Central heating energy station in northern area

Abstract

The utility model discloses a central heating energy station in northern areas, which belongs to the field of heating energy systems and comprises a valve body and an ACS air source heat pump unit group. The ACS air source heat pump unit group is communicated with a Heat electric heater and a WM flowmeter through a pipeline; the Heat electric heater is communicated with the EST energy storage tank through a pipeline, and the Heat electric heater is further sequentially communicated with a DV1 conversion valve group, a heat meter HM and a V1 tail end water supply hand valve through pipelines; the WCS water source heat pump is communicated with an EST energy storage tank through a pipeline, and an evaporator of the WCS water source heat pump is further communicated with a WM flowmeter through an ASCP source side circulating pump and an SV2 check valve in sequence. The utility model aims to solve the problems of stable heat supply during concentrated defrosting of air sources in high-humidity weather and capability attenuation of compensating air sources at night in low-temperature weather.

Description

Technical Field

[0001] The present invention relates to the field of energy supply, and more particularly to a centralized heating energy station in northern China. Background Art

[0002] Traditional coal-fired heating systems, due to their high energy consumption and environmental pollution, are increasingly unable to meet the needs of modern society. The demand for heating systems is particularly urgent in northern China, where winters are long and harsh. While existing centralized heating systems have achieved a certain degree of large-scale heating, they still face challenges. They lack efficient technical solutions for ensuring stable heating during centralized defrosting in high-humidity weather and compensating for the loss of air source capacity at night during cold weather. Summary of the Invention

[0003] 1. Technical problems to be solved

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide a centralized heating energy station in the northern region, aiming to solve the problem of stable heating during centralized defrosting of air sources in high-humidity weather and compensate for the attenuation of air source capacity at night in low-temperature weather.

[0005] 2. Technical solution

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A centralized heating energy station in northern China, comprising

[0008] ACS air source heat pump group; the ACS air source heat pump group is connected to the Heat electric heater and WM flow meter through a pipeline; the Heat electric heater is connected to the EST energy storage tank through a pipeline, and the Heat electric heater is also connected to the DV1 conversion valve group, the heat meter HM, and the V1 end water supply manual valve in sequence through pipelines;

[0009] WCS water source heat pump; the WCS water source heat pump is connected to the EST energy storage tank through a pipeline, and the evaporator of the WCS water source heat pump is also connected to the WM flow meter through the ASCP source side circulation pump and the SV2 check valve in sequence.

[0010] As a preferred solution of the present invention, the Heat electric heating is also connected to the evaporator of the WCS water source heat pump through the DM1 electric regulating valve, and the EST energy storage tank is also connected to the pipeline between the Heat electric heating and the DV1 conversion valve group through a pipeline.

[0011] As a preferred solution of the present invention, the WM flowmeter is also connected to the DV2 conversion valve group, the TLCP end circulation pump, and the V2 end return water manual valve in sequence through pipelines.

[0012] As a preferred solution of the present invention, the DV2 conversion valve group and the TLCP terminal circulation pump pipeline are connected to the condenser of the WCS water source heat pump through the DV3 conversion valve group.

[0013] As a preferred solution of the present invention, the evaporator of the WCS water source heat pump is also connected to the HSCP feedback circulation pump, the SV1 check valve, and the condenser of the WCS water source heat pump in sequence through pipelines.

[0014] As a preferred solution of the present invention, the TLCP terminal circulation pump is connected to the DM2 terminal pipe network hydraulic balance regulating valve through a pipeline and then connected to the heat meter HM.

[0015] As a preferred solution of the present invention, the SV1 check valve is also connected to the pipeline between the DV1 conversion valve group and the heat meter HM through a pipeline, and the HSCP feedback circulation pump is also connected to the DM1 electric regulating valve and the EST energy storage tank through pipelines respectively.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. Equipped with both air source heat pump ACS and water source heat pump WCS units, the automatic control system switches the valve group DV1 / DV2 / DV3 and selectively opens each device, enabling two operating modes: direct air source supply and combined air source + water source supply.

[0019] 2. Equipped with an energy storage tank (EST), this system can store large amounts of water or add a phase change material (PCM) at approximately 28°C to a smaller volume, generating significant thermal energy storage. This can be used to reduce costs and increase efficiency under peak and valley electricity pricing policies, ensure stable heating during centralized defrosting of air sources in high-humidity weather, and compensate for the loss of air source capacity at night during low temperatures.

[0020] 3. Equipped with a combined heat energy feedback device HSCP, it can ensure stable operation of the combined heat energy supply in extremely low temperature climates when the air source capacity is severely attenuated and the heat storage capacity is exhausted.

[0021] 4. The switching between direct supply and combined supply is simple and reliable. The various matching controls of energy storage and feedback devices are simple and efficient, without obvious shortcomings. It can well balance the contradiction between equipment investment and extreme weather response, and maximize the overall operational benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 Schematic diagram of the process of the present invention Figure 1 ;

[0024] Figure 3 Schematic diagram of the process of the present invention Figure 2 ;

[0025] Figure 4 Schematic diagram of the process of the present invention Figure 3

[0026] Letter Description:

[0027] ACS - air source heat pump group, extracts heat energy from the air into the circulating water;

[0028] WCS--water source heat pump unit, draws heat energy from the source side circulating water and outputs it to the terminal circulating water; DV1 / DV2 / DV3--direct / combined supply conversion valve group;

[0029] TLCP - terminal circulation variable frequency water pump, forms a hot water supply cycle between the energy station equipment and the end user; ASCP - source side circulation variable frequency water pump, forms a hot water exchange cycle between the air source and water source heat pump equipment. It can also be used for heat storage cycle under direct supply mode;

[0030] EST - energy storage tank, storing water and filled with 28℃ phase change thermal storage material;

[0031] DM1--Thermal storage tank bypass regulating valve, used to slow down the release of stored heat;

[0032] DM2--Terminal pipe network hydraulic balance regulating valve, used to ensure the water flow of the heat pump unit:

[0033] HSCP--used to balance the capacity of air source and water source heat pump in the combined supply mode (if the water source heat pump has good dynamic adjustment ability, it can be omitted). Px--pressure sensor, monitoring the supply and return water pressure of the terminal pipe network Tx--temperature sensor, monitoring the water temperature at each key point of the pipeline

[0034] HM--Monitor the end water supply flow and calculate the heat supply

[0035] WM--flow meter, monitors the water flow of air source heat pump. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0039] Example:

[0040] See also Figure 1 , a centralized heating energy station in the northern region, including an ACS air source heat pump group; the ACS air source heat pump group is connected to the Heat electric heating and the WM flow meter through a pipeline to realize the replenishment of heat energy and the precise control of flow; the Heat electric heating is connected to the EST energy storage tank through a pipeline to ensure the effective storage and utilization of heat energy. The Heat electric heating is also connected to the DV1 conversion valve group, the heat meter HM, and the V1 end water supply manual valve in sequence through a pipeline to realize automatic adjustment and monitoring of the system; the WCS water source heat pump is connected to the EST energy storage tank through a pipeline, and the high energy efficiency of the water source heat pump is used for heating. The evaporator of the WCS water source heat pump is also connected to the WM flow meter through the ASCP source side circulation pump and the SV2 check valve in sequence to ensure the stable operation and flow control of the water source heat pump system.

[0041] Specifically, the Heat electric heating is also connected to the evaporator of the WCS water source heat pump through the DM1 electric regulating valve. The DM1 electric regulating valve is used to adjust the hot water flow to the evaporator. The EST energy storage tank is also connected to the pipeline between the Heat electric heating and the DV1 conversion valve group through the pipeline. The WM flowmeter is also connected to the DV2 conversion valve group, the TLCP terminal circulation pump, and the V2 terminal return water manual valve in sequence through the pipeline. The DV2 conversion valve group and the TLCP terminal circulation pump pipeline are connected to the condenser of the WCS water source heat pump through the DV3 conversion valve group. The TLCP terminal circulation pump is connected to the DM2 terminal pipeline network hydraulic balance regulating valve through a pipeline and then connected to the heat meter HM to ensure the hot water circulation of the end users. The SV1 check valve is also connected to the pipeline between the DV1 conversion valve group and the heat meter HM through a pipeline. The evaporator of the WCS water source heat pump is also connected to the HSCP feedback circulation pump, the SV1 check valve, and the condenser of the WCS water source heat pump in sequence through a pipeline, forming a closed circulation system to improve the working efficiency of the heat pump. The SV1 check valve can prevent water backflow and ensure the safe and stable operation of the system. The HSCP feedback circulation pump is also connected to the DM1 electric control valve and the EST energy storage tank through pipelines, further improving the thermal efficiency and stability of the system.

[0042] It should be further explained that in normal weather (generally above -10°C) and non-high humidity, direct heat supply from an air source heat pump (using only the air source heat pump unit and the TLCP terminal circulation pump) is usually adopted, which has better economic benefits. If there are excellent peak-valley electricity price preferential policies, energy storage devices can be used to further improve economic benefits: During off-peak periods when ambient temperatures are high, direct heat supply from an air source heat pump combined with heat storage can be used (operating the ASCP source-side circulation pump until the EST heat energy is fully stored). During peak periods, the air source heat pump is discontinued and replaced with a WCS water source heat pump to transport the stored heat energy from the EST to the terminal, significantly improving energy efficiency compared to air source heat. In high-humidity and frosty weather (above -5°C, high humidity), where the air source is extremely prone to frost, a two-stage combined supply method of air source heat pump and water source heat pump can be used to achieve a stable heating effect. When the air source has sufficient capacity, it constantly outputs hot water (T1) above 30°C. During the EST, some of the heat energy is stored in a tank, cooling it to 28°C for use by the water-source heat pump. Once the EST is fully charged, the air source output water temperature (T1) is adjusted to 28-30°C, just enough to meet the water-source heat pump's maximum water temperature requirement. Frosting of the air source reduces capacity, especially when multiple units are defrosting simultaneously. The output water temperature drops below 28°C, allowing the EST to naturally release heat, maintaining the water-source heat pump's 28°C temperature. During extremely cold weather and at night, when the equipment's total load capacity reaches its limit, a two-stage cascade system is employed. Simultaneously, by adjusting DM1, the release of stored heat from the EST is minimized, while still meeting the water-source heat pump's minimum water temperature requirement, to ensure smooth system operation. Once the EST has fully discharged its required heat, if the air source capacity cannot meet the water-source heat pump's demand (often due to a lack of accommodativeness to the source-side capacity), the feedback loop pump (HSCP) can be activated to forcibly match supply and demand.

[0043] For specific application 1, see Figure 2 The direct heating process for air source heat pumps involves opening the DV1 / DV2 conversion valve group, closing the DV2 conversion valve group, operating the TLCPP terminal circulation pump, and running the ACS air source heat pump group. The direct thermal storage process for air source heat pumps involves operating the ACS air source heat pump group and running the ASCPP source-side circulation pump until the EST storage tank temperature (T5) exceeds 28°C. The thermal storage process can run simultaneously with the heating process or independently.

[0044] For specific application 2, see Figure 3 , air source heat pump combined heating process: DV1 conversion valve group / DV2 conversion valve group is closed, DV3 conversion valve group is opened, TLCP terminal circulation pump / WCS water source heat pump is running, ASCP source side circulation pump / ACS air source heat pump group is running,

[0045] It should be noted that the heat storage regulation of the air source heat pump combined heating process refers to Figure 4 , specifically for thermal storage operating conditions: T1>30℃, T5=28℃

[0046] Fully charged operating conditions: T1 = (28-30°C), T5 = T1

[0047] Exothermic operating conditions: T1<28℃, T5=28℃

[0048] Slow heat release measures: open DM1 as much as possible to reduce EST heat release, while maintaining T2 not lower than 18℃ Feedback compensation measures: close DM1, open DV1, adjust HSCP frequency, control heat feedback,

[0049] Maintain T5 above 25℃.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, and these changes should be covered by the scope of protection of the present invention.

Claims

1. A centralized heating energy station in northern China, characterized in that: include ACS air source heat pump group; the ACS air source heat pump group is connected to the Heat electric heater and WM flow meter through a pipeline; the Heat electric heater is connected to the EST energy storage tank through a pipeline, and the Heat electric heater is also connected to the DV1 conversion valve group, the heat meter HM, and the V1 end water supply manual valve in sequence through pipelines; WCS water source heat pump; the WCS water source heat pump is connected to the EST energy storage tank through a pipeline, and the evaporator of the WCS water source heat pump is also connected to the WM flow meter through the ASCP source side circulation pump and the SV2 check valve in sequence.

2. A centralized heating energy station in northern China according to claim 1, characterized in that: The Heat electric heater is also connected to the evaporator of the WCS water source heat pump through the DM1 electric regulating valve, and the EST energy storage tank is also connected to the pipeline between the Heat electric heater and the DV1 conversion valve group through a pipeline.

3. A centralized heating energy station in northern China according to claim 1, characterized in that: The WM flowmeter is also connected to the DV2 conversion valve group, the TLCP terminal circulation pump, and the V2 terminal return water manual valve in sequence through pipelines.

4. A centralized heating energy station in northern China according to claim 3, characterized in that: The DV2 conversion valve group and the TLCP terminal circulation pump pipeline are connected to the condenser of the WCS water source heat pump through the DV3 conversion valve group.

5. A centralized heating energy station in northern China according to claim 1, characterized in that: The evaporator of the WCS water source heat pump is also connected to the HSCP feedback circulation pump, the SV1 check valve, and the condenser of the WCS water source heat pump in sequence through pipelines.

6. A centralized heating energy station in northern China according to claim 3, characterized in that: The TLCP terminal circulation pump is connected to the DM2 terminal pipe network hydraulic balance regulating valve through a pipeline and then connected to the heat meter HM.

7. A centralized heating energy station in northern China according to claim 5, characterized in that: The SV1 check valve is also connected to the pipeline between the DV1 conversion valve group and the heat meter HM through a pipeline, and the HSCP feedback circulation pump is also connected to the DM1 electric regulating valve and the EST energy storage tank through pipelines.

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