CN202648137U - Sewage-source heat pump domestic hot water multi-echelon supply system based on low grade waste heat recovery - Google Patents

Abstract

The utility model discloses a sewage source heat pump domestic hot water cascade supply system based on low-level waste heat recovery. Valves and city water supply pipes, etc. The preheating device includes a flow splitting device, a multi-branch heat exchanger and a collecting device, and the sewage source heat pump includes a compressor, a sewage side heat exchanger, an expansion valve and a use side heat exchanger. The urban water supply pipeline process is as follows: part of the urban water supply is used as hot water for users after being preheated by a multi-branch heat exchanger, and the other part enters the sewage source heat pump, and part of it is used as hot water for users after being heated by the sewage source heat pump. It enters the electric heating device and heats it to provide boiling water for users. The utility model makes full use of the low-level waste heat in the sewage, reduces the power consumption in heating; fully considers the domestic hot water demand of users, and supplies hot water in steps.

Description

Sewage source heat pump domestic hot water cascade supply system based on low-level waste heat recovery

technical field

The utility model relates to a sewage source heat pump domestic hot water cascade supply system, in particular to a sewage source heat pump domestic hot water cascade supply system based on low-level waste heat recovery.

Background technique

At present, electric heating is mostly used for domestic hot water supply. The disadvantage is that the heating energy consumption is relatively high, and the temperature of the hot water supplied is single, which makes it difficult to meet the various needs of daily life. On the other hand, in family life, high-temperature domestic wastewater, such as shower wastewater, is discharged directly at a higher temperature, which not only causes waste of water resources, but also causes thermal pollution to the environment.

As a result, many new concepts have been proposed for the existing situation. Chinese patent CN 201476188 U discloses a direct evaporative fresh air air treatment system using high-temperature domestic wastewater as a heat source. This system effectively utilizes the waste heat of sewage sources, but uses water pumps to transport water sources many times, ignoring the urban water supply itself. Pressure head, the unreasonable use of this kind of water pump has caused a waste of resources and increased energy consumption for equipment operation.

Contents of the invention

Aiming at the shortcomings of the existing domestic hot water supply system, this utility model proposes a sewage source heat pump domestic hot water cascade supply system based on low-level waste heat recovery. This system can effectively utilize the low-level waste heat in sewage to realize the cascade supply of domestic hot water .

The technical scheme that the utility model adopts is as follows:

Sewage source heat pump domestic hot water cascade supply system based on low-level waste heat recovery, including sewage storage tank, preheating device, sewage source heat pump, sewage side water pump, electric heating device, use side water pump, first three-way valve, second and third through valve, high-temperature sewage water pipe and urban water supply pipe, the preheating device includes a flow diversion device, a multi-branch heat exchanger and a flow collecting device connected in sequence; the sewage source heat pump includes a compressor connected in sequence, a sewage side heat exchange device, expansion valve, and use-side heat exchanger; the preheating device is set in the sewage reservoir, and the flow-collecting device is connected with the use-side water pump, the first three-way valve, the use-side heat exchanger, urban water supply pipes, and the second The two and three-way valves are connected to the electric heating device in sequence; the sewage side heat exchanger is connected to the sewage storage tank through the high temperature sewage water pipe and the sewage side water pump.

When the system is running, the urban water supply enters the multi-branch heat exchanger through the diversion device; after the sufficient heat exchange with the sewage is completed in the multi-branch heat exchanger, it is collected by the header device and then transported by the side water pump Enter the urban water supply pipe; at this time, the preheated urban water flows out through the three-way valve, and part of it can be used for daily washing; the other part enters the sewage source heat pump and flows out after being heated by the sewage source heat pump; at this time, the heating The final urban water flows out through the three-way valve for domestic bathing, etc.; the other part enters the electric heating device and is heated to boiling water for drinking. In this way, the urban water supply operation process of the system is completed.

The low-level thermal energy utilized by the system is provided by high-temperature sewage. High-temperature domestic boiling water such as bathing enters the sewage storage tank through the sewer pipe, is kept warm and stored in the sewage storage tank, and fully exchanges heat with the multi-branch heat exchanger; the sewage in the sewage storage tank is transported through the sewage side water pump It is transported through the high-temperature sewage water pipe into the sewage source heat pump, and as its heat source, the low-level heat energy is transferred to the urban water supply through the action of the heat pump, and then flows out into the urban sewage pipeline. In this way, the sewage operation process of the system is completed.

When the sewage source heat pump is in operation, the low-temperature refrigerant liquid fully exchanges heat with the sewage in the heat exchanger on the sewage side, and the refrigerant gas absorbs low-level waste heat and then gasifies and enters the compressor; after being compressed by the compressor, the refrigerant gas Compressed into a high-temperature and high-pressure gas, it enters the heat exchanger on the use side; the high-temperature refrigerant gas exchanges heat with the urban water supply, and is cooled itself, and the temperature of the urban water supply rises after absorbing heat; after that, the refrigerant passes through the expansion valve, and the temperature Further down, enter the sewage side heat exchanger. In this way, the internal circulation of the sewage source heat pump is completed.

In the utility model, the outer surfaces of the high-temperature sewage water pipes and urban water supply pipes are all made of thermal insulation materials to reduce unnecessary heat loss during system operation.

The utility model is a sewage source heat pump domestic hot water cascade supply system based on low-level waste heat recovery. The core of the utility model is a multi-branch preheating device and a sewage source heat pump, which can effectively utilize low-level waste heat in sewage. Compared with the existing domestic hot water supply system, it has the following obvious advantages:

(1) Compared with the electric heating hot water supply system, the utility model adds a preheating device and a sewage source heat pump, which makes full use of the low-level waste heat in the sewage, not only achieves the utilization of high-temperature domestic sewage, but also reduces the pollution in the environment. Thermal pollution reduces the operating power consumption of the system, which has obvious energy-saving effect.

(2) Compared with the domestic hot water supply system with single water supply, the utility model is equipped with a multi-step hot water supply device, which can realize the step-by-step supply of domestic hot water on demand, has greater practicability and wider application range, and is especially suitable for For large residences, bathrooms, hotels, etc.

(3) The utility model makes full use of the pressure head of the urban water supply itself and selects the water pump reasonably, further reducing the power consumption of the system operation.

(4) In this utility model, the outer surfaces of high-temperature sewage pipes and urban water supply pipes are made of thermal insulation materials to reduce unnecessary heat loss during system operation.

Description of drawings

Fig. 1 is a schematic diagram of the system mechanism of the utility model.

In the figure: 1- sewage storage tank; 2- preheating device; 21- shunting device; 22- multi-branch heat exchanger; 23- collecting device; 3- use side water pump; 4- sewage side water pump; 1st three-way valve; 6-second three-way valve; 7-city water supply pipe; 8-high temperature sewage water pipe; 9-sewage source heat pump; 91-compressor; 92-sewage side heat exchanger; 93-expansion valve; 94-use side heat exchanger; 10-electric heating device.

Detailed ways

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

The utility model is a sewage source heat pump domestic hot water cascade supply system based on low-level waste heat recovery. Two and three-way valves 6, urban water supply pipes 7, high-temperature sewage water pipes 8, sewage source heat pumps 9, and electric heating devices 10. The preheating device 2 includes a flow splitting device 21 , a collecting device 23 and a multi-branch heat exchanger 22 , and the sewage source heat pump 9 includes a compressor 91 , a sewage side heat exchanger 92 , an expansion valve 93 and a use side heat exchanger 94 .

When the system is in operation, the urban water supply enters the multi-branch heat exchanger 22 through the diversion device 21; The side water pump 3 is transported into the urban water supply pipe 7; at this time, the preheated urban water flows out through the first three-way valve 5 for daily washing, etc.; the other part enters the sewage source heat pump 9, and passes through the sewage source heat pump 9 At this time, the heated urban water flows out through the second three-way valve 6 for daily use such as bathing; the other part then enters the electric heating device 10 and is heated to boiling water for drinking. In this way, the urban water supply operation process of the system is completed.

The low-level thermal energy utilized by the system is provided by high-temperature sewage. High-temperature domestic boiling water such as bathing enters the sewage storage tank 1, is kept warm and stored in the sewage storage tank 1, and fully exchanges heat with the multi-branch heat exchanger 22; the sewage in the sewage storage tank 1 passes through the sewage side water pump 4 transported through the high-temperature sewage water pipe 8 into the sewage source heat pump 9, and as its heat source, the low-level heat energy is transferred to the urban water supply through the action of the heat pump, and then flows out into the urban sewage pipeline. In this way, the sewage operation process of the system is completed.

When the sewage source heat pump 9 is running, the low-temperature refrigerant liquid fully exchanges heat with the sewage in the sewage side heat exchanger 92, and the refrigerant gas absorbs low-level waste heat and then gasifies and enters the compressor 91; after being compressed by the compressor 91 , the refrigerant gas is compressed into a high-temperature and high-pressure gas, and enters the heat exchanger 94 on the use side; the high-temperature refrigerant gas exchanges heat with the urban water supply fully, and is cooled itself, and the temperature of the urban water supply rises after absorbing heat; after that, the refrigerant expands The effect of the valve 93, the temperature is further reduced and enters the heat exchanger 92 on the sewage side. In this way, the internal circulation of the sewage source heat pump 9 is completed.

In one embodiment of the present invention, taking domestic bathing wastewater as an example, it is assumed that the temperature of the wastewater is 45-50°C. Part of the bathing wastewater flows into the sewage reservoir 1 during bathing, where it is stored and kept warm. The sewage is fully exchanged with the urban water supply in the multi-branch heat exchanger 22, and the preheated urban water supply rises from 17°C to about 27°C, and the output through the pipeline can be used for daily washing. Another part of city water enters the follow-up sewage source heat pump 9 for further heating. The heat obtained by the urban water supply is the sum of the heat transferred from the sewage and the input work of the compressor, which effectively reduces the power consumption. The heated city water can reach about 60°C and can be directly used for bathing and so on. Thereafter, the remaining city water enters the electric heating device 10 and is directly heated to boiling water for drinking.

Claims (2)

1. A sewage source heat pump domestic hot water cascade supply system based on low-level waste heat recovery, which is characterized in that the system includes a sewage storage tank (1), a preheating device (2), a sewage source heat pump (9), and a sewage side water pump ( 4), electric heating device (10), use-side water pump (3), first three-way valve (5), second three-way valve (6), high-temperature sewage water pipe (8) and urban water supply pipe (7), all The preheating device (2) includes a flow splitting device (21), a multi-branch heat exchanger (22) and a flow collecting device (23) connected in sequence; the sewage source heat pump (9) includes a compressor (91) connected in sequence ), sewage side heat exchanger (92), expansion valve (93) and use side heat exchanger (94); the preheating device (2) is set in the sewage storage tank (1), and the flow collecting device (23) with the water pump on the use side (3), the first three-way valve (5), the heat exchanger on the use side (94), the city water supply pipe (7), the second three-way valve (6) and the electric heating device (10 ) are connected in sequence; the sewage side heat exchanger (92) is connected to the sewage storage tank (1) through a high temperature sewage water pipe (8) and a sewage side water pump (4). 2. The sewage source heat pump domestic hot water cascade supply system based on low-level waste heat recovery according to claim 1, characterized in that the outer surfaces of the urban water supply pipes (7) and high-temperature sewage pipes (8) are covered with Insulation Materials.

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