Load adjusting method for efficient heat exchanger

Abstract

The invention relates to a load adjusting method of a high-efficiency heat exchanger, the high-efficiency heat exchanger is adopted, the high-efficiency heat exchanger comprises a plurality of heat exchanger modules which are arranged side by side front and back, and the air side and the smoke side of each heat exchanger module are connected through an air duct system and a flue system respectively. The air duct system is provided with an air inlet, two air outlets and a plurality of air duct baffle valves, the flue system is provided with a flue gas inlet, two flue gas outlets and a plurality of flue baffle valves, and according to the load adjusting method, the air duct baffle valves and the flue baffle valves are controlled to enable one or more heat exchanger modules to run in series, in parallel or in series and in parallel. Flue gas and air are controlled to circulate in all the heat exchanger modules through opening and closing of the multiple baffle valves, so that parameters such as the net circulation sectional area, the tube pass number and the heat exchange area in the heat exchanger are changed, and finally the purpose of changing the load of the heat exchanger is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum refining, petrochemical and coal chemical industry, and in particular to a load regulation method for a high-efficiency heat exchanger, which is applied to waste heat recovery systems of heating furnaces in the petroleum refining, petrochemical and coal chemical industries. Background Art

[0002] Heat exchangers are widely used in oil refining, petrochemical and coal chemical industries. Air preheater is a heat exchanger that uses the exhaust heat of heating furnaces and other devices to preheat air. Its function is to reduce the exhaust temperature of heating furnaces and other equipment, improve thermal efficiency, make fuel easy to ignite, burn stably and improve combustion efficiency.

[0003] However, the air preheaters used in the waste heat recovery systems of heating furnaces in the petroleum refining, petrochemical and coal chemical industries at home and abroad are all fixed-load heat exchangers, that is, the net flow cross-sectional area and heat exchange area inside the heat exchanger are fixed. Sometimes the load of the actual operating conditions of the heating furnace is quite different from that of the original design conditions. At this time, it is difficult for such fixed-load heat exchangers to meet the requirements of different working conditions. This phenomenon is the main reason for the frequent transformation of waste heat recovery systems and frequent replacement of air preheaters in the current industry. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a load regulation method for a high-efficiency heat exchanger, which controls the circulation of flue gas and air inside each heat exchanger module by opening and closing a plurality of baffle valves, thereby changing the net flow cross-sectional area, the number of tube passes, the heat exchange area and other parameters inside the heat exchanger, and ultimately achieving the purpose of changing the load of the heat exchanger.

[0005] The object of the present invention is achieved in that: A load regulation method for a high-efficiency heat exchanger adopts a high-efficiency heat exchanger, wherein the high-efficiency heat exchanger comprises a plurality of heat exchanger modules arranged side by side in front and back, the air side and the smoke side of each heat exchanger module are connected through an air duct system and a smoke duct system respectively, the air duct system is provided with an air inlet, two air outlets and a plurality of air duct damper valves, and the smoke duct system is provided with a smoke inlet, two smoke outlets and a plurality of smoke duct damper valves; The load regulation method operates one or more heat exchanger modules in series or parallel or in series and parallel by controlling each air duct damper valve and flue damper valve; Specifically, under the condition of large flow rate of the heating furnace, the heat exchanger modules are put into use in parallel by adjusting the opening and closing of each damper valve on the flue system and the air duct system; Under the condition of low flow rate of the heating furnace, each heat exchanger module is partially put into use by adjusting the opening and closing of each damper valve on the flue system and the air duct system; Under the condition of high thermal efficiency of the heating furnace, each heat exchanger module is put into use in series by adjusting the opening and closing of each damper valve on the flue system and the air duct system.

[0006] Preferably, air branches are provided at both ends of the air side of each heat exchanger module, wherein the air branches on the air inlet side converge at the air inlet, and the air branches on the air outlet side converge at the first air outlet, and duct baffle valves are provided in each air branch and at each air outlet; smoke branches are provided at both ends of the smoke side of each heat exchanger module, wherein the smoke branches on the smoke inlet side converge at the smoke inlet, and the smoke branches on the smoke outlet side converge at the first smoke outlet, and flue baffle valves are provided in each smoke branch and at each smoke outlet; the second air outlet of the air duct system is arranged on the air branch corresponding to the first or last heat exchanger module, and the second smoke outlet of the flue system is arranged on the smoke branch of the first or last heat exchanger module.

[0007] Preferably, it comprises two heat exchanger modules, which are the first heat exchanger module and the second heat exchanger module from front to back, the first air duct damper valve and the second air duct damper valve are correspondingly arranged in the air branch pipes on the air inlet side of the first heat exchanger module and the second heat exchanger module, the third air duct damper valve and the fourth air duct damper valve are correspondingly arranged in the air branch pipes on the air outlet side of the first heat exchanger module and the second heat exchanger module, the air branch pipes on the air inlet side of the first heat exchanger module and the second heat exchanger module merge at the air inlet, the air branch pipes on the air outlet side of the first heat exchanger module and the second heat exchanger module merge at the first air outlet, and the fifth air duct damper valve is arranged at the first air outlet; The first flue damper valve and the second flue damper valve are correspondingly provided in the smoke branch pipes on the smoke inlet sides of the first heat exchanger module and the second heat exchanger module, and the third flue damper valve and the fourth flue damper valve are correspondingly provided in the smoke branch pipes on the smoke outlet sides of the first heat exchanger module and the second heat exchanger module. The smoke branch pipes on the smoke inlet sides of the first heat exchanger module and the second heat exchanger module merge at the smoke inlet, and the smoke branch pipes on the smoke outlet sides of the first heat exchanger module and the second heat exchanger module merge at the first smoke outlet, and the fifth flue damper valve is provided at the first smoke outlet.

[0008] Preferably, the branch pipe where the second air outlet is located is connected to the air branch pipe on the air inlet side of the first heat exchanger module, and the branch pipe where the second air outlet is located is arranged after the first air duct damper valve, and a sixth air duct damper valve is provided at the second air outlet; The branch pipe where the second smoke outlet is located is connected to the smoke branch pipe on the smoke inlet side of the second heat exchanger module, and the branch pipe where the second smoke outlet is located is arranged after the second flue damper valve, and a sixth flue damper valve is arranged at the second smoke outlet.

[0009] Preferably, it includes three heat exchanger modules, which are the second heat exchanger module, the first heat exchanger module and the third heat exchanger module from front to back, the air branch pipes on the air inlet side of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are correspondingly provided with the first air duct damper valve, the second air duct damper valve and the seventh air duct damper valve, the air branch pipes on the air outlet side of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are correspondingly provided with the third air duct damper valve, the fourth air duct damper valve and the eighth air duct damper valve, the air branch pipes on the air inlet side of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are merged at the air inlet, and the air branch pipes on the air outlet side of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are connected at the first air outlet The first air outlet is provided with a fifth air duct damper valve; the first flue damper valve, the second flue damper valve and the seventh flue damper valve are correspondingly arranged in the smoke branch pipes on the smoke inlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module, and the third flue damper valve, the fourth flue damper valve and the eighth flue damper valve are correspondingly arranged in the smoke branch pipes on the smoke outlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module, the smoke branch pipes on the smoke inlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module merge at the smoke inlet, the smoke branch pipes on the smoke outlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module merge at the first smoke outlet, and the fifth flue damper valve is arranged at the first smoke outlet.

[0010] Preferably, the branch pipe where the second air outlet is located is connected to the air branch pipe on the air outlet side of the third heat exchanger module, and the branch pipe where the second air outlet is located is arranged before the eighth air duct damper valve, and a sixth air duct damper valve is provided at the second air outlet; The branch pipe where the second smoke outlet is located is connected to the smoke outlet side smoke branch pipe of the second heat exchanger module, and the branch pipe where the second smoke outlet is located is arranged before the fourth flue damper valve, and a sixth flue damper valve is arranged at the second smoke outlet.

[0011] Preferably, the air branches at the air inlet sides of the first heat exchanger module and the third heat exchanger module are connected through an air bypass pipe, the air bypass pipe is arranged after the first air duct damper valve and the seventh air duct damper valve, and the air bypass pipe is provided with a ninth air duct damper valve; The smoke inlet side smoke branches of the first heat exchanger module and the second heat exchanger module are connected through a smoke bypass pipe, which is arranged after the first smoke duct damper valve and the second air duct damper valve, and a ninth smoke duct damper valve is arranged on the air bypass pipe.

[0012] Preferably, under the condition of high flow rate of the heating furnace, the sixth air duct damper valve and the sixth flue damper valve are closed, the remaining damper valves are all opened, and the first heat exchanger module and the second heat exchanger module are put into use in parallel; Under the condition of low flow rate of the heating furnace, the first air duct damper valve, the third air duct damper valve and the sixth air duct damper valve are closed, and the first flue damper valve, the third flue damper valve and the sixth flue damper valve are closed at the same time, and the remaining damper valves are all opened, so that the first heat exchanger module is stopped and the second heat exchanger module is put into use; Under the high thermal efficiency condition of the heating furnace, the first air duct damper valve and the fifth air duct damper valve are closed, the second flue damper valve and the fifth flue damper valve are closed, and the remaining damper valves are all opened, so that the first heat exchanger module and the second heat exchanger module are put into use in series.

[0013] Preferably, under the condition of large flow rate of the heating furnace, the sixth air duct damper valve and the ninth air duct damper valve are closed, and the sixth flue damper valve and the ninth flue damper valve are closed at the same time, and the remaining damper valves are all opened, so that the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are put into use in parallel; Under the condition of low flow rate of the heating furnace, the second air duct damper valve, the fourth air duct damper valve and the fifth air duct damper valve are opened, and the second flue damper valve, the fourth flue damper valve and the fifth flue damper valve are opened at the same time, and the remaining damper valves are all closed, so that the first heat exchanger module and the third heat exchanger module are stopped, and the second heat exchanger module is put into use; Under the high thermal efficiency operating condition of the heating furnace, close the first air duct damper valve, the fifth air duct damper valve, the seventh air duct damper valve and the eighth air duct damper valve, and at the same time close the first flue damper valve, the second flue damper valve, the fourth flue damper valve and the fifth flue damper valve, and open all the remaining damper valves, so that the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are put into use in series.

[0014] The beneficial effects of the present invention are: 1. Under the condition of large flow of heating furnace, by adjusting the opening and closing of each damper valve on the flue system and the air duct system, each heat exchanger module is put into use in parallel, so that the heat exchanger can meet the requirements of this condition; 2. Under the condition of low flow rate of the heating furnace, by adjusting the opening and closing of each damper valve on the flue system and the air duct system, each heat exchanger module is partially put into use, so that the heat exchanger can meet the requirements of this condition; 3. Under the condition of high thermal efficiency of the heating furnace, by adjusting the opening and closing of each damper valve on the flue system and the air duct system, the heat exchanger modules are put into use in series, so that the heat exchanger can meet the requirements of this working condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of Example 1 of a load regulation method for a high-efficiency heat exchanger of the present invention.

[0016] Figure 2 It is a top view of Example 1 of a load regulation method for a high-efficiency heat exchanger of the present invention.

[0017] Figure 3 It is a left view of Example 1 of a load regulation method for a high-efficiency heat exchanger of the present invention.

[0018] Figure 4 This is a front view of Example 2 of a load regulation method for a high-efficiency heat exchanger of the present invention.

[0019] Figure 5 It is a top view of Example 2 of a load regulation method for a high-efficiency heat exchanger of the present invention.

[0020] Figure 6 It is a left view of Example 2 of a load regulation method for a high-efficiency heat exchanger of the present invention.

[0021] in: A first heat exchanger module 1; a second heat exchanger module 2; an air duct system 3; a first air duct damper valve 4; a second air duct damper valve 5; a third air duct damper valve 6; a fourth air duct damper valve 7; a fifth air duct damper valve 8; a sixth air duct damper valve 9; a flue system 10; a first flue damper valve 11; a second flue damper valve 12; a third flue damper valve 13; a fourth flue damper valve 14; a fifth flue damper valve 15; a sixth flue damper valve 16; a third heat exchanger module 17; a seventh air duct damper valve 18; an eighth air duct damper valve 19; a ninth air duct damper valve 20; a seventh flue damper valve 21; an eighth flue damper valve 22; a ninth flue damper valve 23. DETAILED DESCRIPTION

[0022] See also Figure 1-6 The present invention relates to a high-efficiency heat exchanger, which comprises a plurality of heat exchanger modules arranged side by side, wherein the air side and the smoke side of each heat exchanger module are respectively connected through an air duct system and a smoke duct system, wherein the air duct system is provided with an air inlet, two air outlets and a plurality of air duct damper valves, and the smoke duct system is provided with a smoke inlet, two smoke outlets and a plurality of smoke damper valves, and the air duct damper valves and the smoke damper valves operate one or more heat exchanger modules in series or in parallel or in series and in parallel.

[0023] Air branches are provided at both ends of the air side of each heat exchanger module, wherein the air branches on the air inlet side merge at the air inlet, and the air branches on the air outlet side merge at the first air outlet, and air duct baffle valves are provided in each air branch and at each air outlet.

[0024] Smoke branch pipes are provided at both ends of the smoke side of each heat exchanger module, wherein the smoke branch pipes on the smoke inlet side merge at the smoke inlet, and the smoke branch pipes on the smoke outlet side merge at the first smoke outlet, and flue damper valves are provided in each smoke branch pipe and at each smoke outlet. Example 1

[0025] See also Figure 1-3The present invention relates to a high-efficiency heat exchanger, comprising a first heat exchanger module 1 and a second heat exchanger module 2 arranged side by side, wherein the first heat exchanger module 1 is arranged at the rear side of the second heat exchanger module 2, and the air side and the smoke side of the first heat exchanger module 1 and the second heat exchanger module 2 are connected through an air duct system 3 and a smoke duct system 10 respectively, and the air duct system 3 and the smoke duct system 10 connect the first heat exchanger module 1 and the second heat exchanger module 2 into a complete heat exchanger, the air duct system 3 is provided with an air inlet, two air outlets and 6 air duct damper valves, and the smoke duct system 10 is provided with a smoke inlet, two smoke outlets and 6 smoke damper valves.

[0026] The first air duct damper valve 4 and the second air duct damper valve 5 are correspondingly provided in the air branch pipes on the air inlet side of the first heat exchanger module 1 and the second heat exchanger module 2, and the third air duct damper valve 6 and the fourth air duct damper valve 7 are correspondingly provided in the air branch pipes on the air outlet side of the first heat exchanger module 1 and the second heat exchanger module 2. The air branch pipes on the air inlet side of the first heat exchanger module 1 and the second heat exchanger module 2 converge at the air inlet, and the air branch pipes on the air outlet side of the first heat exchanger module 1 and the second heat exchanger module 2 converge at the first air outlet. The fifth air duct damper valve 8 is provided at the first air outlet, and the branch pipe where the second air outlet is located is connected to the air branch pipe on the air inlet side of the first heat exchanger module 1, and the branch pipe where the second air outlet is located is arranged after the first air duct damper valve 4, and the sixth air duct damper valve 9 is provided at the second air outlet.

[0027] The first flue damper valve 11 and the second flue damper valve 12 are correspondingly provided in the smoke branch pipes on the smoke inlet side of the first heat exchanger module 1 and the second heat exchanger module 2, and the third flue damper valve 13 and the fourth flue damper valve 14 are correspondingly provided in the smoke branch pipes on the smoke outlet side of the first heat exchanger module 1 and the second heat exchanger module 2. The smoke branch pipes on the smoke inlet side of the first heat exchanger module 1 and the second heat exchanger module 2 converge at the smoke inlet, and the smoke branch pipes on the smoke outlet side of the first heat exchanger module 1 and the second heat exchanger module 2 converge at the first smoke outlet. The first smoke outlet is provided with a fifth flue damper valve 15, and the branch pipe where the second smoke outlet is located is connected to the smoke branch pipe on the smoke inlet side of the second heat exchanger module 2, and the branch pipe where the second smoke outlet is located is arranged after the second flue damper valve 12, and the second smoke outlet is provided with a sixth flue damper valve 16.

[0028] Each air duct damper valve and flue damper valve is equipped with a pneumatic actuator, which can remotely operate the opening and closing of each damper valve.

[0029] The variable load method of this high-efficiency heat exchanger is as follows: Under the condition of large flow rate of the heating furnace, the sixth air duct damper valve 9 at the second air outlet and the sixth flue damper valve 16 at the second flue gas outlet are closed, and the remaining damper valves are all opened, so that the first heat exchanger module 1 and the second heat exchanger module 2 are put into use in parallel. In this operation mode, the heat exchanger can obtain the maximum net flow cross-sectional area on the flue gas side and the air side, and can also meet the internal resistance drop requirements of the heat exchanger under the condition of large flow rate of the heating furnace.

[0030] Under the condition of low flow rate of the heating furnace, the first air duct damper valve 4, the third air duct damper valve 6 and the sixth air duct damper valve 9 at the second air outlet are closed, the first flue damper valve 11, the third flue damper valve 13 and the sixth flue damper valve 16 at the second flue gas outlet are closed, and the remaining damper valves are all opened, so that the first heat exchanger module 1 is disabled and the second heat exchanger module 2 is put into use. In this operation mode, the heat exchanger modules are partially put into use, and a high flow rate inside the heat exchanger can be achieved under the condition of low flow rate of the heating furnace, thereby achieving effective heat exchange.

[0031] Under the condition of high thermal efficiency of the heating furnace, the first air duct damper valve 4 and the fifth air duct damper valve 8 at the first air outlet are closed, the second flue damper valve 12 and the fifth flue damper valve 15 at the first flue gas outlet are closed, and the remaining damper valves are all opened, so that the first heat exchanger module 1 and the second heat exchanger module 2 are put into use in series. In this operating mode, the heat exchanger can obtain the maximum flue gas side process length and air side process length, so that the heat exchanger has the highest heat exchange efficiency, thereby enabling the heating furnace to obtain the highest thermal efficiency.

[0032] By changing parameters such as the net flow cross-sectional area, number of tube passes, and heat exchange area inside the heat exchanger, the purpose of changing the heat exchanger load is achieved, so that the heat exchanger can meet the requirements of different working conditions of the heating furnace. Example 2

[0033] See also Figure 4-6 The present invention relates to a high-efficiency heat exchanger, comprising a first heat exchanger module 1, a second heat exchanger module 2 and a third heat exchanger module 17 arranged side by side, the first heat exchanger module 1 is arranged between the second heat exchanger module 2 and the third heat exchanger module 17, and the third heat exchanger module 17 is arranged on the rear side of the first heat exchanger module 1, the air side and the smoke side of the first heat exchanger module 1, the second heat exchanger module 2 and the third heat exchanger module 17 are connected by an air duct system 3 and a smoke duct system 10 respectively, the air duct system 3 and the smoke duct system 10 connect the first heat exchanger module 1, the second heat exchanger module 2 and the third heat exchanger module 17 into a complete heat exchanger, the air duct system 3 is provided with an air inlet, two air outlets and 9 air duct damper valves, and the smoke duct system 10 is provided with a smoke inlet, two smoke outlets and 9 smoke damper valves.

[0034] The first air duct damper valve 4, the second air duct damper valve 5, and the seventh air duct damper valve 18 are correspondingly arranged in the air branch pipes on the air inlet side of the first heat exchanger module 1, the second heat exchanger module 2, and the third heat exchanger module 17. The third air duct damper valve 6, the fourth air duct damper valve 7, and the eighth air duct damper valve 19 are correspondingly arranged in the air branch pipes on the air outlet side of the first heat exchanger module 1, the second heat exchanger module 2, and the third heat exchanger module 17. The air branches on the air inlet side of 7 converge at the air inlet, and the air branches on the air outlet sides of the first heat exchanger module 1, the second heat exchanger module 2 and the third heat exchanger module 17 converge at the first air outlet. A fifth air duct damper valve 8 is provided at the first air outlet. The branch pipe where the second air outlet is located is connected to the air branch pipe on the air outlet side of the third heat exchanger module 17, and the branch pipe where the second air outlet is located is arranged before the eighth air duct damper valve 19. A sixth air duct damper valve 9 is provided at the second air outlet.

[0035] The air branches at the air inlet sides of the first heat exchanger module 1 and the third heat exchanger module 17 are connected via an air bypass pipe, which is arranged behind the first air duct damper valve 4 and the seventh air duct damper valve 18, and a ninth air duct damper valve 20 is provided on the air bypass pipe.

[0036] The first flue damper valve 11, the second flue damper valve 12, and the seventh flue damper valve 21 are correspondingly arranged in the flue gas branch pipes on the flue gas inlet side of the first heat exchanger module 1, the second heat exchanger module 2, and the third heat exchanger module 17. The third flue damper valve 13, the fourth flue damper valve 14, and the eighth flue damper valve 22 are correspondingly arranged in the flue gas branch pipes on the flue gas outlet side of the first heat exchanger module 1, the second heat exchanger module 2, and the third heat exchanger module 17. The smoke branch pipes on the smoke inlet side of 17 converge at the smoke inlet, and the smoke branch pipes on the smoke outlet side of the first heat exchanger module 1, the second heat exchanger module 2 and the third heat exchanger module 17 converge at the first smoke outlet. The first smoke outlet is provided with a fifth flue damper valve 15, and the branch pipe where the second smoke outlet is located is connected to the smoke branch pipe on the smoke outlet side of the second heat exchanger module 2, and the branch pipe where the second smoke outlet is located is arranged before the fourth flue damper valve 14, and the second smoke outlet is provided with a sixth flue damper valve 16.

[0037] The smoke inlet side smoke branches of the first heat exchanger module 1 and the second heat exchanger module 2 are connected through a smoke bypass pipe, which is arranged after the first smoke duct damper valve 11 and the second air duct damper valve 12, and a ninth smoke duct damper valve 23 is arranged on the air bypass pipe.

[0038] Each air duct damper valve and flue damper valve is equipped with a pneumatic actuator, which can remotely operate the opening and closing of each damper valve.

[0039] The variable load method of this high-efficiency heat exchanger is as follows: Under the condition of large flow rate of the heating furnace, the sixth air duct damper valve 9 and the ninth air duct damper valve 20 at the second air outlet are closed, and the sixth flue damper valve 16 and the ninth flue damper valve 23 at the second flue gas outlet are closed at the same time, and the remaining damper valves are all opened, so that the first heat exchanger module 1, the second heat exchanger module 2 and the third heat exchanger module 17 are put into use in parallel. In this operation mode, the heat exchanger can obtain the maximum net flow cross-sectional area on the flue gas side and the air side, and can also meet the internal resistance drop requirements of the heat exchanger under the condition of large flow rate of the heating furnace.

[0040] Under the condition of low flow rate of the heating furnace, the second air duct damper valve 5, the fourth air duct damper valve 7 and the fifth air duct damper valve 8 are opened, and the second flue damper valve 12, the fourth flue damper valve 14 and the fifth flue damper valve 15 are opened at the same time, and the remaining damper valves are all closed, so that the first heat exchanger module 1 and the third heat exchanger module 17 are stopped, and the second heat exchanger module 2 is put into use. In this operation mode, the heat exchanger modules are partially put into use, and a high flow rate inside the heat exchanger can be achieved under the condition of low flow rate of the heating furnace, thereby achieving effective heat exchange.

[0041] Under the high thermal efficiency condition of the heating furnace, the first air duct damper valve 4, the fifth air duct damper valve 8, the seventh air duct damper valve 18 and the eighth air duct damper valve 19 are closed, and the first flue damper valve 11, the second flue damper valve 12, the fourth flue damper valve 14 and the fifth flue damper valve 15 are closed at the same time, and the remaining damper valves are all opened, so that the first heat exchanger module 1, the second heat exchanger module 2 and the third heat exchanger module 17 are put into use in series. In this operating mode, the heat exchanger can obtain the maximum flue gas side process length and the air side process length, so that the heat exchanger has the highest heat exchange efficiency, so that the heating furnace obtains the highest thermal efficiency.

[0042] By changing parameters such as the net flow cross-sectional area, number of tube passes, and heat exchange area inside the heat exchanger, the purpose of changing the heat exchanger load is achieved, so that the heat exchanger can meet the requirements of different working conditions of the heating furnace.

[0043] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A load regulation method for a high-efficiency heat exchanger, characterized in that: A high-efficiency heat exchanger is used, which includes a plurality of heat exchanger modules arranged side by side in front and back, and the air side and the smoke side of each heat exchanger module are connected through an air duct system and a smoke duct system respectively, the air duct system is provided with an air inlet, two air outlets and a plurality of air duct damper valves, and the smoke duct system is provided with a smoke inlet, two smoke outlets and a plurality of smoke duct damper valves; The load regulation method operates one or more heat exchanger modules in series or parallel or in series and parallel by controlling each air duct damper valve and flue damper valve; Specifically, under the condition of large flow rate of the heating furnace, the heat exchanger modules are put into use in parallel by adjusting the opening and closing of each damper valve on the flue system and the air duct system; Under the condition of low flow rate of the heating furnace, each heat exchanger module is partially put into use by adjusting the opening and closing of each damper valve on the flue system and the air duct system; Under the condition of high thermal efficiency of the heating furnace, each heat exchanger module is put into use in series by adjusting the opening and closing of each damper valve on the flue system and the air duct system.

2. A load regulation method for a high-efficiency heat exchanger according to claim 1, characterized in that: Air branches are provided at both ends of the air side of each heat exchanger module, wherein the air branches on the air inlet side converge at the air inlet, and the air branches on the air outlet side converge at the first air outlet, and air duct baffle valves are provided in each air branch and at each air outlet; smoke branches are provided at both ends of the smoke side of each heat exchanger module, wherein the smoke branches on the smoke inlet side converge at the smoke inlet, and the smoke branches on the smoke outlet side converge at the first smoke outlet, and smoke baffle valves are provided in each smoke branch and at each smoke outlet; the second air outlet of the air duct system is arranged on the air branch corresponding to the first or last heat exchanger module, and the second smoke outlet of the smoke duct system is arranged on the smoke branch of the first or last heat exchanger module.

3. A load regulation method for a high-efficiency heat exchanger according to claim 1 or 2, characterized in that: It includes two heat exchanger modules, which are the first heat exchanger module and the second heat exchanger module from front to back. The air branch pipes on the air inlet side of the first heat exchanger module and the second heat exchanger module are correspondingly provided with a first air duct damper valve and a second air duct damper valve. The air branch pipes on the air outlet side of the first heat exchanger module and the second heat exchanger module are correspondingly provided with a third air duct damper valve and a fourth air duct damper valve. The air branch pipes on the air inlet side of the first heat exchanger module and the second heat exchanger module are merged at the air inlet. The air branch pipes on the air outlet side of the first heat exchanger module and the second heat exchanger module are merged at the first air outlet. The first air outlet is provided with a fifth air duct damper valve. The first flue damper valve and the second flue damper valve are correspondingly provided in the smoke branch pipes on the smoke inlet sides of the first heat exchanger module and the second heat exchanger module, and the third flue damper valve and the fourth flue damper valve are correspondingly provided in the smoke branch pipes on the smoke outlet sides of the first heat exchanger module and the second heat exchanger module. The smoke branch pipes on the smoke inlet sides of the first heat exchanger module and the second heat exchanger module merge at the smoke inlet, and the smoke branch pipes on the smoke outlet sides of the first heat exchanger module and the second heat exchanger module merge at the first smoke outlet, and the fifth flue damper valve is provided at the first smoke outlet.

4. The load regulation method for a high-efficiency heat exchanger according to claim 3, characterized in that: The branch pipe where the second air outlet is located is connected to the air branch pipe on the air inlet side of the first heat exchanger module, and the branch pipe where the second air outlet is located is arranged after the first air duct damper valve, and a sixth air duct damper valve is arranged at the second air outlet; The branch pipe where the second smoke outlet is located is connected to the smoke branch pipe on the smoke inlet side of the second heat exchanger module, and the branch pipe where the second smoke outlet is located is arranged after the second flue damper valve, and a sixth flue damper valve is arranged at the second smoke outlet.

5. A load regulation method for a high-efficiency heat exchanger according to claim 1 or 2, characterized in that: It includes three heat exchanger modules, which are the second heat exchanger module, the first heat exchanger module and the third heat exchanger module from front to back. The air branches on the air inlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are correspondingly provided with the first air duct damper valve, the second air duct damper valve and the seventh air duct damper valve. The air branches on the air outlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are correspondingly provided with the third air duct damper valve, the fourth air duct damper valve and the eighth air duct damper valve. The air branches on the air inlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are merged at the air inlet, and the air branches on the air outlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are at the first air outlet. The first air outlet is provided with a fifth air duct damper valve; the first flue damper valve, the second flue damper valve and the seventh flue damper valve are correspondingly arranged in the smoke branch pipes on the smoke inlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module, and the third flue damper valve, the fourth flue damper valve and the eighth flue damper valve are correspondingly arranged in the smoke branch pipes on the smoke outlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module, the smoke branch pipes on the smoke inlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module merge at the smoke inlet, the smoke branch pipes on the smoke outlet sides of the first heat exchanger module, the second heat exchanger module and the third heat exchanger module merge at the first smoke outlet, and the fifth flue damper valve is arranged at the first smoke outlet.

6. A load regulation method for a high-efficiency heat exchanger according to claim 5, characterized in that: The branch pipe where the second air outlet is located is connected to the air branch pipe on the air outlet side of the third heat exchanger module, and the branch pipe where the second air outlet is located is arranged before the eighth air duct damper valve, and the sixth air duct damper valve is arranged at the second air outlet; The branch pipe where the second smoke outlet is located is connected to the smoke outlet side smoke branch pipe of the second heat exchanger module, and the branch pipe where the second smoke outlet is located is arranged before the fourth flue damper valve, and a sixth flue damper valve is arranged at the second smoke outlet.

7. A load regulation method for a high-efficiency heat exchanger according to claim 6, characterized in that: The air branch pipes at the air inlet side of the first heat exchanger module and the third heat exchanger module are connected through an air bypass pipe, the air bypass pipe is arranged after the first air duct damper valve and the seventh air duct damper valve, and the air bypass pipe is provided with a ninth air duct damper valve; The smoke inlet side smoke branches of the first heat exchanger module and the second heat exchanger module are connected through a smoke bypass pipe, which is arranged after the first smoke duct damper valve and the second air duct damper valve, and a ninth smoke duct damper valve is arranged on the air bypass pipe.

8. The load regulation method of a high-efficiency heat exchanger according to claim 3, characterized in that: Under the condition of large flow rate of the heating furnace, the sixth air duct damper valve and the sixth flue damper valve are closed, and the other damper valves are all opened, and the first heat exchanger module and the second heat exchanger module are put into use in parallel; Under the condition of low flow rate of the heating furnace, the first air duct damper valve, the third air duct damper valve and the sixth air duct damper valve are closed, and the first flue damper valve, the third flue damper valve and the sixth flue damper valve are closed at the same time, and the remaining damper valves are all opened, so that the first heat exchanger module is stopped and the second heat exchanger module is put into use; Under the high thermal efficiency condition of the heating furnace, the first air duct damper valve and the fifth air duct damper valve are closed, the second flue damper valve and the fifth flue damper valve are closed, and the remaining damper valves are all opened, so that the first heat exchanger module and the second heat exchanger module are put into use in series.

9. The load regulation method of a high-efficiency heat exchanger according to claim 7, characterized in that: Under the condition of large flow rate of the heating furnace, the sixth air duct damper valve and the ninth air duct damper valve are closed, and the sixth flue damper valve and the ninth flue damper valve are closed at the same time, and the remaining damper valves are all opened, so that the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are put into use in parallel; Under the condition of low flow rate of the heating furnace, the second air duct damper valve, the fourth air duct damper valve and the fifth air duct damper valve are opened, and the second flue damper valve, the fourth flue damper valve and the fifth flue damper valve are opened at the same time, and the remaining damper valves are all closed, so that the first heat exchanger module and the third heat exchanger module are stopped, and the second heat exchanger module is put into use; Under the high thermal efficiency operating condition of the heating furnace, close the first air duct damper valve, the fifth air duct damper valve, the seventh air duct damper valve and the eighth air duct damper valve, and at the same time close the first flue damper valve, the second flue damper valve, the fourth flue damper valve and the fifth flue damper valve, and open all the remaining damper valves, so that the first heat exchanger module, the second heat exchanger module and the third heat exchanger module are put into use in series.

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