CN203586377U - Compressed heat exchange unit - Google Patents

Abstract

The utility model relates to a compression heat exchange unit, which is characterized in that the heat exchange unit includes a compression heat pump, more than one water-water heat exchanger and a connecting pipeline; the connecting pipeline is divided into a primary side pipeline and a Two parts of the secondary side pipeline: the primary side pipeline is connected in series step by step, that is, the primary side pipeline passes through each of the water-water heat exchangers and the evaporator of the compression heat pump in sequence ; The secondary side pipeline is connected to the heat user in the connection mode of parallel connection first and then series connection, step-by-step sequential series connection or independent separation. The utility model can use the heat of the hot water in the primary network in steps, thereby greatly increasing the temperature difference between the supply and return water of the hot water in the primary network of the central heating system, and thus can greatly reduce the initial investment of the pipeline system and the running power of the water pump. It creates conditions for the use of low-grade heat energy from heat sources or even waste heat and waste heat, improves the overall energy utilization efficiency of the system, and reduces heating costs.

Description

Compression heat exchanger unit

technical field

The utility model relates to a heat exchange unit for heating and hot water supply, in particular to a heat exchange unit capable of centrally supplying

The utility model relates to a compression heat exchange unit with a greatly increased temperature difference between primary network hot water supply and return water of a heating system, belonging to the field of energy technology.

Background technique

As the scale of urban central heating continues to increase, the high-temperature hot water generated by centralized heat sources often has to be transported over a long distance to reach the heat user. In order to expand the heating area, reduce transportation costs, and create conditions for the recovery of waste heat from power plants, Fu Lin of Tsinghua University and others proposed an invention patent with the patent number: ZL200810101064.5 and the invention name: "A heat pump heat exchange unit". This patent uses heat exchange and hot water driven absorption heat pump composite technology to solve the above problems, and has been applied in more and more projects. However, in the promotion and application, it was found that the patent has the following problems:

1) Restricted by the water supply temperature of the heating network: Due to the design temperature or operating years of some heating systems, the primary network cannot deliver hot water exceeding 115°C, resulting in low water temperature entering the generator of the absorption heat pump heat exchange unit. For the absorption heat pump, the driving force will be insufficient, so the outlet water temperature of the absorption heat pump heat exchange unit is difficult to drop below 35°C, which limits the expansion of the temperature difference between the supply and return water, and makes the heating capacity insufficient. However, the transformation of the pipeline network is often impossible due to many constraints such as the construction environment, cost, and city appearance.

2) Since the return water temperature is too high, after the return water is transported back to the centralized heat source, the waste heat resources of the waste heat source cannot be effectively recovered, resulting in a reduction in heat supply.

Therefore, in such central heating application places, adopting new technical means to reduce the return water temperature of high-temperature hot water to further increase the temperature difference between the supply and return water will expand the heating radius of central heating and save heating energy consumption. , Reducing the cost of heating has far-reaching significance.

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a compression heat exchange unit that can greatly increase the temperature difference between the hot water supply and return water in the central heating system.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a compression heat exchange unit, which is characterized in that the heat exchange unit includes a compression heat pump, more than one water-water heat exchanger and connecting pipelines; the connection The pipeline is divided into two parts: the primary side pipeline and the secondary side pipeline: the primary side pipeline is connected in series step by step, that is, the primary side pipeline passes through each of the water-water heat exchangers in sequence and the evaporator of the compression heat pump; the secondary side pipelines are connected in parallel first and then in series, that is, more than two secondary side pipelines respectively pass through the condenser of the compression heat pump and several The above-mentioned water-water heat exchangers are combined into one road, and then directly connected to the heat user or connected to the heat user after passing through the other water-water heat exchangers.

In a preferred embodiment, the compression heat pump is a single unit or multiple units connected in series/parallel, and the compression heat pump is a displacement compressor or a centrifugal compressor.

In a preferred embodiment, the heat exchange unit is installed in the heat exchange station between the primary network and the secondary network of the central heating system, and the heating end adopts floor heating, fan coil or radiator.

A compression heat exchange unit, characterized in that the heat exchange unit includes a compression heat pump, more than one water-water heat exchanger and a connecting pipeline; the connecting pipeline is divided into a primary side pipeline and a secondary side pipeline There are two parts of the pipeline: the primary side pipeline is connected in series step by step, that is, the primary side pipeline passes through each of the water-water heat exchangers and the evaporator of the compression heat pump in turn; the two The secondary side pipelines are also connected in series step by step, that is, the secondary side pipelines are connected to heat users after passing through the condenser of the compression heat pump and each of the water-water heat exchangers in sequence.

In a preferred embodiment, the compression heat pump is a single unit or multiple units connected in series/parallel, and the compression heat pump is a displacement compressor or a centrifugal compressor.

In a preferred embodiment, the heat exchange unit is installed in the heat exchange station between the primary network and the secondary network of the central heating system, and the heating end adopts floor heating, fan coil or radiator.

A compression heat exchange unit, characterized in that the heat exchange unit includes a compression heat pump, more than one water-water heat exchanger and a connecting pipeline; the connecting pipeline is divided into a primary side pipeline and a secondary side pipeline There are two parts of the pipeline: the primary side pipeline is connected in series step by step, that is, the primary side pipeline passes through each of the water-water heat exchangers and the evaporator of the compression heat pump in turn; the two The secondary side pipeline adopts an independent and separate connection mode, that is, the secondary side pipeline is directly connected to the heat user after passing through the condenser of the compression heat pump and the water-water heat exchanger.

In a preferred embodiment, the compression heat pump is a single unit or multiple units connected in series/parallel, and the compression heat pump is a displacement compressor or a centrifugal compressor.

In a preferred embodiment, the heat exchange unit is installed in the heat exchange station between the primary network and the secondary network of the central heating system, and the heating end adopts floor heating, fan coil or radiator.

Because the utility model adopts the above technical scheme, it has the following advantages: 1. Since the heat exchange unit of the utility model includes a compression heat pump and a water-water heat exchanger, the hot water of the primary network passes through the water-water heat exchanger and the water-water heat exchanger successively. The evaporator of the compression heat pump uses the heat of the hot water in the primary network in stages, thereby greatly increasing the temperature difference between the supply and return water of the hot water in the central heating system, thereby greatly reducing the initial investment and cost of the pipeline system. The power consumption of water pump operation creates conditions for the use of low-grade heat energy from heat sources and even waste heat, which improves the overall energy utilization efficiency of the system and reduces heating costs. In addition, the utility model can make the return water temperature of the primary network hot water lower than the secondary network hot water inlet temperature, which cannot be realized for conventional heat exchangers. 2. The utility model adopts the compound technology of heat exchange and compression heat pump. Compared with the heat exchange unit adopting the compound technology of heat exchange and absorption heat pump, since it does not need to use high-temperature hot water as the driving source, the hot water inflow to the primary network The temperature requirement can be reduced. In places where hot water exceeding 115°C cannot be transported, such as the old pipeline network renovation, the heating area can be effectively expanded and the heating capacity of the pipeline network can be alleviated while the original pipeline network conditions remain unchanged. contradiction. In addition, since the return temperature of the primary network hot water sent to the centralized heat source can be lowered, it is more beneficial to the recovery of waste heat from the centralized heat source, and more recovered waste heat is enough to offset the energy consumption of the compression heat pump. At the same time, since the heat exchanger and the secondary side pipeline of the compression heat pump are connected in series or in parallel, the outlet water temperature of the compression heat pump can be lower than the hot water return temperature of the secondary network, which further reduces the pressure of the compression heat pump. Energy consumption. 3. The utility model can reduce the return temperature of primary network hot water to 15°C or below, thereby expanding the source of waste heat, increasing the amount of waste heat recovery, and improving the heat supply capacity of the entire system. For example, in the field of wet-cooled thermal power plants or industrial waste heat recovery, a large amount of waste heat is distributed in the range of 15°C-30°C. It can be seen that the utility model adopts the combined technology of heat exchange and compression heat pump to improve the transportation capacity of the pipeline network, effectively recover waste heat resources, expand the heating radius of centralized heating, save heating energy consumption, and reduce heating energy consumption. Costs can have profound implications.

Description of drawings

The utility model is described in detail below in conjunction with accompanying drawing. However, it should be understood that the drawings are only provided for better understanding of the utility model, and they should not be construed as limiting the utility model.

Fig. 1 is the schematic diagram of the heat exchanger unit of the utility model embodiment 1;

Fig. 2 is the schematic diagram of the heat exchange unit of the utility model embodiment 2;

Fig. 3 is the schematic diagram of the heat exchange unit of the utility model embodiment 3;

Fig. 4 is a schematic diagram of the heat exchange unit in Embodiment 4 of the present utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

Fig. 1 shows a heat exchange unit 10 provided according to Embodiment 1 of the present invention. The heat exchange unit 10 includes a compression heat pump 1, a water-water heat exchanger 2 and connecting pipelines. Among them, the connecting pipeline is divided into two parts: the primary side pipeline 31 and the secondary side (user side) pipeline 32: the primary side pipeline 31 is connected in series step by step, that is, the primary side pipeline 31 passes through the The water heat exchanger 2 and the evaporator of the compression heat pump 1; the secondary side pipeline 32 is connected in parallel, that is, the secondary side pipeline 32 is divided into two circuits, one of which passes through the condenser of the compression heat pump unit 1, and the other All the way passes through the water-water heat exchanger 2, and then the two pipelines are merged into one and connected to the heat user.

Figure 2 shows the heat exchange unit 20 provided according to Embodiment 2 of the present utility model. The structure of the heat exchange unit 20 is similar to that of the heat exchange unit 10 in Embodiment 1, the only difference is that the secondary side pipeline 32 adopts two separate channels , that is, one path is directly connected to the heat user after passing through the condenser of the compression heat pump 1, and the other path is directly connected to the heat user after passing through the water-water heat exchanger 2. At this time, the heat exchange unit 20 can output hot water with two parameters, that is, the parameters of the hot water in the secondary network passing through the compression heat pump 1 and the parameters of the hot water in the secondary network passing through the water-water heat exchanger 2 may be different, They are transported to different heat users through their respective secondary side pipelines 32 .

Fig. 3 shows the heat exchange unit 30 provided according to Embodiment 3 of the present invention. The structure of the heat exchange unit 30 is similar to that of the heat exchange unit 10 in Embodiment 1, the only difference is that the secondary side pipeline 32 is also connected in series step by step. The connection method, that is, the secondary side pipeline 32 passes through the condenser of the compression heat pump 1 and the water-water heat exchanger 3 in sequence, and then is connected to the heat user.

Fig. 4 shows the heat exchange unit 40 provided according to Embodiment 4 of the present utility model. The heat exchange unit 40 includes two-stage water-water heat exchangers (this is only an example, not limited thereto), that is, the first-stage water-water heat exchanger Heat exchanger 2a and secondary water-to-water heat exchanger 2b. The primary side pipeline 31 of the heat exchange unit 40 is still connected in series step by step, but the secondary side pipeline 32 is connected in parallel first and then in series, that is, the secondary side pipeline 32 is divided into two circuits, one After passing through the condenser of the compression heat pump 1, the other path passes through the first-stage water-water heat exchanger 2a, and then the two pipelines merge into one path and then pass through the water-water heat exchanger 2b to connect to the heat user.

In a preferred embodiment, the compression heat pump 1 can be a single unit, or multiple units connected in series or in parallel. For the compression heat pump 1, it can be a displacement compressor or a centrifugal compressor.

The process of applying the utility model in a central heating system will be described below in conjunction with the heat exchange unit 10 provided in Embodiment 1 and the heat exchange unit 40 provided in Embodiment 4.

Example 1: As shown in Figure 1, in actual operation, the 110°C primary network hot water output from the centralized heat source first enters the water-water heat exchanger 2 as a heating heat source to heat the secondary network hot water; heat release After cooling down to about 50°C, it flows out of the water-water heat exchanger 2, and then enters the evaporator of the compression heat pump 1 as a low-grade heat source. After cooling down to about 15°C, it flows out and returns to the centralized heat source, and so on.

The 45°C secondary network hot water return water output by the heat user is divided into two paths and enters the heat exchange unit 10: one path enters the condenser of the compression heat pump 1 to absorb heat, and flows out after being heated to about 60°C; the other path enters the water- The water heat exchanger 2 exchanges heat with the hot water of the primary network, and flows out after being heated to about 60°C, and the two channels of 60°C hot water are merged together and then sent to the heat user. It can be seen that the heat exchange unit 10 provided in this embodiment adopts the combination of heat pump and heat exchanger, which can effectively carry out cascaded utilization of high-temperature hot water, realize a temperature difference between supply and return water of 95°C, and produce water that satisfies the needs of use. heating or domestic hot water on request. The heat exchange unit 10 is generally installed in each heat station of a large-scale central heating system, especially for the heat exchange station of the primary network and the secondary network, and the heating terminal can be in the form of floor heating, fan coil or radiator.

Embodiment 4: As shown in Figure 4, in actual operation, the 110°C primary network hot water output from the centralized heat source first enters the secondary water-water heat exchanger 2b as a heating heat source to heat the secondary network hot water; After cooling down to about 65°C, it flows out, and then enters the primary water-water heat exchanger 2a to heat the hot water in the secondary network; after cooling down to about 50°C, it flows out, and then enters the evaporator of the compression heat pump 1 as a low-level heat source , exothermic cooling down to about 15 ° C, then flow out, return to the centralized heat source, and so on.

The 45°C secondary network hot water return water output by the heat user is divided into two paths and enters the heat exchange unit 40: one path enters the condenser of the compression heat pump 1 to absorb heat, and flows out after being heated to about 60°C; the other path enters the first stage The water-water heat exchanger 2a exchanges heat with the hot water of the primary network, and flows out after being heated to about 60°C; the two paths of 60°C hot water merge together and enter the secondary water-water heat exchanger 2b again to be connected with the primary network The network hot water is used for heat exchange, and after being heated to about 70°C, it is sent to the heat user. It can be seen that the heat exchange unit 40 provided in this embodiment adopts the combination of heat pump and two-stage heat exchanger, which can effectively carry out cascaded utilization of high-temperature hot water, realize a temperature difference between supply and return water of 95°C, and produce high-quality water. High heating or domestic hot water. The heat exchange unit 40 is generally installed in each heat station of a large-scale central heating system, especially for the heat exchange station of the primary network and the secondary network, and the heating terminal adopts the form of a radiator.

The above-mentioned embodiments are only used to further describe the purpose, technical solutions and beneficial effects of the utility model in further detail, and are not used to limit the utility model. Any modifications made within the spirit and principles of the utility model, Equivalent replacements, improvements, etc., should all be included within the protection scope of the present utility model.

Claims (9)

1. A compression heat exchange unit, characterized in that the heat exchange unit comprises a compression heat pump, more than one water-water heat exchanger and connecting pipelines; The connecting pipeline is divided into two parts: the primary side pipeline and the secondary side pipeline: the primary side pipeline is connected in series step by step, that is, the primary side pipeline passes through each of the water-water The heat exchanger and the evaporator of the compression heat pump; the secondary side pipelines are connected in parallel and then in series, that is, two or more secondary side pipelines respectively pass through the condenser of the compression heat pump and several of the water-water heat exchangers are merged into one road, and then directly connected to the heat user or connected to the heat user after passing through the remaining water-water heat exchangers. 2. The compression heat exchange unit according to claim 1, wherein the compression heat pump is a single unit or multiple units connected in series/parallel, and the compression heat pump is a displacement compressor or a centrifugal compressor machine. 3. The compression heat exchange unit according to claim 1 or 2, characterized in that the heat exchange unit is installed in the heat exchange station of the primary network and the secondary network of the central heating system, and the heating terminal adopts floor heating, Fan coil or radiator. 4. A compression heat exchange unit, characterized in that the heat exchange unit includes a compression heat pump, more than one water-water heat exchanger and connecting pipelines; The connecting pipeline is divided into two parts: the primary side pipeline and the secondary side pipeline: the primary side pipeline is connected in series step by step, that is, the primary side pipeline passes through each of the water-water The heat exchanger and the evaporator of the compression heat pump; the secondary side pipelines are also connected in series step by step, that is, the secondary side pipelines pass through the condenser of the compression heat pump and each The water-water heat exchanger is then connected to heat consumers. 5. The compression heat exchange unit according to claim 4, wherein the compression heat pump is a single unit or multiple units connected in series/parallel, and the compression heat pump is a displacement compressor or a centrifugal compressor machine. 6. The compression heat exchange unit according to claim 4 or 5, characterized in that, the heat exchange unit is installed in the heat exchange station of the primary network and the secondary network of the central heating system, and the heating terminal adopts floor heating, Fan coil or radiator. 7. A compression heat exchange unit, characterized in that the heat exchange unit includes a compression heat pump, more than one water-water heat exchanger and connecting pipelines; The connecting pipeline is divided into two parts: the primary side pipeline and the secondary side pipeline: the primary side pipeline is connected in series step by step, that is, the primary side pipeline passes through each of the water-water The heat exchanger and the evaporator of the compression heat pump; the secondary side pipeline adopts an independent and separate connection mode, that is, the secondary side pipeline passes through the condenser of the compression heat pump and the water-water The heat exchangers are respectively directly connected to heat users. 8. The compression heat exchange unit according to claim 7, wherein the compression heat pump is a single unit or multiple units connected in series/parallel, and the compression heat pump is a displacement compressor or a centrifugal compressor machine. 9. The compression heat exchange unit according to claim 7 or 8, characterized in that, the heat exchange unit is installed in the heat exchange station of the primary network and the secondary network of the central heating system, and the heating terminal adopts floor heating, Fan coil or radiator.

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