Modularized large matrix type plate-type air preheater

Abstract

The utility model discloses a modularized large matrix type plate-type air preheater which comprises a heat exchange module, the heat exchange module comprises a profile steel frame and plate-type heat exchange units stacked in the profile steel frame in a matrix mode, and the plate-type heat exchange units conduct heat exchange through a plurality of sets of heat exchange plates. A hot side inlet and a hot side outlet are formed in the two ends, in the width direction, of the heat exchange module correspondingly, and the hot side inlet and the hot side outlet are connected with the heat exchange module through a hot side shell; a cold side inlet and a cold side outlet are symmetrically formed in one end of the heat exchange module in the length direction left and right, and the other end of the heat exchange module is also provided with a cold side shell; reasonable modular design and matrix stacking type design of modules are carried out, the problems that under the working condition of the heat exchange area of tens of thousands of square meters, the size of raw materials of a single plate-type air preheater exceeds the limit, and the single plate-type air preheater cannot be purchased are solved, the production and manufacturing difficulty is lowered, and the transportation and field installation cost of equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of DC contactors, in particular to a modular large-scale matrix plate-type air preheater. Background Art

[0002] With the large-scale development of domestic petrochemical and power plant industry equipment, the waste heat utilization brought about by it has also increased exponentially, and large-scale plate air preheaters are urgently needed for waste heat utilization. At present, the traditional plate air preheaters have the following main problems: (1) Due to the size of the raw materials, a single plate air preheater cannot be increased indefinitely, that is, a single plate air preheater cannot reach a heat exchange area of ​​tens of thousands of square meters; (2) If the size of a single plate air preheater is too large, its production and manufacturing difficulty increases, and the cost of equipment transportation and on-site installation also increases significantly.

[0003] The utility model creatively proposes a modular large-scale matrix plate air preheater. Through reasonable modular structural design, the large heat exchange area plate air preheater that exceeds the size limit and cannot be manufactured is broken down into several modules, and then the overall structural design is carried out, which solves the problem of excessive size of the raw materials used and reduces the manufacturing difficulty, transportation cost and installation cost. Utility Model Content

[0004] The purpose of the utility model is to provide a modular large-scale matrix plate air preheater to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A modular large-scale matrix plate air preheater comprises a heat exchange module, wherein the heat exchange module comprises a steel frame and a plate heat exchange unit stacked in a matrix in the steel frame, wherein the plate heat exchange unit performs heat exchange through an array of heat exchange plates; a hot side inlet and a hot side outlet are respectively arranged at both ends of the heat exchange module in the width direction, wherein the hot side inlet and the hot side outlet are connected to the heat exchange module through a hot side shell, and the hot side shell is directly connected to a heat exchange flow channel of the array of plate heat exchange units;

[0007] The heat exchange module is symmetrically provided with a cold side inlet round square and a cold side outlet round square at one end along the length direction, and a cold side shell is also symmetrically provided with the other end along the length direction; a bypass pipe is provided between the cold side inlet round square and the cold side outlet round square, and a flow linkage regulating device and a circular expansion joint are provided on the bypass pipe;

[0008] The cold side shell is provided with a manhole, a flow guide device is provided inside, and a vertical ladder for internal monitoring and maintenance is provided below the flow guide device; a rectangular expansion joint is provided between the cold side shell, the cold side inlet top and bottom, the cold side outlet top and bottom and the heat exchange module;

[0009] An upper platform for inspection and maintenance is provided in front of the center of the distance between the cold side inlet top and the cold side outlet top, a front platform for inspection and maintenance is provided below the bypass pipe, and a back platform for monitoring and maintenance is provided behind the cold side shell.

[0010] Preferably, a hot side inlet pressure gauge and a hot side inlet thermometer are provided on the hot side inlet.

[0011] Preferably, a hot side outlet pressure gauge and a hot side outlet temperature are provided on the hot side outlet.

[0012] Preferably, an annular base is provided at the bottom of the heat exchange module.

[0013] Preferably, a cold side inlet pressure gauge and a cold side inlet thermometer are provided next to the cold side inlet top and bottom.

[0014] Preferably, a cold side outlet pressure gauge and a cold side outlet thermometer are provided on the cold side outlet top and bottom surface.

[0015] The working principle of the utility model is:

[0016] The high-temperature flue gas discharged by the boiler enters the hot side flow channel of the modular large-scale matrix plate air preheater, and the cold air enters the cold side flow channel of the modular large-scale matrix plate air preheater. In the heat exchange module, the cold medium and the hot medium exchange heat, that is, the waste flue gas discharged by the boiler heats the cold air to achieve the purpose of waste heat recovery. This waste heat recovery mainly involves the following three parts:

[0017] 1) Matrix heat exchange module part

[0018] Heat exchange occurs in the matrix heat exchange module. The arrangement and number of heat exchange modules in the utility model are arranged in 4 rows in the horizontal direction and 5 columns in the vertical direction (a total of 20 heat exchange modules) according to specific working conditions and reasonable heat transfer calculations. At the same time, the short side end face of the heat exchange module matrix is ​​connected to the cold side medium (cold air), and the long side end face is connected to the hot side medium (waste flue gas discharged by the boiler). The characteristics of this arrangement are: on the hot side, the incoming hot side medium is taken up to the maximum extent and the matching connection with the original equipment on the hot side medium end can be guaranteed; on the cold side, a flow design is carried out (the cold side is divided into 4 flows in the utility model), and the cold side flow channel is extended, which can make more efficient use of waste heat. The structural characteristics of the matrix heat exchange module: in the horizontal direction, a certain space is left between the 4 rows of heat exchange modules according to the thermal expansion analysis calculation and the characteristics of on-site assembly, and non-metallic and metal composite fastening connection devices are set between the heat exchange modules. This design makes the heat exchange modules relatively independent (avoiding the heat exchange modules from squeezing each other due to thermal expansion under operating conditions, affecting the normal operation of the utility model), and has a certain degree of connectivity (avoiding the normal vibration under operating conditions causing the single heat exchange module to vibrate excessively). In the vertical direction, a special convex structure is designed on the top of each heat exchange module, and a special concave structure is designed on the bottom. The upper heat exchange module and the lower heat exchange module are positioned and connected by the convex and concave structures to ensure smooth assembly on site and stability during operation. The above reasonable design ensures the smooth operation of the matrix heat exchange module.

[0019] 2) Hot side shell part

[0020] The hot side shell adopts a "funnel-shaped" structural design. The large end of the funnel is easy to match and connect with the existing equipment on site, and the small end size is the same as the long side end face of the matrix heat exchange module. This design ensures that the utility model matches and connects with the existing equipment on site, so that the waste heat can be utilized. At the same time, a flow guide device is set inside the hot side shell to ensure that the medium entering the shell is more evenly distributed.

[0021] 3) Cold side shell part

[0022] The cold side shell is mainly composed of the cold side inlet round square, the cold side outlet round square, and the bypass pipe. The cold side inlet round square and the cold side outlet round square are designed with a round mouth at one end and a square mouth at the other end. The round mouth end can be matched and connected with the external pipeline, and the square mouth end can be matched and connected with the short side end face of the matrix heat exchange module. In addition, the cold side inlet round square is designed with a flow guide device and a reinforcing rib structure, which improves the shell strength while ensuring uniform distribution of the medium. The bypass pipe is set to meet different heat exchange requirements under winter and summer conditions. In winter, the flow linkage regulating device on the bypass pipe is used to reduce the flow of cold side medium, ensuring that the temperature at the hot side outlet is higher than the dew point temperature to avoid dew point corrosion; in summer, the flow linkage regulating device on the bypass pipe is used to increase the flow of cold side medium, which can maximize the use of waste heat from exhaust gas.

[0023] The beneficial effects of the utility model are:

[0024] (1) The utility model adopts reasonable modular design and matrix stacking design of modules, which solves the problem that the raw materials required for a single plate air preheater are out of size and cannot be purchased under the condition of a heat exchange area of ​​tens of thousands of square meters. At the same time, compared with the overall large equipment, the single module in the modular design is small in size and light in weight, which reduces the difficulty of production and manufacturing, and greatly reduces the transportation and on-site installation costs of the equipment.

[0025] (2) The utility model adopts a special bypass structure design and is provided with a flow linkage adjustment device on the bypass structure. The flow linkage adjustment is used to adapt to the summer and winter working conditions of the equipment.

[0026] (3) In the utility model, rectangular expansion joints are provided at the connection points of the cold side inlet, the cold side outlet, the cold side shell and the heat exchange module to solve the problem of thermal expansion during the operation of the equipment.

[0027] (4) A monitoring and maintenance platform is provided around the manhole and bypass structure of the intercooler side shell of the utility model, so that corresponding monitoring and recording can be carried out when the equipment is operating normally.

[0028] (5) In the present invention, both the hot side inlet and the cold side inlet are provided with pressure gauges and thermometers, which can monitor the operating status of the equipment in real time.

[0029] (6) A flow guide device is provided inside the intercooler shell of the utility model to ensure a more uniform distribution of the medium and improve the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the front view of the utility model;

[0031] Figure 2 It is a top view of the utility model;

[0032] Figure 3 It is a left view of the utility model;

[0033] Figure 4 This is a schematic diagram of the module structure of the utility model;

[0034] Figure 5 This is a schematic diagram of the structure of the flow guide device of the utility model;

[0035] Figure 6 This is a schematic diagram of the structure of the vertical ladder for internal monitoring and maintenance of the utility model;

[0036] Figure 7 This is a schematic diagram of the structure of the front platform for monitoring and maintenance of the utility model;

[0037] Figure 8 This is a schematic diagram of the structure of the back platform for monitoring and maintenance of the utility model;

[0038] Fig. 9 This is a schematic diagram of the structure of the upper platform for monitoring and maintenance of the utility model;

[0039] Among them: 1-heat exchange module, 101-steel frame, 102-plate heat exchange unit, 2-hot side shell, 3-hot side outlet thermometer, 4-hot side outlet pressure gauge, 5-hot side inlet pressure gauge, 6-hot side inlet thermometer, 7-ring base, 8-rectangular expansion joint, 9-cold side shell, 10-back platform for monitoring and maintenance, 11-manhole, 12-flow guide device, 13-vertical ladder for internal monitoring and maintenance, 14-cold side outlet round square, 15-cold side outlet pressure gauge, 16-cold side outlet thermometer, 17-circular expansion joint, 18-bypass pipe, 19-flow linkage regulating device, 20-cold side inlet thermometer, 21-cold side inlet pressure gauge, 22-cold side inlet round square, 23-upper platform for monitoring and maintenance, 24-front platform for monitoring and maintenance. DETAILED DESCRIPTION

[0040] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0041] like Figure 1-9A modular large-scale matrix plate air preheater is shown, comprising a heat exchange module 1, wherein the heat exchange module 1 comprises a steel frame 101 and plate heat exchange units 102 stacked in a matrix in the steel frame 101, and an annular base 7 is provided at the bottom of the heat exchange module 1; the plate heat exchange unit 102 performs heat exchange through an array of heat exchange plates; the heat exchange module 1 is provided with a hot side inlet 25 and a hot side outlet 26 at both ends along the width direction, respectively, and the hot side inlet 25 and the hot side outlet 26 are connected to the heat exchange module 1 through a hot side shell 2, and the hot side shell 2 is directly connected to the heat exchange flow channel of the array of plate heat exchange units 102; the heat exchange module 1 is symmetrically provided with a cold side inlet top round square 22 and a cold side outlet top round square 14 at one end along the length direction, and the heat exchange module A cold side shell 9 is also symmetrically arranged on the left and right at the other end of the block 1 along the length direction; a bypass pipe 18 is arranged between the cold side inlet round bottom surface 22 and the cold side outlet round bottom surface 14, and a flow linkage regulating device 19 and a circular expansion joint 17 are arranged on the bypass pipe 18; a manhole 11 is arranged on the cold side shell 9, a flow guide device 12 is arranged inside, and a vertical ladder 13 for internal monitoring and maintenance is arranged below the flow guide device 12; a rectangular expansion joint 8 is arranged between the cold side shell 9, the cold side inlet round bottom surface 22 and the cold side outlet round bottom surface 14 and the heat exchange module 1; an upper platform 23 for detection and maintenance is arranged on the front side of the center of the distance between the cold side inlet round bottom surface 22 and the cold side outlet round bottom surface 14, a front platform 24 for detection and maintenance is arranged below the bypass pipe 18, and a back platform 10 for monitoring and maintenance is arranged behind the cold side shell 9.

[0042] A hot side inlet pressure gauge 5 and a hot side inlet thermometer 6 are provided on the hot side inlet 25 , and a hot side outlet pressure gauge 4 and a hot side outlet thermometer 3 are provided on the hot side outlet 26 .

[0043] A cold side inlet pressure gauge 21 and a cold side inlet thermometer 20 are arranged beside the cold side inlet top and bottom surface 22; a cold side outlet pressure gauge 15 and a cold side outlet thermometer 16 are arranged on the cold side outlet top and bottom surface 14.

[0044] The working process of the utility model is:

[0045] The high-temperature flue gas discharged by the boiler enters the hot side flow channel of the modular large-scale matrix plate air preheater, and the cold air enters the cold side flow channel of the modular large-scale matrix plate air preheater. In the heat exchange module 1, the cold medium and the hot medium exchange heat, that is, the waste flue gas discharged by the boiler heats the cold air to achieve the purpose of waste heat recovery. This waste heat recovery mainly involves the following three parts:

[0046] 1) Matrix heat exchange module part

[0047] Heat exchange occurs in the matrix heat exchange module. The arrangement and number of the heat exchange modules 1 in the utility model are arranged in 4 rows in the horizontal direction and 5 columns in the vertical direction (a total of 20 heat exchange modules 1) according to the specific working conditions and reasonable heat transfer calculations. At the same time, the short side end faces of the heat exchange module 1 matrix are connected to the cold side medium (cold air), and the long side end faces are connected to the hot side medium (waste flue gas discharged by the boiler). The characteristics of this arrangement are: on the hot side, the incoming hot side medium is taken up to the maximum extent and the matching connection with the original equipment on the hot side medium end can be guaranteed; on the cold side, a flow design is carried out (the cold side is divided into 4 flows in the utility model), and the cold side flow channel is extended, which can make more efficient use of waste heat. The structural characteristics of the matrix heat exchange module: in the horizontal direction, a certain space is left between the 4 rows of heat exchange modules 1 according to the thermal expansion analysis calculation and the characteristics of on-site assembly, and non-metallic and metal composite fastening connection devices are set between the heat exchange modules 1. This design makes the heat exchange modules 1 relatively independent (avoiding the heat exchange modules 1 from squeezing each other due to thermal expansion under operating conditions, affecting the normal operation of the utility model), and has a certain degree of connectivity (avoiding the normal vibration under operating conditions causing the single heat exchange module 1 to vibrate and shift excessively). In the vertical direction, a special convex structure is designed on the top of each heat exchange module 1, and a special concave structure is designed on the bottom. The upper heat exchange module 1 is positioned and connected with the lower heat exchange module 1 through the convex and concave structures to ensure smooth assembly on site and stability during operation. The above reasonable design ensures the smooth operation of the matrix heat exchange module.

[0048] 2) Hot side shell part

[0049] The hot side shell 2 adopts a "funnel-shaped" structural design. The large end of the funnel is easy to match and connect with the existing equipment on site, and the small end size is the same as the long side end face of the matrix heat exchange module. This design ensures that the utility model matches and connects with the existing equipment on site, so that the waste heat can be utilized. At the same time, a flow guide device is set inside the hot side shell to ensure that the medium entering the shell is more evenly distributed.

[0050] 3) Cold side shell part

[0051] The cold side shell 9 is mainly composed of the cold side inlet round square 22, the cold side outlet round square 14, and the bypass pipe 18. The cold side inlet round square 22 and the cold side outlet round square 14 are both designed with a round mouth at one end and a square mouth at the other end. The round mouth end can be matched and connected with the external pipeline, and the square mouth end can be matched and connected with the short side end face of the matrix heat exchange module. In addition, a flow guide device and a reinforcing rib structure are designed inside the cold side inlet round square 22, which improves the shell strength while ensuring uniform distribution of the medium. The bypass pipe 18 is set to cope with different heat exchange requirements under winter and summer conditions. In winter, the flow linkage regulating device 19 on the bypass pipe 18 is used to reduce the flow of the cold side medium, ensuring that the temperature at the hot side outlet is higher than the dew point temperature to avoid dew point corrosion; in summer, the flow linkage regulating device 19 on the bypass pipe 18 is used to increase the flow of the cold side medium, so as to maximize the use of the waste heat of the exhaust gas.

[0052] The utility model solves the problem that the raw materials required for a single plate-type air preheater are out of size and cannot be purchased under the condition of tens of thousands of square meters of heat exchange area through reasonable modular design and matrix stacking design of modules. The modules here are arranged in a matrix of 5 layers and 4 columns. The length, width and height of a single module are about 6m×2m×3m. The length direction of the module is the cold side flow channel, and the width direction is the hot side flow channel. The outside of the module is a steel frame structure, and the inside is a heat exchange element (the cold side plates and the hot side plates are arranged alternately for heat exchange). At the same time, compared with the overall large-scale equipment, the single module in the modular design is small in size and light in weight, which reduces the difficulty of production and manufacturing, and greatly reduces the transportation and on-site installation costs of the equipment. For the summer and winter working conditions of the equipment, a special bypass structure design is adopted between the cold side inlet and the cold side outlet, and a flow linkage regulating device is set on the bypass structure. Through the information connection between the flow linkage regulating device and the main control room, the cold side inlet flow is increased accordingly in summer, and the cold side inlet flow is reduced accordingly in winter. Due to the large temperature difference between the inlet and outlet of the cold side of the equipment, rectangular expansion joints are set at the connection between the cold side inlet, the cold side outlet, the cold side shell and the heat exchange module to solve the thermal expansion problem during the operation of the equipment and ensure the safe operation of the equipment. A monitoring and maintenance platform is set at the manhole of the cold side shell. When the equipment is in the shutdown and maintenance period, the equipment can be entered through the manhole for maintenance. Pressure gauges and thermometers are set at the inlet and outlet of the cold side. At the same time, monitoring and maintenance platforms are set around the pressure gauges, thermometers and bypass structures. When the equipment is operating normally, pressure and temperature can be monitored and recorded to grasp the operating status of the equipment in real time. In addition, a flow guide device is set inside the cold side shell to ensure a more uniform distribution of the medium and improve the heat exchange efficiency. A monitoring and maintenance ladder is also set inside the cold side shell. When the equipment is in the shutdown and maintenance period, the monitoring and maintenance ladder can be used to check whether the flow channel in each module is fouled and other abnormal conditions, so as to carry out timely maintenance.

[0053] The utility model is based on the module design and arranges the modules in a matrix. The cold and hot side shells are arranged on the sides of the matrix respectively, and the medium exchanges heat through the cold and hot side flow channels. Then, a monitoring and maintenance platform, a base, a bypass structure, etc. are arranged on the periphery to complete the overall structural design. The utility model has a compact structure and a scientific and reasonable design.

[0054] The above are only preferred examples of the present invention. It should be pointed out that for ordinary technicians in this field, under the technical inspiration provided by the present invention, as common knowledge in the electrical field, other equivalent variations and improvements can be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A modular large-scale matrix plate air preheater, characterized in that: The heat exchange module (1) comprises a steel frame (101) and plate heat exchange units (102) stacked in a matrix arrangement in the steel frame (101), wherein the plate heat exchange units (102) perform heat exchange via arrays of heat exchange plates; a hot side inlet (25) and a hot side outlet (26) are respectively provided at both ends of the heat exchange module (1) in the width direction; the hot side inlet (25) and the hot side outlet (26) are connected to the heat exchange module (1) via a hot side shell (2); and the hot side shell (2) is directly connected to the heat exchange flow channel of the array of plate heat exchange units (102); A cold side inlet round square (22) and a cold side outlet round square (14) are symmetrically arranged on the left and right at one end of the heat exchange module (1) along the length direction, and a cold side shell (9) is also symmetrically arranged on the left and right at the other end of the heat exchange module (1) along the length direction; a bypass pipe (18) is arranged between the cold side inlet round square (22) and the cold side outlet round square (14), and a flow linkage regulating device (19) and a circular expansion joint (17) are arranged on the bypass pipe (18); The cold side shell (9) is provided with a manhole (11), a flow guide device (12) is provided inside, and a vertical ladder (13) for internal monitoring and maintenance is provided below the flow guide device (12); a rectangular expansion joint (8) is provided between the cold side shell (9), the cold side inlet top and bottom surfaces (22), the cold side outlet top and bottom surfaces (14), and the heat exchange module (1); An upper platform (23) for detection and maintenance is provided at the front side of the center of the distance between the cold side inlet top and bottom (22) and the cold side outlet top and bottom (14), a front platform (24) for detection and maintenance is provided below the bypass pipe (18), and a rear platform (10) for monitoring and maintenance is provided at the rear of the cold side shell (9).

2. A modular large-scale matrix plate air preheater according to claim 1, characterized in that: The hot side inlet (25) is provided with a hot side inlet pressure gauge (5) and a hot side inlet thermometer (6).

3. A modular large-scale matrix plate air preheater according to claim 1 or 2, characterized in that: The hot side outlet (26) is provided with a hot side outlet pressure gauge (4) and a hot side outlet thermometer (3).

4. A modular large-scale matrix plate air preheater according to claim 3, characterized in that: The bottom of the heat exchange module (1) is provided with an annular base (7).

5. A modular large-scale matrix plate air preheater according to claim 4, characterized in that: A cold side inlet pressure gauge (21) and a cold side inlet thermometer (20) are provided next to the cold side inlet top and bottom pipe (22).

6. A modular large-scale matrix plate air preheater according to claim 5, characterized in that: A cold side outlet pressure gauge (15) and a cold side outlet thermometer (16) are provided on the cold side outlet top and bottom surface (14).

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