CN111623653A - Series PCHE heat exchanger suitable for cylinder arrangement and heat exchange method - Google Patents

Abstract

The invention discloses a series PCHE heat exchanger suitable for cylindrical arrangement and a heat exchange method. The heat exchanger is composed of hollow cylinders, which are connected as a whole by vacuum diffusion welding from front to back and arranged in the hollow cylinder. The front cover plate, several heat medium plates, cold medium plates and back cover are composed. The microchannels on the heat medium plates and the cold medium plates are made by etching. The supercritical CO2 power generation system is the application background, which integrates the functions of the regenerator and the precooler in the supercritical CO2 power generation system, and all external interfaces are arranged on the front cover. space.

Description

A series PCHE heat exchanger suitable for cylindrical arrangement and heat exchange method

technical field

The invention belongs to the technical field of heat exchange devices, and relates to a series PCHE heat exchanger suitable for cylindrical arrangement and a heat exchange method.

Background technique

Printed circuit heat exchanger (PCHE) belongs to the category of microchannel plate heat exchanger. PCHE has the advantages of compact structure, high temperature resistance, high pressure resistance, safety and reliability, etc. It is widely used in refrigeration and air conditioning, oil and gas, nuclear industry, chemical industry, power industry and other fields.

At present, the common PCHE heat exchangers are mostly square, and the inlet and outlet pipes are distributed on 4 different sides of the heat exchanger, so that the inlet and outlet pipes of the heat exchanger are scattered and occupy a large space. In addition, in general, a PCHE heat exchanger only realizes the heat exchanger function of one loop, and multiple independent PCHE heat exchangers are required to achieve multiple heat exchanges in several loops, so that there will be more heat exchanger inlets and outlets. Connect the tubes to take up more space.

In some special applications, such as ships, offshore platforms, etc., due to the narrow space and special requirements for the layout shape, the space utilization rate of the ordinary square independent PCHE heat exchanger is too low, and a specially designed heat exchanger is required to meet special needs.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a compact series PCHE heat exchanger and a heat exchange method suitable for the requirement of a cylindrical arrangement, the heat exchanger is arranged in a cylindrical arrangement as a space arrangement Based on the application background of the supercritical CO2 cycle power generation system, the characteristics of the heat exchanger are that the regenerator and the precooler are combined into one, which is realized by a heat exchanger, and all the external interfaces of the heat exchanger are All are on the front end cover of the heat exchanger, and there are no inlets and outlets on the other sides of the heat exchanger.

For achieving the above object, the technical scheme adopted in the present invention is as follows:

A series PCHE heat exchanger suitable for cylindrical arrangement, the heat exchanger can realize the functions of a regenerator and a precooler in a supercritical CO2 power generation system, and the whole is cylindrical, including vacuum diffusion welding from front to back. The front cover plate A, several heat medium plates B, several cold medium plates C and rear cover plate D are connected as a whole, and the heat medium plates B and the cold medium plates C are etched microchannels on the metal plate The plates, the heat medium plates B and the cold medium plates C are distributed at intervals;

The heat medium plate B and the cold medium plate C are distributed with CO2 hot side inlet 1, CO2 cold side outlet 2, CO2 cold side outlet return port 3, cooling water inlet 4, CO2 hot side outlet return Port 6, CO2 hot side outlet 7, CO2 cold side inlet 8, cooling water outlet return port 9 and cooling water outlet 10; CO2 hot side inlet 1, CO2 cold side outlet return port 3, cooling water inlet 4, CO2 hot side outlet return port 6, CO2 cold side inlet 8 and cooling water outlet return port 9; There are CO2 cold side outlet 2, CO2 cold side outlet return port 3, CO2 hot side outlet return port 6, CO2 hot side outlet 7, cooling water outlet return port 9 and cooling water at the same position of sheet B and cold medium sheet C exit 10;

The heat exchanger has a total of six external interfaces, all of which are arranged on the side of the front cover A. The CO2 hot side inlet 1 on the front cover A is connected to the CO2 hot side inlet pipe outside the heat exchanger, and the CO2 cold side outlet returns. Port 3 is connected to the external CO2 cold side outlet pipe, cooling water inlet 4 is connected to the external cooling water inlet pipe, CO2 hot side outlet return port 6 is connected to the external CO2 hot side outlet pipe, CO2 cold side inlet 8 is connected to the external CO2 cold side The inlet pipe, the cooling water outlet return port 9 is connected to the external cooling water outlet pipe.

Three baffle heads E are welded on the rear cover plate D, and the three baffle heads E are respectively connected to the CO2 hot side outlet 7 and the CO2 hot side outlet return port 6, and are connected to the cooling water outlet 10 and the cooling water outlet return port. 9. Connect the CO2 cold side outlet 2 and the CO2 cold side outlet return port 3.

The front cover plate A, the plurality of heat medium plates B, the plurality of cold medium plates C and the rear cover plate D are all provided with heat insulation and weight reduction holes 5 at the same position along the axial direction.

In the heat exchange method of the series PCHE heat exchanger suitable for cylindrical arrangement, high temperature CO2 flows into the heat exchanger from the CO2 hot side inlet 1 of the front cover plate A, and is dispersed in each heat medium plate B. The sheet B flows along the microchannel, and then collects and flows out from the CO2 hot side outlet 7 of the heat medium sheet B, and flows to the baffle head E of the rear cover plate D, where it is folded to the CO2 hot side in the baffle head E. The outlet return port 6 flows from the back to the front to the outer pipe of the CO2 hot side outlet communicated with the front cover A;

Low-temperature CO2 flows into the heat exchanger from the CO2 cold side inlet 8 of the front cover A, is dispersed in the CO2 channels of each cold medium plate C, flows along the microchannels in the cold medium plate C, and then flows from the cold medium plate C. The CO2 cold side outlet 2 collects and flows out, and flows to the baffle head E of the rear cover plate D, where it is folded to the return port 3 of the CO2 cold side outlet and flows from the back to the front cover plate A. CO2 cold side outlet external pipe;

The cooling water flows into the heat exchanger through the cooling water inlet 4 of the front cover plate A, is dispersed in the microchannels of each cold medium plate C, flows along the microchannels in the cold medium plate C, and then cools slightly from the cold medium plate. The water side outlet 10 collects and flows out, and flows to the baffle head E of the rear cover plate D, where it is folded to the cooling water that flows from the back to the front cover plate A from the return port 9 of the cooling water outlet to the front cover plate A. Outlet external pipe; achieve heat exchange.

The present invention has the following beneficial effects:

(1) Combine the regenerator and the precooler into one: the present invention integrates two heat exchangers, the regenerator and the precooler in a cylindrical heat exchanger, and the CO2 hot side outlet of the regenerator is connected to the precooler. The CO2 side inlet of the cooler is the heat medium plate channel of the heat exchanger, and there is no separate inlet and outlet. Such an arrangement makes the most of the cylindrical space and meets the special needs of the cylindrical space arrangement.

(2) All inlets and outlets of the heat exchanger are collected on the side of the front cover of the heat exchanger, and there are no inlets and outlets on the side of the cylindrical side and the rear cover, so there is no need for pipes to pass around the heat exchanger, which saves space to the greatest extent.

Description of drawings

Figure 1 is a schematic diagram of a supercritical CO2 power generation system.

Among them, 1-1 is the generator, 2-1 is the compressor, 3-1 is the turbine, 4-1 is the regenerator, 5-1 is the pre-cooler, 6-1 is the cooling water outlet pipe, 7- 1 is the CO2 cold side outlet pipe, 8-1 is the CO2 hot side inlet pipe, 9-1 is the CO2 cold side inlet pipe, 10-1 is the CO2 hot side outlet pipe, and 11-1 is the cooling water inlet pipe.

Figure 2 is a schematic diagram of the structure of the heat exchanger plate.

Among them, A is a hollow cylinder, B is a front cover, C is a heat medium plate, D is a cold medium plate, and E is a rear cover.

FIG. 3 is a schematic diagram of the passage and inlet and outlet of the cold medium plate.

FIG. 4 is a schematic diagram of a heat medium plate channel. FIG. 5 is a schematic diagram of the rear cover plate and the baffle head.

FIG. 6 is a schematic diagram of the nozzle of the front cover plate.

FIG. 7 is a schematic diagram of the nozzle of the rear cover plate.

Among them, 1 is the CO2 hot side inlet, 2 is the CO2 cold side outlet, 3 is the CO2 cold side outlet return port, 4 is the cooling water inlet, 5 is the heat insulation weight reduction hole, 6 is the CO2 hot side outlet return port, and 7 is the return port of the CO2 hot side outlet. The CO2 hot side outlet, 8 is the CO2 cold side inlet, 9 is the cooling water outlet return port, and 10 is the cooling water outlet.

Detailed ways

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

As shown in the schematic diagram 1 of the supercritical CO2 system, the heat exchanger of the present invention can realize the functions of the regenerator 4-1 and the precooler 5-1 in the supercritical CO2 power generation system. In this system, the CO2 on the hot side of the regenerator 4-1 comes from the exhaust gas of the turbine 3-1. After the heat is released from the regenerator 4-1 and the precooler 5-1, it is discharged from the hot side of the precooler and enters the compressor 2 -1, CO2 from the outlet of compressor 2-1 enters the inlet of the cold side of the regenerator 4-1, and is discharged from the outlet of the cold side after absorbing heat.

As shown in Figure 2, a series PCHE heat exchanger suitable for cylindrical arrangement of the present invention is cylindrical as a whole, and includes a front cover plate A and a number of heat medium plates B that are connected as a whole by vacuum diffusion welding from front to back. , a number of cold medium plates C and rear cover plates D, the thermal medium plates B and the cold medium plates C are plates with microchannels etched on the metal plate, the thermal medium plates B and the cold medium plates Slice C spaced distribution.

As shown in Fig. 3 and Fig. 4 , the same positions of the heat medium plate B and the cold medium plate C are distributed with CO2 hot side inlet 1, CO2 cold side outlet 2, CO2 cold side outlet return port 3, cooling Water inlet 4, CO2 hot side outlet return port 6, CO2 hot side outlet 7, CO2 cold side inlet 8, cooling water outlet return port 9 and cooling water outlet 10.

As shown in Figure 6, there are CO2 hot side inlet 1, CO2 cold side outlet return port 3, cooling water inlet 4, CO2 heat Side outlet return port 6, CO2 cold side inlet 8 and cooling water outlet return port 9.

As shown in Figure 7, there are CO2 cold side outlet 2, CO2 cold side outlet return port 3, and CO2 hot side outlet return port 6 on the same position as the heat medium sheet B and the cold medium sheet C on the rear cover D , CO2 hot side outlet 7, cooling water outlet return port 9 and cooling water outlet 10.

The heat exchanger has a total of six external interfaces, as shown in Figure 2 and Figure 6, all of which are arranged on the side of the front cover A, and the CO2 hot side inlet 1 on the front cover A is connected to the CO2 heat outside the heat exchanger. Side inlet pipe, CO2 cold side outlet return port 3 is connected to the external CO2 cold side outlet pipe, cooling water inlet 4 is connected to the external cooling water inlet pipe, CO2 hot side outlet return port 6 is connected to the external CO2 hot side outlet pipe, CO2 cooling The side inlet 8 is connected to the external CO2 cold side inlet pipe, and the cooling water outlet return port 9 is connected to the external cooling water outlet pipe.

As shown in FIG. 5 and FIG. 7 , as a preferred embodiment of the present invention, three baffle heads E are welded on the rear cover plate D, and the three baffle heads E are respectively connected to the CO2 hot side outlet 7 and the CO2 heat The side outlet return port 6 communicates with the cooling water outlet 10 and the cooling water outlet return port 9, and communicates with the CO2 cold side outlet 2 and the CO2 cold side outlet return port 3.

As a preferred embodiment of the present invention, the front cover plate A, several heat medium plates B, several cold medium plates C and rear cover plate D are provided with heat insulation and weight reduction holes 5 at the same position along the axial direction.

As shown in Fig. 2, in a heat exchange method of a series PCHE heat exchanger suitable for a cylindrical arrangement according to the present invention, high temperature CO2 flows into the heat exchanger from the CO2 hot side inlet 1 of the front cover plate A, and is dispersed in each heat exchanger. The medium plate B flows along the microchannel in the heat medium plate B, and then collects and flows out from the CO2 hot side outlet 7 of the heat medium plate B, and flows to the baffle head E of the rear cover D, where the baffle seal The head E is folded to the CO2 hot side outlet return port 6 and flows from back to front to the outer pipe of the CO2 hot side outlet connected to the front cover A; low-temperature CO2 flows into the heat exchanger from the CO2 cold side inlet 8 of the front cover A, The CO2 channels dispersed in each cold medium plate C flow along the micro-channels in the cold medium plate C, and then collect and flow out from the CO2 cold side outlet 2 of the cold medium plate C, and flow to the baffle seal of the rear cover plate D. Head E, folded in the baffle head E to the return port 3 of the CO2 cold side outlet and flow from back to front to the outer pipe of the CO2 cold side outlet connected to the front cover A; 4 flows into the heat exchanger, disperses in the microchannels of each cold medium plate C, flows along the microchannel in the cold medium plate C, and then collects and flows out from the cooling water side outlet 10 of the cold medium plate micro, and flows to the back cover The baffle head E of the plate D is folded in the baffle head E to flow from the cooling water outlet return port 9 to the outer pipe of the cooling water outlet communicated from the back to the front cover A to realize heat exchange.

The above detailed description is only a preferred embodiment of the present invention. If the supply direction of the external pipes of the heat exchanger changes, for example, the cooling water inlet and outlet are behind the heat exchanger, it is only necessary to adjust the position of the head on the front and rear cover plates, and the connecting pipe. The location is sufficient, and the scope of the present invention is not limited by this. That is, all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the patent of the present invention.

Claims (4)

1. a series PCHE heat exchanger that is suitable for cylindrical arrangement, is characterized in that, described heat exchanger can realize supercritical CO The function of regenerator and precooler in power generation system is cylindrical as a whole, including from front to The front cover plate (A), a number of thermal medium plates (B), a number of cold medium plates (C) and a rear cover plate (D) are connected in sequence by vacuum diffusion welding. The thermal medium plate (B) ) and the cold medium plate (C) are both plates with microchannels etched on the metal plate, and the thermal medium plate (B) and the cold medium plate (C) are spaced apart; The CO2 hot side inlet (1), the CO2 cold side outlet (2), the CO2 cold side outlet return port (3), Cooling water inlet (4), CO2 hot side outlet return port (6), CO2 hot side outlet (7), CO2 cold side inlet (8), cooling water outlet return port (9) and cooling water outlet (10); There are CO2 hot side inlet (1), CO2 cold side outlet return port (3), cooling water inlet ( 4), CO2 hot side outlet return port (6), CO2 cold side inlet (8) and cooling water outlet return port (9); on the rear cover plate (D) with the heat medium plate (B) and the cold medium plate At the same position of sheet (C), there are CO2 cold side outlet (2), CO2 cold side outlet return port (3), CO2 hot side outlet return port (6), CO2 hot side outlet (7), cooling water outlet return port (9) and cooling water outlet (10); The heat exchanger has a total of six external interfaces, all of which are arranged on the side of the front cover (A), and the CO2 hot side inlet (1) on the front cover (A) is connected to the CO2 hot side inlet pipe outside the heat exchanger. , the CO2 cold side outlet return port (3) is connected to the external CO2 cold side outlet pipe, the cooling water inlet (4) is connected to the external cooling water inlet pipe, and the CO2 hot side outlet return port (6) is connected to the external CO2 hot side outlet pipe , the CO2 cold side inlet (8) is connected to the external CO2 cold side inlet pipe, and the cooling water outlet return port (9) is connected to the external cooling water outlet pipe. 2. The series PCHE heat exchanger suitable for cylindrical arrangement according to claim 1, is characterized in that, three baffle seal heads (E) are welded on the back cover plate (D), and three baffle seals are welded on the back cover plate (D). The head (E) is respectively connected to the CO2 hot side outlet (7) and the CO2 hot side outlet return port (6), the cooling water outlet (10) and the cooling water outlet return port (9), and is connected to the CO2 cold side outlet (2) and CO2 cold side outlet return port (3). 3. A series PCHE heat exchanger suitable for cylindrical arrangement according to claim 1, characterized in that, the front cover plate (A), a plurality of heat medium plates (B), a plurality of cold medium plates (C) ) and the rear cover plate (D) are provided with heat-insulating weight-reducing holes (5) at the same position along the axial direction. 4. The heat exchange method of a series of PCHE heat exchangers suitable for cylindrical arrangement according to any one of claims 1 to 3, characterized in that, high temperature CO It flows into the heat exchanger, disperses in each heat medium plate (B), flows along the microchannel in the heat medium plate (B), and then collects and flows out from the CO2 hot side outlet (7) of the heat medium plate (B), Flow to the baffle head (E) of the rear cover (D), in the baffle head (E), it is folded to the return port (6) from the outlet of the CO2 hot side and flows from the back to the front cover (A) Connected CO2 hot side outlet external pipeline; The low-temperature CO2 flows into the heat exchanger from the CO2 cold side inlet (8) of the front cover plate (A), is dispersed in the CO2 channels of each cold medium plate (C), and flows along the microchannels in the cold medium plate (C), Then, it collects and flows out from the CO2 cold side outlet (2) of the cold medium plate (C), and flows to the baffle head (E) of the rear cover plate (D), where it is folded in the baffle head (E) from the CO2 The cold side outlet return port (3) flows from the back to the front cover plate (A) to the outer pipe of the CO2 cold side outlet; The cooling water flows into the heat exchanger from the cooling water inlet (4) of the front cover plate (A), is dispersed in the microchannels of each cold medium plate (C), flows along the microchannels in the cold medium plate (C), and then flows into the heat exchanger. Collects and flows out from the cooling water side outlet (10) of the cold medium plate, flows to the baffle head (E) of the rear cover plate (D), and folds back from the cooling water outlet in the baffle head (E) The port (9) flows from the rear to the front to the outer pipe of the cooling water outlet which is communicated with the front cover plate (A); heat exchange is realized.

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