly controlled.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a system flow diagram of the present invention;
FIG. 2 is a schematic view of a heating load curve before the embodiment 2 of the present invention is implemented;
fig. 3 is a schematic view of a heating load curve after the embodiment 2 of the present invention is implemented.
Description of the drawings: 1. a back press steam exhaust group; 2. a steam direct heating device; 3. a heat storage water tank; 4. a booster water pump; 5. an atmospheric deaerator; 6. a shaft seal heater; 7. a back press steam exhaust closing valve; 8. a heat supply network steam supply valve; 9. a heating steam block valve and a regulating valve; 10. heating the steam flow meter; 11. a demineralized water block valve and an adjusting valve; 12. a demineralized water inflow flow meter; 13. a hot water outlet flow meter; 14. a muffler of a back press; 15. and a demineralized water adding pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, an undisturbed heat storage system for peak valley filling of a back pressure type heat supply unit comprises a steam direct heating device 2, a heat storage water tank 3 and a booster water pump 4, wherein one end of the steam direct heating device 2 is connected with a back pressure machine steam exhaust unit 1, and the other end is arranged in the heat storage water tank 3;
the steam direct heating device 2 adopts a direct mixed heating mode, ensures the optimal heating effect, atomizes steam by the multi-nozzle direct heating device arranged in the water tank (the heating device is uniformly provided with 72 phi 50mm nozzles, and each nozzle is provided with 10 phi 8mm small holes;
one end of the booster water pump 4 is connected with the heat storage water tank 3, and the other end is connected with the atmospheric deaerator 5; a series of partitions, regulating valves and flow meter monitoring are arranged among the devices.
The inside of the heat storage water tank 3 is communicated with a demineralized water adding pipe 15, and a shaft seal heater 6, a demineralized water isolating valve and regulating valve 11 and a demineralized water inlet flow meter 12 are sequentially assembled on the demineralized water adding pipe 15.
A back pressure machine steam exhaust closing valve 7, a heat supply network steam supply valve 8, a heating steam closing valve and regulating valve 9 and a heating steam flowmeter 10 are sequentially assembled on a steam exhaust pipeline between the back pressure machine steam exhaust group 1 and the steam direct heating device 2.
A back pressure machine silencer 14 is arranged on the exhaust pipeline between the back pressure machine exhaust group 1 and the steam direct heating device 2.
A hot water outlet flow meter 13 is arranged on a drainage pipeline between the booster water pump 4 and the atmospheric deaerator 5.
A method for undisturbed heat storage for peak valley filling of a back pressure type heat supply unit comprises the following steps:
s1, controlling the back pressure machine steam exhaust group to be supplemented with demineralized water by a demineralized water inlet isolating valve and a regulating valve in a mode that the proportion is about 1:10 (the proportion depends on the steam heat) through a heating steam isolating valve and the regulating valve at night, atomizing the steam by a steam direct heating device to increase the heating area, reduce noise and vibration, mixing and heating the steam and the demineralized water to 90 ℃, storing the steam and the demineralized water in a heat storage water tank until the steam is full of water, monitoring the matching proportion condition by a heating steam inlet flow meter and a demineralized water inlet flow meter, and assisting in monitoring and regulating through a temperature point in the water tank;
s2, boosting the hot water stored in the hot water storage tank by a boosting water pump in daytime, then feeding the hot water into an atmospheric deaerator for deaerating, and monitoring the consistency with the system by a hot water outlet flow meter;
s3, before the back pressure machine exhaust group is started, heating, storing and using can be carried out by using heat supply network steam through a heat supply network steam supply valve, a heating steam isolating valve and adjusting valve, and a demineralized water inlet isolating valve and adjusting valve;
s4, in the starting process of the back pressure machine steam exhaust group, the back pressure machine steam exhaust isolating valve, the heating steam isolating valve and the regulating valve, and the demineralized water inlet isolating valve and the regulating valve are used for heating, storing and using, the steam which needs to be exhausted in the starting process is exhausted into the heat storage water tank to heat the demineralized water, and the working medium is recovered.
Example 2
Referring to fig. 1, an undisturbed heat storage system for peak valley filling of a back pressure type heat supply unit comprises a steam direct heating device 2, a heat storage water tank 3, a booster water pump 4 and related pipelines, valves and control parts (wherein a newly added system is arranged in a circle). One end of the steam direct heating device 2 is connected with the back pressure machine steam exhaust group 1, and the other end is arranged in the heat storage water tank 2; the heat storage water tank 2 is used for storing heated hot water; one end of the booster water pump 4 is connected with the heat storage water tank 2, and the other end is connected with the atmospheric deaerator 5; a series of partitions, regulating valves and flow meter monitoring are arranged among the devices.
The system mainly comprises two processes: firstly, a heating process: entering a steam direct heating device 2 through a back pressure machine steam exhaust group 1 at night, mixing with demineralized water, heating and storing; secondly, the use process is as follows: in the daytime, the heated and stored hot water enters an atmospheric deaerator 5 through a booster water pump 4 and is used for supplementing hot water for the unit;
back press steam exhaust group 1: and after the main steam is fed into the cogeneration unit, the dead steam is completely used for supplying heat and generating electricity and supplying heat.
Steam direct heating device 2: the steam discharged from the back pressure machine is atomized and mixed with the incoming desalted water for heating.
Heat storage water tank 3: and storing the heated desalted water.
The boosting water pump 4: and (4) boosting the stored hot desalted water and then feeding the hot desalted water into an atmospheric deaerator.
Atmospheric deaerator 5: and deoxidizing the supplemented desalted water and then supplementing the deoxidized desalted water to a thermodynamic system of the unit.
Shaft seal heater 6: used for cooling the shaft seal leakage steam of the steam turbine.
The exhaust closing valve 7 of the back pressure machine: the method is used for isolation after the back press is shut down.
Heat supply network steam supply valve 8: the device is used for communicating the exhaust steam of the back pressure machine with a heat supply network.
Heating steam block valve and regulating valve 9: for controlling the input, removal and adjustment of the heating device.
Heating the steam flow meter 10: the device is used for monitoring the steam inlet quantity of the heating device and guiding the adjustment.
Demineralized water block valve and regulating valve 11: used for controlling the input, cutting and regulation of the desalted water entering the water tank.
Demineralized water inflow meter 12: the device is used for monitoring the amount of desalted water entering the heat storage water tank and guiding adjustment.
Hot water outlet flow meter 13: the device is an important means for monitoring the water outlet flow of the hot water, guiding the control of the pressure boosting water pump and ensuring one-day circulation.
Back-pressure machine muffler 14: for silencing to reduce ambient noise during start-up of the back pressure machine.
The process is specifically illustrated as follows:
the first process is as follows: at night, the exhausted steam of a 1 back pressure turbine is fed into a system by a 9 heating steam block valve and a regulating valve according to the ratio of 1:10 (the ratio depends on the steam heat), and the system controls the supplement of demineralized water by an 11 demineralized water inlet block valve and the regulating valve, atomizes the steam by a 2 steam direct heating device to increase the heating area, reduce noise and vibration, mixes with the demineralized water and heats to 90 ℃, and stores in a 3 heat storage water tank until the water is full. During the process, the matching proportion condition is monitored by a heating steam inlet flow meter 10 and a demineralized water inlet flow meter 12, and the temperature point in the water tank is used for assisting monitoring and adjustment.
And a second process: the hot water stored in the 3 heat storage water tanks is pressurized by the 4 pressure boosting water pump and then enters the 5 atmosphere deaerators to be deaerated for use, and the consistency with the system is monitored by the 13 heat storage water outlet flow meters.
The two processes form a heating, storing and using circulating system respectively in the day and at night.
And a third process: before the backpressure machine starts, available heat supply network steam passes through 8 heat supply network steam supply valves, 9 heating steam block valves and governing valves, 11 demineralized water intaking block valves and governing valves and heats, stores, uses, improves thermodynamic system's moisturizing temperature for the boiler starts.
And (4) a fourth process: during the starting process of the back pressure machine, the back pressure machine can replace the starting steam exhaust of the traditional back pressure machine, the steam exhaust closing valve of the 7 back pressure machine, the heating steam closing valve and the regulating valve of the 9 back pressure machine, and the demineralized water inlet closing valve and the regulating valve of the 11 back pressure machine are used for heating, storing and using, the steam which needs to be exhausted during the starting process is exhausted into the heat storage water tank to heat the demineralized water, the working medium is recycled, and the environmental noise is also reduced;
the system analyzes the resolving power:
according to the exhaust steam temperature and the heat supply load characteristics of the back pressure machine, the system capacity is set to be about 30% of the heat supply load all day long, steam used for heating at night is theoretically consistent with self-used steam in the factory reduced in the daytime, but the self-used steam in the factory reduced in the daytime is 85-90% of the self-used steam in the factory reduced in the daytime due to certain heat dissipation loss and the lowest safe water level. The output of hot water can be adjusted according to the fluctuation condition of the heat load in the actual application process;
the system controls and analyzes:
when the hot user uses steam at night, the steam of the back press is introduced into the heat storage water tank to be exhausted, the demineralized water is synchronously supplemented, and the demineralized water is heated to 90 ℃ gradually to be stored, so that the steam exhaust amount of the back press is increased; and because the heating steam pipeline and the water inlet pipeline are both provided with the regulating valve and the flowmeter, the steam inlet amount and the water inlet amount can be flexibly regulated by controlling the regulating valve according to the heat load valley value, the steam discharge amount of the back pressure machine is ensured to be increased to a range with higher efficiency, and the steam discharge temperature of the back pressure machine is minimized because the steam discharge amount is reduced and the steam discharge temperature is increased.
The heated hot water is supplemented into the atmospheric deaerator through the booster pump in the daytime, on the basis of ensuring the minimum cooling water quantity of the shaft seal heater of the back pressing machine, the hot water can be used to the maximum, the self-use steam in a factory caused by the supplement of cold water is reduced, about 75% -80% of the steam for the atmospheric deaerator can be replaced to the maximum, and all the steam for the part is used for supplying steam to the outside.
In the running process of the system, the water yield can be controlled by monitoring the heat supply flow and the residual hot water quantity through a booster pump frequency converter, and the hot water quantity is guaranteed to be used to the lowest water level before the heating process is started; the water outlet quantity of hot water can be adjusted according to the demand of a heat supply peak to assist the peak of heat load, so that the steam supply amount of the temperature and pressure reducer is reduced, and the economy of the whole plant is improved.
The purpose of recycling the system is achieved by heating and storing at night and using one cycle every day in the daytime.
The system can also be used in the starting process of the unit, and plays a role in recovering the exhausted steam of the unit.
The system can be started and stopped synchronously with the back pressure machine and is suitable for any working condition point; because it links to each other with heating system to be provided with the isolating valve, can also heat demineralized water and supply hot water to the system before the unit starts and do not influence the unit and start for the start-up speed of boiler and reduce the coal consumption in the start-up process.
The advantages are that:
(1) the process is simple, only one set of system is needed to be arranged in parallel on the exhaust steam of the back pressure turbine, the system does not conflict with the original thermodynamic system of the unit in operation, and the system can be cut off independently even if the system has defects and is forced to operate without affecting the operation of the original system.
(2) The heating mode is direct mixed heating, the best heating effect is ensured, meanwhile, steam is atomized by the multi-nozzle direct heating device arranged in the water tank (72 phi 50mm nozzles are uniformly distributed on the heating device, and 10 phi 8mm small holes are distributed on each nozzle). through the configuration, the noise caused by steam expansion is reduced after the steam is dispersed, meanwhile, the heating area and the heating speed of the steam are increased by a steam shunting mode, the vibration and the noise caused by the steam expansion and the heating process are reduced to the greatest extent, and the equipment and the environment are protected.
(3) By arranging the isolating valves, the regulating valves and the flow meters between the heat supply network system and the heating steam system and between the normal water replenishing and the heat storage water replenishing of the unit, the change of flow can be flexibly regulated, and the switching on and off of the system can be flexibly controlled.
The effect is as follows:
the system has the advantages that the heating, storage and output are in a circulation mode in the daytime and at night, the steam discharge capacity of the backpressure unit at night is effectively improved, and the generated energy is increased according to the characteristic of 'fixing the electricity with heat' of the backpressure unit; and the heated hot water is used in the daytime, so that the amount of self-steam used in the plant is reduced, the hot water can be used for supplying heat to the outside, and the heat supply capacity of the whole plant is improved, namely, the benefits in two aspects of night power generation and daytime steam supply are realized.
In addition, for the heat supply unit, the interruption of the demineralized water causes the interruption of external heat supply, the arrangement of the system increases the reserve capacity of the demineralized water, gains time for the interruption processing caused by the defects of the demineralized water system, and improves the heat supply interruption capacity caused by the resistance to the interruption of the demineralized water.
Please refer to fig. 2-3;
the heating load curve before the scheme is implemented is as shown in figure 2:
in fig. 2, the heat supply capacity of the unit is 407t/h, and when no heat storage device is arranged, the heat supply capacity of the unit is exceeded in about 10 hours all day during a busy season, so that about 475t steam supply gaps exist all day, partial heat load needs to be forcibly cut off or the needs of heat users are met by other methods, and the economy of the unit is lost.
The implemented heating load curve is as shown in figure 3;
by implementing the scheme, the fluctuation of heat supply load is slowed down, the heat supply amount is improved by 20t/h integrally and averagely at night, and the heat supply valley value is improved; the steam utilization in the plant can be converted into heat supply capacity in the daytime, the external steam supply capacity of about 20t/h in the daytime is indirectly improved, and the gap is reduced to 305t in the period of a busy season; the double benefits of power generation and heat supply are brought on the premise of improving the operation safety coefficient of the unit. The steam discharge amount of 200 t/day is increased at night, the electric energy production amount of about 4.6 ten thousand kW.h/day and the heat supply amount of 170 t/day are directly increased, the income can be increased by 272 ten thousand yuan throughout the year, and the whole investment can be recovered in less than 2 years.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An undisturbed heat storage system for peak valley filling of a back pressure type heat supply unit comprises a steam direct heating device (2), a heat storage water tank (3) and a booster water pump (4), and is characterized in that one end of the steam direct heating device (2) is connected with a back pressure machine steam exhaust unit (1), and the other end of the steam direct heating device is arranged in the heat storage water tank (3);
one end of the booster water pump (4) is connected with the heat storage water tank (3), and the other end of the booster water pump is connected with the atmospheric deaerator (5); a series of partitions, regulating valves and flow meter monitoring are arranged among the devices.
2. The undisturbed heat storage system for back pressure heating set peak valley filling of claim 1 wherein: the inside of the heat storage water tank (3) is communicated with a demineralized water adding pipe (15), and a shaft seal heater (6), a demineralized water isolating valve and regulating valve (11) and a demineralized water inlet flow meter (12) are sequentially assembled on the demineralized water adding pipe (15).
3. The undisturbed heat storage system for back pressure heating set peak valley filling of claim 1 wherein: and a steam exhaust pipeline between the back press steam exhaust group (1) and the steam direct heating device (2) is sequentially provided with a back press steam exhaust closing valve (7), a heat supply network steam supply valve (8), a heating steam closing valve and regulating valve (9) and a heating steam flowmeter (10).
4. An undisturbed heat storage system for back pressure heating supply peak valley filling as claimed in claim 3 wherein: and a backpressure machine silencer (14) is arranged on a steam exhaust pipeline between the backpressure machine steam exhaust group (1) and the steam direct heating device (2).
5. The undisturbed heat storage system for back pressure heating set peak valley filling of claim 1 wherein: and a hot water outlet flow meter (13) is assembled on a drainage pipeline between the booster water pump (4) and the atmospheric deaerator (5).
6. Method for undisturbed heat storage for peak valley filling of back pressure heating units according to claims 1 to 5, characterized in that: the method comprises the following steps:
s1, controlling the addition of demineralized water by a back pressure machine steam exhaust group and a demineralized water inlet closing valve and a demineralized water inlet adjusting valve in a mode of heating a steam closing valve and an adjusting valve according to the proportion of about 1:10 at night, atomizing steam by a direct steam heating device to increase the heating area, reduce noise and vibration, mixing the steam with the demineralized water, heating to 90 ℃, and storing in a heat storage water tank until the water is full;
s2, boosting the hot water stored in the heat storage water tank by the booster water pump in daytime, and then feeding the boosted hot water into an atmospheric deaerator for deaerating;
s3, before the back pressure machine exhaust group is started, heating, storing and using can be carried out by using heat supply network steam through a heat supply network steam supply valve, a heating steam isolating valve and adjusting valve, and a demineralized water inlet isolating valve and adjusting valve;
and S4, heating, storing and using the back pressure machine exhaust steam block valve, the heating steam block valve and the regulating valve, and the demineralized water inlet block valve and the regulating valve in the starting process of the back pressure machine exhaust steam group.
7. The method of undisturbed heat storage for peak valley filling of a back pressure heating unit of claim 6 wherein: in the step S1, the proportion is determined by the heat of the steam.
8. The method of an undisturbed thermal storage system for back pressure heating unit peaking valley filling according to claim 6 wherein: in the step S1, the matching proportion condition is monitored through the heating steam inflow flowmeter and the demineralized water inflow flowmeter, and the temperature point in the water tank is used for assisting in monitoring and adjusting.
9. The method of an undisturbed thermal storage system for back pressure heating unit peaking valley filling according to claim 6 wherein: in S2, the consistency with the system is monitored by the hot water outlet flow meter.
10. The method of an undisturbed thermal storage system for back pressure heating unit peaking valley filling according to claim 6 wherein: and in the S4, steam required to be discharged in the starting process is discharged into the heat storage water tank to heat demineralized water, and the working medium is recycled.
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