CN217541588U

CN217541588U - Sewage source direct-expansion heat exchanger

Info

Publication number: CN217541588U
Application number: CN202220211840.2U
Authority: CN
Inventors: 邢韶缨
Original assignee: Liaoning Jintao New Energy Technology Co ltd; Liaoning Fengzhijia Agricultural Science And Technology Development Co ltd
Current assignee: Liaoning Jintao New Energy Technology Co ltd; Liaoning Fengzhijia Agricultural Science And Technology Development Co ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-10-04
Anticipated expiration: 2032-01-26

Abstract

A sewage source direct expansion heat exchanger belongs to the technical field of air conditioning equipment and comprises a plurality of direct expansion heat exchange units and limiting plates; the heat exchanger is formed by welding the limiting plates at the end parts of the plurality of direct expansion heat exchange units, a flow channel between the adjacent direct expansion heat exchange units in the height direction is a sewage channel, the adjacent direct expansion heat exchange units in the length direction are overlapped through the upper lap joint plate and the lower lap joint plate, a sealing strip is placed in a space formed after the overlapping, and the plurality of direct expansion heat exchange units are arranged in a snake shape in the height direction. Because the direct expansion heat exchange structure does not have the middle two water-water heat exchange processes, the heat exchange efficiency is greatly increased, and the operating cost of the system is reduced.

Description

Sewage source heat exchanger that directly expands

Technical Field

The utility model belongs to the technical field of air conditioning equipment, concretely relates to sewage source heat exchanger that directly expands.

Background

Nowadays, sustainable development has become a hot topic, and environmental factors have attracted attention in various aspects as one of three elements of sustainable development. Sustainable development means maintaining, leveraging and improving the natural resource base, meaning taking environmental concerns and considerations into development plans and policies. The heat pump system is used for recovering the heat energy in the urban sewage, so that a clean energy source is developed, the emission of urban waste heat is reduced, and the environment is protected. The research on the urban sewage heat energy utilization technology is developed, and the research is an application technology research with significance in energy conservation and environmental protection.

The city sewage source heat pump central air conditioning technology is an air conditioning equipment using sewage as heat source to make refrigeration and heating circulation by utilizing the characteristics of large quantity of city sewage, stable water quality and perennial temperature of 13-25 deg.C. The sewage source heat pump has the advantages of stable heat output, high COP value, good heat exchange effect, compact unit structure and the like, and is an effective way for realizing sewage recycling. The sewage source heat pump is more environment-friendly than a coal-fired boiler, the pollutant discharge is reduced by more than 40 percent compared with an air source heat pump, and the pollutant discharge is reduced by more than 70 percent compared with electric heating. It saves energy, saves more than 2/3 of electric energy than the electric boiler, and saves more than 1/2 of fuel than the coal-fired boiler. Because the heat source temperature of the sewage source heat pump is relatively stable all year round, the refrigeration and heating coefficients of the sewage source heat pump are about 40 percent higher than those of the traditional air source heat pump, and the operation cost of the sewage source heat pump is only 50 to 60 percent of that of the common central air conditioner. Therefore, the sewage source heat pump has a wide application prospect, but the use of the sewage source heat pump needs to solve the following problems: the choice of cleaning technology, the choice of system form, the problems of sewage source water temperature, flow rate and the problems of assurance and economy thereof.

1. The existing plate heat exchanger is more traditional in the mode, heat exchange is carried out between sewage and cleaning water by utilizing the plate heat exchanger, and a filtering system needs to be added at the front end of the heat exchanger. Because the sewage flow path in the plate heat exchanger is very narrow, impurities and dirt in the sewage can be precipitated in a short time and block the filtering system and the inner wall of the heat exchanger, so that the heat exchange efficiency is greatly reduced, and system faults are caused.

2. The existing wide-flow-passage way is adopted, and the sewage flow-through pipeline adopts a large-section and single-flow-passage design, so that the defect of blockage of the plate heat exchanger is overcome. Intermediate water (cleaning water) is circulated between the sewage flow pipes and heat exchange is performed between the both, as shown in fig. 1 and 2.

The two forms cover most of the existing sewage heat exchangers, the basic principle is that clean water and sewage are used for heat exchange, then the clean water carries energy to enter an air-conditioning heat pump unit, and refrigeration and heating are carried out in the air-conditioning heat pump unit, as shown in fig. 3. Intermediate water is used in the process of extracting heat from sewage, and primary heat exchange is carried out. The temperature difference between the sewage and the intermediate water is very small, the extracted heat is also very small, and the energy in the sewage cannot be utilized to the maximum extent. After the intermediate water enters the air-conditioning heat pump unit, the intermediate water exchanges heat with a condenser of the unit again, and the efficiency of the whole system is further reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a sewage source direct expansion heat exchanger, compared with the sewage source heat pump in the traditional mode, the direct expansion heat exchanger cancels an intermediate water system, reduces the investment of equipment and saves the land used by a machine room; because the direct expansion heat exchange structure does not have the middle two water-water heat exchange processes, the heat exchange efficiency is greatly increased, and the operating cost of the system is reduced.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a sewage source direct expansion heat exchanger comprises a plurality of direct expansion heat exchange units and limiting plates; the heat exchanger is formed by welding the limiting plates at the end parts of the plurality of direct expansion heat exchange units, a flow channel between the adjacent direct expansion heat exchange units in the height direction is a sewage channel, the adjacent direct expansion heat exchange units in the length direction are overlapped through the upper lap joint plate and the lower lap joint plate, a sealing strip is placed in a space formed after the overlapping, and the plurality of direct expansion heat exchange units are arranged in a snake shape in the height direction.

The direct-expansion heat exchange unit comprises a box body, a liquid separator, copper pipes, supporting nails and a gas collecting pipe, wherein the plurality of copper pipes are arranged in the box body at equal intervals, the two ends of each copper pipe penetrate through the side wall of the box body and extend to the outer side of the box body, the liquid separator is connected with the inlet ends of the plurality of copper pipes through refrigerant copper pipes, the outlets of the plurality of copper pipes are connected to the gas collecting pipe, the supporting nails are arranged between the adjacent copper pipes and used for supporting the top plate and the bottom plate of the box body, gaps are reserved between the top plate and the bottom plate of the box body and the copper pipes, and heat conduction oil is filled in the box body.

The copper pipe is a snake-shaped copper pipe.

The utility model discloses compare in prior art's technological effect do:

1. compared with a sewage source heat pump in a traditional mode, the direct expansion heat exchanger cancels an intermediate water system, reduces the investment of equipment and saves the land for a machine room.

2. Because the direct expansion heat exchange structure does not have the middle twice water-water heat exchange process, the heat exchange efficiency is greatly increased, and the operating cost of the system is reduced.

3. On the cold and hot both sides of water heat transfer, the temperature difference is big more, and heat exchange efficiency is high more. The temperature difference between the inlet and outlet water temperature, the intermediate water temperature and the sewage temperature of the air-conditioning heat pump unit is small, and the heat extraction capacity is correspondingly reduced. By using the direct expansion mode, the evaporation temperature can be set in a lower range, a larger temperature difference can be formed between the evaporation temperature and the sewage, the direct expansion heat exchange efficiency is higher under the condition that the sewage quantity and the heat exchange area are the same, and the equipment investment of the direct expansion heat exchanger is also lower under the same load.

4. The direct expansion heat exchange equipment has relatively low requirement on the environment, does not have electric equipment, and is very flexible in arrangement and site selection of a machine room.

Drawings

FIG. 1 is a schematic view of a prior art wide flow path wastewater heat exchanger;

FIG. 2 is a schematic diagram II of a wide-flow-channel sewage heat exchanger in the prior art;

FIG. 3 is a schematic diagram of a prior art sewage source heat pump system;

FIG. 4 is a schematic view of a sewage source direct expansion heat exchanger assembled by the direct expansion heat exchange unit of the present invention;

FIG. 5 is a top view of the direct expansion heat exchange unit of the present invention;

FIG. 6 is a side view of the direct expansion heat exchange unit of the present invention;

FIG. 7 is a schematic view of a longitudinal lap joint of the direct expansion heat exchange unit of the present invention;

FIG. 8 is a side view of the heating mode of the sewage source direct-expansion heat exchanger of the present invention;

FIG. 9 is a front view of a heating mode of a sewage source direct-expansion heat exchanger of the present invention;

FIG. 10 is a side view of the sewage source direct expansion heat exchanger in the refrigeration mode;

FIG. 11 is a front view of a cooling mode of a sewage source direct expansion heat exchanger of the present invention;

1-direct expansion heat exchange unit, 2-limiting plate, 3-box body, 4-liquid separator, 5-refrigerant copper pipe, 6-copper pipe, 7-supporting nail, 8-heat conducting oil, 9-gas collecting pipe, 10-sewage channel, 11-lap joint plate, 12-sealing strip, 13-refrigerant liquid inlet and outlet, 14-refrigerant gas inlet and outlet, 15-branch pipe, 16-sewage inlet and 17-sewage outlet.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 4 to 7, a sewage source direct expansion heat exchanger includes a plurality of direct expansion heat exchange units 1 and a limiting plate 2; the heat exchanger is formed by welding a plurality of directly-expanded heat exchange units 1 vertically through shell supports welded on the heat exchanger at equal intervals, a heat exchanger is formed by welding limiting plates 2 at the end parts, a flow passage between the adjacent directly-expanded heat exchange units 1 in the height direction is a sewage passage 10, the directly-expanded heat exchange unit 1 at the topmost end and a heat exchanger top plate as well as the directly-expanded heat exchange unit 1 at the bottommost end and a heat exchanger bottom plate form the sewage passage 10, the directly-expanded heat exchange units 1 adjacent in the length direction are overlapped through an upper overlapping plate 11 and a lower overlapping plate 11, a sealing strip 12 is placed in a space formed after overlapping, the plurality of directly-expanded heat exchange units 1 are arranged in a snake shape in the height direction to form the snake-shaped sewage passage 10, sewage flows into the heat exchanger from a sewage inlet 16 of the heat exchanger and flows out through a sewage outlet 17 of the heat exchanger after the snake-shaped flow; the refrigerant liquid inlet and outlet 13 and the refrigerant gas inlet and outlet 14 of the plurality of direct expansion heat exchange units 1 are connected through the branch pipe 15, the sewage source direct expansion heat exchanger adopts a sewage wide flow passage structure, an intermediate water system is omitted, the plurality of direct expansion heat exchange units 1 are combined according to the load size, and sewage flows on the upper side and the lower side of the direct expansion heat exchange units 1 to achieve the purpose of heat exchange.

The direct-expansion heat exchange unit 1 comprises a box body 3, a liquid separator 4, copper pipes 6, supporting nails 7 and a gas collecting pipe 9, wherein the copper pipes 6 are arranged in the box body 3 at equal intervals, two ends of each copper pipe 6 penetrate through the side wall of the box body 3 to extend to the outer side of the box body 3 and are fixedly welded with the side wall of the box body 3, the liquid separator 4 is connected with the inlet ends of the copper pipes 6 through a refrigerant copper pipe 5, outlets of the copper pipes 6 are connected to the gas collecting pipe 9, the supporting nails 7 are arranged between every two adjacent copper pipes 6 and are connected with the top plate and the bottom plate in a welded mode for supporting the top plate and the bottom plate of the box body 3, gaps are reserved between the top plate and the bottom plate of the box body 3 and the copper pipes 6, heat conduction oil is filled in the box body 3 and is 8, and the box body 3 is formed by welding a closed corrosion-resistant carbon steel plate.

The copper pipe 6 is a snake-shaped copper pipe.

The working process of the sewage source direct-expansion heat exchanger comprises the following steps:

as shown in fig. 8 and 9, in the heating mode, the refrigerant liquid uniformly enters a plurality of copper pipes 6 through a liquid separator 4, and is expanded, evaporated and absorbed with heat under the action of sewage flowing in a sewage channel 10, and the cold energy is transferred to the unit box body 3 through heat transfer oil 8, the gas after the refrigerant evaporation is collected by a gas collecting pipe 9 on the other side and is transmitted back to the air conditioning heat pump unit, and the heat pump unit changes the gas into high-temperature and high-pressure gas through the action of a compressor, and then the gas enters a unit condenser to dissipate heat therein, becomes low-temperature and low-pressure liquid, and then returns to the copper pipes 6 in the box body 3 again to be evaporated and absorbed with heat, so that a heating cycle is formed, wherein the heat is absorbed in the sewage and released in the indoor condenser.

As shown in fig. 10 and 11, in the cooling mode, the high-temperature and high-pressure refrigerant gas after the compressor does work enters the copper pipe 6 in the unit module through the gas collecting pipe 9 to dissipate heat, the heat is transmitted to the box body 3 through the heat conducting oil 8, the box body 3 transmits the heat to the sewage flowing in the sewage channel 10, the refrigerant is condensed by releasing the heat and then becomes liquid, the liquid enters the evaporator of the air-conditioning heat pump unit through the liquid separator 4, and is evaporated and absorbed to become low-temperature and low-pressure gas, and then the high-temperature and high-pressure gas is changed by the compressor to do work, so that a refrigeration cycle process that the heat is absorbed from the indoor evaporator end and is dissipated in the sewage is formed.

Claims

1. A sewage source direct expansion heat exchanger is characterized by comprising a plurality of direct expansion heat exchange units and limiting plates; the heat exchanger is formed by welding the limiting plates at the end parts of the plurality of direct expansion heat exchange units, a flow channel between the adjacent direct expansion heat exchange units in the height direction is a sewage channel, the adjacent direct expansion heat exchange units in the length direction are overlapped through the upper lap joint plate and the lower lap joint plate, a sealing strip is placed in a space formed after the overlapping, and the plurality of direct expansion heat exchange units are arranged in a snake shape in the height direction.

2. The sewage source direct expansion heat exchanger of claim 1, wherein: the direct-expansion heat exchange unit comprises a box body, a liquid separator, copper pipes, supporting nails and a gas collecting pipe, wherein the plurality of copper pipes are arranged in the box body at equal intervals, the two ends of each copper pipe penetrate through the side wall of the box body and extend to the outer side of the box body, the liquid separator is connected with the inlet ends of the plurality of copper pipes through refrigerant copper pipes, the outlets of the plurality of copper pipes are connected to the gas collecting pipe, the supporting nails are arranged between the adjacent copper pipes and used for supporting the top plate and the bottom plate of the box body, gaps are reserved between the top plate and the bottom plate of the box body and the copper pipes, and heat conduction oil is filled in the box body.

3. The sewage source direct expansion heat exchanger of claim 2, wherein: the copper pipes are arranged in a snake shape.