CN203595166U - Heat exchange unit - Google Patents

Abstract

A heat exchange unit relates to a heat exchange machine. Generally, heat exchange units are assembled at the installation site, and professional operators need to monitor the equipment at all times during operation, which is costly, water-intensive, and after assembly occupies a large area and is complicated to control. The utility model comprises a heat exchange device and a control device for controlling the work of the heat exchange device, and is characterized in that: the heat exchange device is arranged on a base, and the heat exchange device includes a shell-and-tube heat exchanger, a plate heat exchange device, temperature control valve, circulation pump, water supply pump, valve, thermometer, pressure gauge, temperature sensor, pressure sensor, the temperature sensor is set at the outlet of the secondary side, which feeds back the temperature signal to the control device, and the control device controls the temperature control valve action. The heat exchange device of this technical solution is set on a base without on-site assembly. The combination of plate heat exchanger and shell-and-tube heat exchanger reduces the cost, and can generate two kinds of hot water at different temperatures to meet different needs. .

Description

A heat exchange unit

technical field

The utility model relates to a heat exchanger.

Background technique

With the development of the national economy, in the field of heating and heating, due to the increasingly high requirements for energy conservation and environmental protection, central heating has become the mainstream in systems such as community heating, domestic water, and hot water for enterprise production processes. The traditional heat exchange units for central heating mainly use steam or high-temperature hot water as the heat medium, and generally use a shell-and-tube heat exchanger (if the primary heat medium is steam and the temperature is high, a plate heat exchanger is used to install it) The desuperheater reduces the temperature of the primary heat medium to less than 150 ℃), a circulation pump, a water supply pump, valves, instruments, electric control cabinets and accessories.

Existing problems and shortcomings: These devices are generally assembled at the installation site, and professional operators need to monitor the equipment from time to time when the equipment is running. If the plate heat exchanger is used to increase the temperature and decompression device, the investment will be increased, and a part of high-temperature condensed water will be wasted. In addition, these devices occupy a large area and are complex to control after assembly.

Utility model content

The technical problem to be solved and the technical task proposed by the utility model are to perfect and improve the existing technical solutions, and to provide a heat exchange unit to reduce floor space and facilitate installation. For this reason, the utility model takes the following technical solutions.

A heat exchange unit, including a heat exchange device and a control device for controlling the operation of the heat exchange device, characterized in that: the heat exchange device is arranged on a base, and the heat exchange device includes a shell-and-tube heat exchanger, Plate heat exchanger, temperature control valve, circulation pump, make-up water pump, valves, thermometer, pressure gauge, temperature sensor, pressure sensor, the heat medium on the primary side enters the shell-and-tube heat exchanger through the temperature control valve for the first heat exchange, After releasing a part of the heat, it enters the plate heat exchanger for secondary heat exchange, and then discharges the heat again; the secondary side low-temperature water enters the shell-and-tube heat exchanger or plate heat exchanger through the circulating pump and sends it out after being heated. The sensor is installed at the outlet of the secondary side, which feeds back the temperature signal to the control device, and the control device controls the action of the temperature control valve to adjust the flow of heat medium to control the outlet water temperature of the secondary side. The heat exchange device is set on a base, avoiding on-site assembly, and there is no need for professional operators to monitor the equipment from time to time during operation. The combination of the plate heat exchanger and the shell-and-tube heat exchanger replaces the plate heat exchanger plus the temperature reduction and pressure reduction device, which reduces the cost and can generate hot water at two different temperatures to meet different needs.

As a further improvement and supplement to the above technical solution, the utility model also includes the following additional technical features.

The shell-and-tube heat exchanger is located on the upper layer of the device, the plate heat exchanger is located on the left front side of the base, the control device is located on the right rear side of the base, and the middle part of the base is equipped with a circulation pump and a water supply pump ; The circulation pump and water replenishment pump are located in the lower layer of the device; the front and rear sides of the middle layer of the device are respectively provided with a first confluence pipe and a second confluence pipe. The control device is far away from the heat exchanger to avoid transferring the heat of the heat exchanger to the control device to ensure the reliability of the device; the confluence pipe is used to connect the circulation pump and the water supply pump to reduce the complexity of the pipeline and facilitate maintenance. The valve can be set On the upper and lower sides of the manifold for easy operation and control.

Both the shell-and-tube heat exchanger and the plate heat exchanger are provided with a heat release tube on the primary side and a heat-absorbing tube on the secondary side, and the heat-absorbing tube on the secondary side of the shell-and-tube heat exchanger and the plate heat exchanger There are valves at both the inlet and outlet ends of the shell-and-tube heat exchanger. The outlet valve outlet of the heat absorbing pipe on the secondary side of the shell-and-tube heat exchanger is connected with the outlet valve of the heat absorbing pipe on the secondary side of the plate heat exchanger through pipelines to form a second branch. The first branch and the second branch can realize hot water of two different temperatures to meet different demands.                       

The heat exchange device is provided with a secondary side circulation system and a water supply system. The secondary side circulation system includes a circulation filter, a first circulation pump, and a first check valve. The outlet of the circulation filter is connected to the first manifold through a valve. The inlet of the first circulation pump communicates with the first confluence pipe through a valve, and the outlet of the first check valve communicates with the second confluence pipe through a valve; The connected first filter, the first cut-off valve, the first supplementary water pump, the second check valve, and the second cut-off valve, the outlet of the second cut-off valve communicates with the first confluence pipe.

The water replenishment system also includes a second water replenishment branch, and the second water replenishment branch includes a second filter, a third shut-off valve, a second replenishment water pump, a third check valve, and a fourth shut-off valve connected in sequence through pipelines, The outlet end of the fourth cut-off valve communicates with the first confluence pipe.

The secondary side circulation system also includes a first circulation bypass, the first circulation bypass includes a second circulation pump and a fourth check valve connected in sequence through pipelines, and the inlet of the second circulation pump communicates with the first manifold through a valve; The outlet of the fourth check valve communicates with the second confluence pipe through the valve. Under the premise of meeting the requirements of users, the first circulation bypass minimizes the loss of water flow resistance on the secondary side, so that it is equipped with a circulation pump with less power consumption to save power.

The secondary side circulation system also includes a fifth check valve, the inlet of the fifth check valve communicates with the first confluence pipe, and the outlet communicates with the second confluence pipe; the inlet and outlet of the temperature control valve are provided with valves.

The first confluence pipe is provided with a pressure gauge and a thermometer, and the second confluence pipe is provided with a safety valve and a pressure gauge.

The first supplementary water pump, the second supplementary water pump, the first circulation pump and the second circulation pump are water pumps controlled by a frequency converter, and the input terminal of the frequency converter is connected with the output terminal of the control device.

The outlet of the secondary side of the device is provided with a pressure gauge, a thermometer, a pressure sensor and a temperature sensor, and the output terminals of the pressure sensor and the temperature sensor are connected to the input terminal of the control device; the heat release outlet of the primary side of the plate heat exchanger is provided with a There is a trap, the inlet and outlet of the trap are equipped with valves, the inlet of the inlet valve of the trap is connected with the outlet of the outlet valve of the trap through another valve, and the outlet of the primary side of the device is equipped with a pressure gauge and a thermometer. The setting of the valve facilitates the debugging and maintenance of the device.

Beneficial effect:

1. The combination structure of shell-and-tube heat exchanger and plate heat exchanger is adopted. When the primary heat medium temperature is high, it is unnecessary to install complicated temperature and pressure reduction devices to ensure the operation of a single plate heat exchanger. Compared with Compared with using shell-and-tube heat exchanger or plate heat exchanger alone, the heat transfer efficiency is significantly improved;

2. The shell-and-tube heat exchanger, plate heat exchanger, temperature control valve, circulation pump, make-up water pump, valves, instruments, electric control cabinets and various pipelines are tightly combined into an organic whole, which is equivalent to a A complete "heat exchange station". It greatly facilitates the user's on-site use, saves on-site assembly and assembly, and the user only needs to connect the inlet and outlet of the primary heat medium with the inlet and outlet of the secondary side hot water.

3. The heat exchange unit is controlled by PLC automatic control system, and the indoor temperature is automatically controlled according to the outdoor temperature change. Both the circulation pump and the supplementary water pump adopt frequency conversion control. The supplementary water pump receives the pressure signal from the pressure sensor, automatically starts and stops, and automatically maintains the system pressure. Effectively save the heat medium energy.

4. A unique bypass pipeline on the secondary side is designed to minimize the loss of water flow resistance on the secondary side on the premise of meeting the user's requirements, so that it is equipped with a circulating pump with less power consumption to save power. the

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural principle diagram of the utility model.

In the figure: 1- base; 2- shell and tube heat exchanger; 3- plate heat exchanger; 4- temperature control valve; 5- the first circulation pump; 6- the second circulation pump; 7- the first water supply pump; 8-second replenishment pump; 9-thermometer; 10-pressure gauge; 11-temperature sensor; 12-pressure sensor; 13-first manifold; 14-second manifold; 15-first check valve; 16- The second check valve; 17-the third check valve; 18-the fourth check valve; 19-the fifth check valve; 20-the first stop valve; 21-the second stop valve; 22-the third stop valve ; 23-the fourth shut-off valve; 24-circulation filter; 25-the first filter; 26-the second filter; 27-steam trap; 28-safety valve;

Detailed ways

The technical solution of the utility model is described in further detail below in conjunction with the accompanying drawings of the description.

As shown in Figures 1 and 2, the utility model includes a heat exchange device and a control device 29 for controlling the work of the heat exchange device. The heat exchange device is arranged on a base 1, and the heat exchange device includes a shell-and-tube Heater 2, plate heat exchanger 3, temperature control valve 4, circulation pump, water supply pump, valve, thermometer 9, pressure gauge 10, temperature sensor 11, pressure sensor 12, primary side heat medium enters the shell through temperature control valve 4 Type heat exchanger 2 conducts heat exchange for the first time, releases part of the heat and then enters plate heat exchanger 3 for secondary heat exchange, releases heat again and then discharges; secondary side low-temperature water enters the shell-and-tube heat exchanger through the circulating pump 2 or the plate heat exchanger 3 is heated and sent out. The temperature sensor 11 is set at the outlet of the secondary side, which feeds back the temperature signal to the control device 29, and the control device 29 controls the action of the temperature control valve 4 to adjust the flow rate of the heat medium to control Secondary side outlet water temperature. The shell-and-tube heat exchanger 2 is located on the upper layer of the device, the plate heat exchanger 3 is located on the left front side of the base 1, the control device 29 is located on the right rear side of the base 1, and the middle part of the base 1 is provided with a circulation Pumps and supplementary water pumps; the circulation pump and supplementary water pump are located in the lower layer of the device; the front and rear sides of the middle layer of the device are respectively provided with a first confluence pipe 13 and a second confluence pipe 14. Both the shell-and-tube heat exchanger 2 and the plate heat exchanger 3 are provided with a primary side heat release pipe and a secondary side heat absorption pipe, and the secondary side of the shell-and-tube heat exchanger 2 and the plate heat exchanger 3 Both the inlet end and the outlet end of the side heat absorbing pipe are equipped with valves, and the shell and tube heat exchanger 2 secondary side heat absorbing pipe inlet valve inlet and the plate heat exchanger 3 secondary side heat absorbing pipe inlet valve inlet and the second confluence The tubes 14 are connected to form a first branch, and the outlet valve outlet of the heat absorbing pipe on the secondary side of the shell and tube heat exchanger 2 is connected to the outlet valve of the heat absorbing pipe on the secondary side of the plate heat exchanger 3 through pipes to form a second branch. The heat exchange device is equipped with a secondary side circulation system and a water supply system. The secondary side circulation system includes a circulation filter 24, a first circulation pump 5, and a first check valve 15. The outlet of the circulation filter 24 is connected to the first valve through the valve. The confluence pipe 13 communicates, the inlet of the first circulation pump 5 communicates with the first confluence pipe 13 through a valve, and the outlet of the first check valve 15 communicates with the second confluence pipe 14 through a valve; the water supply system includes a first water supply branch, and the The first supplementary water branch comprises a first filter 25, a first shut-off valve 20, a first supplementary water pump 7, a second check valve 16, and a second shut-off valve 21 connected in sequence by pipelines, and the outlet of the second shut-off valve 21 is connected to the The first manifolds 13 communicate with each other.

In order to improve the reliability of the system work, the water supply system also includes a second water supply branch, and the second water supply branch includes a second filter 26, a third shut-off valve 22, a second water supply pump 8, The third check valve 17 , the fourth stop valve 23 , and the outlet end of the fourth stop valve 23 communicates with the first manifold 13 . The added second water supply branch can be used as a backup to improve the reliability of work.

In order to further improve the reliability of the system work and facilitate maintenance, the secondary side circulation system also includes a first circulation bypass and a fifth check valve 19, and the secondary side circulation system also includes a first circulation bypass, a first circulation bypass It includes the second circulation pump 6 and the fourth check valve 18 connected in sequence through pipelines, the inlet of the second circulation pump 6 communicates with the first confluence pipe 13 through the valve; the outlet of the fourth check valve 18 communicates with the second confluence pipe through the valve Tube 14 communicates. The inlet of the fifth check valve 19 communicates with the first confluence pipe 13 , and the outlet communicates with the second confluence pipe 14 ; the inlet and outlet of the temperature control valve 4 are provided with valves.

In order to facilitate intuitive monitoring and improve the safety of the device, the first manifold 13 is provided with a pressure gauge 10 and a thermometer 9 , and the second manifold 14 is provided with a safety valve 28 and a pressure gauge 10 .

In order to facilitate the control accuracy and save primary heat medium energy, the first supplementary water pump 7, the second supplementary water pump 8, the first circulation pump 5, and the second circulation pump 6 are water pumps controlled by frequency converters, and the input terminals of the frequency converters are connected to the control The output of device 29 is connected. The outlet of the secondary side of the device is provided with a pressure gauge 10, a thermometer 9, a pressure sensor 12, and a temperature sensor 11, and the output ends of the pressure sensor 12 and the temperature sensor 11 are connected to the input end of the control device 29; The heat release outlet of the primary side of the device 3 is provided with a trap 27, and the inlet and outlet of the trap 27 are provided with valves. The inlet of the inlet valve of the trap 27 and the outlet of the outlet valve of the trap 27 are connected through another valve. The outlet is provided with a pressure gauge 10 and a thermometer 9.

A heat exchange unit shown in above Figures 1 and 2 is a specific embodiment of the utility model, which has already reflected the substantive features and progress of the utility model, and can be used according to actual needs under the inspiration of the utility model. The equivalent modification of its shape, structure and other aspects are all within the scope of protection of this scheme.

Claims (10)

1. a heat exchange unit, comprise the control device (29) of heat-exchanger rig and the work of control heat-exchanger rig, it is characterized in that: described heat-exchanger rig is located on a base (1), described heat-exchanger rig comprises shell-and-tube heat exchanger (2), plate type heat exchanger (3), temperature-sensing valve (4), circulating pump, small pump, valve, thermometer (9), pressure gauge (10), temperature sensor (11), pressure sensor (12), primary side heating agent enters shell-and-tube heat exchanger (2) through temperature-sensing valve (4) and carries out heat exchange for the first time, emit and enter again plate type heat exchanger (3) after a part of heat and carry out secondary heat exchange, after again emitting heat, discharge, secondary side water at low temperature is sent after circulating pump enters shell-and-tube heat exchanger (2) or plate type heat exchanger (3) heating, described temperature sensor (11) is located at secondary side outlet, temperature signal is fed back to control device (29) by it, and temperature-sensing valve (4) controlled by control device (29) thereby action is to regulate flow rate of heat medium to control secondary side leaving water temperature.

2. a kind of heat exchange unit according to claim 1, it is characterized in that: described shell-and-tube heat exchanger (2) is positioned at the upper strata of device, described plate type heat exchanger (3) is located at the front left side of base (1), described control device (29) is located at the right lateral side of base (1), and circulating pump, small pump are established in the middle part of base (1); Described circulating pump, the lower floor that small pump is positioned at device; The both sides, front and back in device middle level are respectively equipped with the first collecting pipe (13), the second collecting pipe (14).

3. a kind of heat exchange unit according to claim 1 and 2, it is characterized in that: described shell-and-tube heat exchanger (2), plate type heat exchanger (3) is equipped with primary side heat release pipe and secondary side endothermic tube, described shell-and-tube heat exchanger (2), entrance point and the port of export of the secondary side endothermic tube of plate type heat exchanger (3) are equipped with valve, the import of shell-and-tube heat exchanger (2) secondary side endothermic tube imported valve communicates with the second collecting pipe (14) and forms the first branch road with the import of plate type heat exchanger (3) secondary side endothermic tube imported valve, the outlet of shell-and-tube heat exchanger (2) secondary side endothermic tube outlet valve is connected to form the second branch road with the outlet of plate type heat exchanger (3) secondary side endothermic tube outlet valve by pipeline.

4. a kind of heat exchange unit according to claim 3, it is characterized in that: heat-exchanger rig is established the secondary side circulatory system, water charging system, the described secondary side circulatory system comprises recursive filter (24), the first circulating pump (5), the first check-valves (15), recursive filter (24) outlet communicates with the first collecting pipe (13) by valve, the first circulating pump (5) import communicates with the first collecting pipe (13) by valve, and the first check-valves (15) outlet communicates with the second collecting pipe (14) by valve; Water charging system comprises the first moisturizing branch road, the first described moisturizing branch road comprises the first filter (25), the first stop valve (20), the first small pump (7), the second check-valves (16), the second stop valve (21) that connect successively by pipeline, and the outlet of the second stop valve (21) communicates with the first collecting pipe (13).

5. a kind of heat exchange unit according to claim 4, it is characterized in that: water charging system also comprises the second moisturizing branch road, the second described moisturizing branch road comprises the second filter (26), the 3rd stop valve (22), the second small pump (8), the 3rd check-valves (17), the 4th stop valve (23) that connect successively by pipeline, and the port of export of the 4th stop valve (23) communicates with the first collecting pipe (13).

6. a kind of heat exchange unit according to claim 5, it is characterized in that: the secondary side circulatory system also comprises the first circulation bypass, the first circulation bypass comprises the second circulating pump (6), the 4th check-valves (18) that connect successively by pipeline, and the import of the second circulating pump (6) communicates with the first collecting pipe (13) by valve; The outlet of the 4th check-valves (18) communicates with the second collecting pipe (14) by valve.

7. a kind of heat exchange unit according to claim 6, is characterized in that: the secondary side circulatory system also comprises the 5th check-valves (19), and the import of the 5th check-valves (19) communicates with the first collecting pipe (13), and outlet communicates with the second collecting pipe (14); The import and export of described temperature-sensing valve (4) are equipped with valve.

8. a kind of heat exchange unit according to claim 7, is characterized in that: the first collecting pipe (13) is provided with pressure gauge (10) and thermometer (9), and the second collecting pipe (14) is provided with safety valve (28), pressure gauge (10).

9. a kind of heat exchange unit according to claim 8, it is characterized in that: the first small pump (7), the second small pump (8), the first circulating pump (5), the second circulating pump (6) are the water pump by Frequency Converter Control, and the input of frequency converter is connected with the output of control device (29).

10. a kind of heat exchange unit according to claim 1, it is characterized in that: the outlet of device secondary side is provided with pressure gauge (10), thermometer (9), pressure sensor (12), temperature sensor (11), and described pressure sensor (12), the output of temperature sensor (11) are connected with the input of control device (29); Described plate type heat exchanger (3) primary side heat release outlet is provided with drain valve (27), the import and export of drain valve (27) are equipped with valve, between the outlet of the import of drain valve (27) imported valve and drain valve (27) outlet valve, communicate by another valve, the outlet of device primary side is provided with pressure gauge (10) and thermometer (9).

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