Electric boiler high-temperature heat storage and heat pump coupling system

Abstract

The utility model provides an electric boiler high-temperature heat storage and heat pump coupling system which comprises an electric boiler module, a high-temperature heat storage tank module and a heat pump module, the electric boiler module comprises an electric boiler body, a heat exchanger and a condensate water tank, and the water outlet end of the electric boiler module and the water outlet end of the high-temperature heat storage tank module are connected with a water distributor and a water inlet main pipe. A heat storage tank is arranged in the high-temperature heat storage tank module, the heat pump module comprises an air source heat pump and a system circulating water pump, the water inlet end of the system circulating water pump is connected with a water collector and a water return main pipe, the water inlet end of the system circulating water pump is further connected with a pressure relief adjusting valve and an expansion water tank, and the water inlet end of the expansion water tank is connected with a secondary network water supplementing main pipe. And connecting branch pipes are arranged at the inner ends of the electric boiler module, the high-temperature heat storage tank module and the heat pump module. The problems that due to the novel energy storage design, the temperature of hot water output by a heat pump is low in extreme weather and cannot meet the use requirement of a user, and the use cost of an electric boiler is high are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to novel energy storage technical field, specifically, it relates to electric boiler high temperature heat storage and heat pump coupling system. BACKGROUND

[0002] Although air source heat pump heating consumes electric energy, its comprehensive energy efficiency is excellent, COP is greater than or equal to 2 under general working conditions (COP can reach more than 2.4 when the ambient temperature is above-5 DEG C), by combining with electric boiler heat storage system, the utilization efficiency of electric energy can be improved, and the heating cost of user is greatly reduced.

[0003] In the prior art, with the gradual formation of high-proportion new energy power system, and the adjustment of new round peak-valley time-of-use electricity price mechanism, the upper and lower floating proportion of peak electricity price and valley electricity price is higher, which means that the peak-valley electricity price difference is further widened, and the new energy storage technology can utilize the peak-valley time-of-use electricity price mechanism to store energy at low electricity price and provide heat at high electricity price to earn the electricity price difference, however, due to the electric capacity fee, the actual operation cost is still high, therefore, the electric boiler high temperature heat storage and heat pump coupling system is improved. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at: aiming at the design of the current new energy storage, the problem that the output hot water temperature of heat pump is low under extreme weather and cannot meet the use requirement of user, and the high use cost of electric boiler.

[0005] In order to realize the above-mentioned utility model purposes, the utility model provides the following technical scheme:

[0006] The electric boiler high temperature heat storage and heat pump coupling system is to improve the above-mentioned problems.

[0007] The application is as follows:

[0008] The electric boiler high temperature heat storage and heat pump coupling system comprises an electric boiler module, a high temperature heat storage tank module and a heat pump module, the electric boiler module comprises an electric boiler body, a heat exchanger and a condensate tank, a water distributor and a water inlet mother pipe are connected to the water outlet end of the electric boiler module and the high temperature heat storage tank module, a heat storage tank is arranged in the high temperature heat storage tank module, the heat pump module comprises an air source heat pump and a system circulating water pump, a water collector and a return water mother pipe are connected to the water inlet end of the system circulating water pump, a pressure relief regulating valve and an expansion tank are also connected to the water inlet end of the system circulating water pump, a secondary network water supplement mother pipe is connected to the water inlet end of the expansion tank, and connecting branch pipes are arranged at the inner ends of the electric boiler module, the high temperature heat storage tank module and the heat pump module.

[0009] As the preferred technical scheme of the application, the heat storage tank is a small inclined temperature layer high efficiency heat storage tank, water distributors are arranged at the upper and lower water inlet and outlet ports of the heat storage tank, and the high temperature heat storage tank module is further provided with a heat storage water pump, a system circulating water pump and a water supplement pump.

[0010] As the preferred technical scheme of the present application, the air source heat pump is a low-temperature air source heat pump, the air source heat pump can be used for ultra-low temperature heating of minus 35 DEG C, and the number of air source heat pumps is set to several groups, and the several groups of air source heat pumps output hot water for heating in parallel or series-parallel combination mode.

[0011] As the preferred technical scheme of the present application, the electric boiler module, the high-temperature heat storage tank module and the heat pump module are provided with electric regulating valves and electric on-off valves.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] In the scheme of the present application:

[0014] 1. The heat storage energy is stored during the valley electricity period with low electricity price, and the heating is provided during the peak electricity period with high electricity price to earn the electricity price difference, and the high-temperature heat storage can reduce the volume of the heat storage tank and the floor area occupied by the heat storage tank.

[0015] 2. The air source heat pump provides heating, and although the consumed is also electric energy, it has excellent comprehensive energy efficiency, and the COP is greater than or equal to 2 under general working conditions (the COP can be greater than or equal to 2.4 when the environmental temperature is greater than or equal to-5 DEG C), which can improve the utilization efficiency of electric energy and greatly reduce the heating cost of the user.

[0016] 3. Three small modules are coupled, which can solve the problem of low output hot water temperature of the heat pump in low-temperature weather (part of the high-temperature hot water in the heat storage tank is mixed), and can also ensure economic operation of the user.

[0017] 4. The parallel coupling of the three small modules can ensure safe and reliable operation of the entire system, and even if there is a problem in a small module, the system can be switched to another two modules at any time.

[0018] 5. The pressure of the system pipe network is directly used to set the pressure of the high-temperature heat storage tank module, and a separate pressure setting system is not needed. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The present application provides the overall structure schematic diagram of the electric boiler high-temperature heat storage and heat pump coupling system. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0021] Therefore, the following detailed description of embodiments of the present application is not intended to limit the scope of the present application as claimed, but merely represents some embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application. It should be noted that, in the case of no conflict, the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other.

[0022] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] As shown in Figure 1 The present embodiment proposes an electric boiler high-temperature heat storage and heat pump coupling system, which comprises an electric boiler module, a high-temperature heat storage tank module and a heat pump module. The electric boiler module comprises an electric boiler body, a heat exchanger and a condensate tank. The water outlet ends of the electric boiler module and the high-temperature heat storage tank module are connected with a water distributor and a water inlet main pipe. The high-temperature heat storage tank module comprises a heat storage tank. The heat pump module comprises an air source heat pump and a system circulating water pump. The water inlet end of the system circulating water pump is connected with a water collector and a return water main pipe. The water inlet end of the system circulating water pump is also connected with a pressure relief regulating valve and an expansion water tank. The water inlet end of the expansion water tank is connected with a secondary network water supplement main pipe. The inner ends of the electric boiler module, the high-temperature heat storage tank module and the heat pump module are all provided with connecting branch pipes.

[0024] The three small modules are independent and associated with each other, and are connected in parallel. The system can adapt to the heating demand of different parameters on the user side, and has strong inclusiveness.

[0025] The heat storage tank is a small inclined temperature layer high-efficiency heat storage tank. Water distributors are arranged at the upper and lower water inlets and outlets of the heat storage tank. The high-temperature heat storage tank module is also provided with a heat storage water pump, a system circulating water pump and a water supplement pump.

[0026] The air source heat pump is a low-temperature type air source heat pump. The air source heat pump can be used for ultra-low temperature heating of minus 35 DEG C. The number of air source heat pumps is set to several groups. The several groups of air source heat pumps output hot water for heating in parallel or series-parallel combination mode.

[0027] Electric regulating valves and electric on-off valves are arranged between the electric boiler module, the high-temperature heat storage tank module and the heat pump module.

[0028] The electric boiler module adopts electric heating to output hot water or steam, and outputs high-temperature hot water through the heat exchanger. The electric boiler has high requirements on water quality, while the high-temperature heat storage tank module and the heat pump module have relatively low requirements on water quality. Through heat exchange of the heat exchanger, the water quality of the electric boiler can be avoided to be affected;

[0029] The high-temperature heat storage tank module is used for storing high-temperature hot water generated by heat exchange of an electric boiler. The heat storage tank is a small-temperature-gradient high-efficiency heat storage tank, and water distributors are arranged at the upper and lower water inlets and outlets of the heat storage tank, so that the temperature gradient can be effectively controlled, and the utilization rate of the heat storage tank is improved. Meanwhile, reliable heat preservation is performed on the outer surface of the tank body, so that heat loss can be effectively reduced.

[0030] The heat pump module can realize ultra-low temperature heating of 35 DEG C below zero by using a low-temperature air source heat pump. A plurality of heat pumps are connected in series and parallel to output hot water meeting the requirements, and meanwhile, the water flow of the system circulation and the electric power of the circulating water pump are reduced. The water capacity of the pipe network is utilized, and a hot water tank does not need to be arranged.

[0031] The three modules are connected in parallel through pipelines to form a plurality of combined operation modes, such as heat pump heating alone, electric boiler heating alone, heat storage tank heating alone, heat pump and electric boiler combined heating, heat pump and heat storage tank combined heating, electric boiler and heat storage tank combined heating, heat pump, electric boiler and heat storage tank combined heating and the like, so that an optimal and economical operation mode can be provided for users according to actual conditions. The plurality of modes can be used as backup for each other, so that the system is more reliable and safe.

[0032] In use, the application has the advantages that:

[0033] In the heat storage process, steam (or high-temperature hot water) generated by the electric boiler is output from the upper portion of the boiler, and is condensed into hot water (high-temperature hot water is cooled to low-temperature hot water) after heat exchange of the heat exchanger. The "cold water" at the bottom of the heat storage tank is input into the second side of the heat exchanger through the heat storage pump, and high-temperature hot water is output to the top of the heat storage tank after being heated by the heat exchanger, and is uniformly input into the heat storage tank through the water distributor at the top of the heat storage tank, until the water temperature at the bottom of the heat storage tank reaches the rated temperature, and the heat storage is completed.

[0034] In the heat release process, cold water in the pipe network is uniformly input into the heat storage tank through the water distributor at the bottom of the heat storage tank, and high-temperature hot water is output from the top of the heat storage tank, and is mixed with the hot water output by the heat pump in the pipe network through the electric regulating valve to supply users, so that the water temperature output by the heat pump can be improved, and the system heating requirement under extreme weather can be ensured.

[0035] In the heat pump heating process, a plurality of air source heat pumps are installed in the system pipe network in series and parallel, the compressor works to compress refrigerant, absorbs heat from air into high-temperature steam through the evaporator, and then heats the hot water in the pipe network system through the condenser, and outputs the hot water to be used by users. Under non-extreme weather, the operation of the heat pump can meet the use requirements of users, but the temperature of the hot water output by the heat pump is low under extreme weather, and other methods need to be used for heat supplement. Through coupling with the electric boiler and high-temperature heat storage tank module, hot water meeting the requirements can be output.

[0036] Through the design of the application, the problem that the temperature of the hot water output by the heat pump is low under extreme weather and cannot meet the use requirements of users is solved, and the problem that the use cost of the electric boiler is high is also solved.

[0037] The above embodiments are only used to illustrate the technical solutions described in the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above embodiments, the present application is not limited to the above specific embodiments. Therefore, any modification or equivalent replacement of the present application is allowed. Any technical solution and improvement that does not deviate from the spirit and scope of the present application is included in the scope of the claims of the present application.

Claims

1. A high-temperature heat storage and heat pump coupling system for electric boilers, comprising an electric boiler module, a high-temperature heat storage tank module, and a heat pump module, characterized in that, The electric boiler module includes an electric boiler body, a heat exchanger, and a condensate tank. The outlet ends of the electric boiler module and the high-temperature heat storage tank module are connected to a water distributor and an inlet header. The high-temperature heat storage tank module includes a heat storage tank. The heat pump module includes an air source heat pump and a system circulating water pump. The inlet end of the system circulating water pump is connected to a water collector and a return header. The inlet end of the system circulating water pump is also connected to a pressure relief regulating valve and an expansion tank. The inlet end of the expansion tank is connected to a secondary network makeup water header. The inner ends of the electric boiler module, the high-temperature heat storage tank module, and the heat pump module are all equipped with connecting branch pipes.

2. The electric boiler high-temperature heat storage and heat pump coupling system according to claim 1, characterized in that, The heat storage tank is a high-efficiency heat storage tank with a small inclined temperature layer. The upper and lower inlet and outlet of the heat storage tank are equipped with water distributors. The high-temperature heat storage tank module is also equipped with a heat storage water pump, a system circulating water pump, and a water replenishment pump.

3. The electric boiler high-temperature heat storage and heat pump coupling system according to claim 2, characterized in that, The air source heat pump is a low-temperature air source heat pump, which can be used for ultra-low temperature heating down to -35°C. The number of air source heat pumps is set to several groups, and the several groups of air source heat pumps output hot water for heating in parallel or series-parallel combination.

4. The electric boiler high-temperature heat storage and heat pump coupling system according to claim 1, characterized in that, Electric regulating valves and electric switching valves are installed between the electric boiler module, the high-temperature heat storage tank module, and the heat pump module.

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