CN221036982U - Thermal power plant steam non-condensation energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology - Google Patents
Thermal power plant steam non-condensation energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology Download PDFInfo
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Abstract
The utility model discloses a thermal power plant steam non-condensation energy storage peak regulation system coupling phase change heat storage and steam heat storage tank technology, which comprises a heat storage steam inlet pipe, a phase change heat storage heat exchanger, a heat storage return steam pipe, a general steam pipe, a heat storage and release water tank group and a heat release steam supply pipe; the phase-change heat storage heat exchanger is connected to the middle part of the heat storage steam inlet pipe through a loop pipeline; the hot end inlet of the heat storage heat exchanger is connected with the tail part of the heat storage steam inlet pipe, the hot end outlet of the heat storage heat exchanger is connected with the heat storage return steam pipe head, the cold end inlet of the heat storage heat exchanger is connected with a water supplementing pipe, and the cold end outlet of the heat storage heat exchanger is connected to the heat storage and release water tank set through a general steam-water pipe; the heat storage and release water tank group is connected to a heat release steam supply pipe through a steam pipeline at the top, and the heat storage and release water tank group is connected to a water supplementing pipeline at the cold end inlet of the heat storage heat exchanger through a water pipe at the bottom.
Description
Technical Field
The utility model relates to the technical field of power plant steam energy storage peak shaving, in particular to a thermal power plant steam non-condensation energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology.
Background
With implementation of the target processes of carbon peak reaching and carbon neutralization, the operation development of various clean energy sources is expanding further, the demand of the traditional power plant peak shaving power source is gradually increased, compared with the power sources such as clean energy sources, the peak shaving performance of the coal power plant is better, therefore, the peak shaving demand of the coal power plant is increasing year by year, the country also has corresponding energy policy support, however, the peak shaving measures of the coal power plant are fewer, especially, the development of the steam extraction energy storage peak shaving is slower, the peak shaving measures are deficient, and therefore, the steam extraction energy storage peak shaving of the power plant is the market demand and is also the national energy strategy demand.
The peak regulation measures of the existing power plants in China are relatively few, and mainly comprise the following modes:
(1) The power plant load regulation system is used for deep diving, but the regulation capability of the power plant cannot meet the regulation requirement of the power grid peak-valley period on the load obviously, and the risk of safe operation of the power plant equipment system is obviously increased along with the increase of the power plant load regulation amplitude.
(2) Mode of increasing power consumption: the method mainly converts redundant electric power into low-grade heat energy in the period of peak regulation, such as an electric heat storage boiler, an electrode boiler and the like, and the comprehensive efficiency of the power consumption peak regulation modes is low.
(3) The method has the advantages that the method is lack in measures for extracting steam energy storage and peak shaving of a power plant, and almost no more suitable practical application cases exist in the aspects of steam full condensation heat storage and steam sensible heat storage.
Disclosure of utility model
Aiming at the defects of the existing power plant steam extraction peak regulation energy storage measures, the utility model provides a steam sensible heat storage and release system suitable for power plant steam extraction peak regulation, and realizes power plant high-capacity energy storage peak regulation.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
A thermal power plant steam non-condensation energy storage peak regulation system coupling phase change heat storage and steam heat storage tank technology comprises a heat storage steam inlet pipe, a phase change heat storage heat exchanger, a heat storage return steam pipe, a general steam pipe, a heat storage and release water tank group and a heat release steam supply pipe;
the phase-change heat storage heat exchanger is connected to the middle part of the heat storage steam inlet pipe through a loop pipeline; the hot end inlet of the heat storage heat exchanger is connected with the tail part of the heat storage steam inlet pipe, the hot end outlet of the heat storage heat exchanger is connected with the heat storage return steam pipe head, the cold end inlet of the heat storage heat exchanger is connected with a water supplementing pipe, and the cold end outlet of the heat storage heat exchanger is connected to the heat storage and release water tank set through a general steam-water pipe; the heat storage and release water tank group is connected to a heat release steam supply pipe through a steam pipeline at the top, and the heat storage and release water tank group is connected to a water supplementing pipeline at the cold end inlet of the heat storage heat exchanger through a water pipe at the bottom.
Specifically, the heat storage steam inlet pipe is positioned between two connecting ends of a loop pipeline where the phase change heat storage heat exchanger is positioned and is connected to the heat release steam outlet pipe through a first branch pipe; the heat storage steam inlet pipe is positioned at the front end of the inlet of the heat storage heat exchanger and is connected to the heat release steam supply pipe through the second branch pipe; the first branch pipe and the second branch pipe are respectively provided with a first heat storage time blocking valve, and the joint of the heat storage steam inlet pipe and the rear end of the loop pipeline is provided with a second heat storage time blocking valve.
Further, the heat storage and release water tank group comprises a group of steam heat storage tanks and at least one continuous buffer tank, and each steam heat storage tank and each continuous buffer tank are connected on a general steam water pipe in a parallel connection mode; the top steam pipelines of each steam heat storage tank and the continuous buffer tank are sequentially connected in parallel on the universal steam water pipe, and the bottom water pipes of each steam heat storage tank and the continuous buffer tank are mutually connected in parallel; the top steam pipelines of each steam heat storage tank and each continuous buffer tank are respectively provided with a water tank group general isolating valve, and the bottom water pipes of each steam heat storage tank and each continuous buffer tank are respectively provided with a water tank group communicating valve.
Specifically, after the bottom water pipes of each steam heat storage tank and the continuous buffer tank are connected in parallel to a main water pipe, the main water pipe and a water supplementing pipe led out by a power plant are connected in parallel to a water supplementing pipe at the cold end inlet of the heat storage heat exchanger; the water main is provided with a hot water function isolating valve; a low-temperature system water supplementing block valve, a water supplementing pressurizing pump during heat storage and a circulating water feeding temperature regulating valve are sequentially arranged on a water supplementing pipe led out from the power plant; and a heat storage circulating pump is arranged on a water supplementing pipeline at the cold end inlet of the heat storage heat exchanger.
Further, the steam heat storage tanks and the continuous buffer tanks are respectively provided with a liquid level meter for monitoring the water level in the tanks.
Specifically, the inlet end of the general steam-water pipe is connected to the cold end outlet of the heat storage heat exchanger through a high-temperature water outlet pipe, and the front end of the general steam-water pipe is connected to a heat release steam supply pipe; a high-temperature water outlet pipe between a cold end outlet of the heat storage heat exchanger and the general steam-water pipe is sequentially provided with a heat storage time outlet water temperature control regulating valve and a heat release time isolating valve; and a third heat accumulation time isolating valve and a heat release time reducing valve are sequentially arranged at the connecting port of the heat release steam supply pipe and the general steam pipe.
Further, a heat storage steam inlet valve and a heat storage steam regulating valve are sequentially arranged at the front end of the heat storage steam inlet pipe; the joint of the heat storage steam inlet pipe and the heat storage heat exchanger is provided with a steam isolating valve.
Further, the rear end of the heat accumulation return steam pipe is provided with a heat accumulation return steam isolating valve.
Further, the rear end of the heat release steam supply pipe is provided with a heat release steam supply valve, and a saturated steam regulating valve is arranged between the connecting ends of the first branch pipe and the second branch pipe of the heat release steam supply pipe.
Further, the front and rear inlets and outlets of the phase-change heat storage heat exchanger are provided with inlet and outlet isolating valves of the phase-change heat storage heat exchanger.
The beneficial effects are that:
(1) The energy storage peak shaving system aims at regulating the lack of peak shaving measures of domestic power plants, is particularly suitable for extracting the sensible heat of steam of the power plants to carry out peak shaving and energy storage, can also be used for industrial and mining enterprises and institutions with similar purpose requirements, and has the main functions of storing the sensible heat of the steam and releasing the superheated steam, and the comprehensive efficiency of energy conversion in the conversion of storing and releasing the superheated steam can reach more than 90 percent.
(2) The system has high energy conversion efficiency of steam energy storage and heat supply, and improves the energy storage efficiency by more than 1 time compared with the traditional electric power (reduces the process of converting steam heat energy into electric energy). The method can fully utilize the safety and economy advantages of the heat storage water tank group, and realize the storage and transfer of the steam peak regulation load of the high-efficiency high-capacity power plant. The influence of safe operation, poor peak shaving measures and the like of the peak shaving measures of the existing power plant can be effectively relieved. The heat storage water tank has reliable and safe energy storage performance, large heat storage capacity and good economy.
Drawings
The foregoing and/or other advantages of the utility model will become more apparent from the following detailed description of the utility model when taken in conjunction with the accompanying drawings and detailed description.
Fig. 1 is a schematic diagram of the overall structure of the energy storage peak shaving system.
Wherein each reference numeral represents:
1-heat storage steam inlet valve; 2-a heat storage steam regulating valve; 3-returning to the steam isolating valve during heat accumulation; 4-supplying a steam valve when releasing heat; 5-steam block valve; 6-controlling the temperature of the water outlet during heat accumulation; 7-a shut-off valve during heat release; 8-a pressure reducing valve for releasing heat; 9-a third heat accumulation time isolating valve; 10-a general isolating valve of a water tank group; 11-a water tank group communication valve; 12-a hot water function block valve; 13-a low-temperature system water supplementing isolating valve; 14-a circulating water supply temperature regulating valve; 15-a liquid level gauge; 16-saturated steam regulating valve; 17-a first heat accumulation time block valve; 18-a second heat accumulation time isolating valve; 19-phase change heat storage heat exchanger inlet and outlet block valves.
S1-heat storage steam inlet pipe; s2-heat accumulation returns to the steam pipe; s3, discharging heat from a steam pipe; s4-a first branch pipe; s5-a second branch pipe; s6, a heat storage heat exchanger; s7, a high-temperature water outlet pipe; s8, a general steam-water pipe; s9, a heat storage and release water tank group; s9-1, connecting a buffer tank; s10, a heat storage circulating pump; s11, water supplementing and pressurizing pumps during heat storage; s12-a phase-change heat storage heat exchanger.
Detailed Description
The utility model will be better understood from the following examples.
The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the disclosure of the present utility model, and are not intended to limit the scope of the utility model, which is defined by the claims, but rather by the terms of modification, variation of proportions, or adjustment of sizes, without affecting the efficacy or achievement of the present utility model, should be understood as falling within the scope of the present utility model. Also, the terms such as "upper", "lower", "front", "rear", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the utility model for which the utility model may be practiced or for which the relative relationships may be altered or modified without materially altering the technical context.
As shown in fig. 1, the thermal power plant steam non-condensation energy storage peak shaving system coupling the phase change heat storage and steam heat storage tank technology comprises a heat storage steam inlet pipe S1, a phase change heat storage heat exchanger S12, a heat storage heat exchanger S6, a heat storage return steam pipe S2, a general steam water pipe S8, a heat storage and release water tank set S9 and a heat release steam supply pipe S3.
The phase-change heat storage heat exchanger S12 is connected to the middle part of the heat storage steam inlet pipe S1 through a loop pipeline; the hot end inlet of the heat storage heat exchanger S6 is connected with the tail part of the heat storage steam inlet pipe S1, the hot end outlet of the heat storage heat exchanger S6 is connected with the head part of the heat storage return steam pipe S2, the cold end inlet of the heat storage heat exchanger S6 is connected with a water supplementing pipeline, and the cold end outlet of the heat storage heat exchanger S6 is connected to the heat storage and release water tank group S9 through a general steam pipe S8; the heat storage and release water tank set S9 is connected to the heat release steam supply pipe S3 through a steam pipeline at the top, and the heat storage and release water tank set S9 is connected to a water supplementing pipeline at the cold end inlet of the heat storage heat exchanger S6 through a water pipe at the bottom. The peak regulation steam (or other high-quality waste heat steam) of the power plant is used as a stored heat source, the heat of the sensible heat section of the superheated steam is stored in an energy storage system, and the heat energy is supplied in the form of superheated steam or saturated steam when the heat is supplied to the outside.
The heat storage steam inlet pipe S1 is positioned between two connecting ends of a loop pipeline where the phase change heat storage heat exchanger S12 is positioned and is connected to the heat release steam outlet pipe S3 through a first branch pipe S4; the heat storage steam inlet pipe S1 is positioned at the front end of the inlet of the heat storage heat exchanger S6 and is connected to the heat release steam supply pipe S3 through a second branch pipe S5; the first branch pipe S4 and the second branch pipe S5 are respectively provided with a first heat storage time blocking valve 17, and the joint of the heat storage steam inlet pipe S1 at the rear end of the loop pipeline is provided with a second heat storage time blocking valve 18. The heat storage heat exchanger S6 is connected in series behind the phase change heat storage heat exchanger S12, the low temperature Duan Xianre of steam is subjected to heat exchange through the heat exchanger and stored in the heat storage and release water tank set S9, and the sensible heat of the high temperature section is stored in the phase change heat storage heat exchanger S12.
The heat storage and release water tank set S9 comprises a group of steam heat storage tanks and at least one continuous buffer tank S9-1, and each steam heat storage tank and each continuous buffer tank S9-1 are connected on the universal steam water pipe S8 in a parallel connection mode; the top steam pipelines of each steam heat storage tank and the connecting buffer tank S9-1 are sequentially connected in parallel on the general steam water pipe S8, and the bottom water pipes of each steam heat storage tank and the connecting buffer tank S9-1 are mutually connected in parallel; the top steam pipelines of each steam heat storage tank and each continuous buffer tank S9-1 are respectively provided with a water tank group general-purpose isolating valve 10, and the bottom water pipes of each steam heat storage tank and each continuous buffer tank S9-1 are respectively provided with a water tank group communicating valve 11. The adopted structural mode of the heat storage and release water tank group S9 is serial modular manufacture, so that the scale of heat storage capacity is convenient, individual units of the steam heat storage tanks are continuously put into operation by adopting a parallel combination mode, and at least one unit (continuous buffer tank S9-1) is positioned near the extremely low level in the heat storage process and is used for continuously switching and circulating the circulating water quantity of other water tank units so as to solve the problem of larger load fluctuation in the heat storage process. The steam heat storage tank is operated in a parallel connection and connection mode, one water tank is selected as a connection buffer tank S9-1 at will, and the connection buffer tank S9-1 has the function of adjusting the system water capacity with overlarge turnover water quantity during heat storage and heat release, and can realize the effect of stable operation and heat exchange output of the heat storage heat exchanger.
After the bottom water pipes of each steam heat storage tank and the continuous buffer tank S9-1 are connected in parallel to a main water pipe, the main water pipe and a water supplementing pipe led out by a power plant are connected in parallel to a water supplementing pipe at the cold end inlet of the heat storage heat exchanger S6; the water main is provided with a hot water function isolating valve 12; a low-temperature system water supplementing block valve 13, a heat accumulating water supplementing pressurizing pump S11 and a circulating water feeding temperature regulating valve 14 are sequentially arranged on a water supplementing pipe led out from the power plant; and a heat storage circulating pump S10 is arranged on a water supplementing pipeline at the cold end inlet of the heat storage heat exchanger S6.
Each steam heat storage tank and the continuous buffer tank S9-1 are respectively provided with a liquid level meter 15 for monitoring the water level in the tank. The liquid level meter 15 is matched with the operation pressure of the water tank group to realize the dynamic monitoring of the effective residual heat of the water tank group.
The inlet end of the general steam-water pipe S8 is connected to the cold end outlet of the heat storage heat exchanger S6 through a high-temperature water outlet pipe S7, and the front end of the general steam-water pipe S8 is connected to the heat release steam supply pipe S3; a high-temperature water outlet pipe S7 between a cold end outlet of the heat storage heat exchanger S6 and a general steam pipe S8 is sequentially provided with a water outlet temperature control regulating valve 6 during heat storage and a blocking valve 7 during heat release; the connection port of the heat release steam supply pipe S3 and the general steam pipe S8 is provided with a third heat storage time isolating valve 9 and a heat release time reducing valve 8 in sequence. The heat storage and release water tank set S9 is used in combination with the heat release time reducing valve 8, so that saturated flash steam generated during the heat release operation of the heat storage and release water tank set S9 can be stably output and operated.
The front end of the heat storage steam inlet pipe S1 is sequentially provided with a heat storage steam inlet valve 1 and a heat storage steam regulating valve 2; the joint of the heat storage steam inlet pipe S1 and the heat storage heat exchanger S6 is provided with a steam isolating valve 5.
The rear end of the heat accumulation return steam pipe S2 is provided with a heat accumulation return steam isolating valve 3.
The rear end of the heat release steam supply pipe S3 is provided with a heat release steam supply valve 4, and a saturated steam regulating valve 16 is arranged between the connecting ends of the heat release steam supply pipe S3 and the first branch pipe S4 and the second branch pipe S5.
The front and rear inlets and outlets of the phase-change heat storage heat exchanger S12 are provided with phase-change heat storage heat exchanger inlet and outlet isolating valves 19.
The phase-change heat storage heat exchanger S12 is utilized to overheat and heat saturated flash steam generated by the heat storage and release water tank group S9, and the operation control mode is that the distribution proportion of high-temperature overheat steam and saturated steam is controlled through the regulating valve, so that the overheat steam temperature required by design is realized.
The implementation operation flow of the system is divided into two stages, one is a heat storage stage, the high-quality steam sensible heat which is shunted when the peak regulation of the power plant is finished and received and stored, and the other is a heat release stage, and the heat stored in the phase-change heat storage heat exchanger S12 and the heat storage and release water tank group S9 is returned to the power plant along a given path in the form of steam or directly supplied to the outside. And finishing a heat storage and release period after the heat stored in the system is released. The working principle flow of the two operation phases is expressed as follows (in connection with fig. 1):
the working principle flow of the heat storage stage is as follows:
All valves in the system device are in a closed state in the initial state, and after receiving an energy storage and heat storage starting instruction, the system sequentially opens a heat storage steam inlet valve 1, a heat storage steam regulating valve 2, a heat storage return steam isolating valve 3, a steam isolating valve 5, a heat storage water outlet temperature control regulating valve 6, a heat release isolating valve 7, a water tank group general isolating valve 10, a water tank group communicating valve 11, a hot water function isolating valve 12, a low-temperature system water supplementing isolating valve 13, a circulating water supply temperature regulating valve 14 and a phase change heat storage heat exchanger inlet and outlet isolating valve 19. Namely, a heat storage steam circulation loop, a heat storage water circulation loop and a system water supplementing loop are opened, at the moment, high-temperature superheated steam from a power plant sequentially enters a phase-change heat storage heat exchanger S12 and a heat storage heat exchanger S6 under the standard operations of draining a heating pipe and the like at the heat release steam side, heat exchange and heat storage are respectively carried out on a phase-change heat storage material and a heat storage water tank, the cooled superheated steam returns to the power plant, at the low-temperature hot water side of the heat exchanger, a heat storage circulating pump S10 is started, low-temperature hot water in each unit of a heat storage water tank set S9 is continuously extracted, enters the heat storage heat exchanger S6 to be heated and heated to a given temperature, a water outlet temperature control regulating valve 6 supplies (in a steam-water mixed state) to the heat storage and release water tank set S9-1 during heat storage, a water tank set communicating valve 11 at the bottom of the unit tank is closed after the heat storage water quantity and the temperature of a steam heat storage tank in the heat storage and the heat storage water tank set S9 reach given parameters, at this time, the former steam heat storage tank is changed into a new continuous buffer tank S9-1, one steam heat storage tank S9 and the continuous buffer tank S9-1 are restarted to carry out heat storage and heat exchange, circulation is carried out in sequence until all low-temperature hot water in all the steam heat storage tanks is completely converted into a high-temperature high-pressure heat storage state required by design, meanwhile, a water supplementing and pressurizing pump S11, a low-temperature system water supplementing and isolating valve 13 and a circulating water supply temperature regulating valve 14 are all in an open running state during heat storage, the water supplementing and regulating are carried out on the system according to the heat storage and heat exchange state of the system, so that the heat storage process and parameters reach the optimal heat storage state, the system control basis is that the heat storage load fluctuation in the heat storage process is kept not to exceed the maximum allowable fluctuation range in the heat exchange and the heat storage process is realized by regulating valve and the variable-frequency water pump which are arranged by the system, when each steam heat storage tank unit is combined and operated successively and reaches the state of the designed operation parameters, the energy storage and heat exchange process of the heat storage stage is completed, and meanwhile, the phase change heat storage heat exchanger S12 synchronously reaches the higher value of the designed heat storage capacity.
The working principle flow of the exothermic stage is as follows:
All valves in the system device are in a closed state in the initial state, and after receiving an instruction for starting heat release, the system sequentially opens a steam valve 4 for heat release, a pressure reducing valve 8 for heat release, a third heat storage time isolating valve 9, a water tank group general isolating valve 10, a water tank group communicating valve 11 and a saturated steam regulating valve 16, wherein the first heat storage time isolating valve 17 and an inlet and outlet isolating valve 19 of a phase change heat storage heat exchanger; at this time, the high-temperature hot water stored in the heat storage and release water tank set S9 will supply saturated steam outwards in the form of flash steam through the pressure reducing valve, part of the saturated steam passes through the second branch pipe S5 and the saturated steam regulating valve 16 to the heat release and supply steam pipe S3, the other part of the saturated steam passes through the first heat storage time isolating valve 17, the phase change heat storage heat exchanger inlet and outlet isolating valve 19 enters the phase change heat storage heat exchanger S12 to overheat and raise the temperature, and the output superheated steam temperature given by design is formed by mixing the supply steam pipe S3 and the saturated steam when the heat release is carried out through the first branch pipe S4. And when all the heat storage and release water tank sets S9 are put into operation and the pressure of the externally supplied steam still does not reach the minimum standard of the externally supplied steam, the operation can be regarded as the end of the heat release stage. In terms of operating parameter control, the temperature of the superheated steam can be controlled to a design given parameter by regulating and controlling the flow of saturated steam from the steam pipe directly into the exothermic heat by means of the saturated steam regulating valve 16.
After the two processes of the heat storage stage and the heat release stage, the steam energy storage and heat supply system completes a complete steam storage and heat supply system process of integrating the phase change heat storage technology and the steam heat storage tank technology to absorb the sensible heat of the steam extracted from the power plant for peak regulation (a heat storage and heat release cycle period corresponds to a power plant peak regulation period of extracting the sensible heat of the steam of the power plant for peak regulation).
The utility model provides a thinking and a method for a thermal power plant steam non-condensation energy storage peak regulation system coupling phase change heat storage and steam heat storage tank technology, and particularly provides a method and a plurality of ways for realizing the technical scheme. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (10)
1. The non-condensing energy storage peak regulation system of the thermal power plant is characterized by comprising a heat storage steam inlet pipe (S1), a phase change heat storage heat exchanger (S12), a heat storage heat exchanger (S6), a heat storage return steam pipe (S2), a general steam-water pipe (S8), a heat storage and release water tank group (S9) and a heat release steam supply pipe (S3);
The phase-change heat storage heat exchanger (S12) is connected to the middle part of the heat storage steam inlet pipe (S1) through a loop pipeline; the hot end inlet of the heat storage heat exchanger (S6) is connected with the tail part of the heat storage steam inlet pipe (S1), the hot end outlet of the heat storage heat exchanger (S6) is connected with the head part of the heat storage return steam pipe (S2), the cold end inlet of the heat storage heat exchanger (S6) is connected with a water supplementing pipeline, and the cold end outlet of the heat storage heat exchanger (S6) is connected to the heat storage and release water tank group (S9) through a general steam water pipe (S8); the heat storage and release water tank set (S9) is connected to the heat release steam supply pipe (S3) through a steam pipeline at the top, and the heat storage and release water tank set (S9) is connected to a water supplementing pipeline at the cold end inlet of the heat storage heat exchanger (S6) through a water pipe at the bottom.
2. The thermal power plant steam non-condensation energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology according to claim 1, wherein the heat storage steam inlet pipe (S1) is positioned between two connecting ends of a loop pipeline where the phase change heat storage heat exchanger (S12) is positioned, and is connected to the heat release steam outlet pipe (S3) through a first branch pipe (S4); the heat storage steam inlet pipe (S1) is positioned at the front end of the inlet of the heat storage heat exchanger (S6) and is connected to the heat release steam outlet pipe (S3) through the second branch pipe (S5); the first branch pipe (S4) and the second branch pipe (S5) are respectively provided with a first heat storage time blocking valve (17), and the joint of the rear ends of the heat storage steam inlet pipes (S1) and the loop pipes is provided with a second heat storage time blocking valve (18).
3. The thermal power plant steam non-condensing energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology according to claim 1, wherein the heat storage and release water tank group (S9) comprises a group of steam heat storage tanks and at least one continuous buffer tank (S9-1), and each steam heat storage tank and each continuous buffer tank (S9-1) are connected on a general steam water pipe (S8) in a parallel manner; the top steam pipelines of each steam heat storage tank and the connecting buffer tank (S9-1) are sequentially connected in parallel on a general steam water pipe (S8), and the bottom water pipes of each steam heat storage tank and the connecting buffer tank (S9-1) are connected in parallel; the top steam pipelines of each steam heat storage tank and each continuous buffer tank (S9-1) are respectively provided with a water tank group general isolating valve (10), and the bottom water pipes of each steam heat storage tank and each continuous buffer tank (S9-1) are respectively provided with a water tank group communicating valve (11).
4. The thermal power plant steam non-condensing energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology according to claim 3, wherein after the bottom water pipes of each steam heat storage tank and the continuous buffer tank (S9-1) are connected in parallel to a water main, the water main and a water supplementing pipe led out from a power plant are connected in parallel to a water supplementing pipe at the cold end inlet of a heat storage heat exchanger (S6); the water main is provided with a hot water function isolating valve (12); a low-temperature system water supplementing block valve (13), a heat accumulating water supplementing pressurizing pump (S11) and a circulating water feeding temperature regulating valve (14) are sequentially arranged on a water supplementing pipe led out of the power plant; a heat storage circulating pump (S10) is arranged on a water supplementing pipeline at the cold end inlet of the heat storage heat exchanger (S6).
5. A thermal power plant steam non-condensing energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology according to claim 3, wherein each steam heat storage tank and the continuous buffer tank (S9-1) are respectively provided with a liquid level meter (15) for monitoring the water level in the tank.
6. The thermal power plant steam non-condensation energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology according to claim 1, wherein an inlet end of the general steam-water pipe (S8) is connected to a cold end outlet of a heat storage heat exchanger (S6) through a high temperature water outlet pipe (S7), and a front end of the general steam-water pipe (S8) is connected to a heat release steam supply pipe (S3); a high-temperature water outlet pipe (S7) between a cold end outlet of the heat storage heat exchanger (S6) and a general steam-water pipe (S8) is sequentially provided with a heat storage time outlet water temperature control regulating valve (6) and a heat release time isolating valve (7); a third heat accumulation time blocking valve (9) and a heat release time decompression valve (8) are sequentially arranged at the connecting port of the heat release steam supply pipe (S3) and the general steam water pipe (S8).
7. The thermal power plant steam non-condensation energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology according to claim 1 is characterized in that a heat storage steam inlet valve (1) and a heat storage steam regulating valve (2) are sequentially arranged at the front end of a heat storage steam inlet pipe (S1); the joint of the heat storage steam inlet pipe (S1) and the heat storage heat exchanger (S6) is provided with a steam isolating valve (5).
8. The thermal power plant steam non-condensation energy storage peak shaving system coupling phase change heat storage and steam heat storage tank technology according to claim 1 is characterized in that a heat storage return steam block valve (3) is arranged at the rear end of a heat storage return steam pipe (S2).
9. The thermal power plant steam non-condensing energy storage peak shaving system coupling the phase change heat storage and steam heat storage tank technology according to claim 2, wherein a heat release time steam supply valve (4) is arranged at the rear end of the heat release steam supply pipe (S3), and a saturated steam regulating valve (16) is arranged between the connecting ends of the heat release steam supply pipe (S3) and the first branch pipe (S4) and the second branch pipe (S5).
10. The thermal power plant steam non-condensation energy storage peak shaving system coupling the phase change heat storage and steam heat storage tank technology according to claim 1, wherein front and rear inlets and outlets of the phase change heat storage heat exchanger (S12) are provided with phase change heat storage heat exchanger inlet and outlet shutoff valves (19).
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