Novel air preheater for refining industry

Abstract

The utility model relates to a novel air preheater for the refining industry, which belongs to the technical field of air preheating and comprises a second air preheater, a high-temperature smoke inlet pipe, a low-temperature smoke outlet pipe and a hot air conveying pipe. A low-temperature section air outlet of the second air preheater is connected with a centrifugal exhaust fan, an outlet of the centrifugal exhaust fan is connected with a bridging pipeline, a side outlet of the bridging pipeline is connected with a high-temperature section air inlet of the second air preheater, a top outlet of the bridging pipeline is connected with a bypass pipe, and the bypass pipe is connected with a hot air conveying pipe. The manufacturing cost and the occupied area are reduced. The air flow uniformity of a low-temperature section is ensured, the heat exchange efficiency is greatly improved, a dead zone is avoided, the over-low exhaust gas temperature is avoided, the temperature of bypass air is improved, the temperature of air entering a combustion furnace is ensured, the fuel amount is reduced, and the energy-saving efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air preheating technical field especially relates to a new air preheater for refining industry. BACKGROUND

[0002] International energy resources are nervous, and greenhouse effect aggravates, and energy saving and efficiency increasing, carbon emission reduction are imminent. At present, air preheater is widely applied in petroleum refining, steel, electric power and each industry, and the refining industry proposes 95+ energy efficiency, and the air preheater is challenged.

[0003] The connecting structure of the air preheater of the existing refining industry is as shown in Figure 1 Including air inlet chimney pipeline 01, centrifugal blower 02, air inlet 09, bypass air duct 03, air preheater one 08, cross air duct 06, hot air outlet pipe 04, flue gas inlet pipe 05 and flue gas outlet pipe 07, and the waste heat recovery process of the refining industry is: air inlet chimney pipeline 01-centrifugal blower 02-air inlet 09-air preheater one 08, and the air preheater one 08 is located at the air outlet side of the centrifugal blower 02, the uniformity of the air outlet is poor and is easily affected by the structure, increases the heat exchange dead zone and reduces the heat exchange efficiency, and there are problems of large occupied area, high manufacturing cost, long process pipeline, high resistance drop, high energy consumption and the like; in the winter operation process of the current refining industry, in order to prevent the white smoke generated by the low exhaust gas temperature and the condensation of acid liquid, intensify the corrosion of flue and chimney, part of air will not pass through the air preheater one 08 through the bypass air duct 03, reduce the cold air volume flowing through the air preheater one 08, increase the exhaust gas temperature, but lead to the decrease of the air temperature entering the combustion furnace, the increase of fuel quantity and the increase of energy consumption. UTILITY MODEL CONTENTS

[0004] The utility model mainly solves the technical problem in the above background art, and provides a new air preheater for refining industry.

[0005] In order to realize the above purpose, the utility model adopts the following technical scheme a new air preheater for refining industry, the flue gas inlet and the flue gas outlet of air preheater two are connected with high-temperature flue gas inlet pipe and low-temperature flue gas outlet pipe respectively, the hot air conveying pipe is connected to the high-temperature section air outlet of air preheater two, the air preheater two low-temperature section air inlet is connected with the air inlet air volume adjusting grid, the centrifugal air extractor is connected to the air preheater two low-temperature section air outlet, the cross connecting pipeline is connected to the outlet of centrifugal air extractor, the cross connecting pipeline side outlet is connected with the high-temperature section air inlet of air preheater two, the bypass air pipe is connected to the top outlet of cross connecting pipeline, the bypass air pipe is connected with hot air conveying pipe, and the bypass baffle valve is arranged on the bypass air pipe.

[0006] As a preferred, the air inlet of the cross pipe is directly below the top outlet, which can better utilize the bypass air pipe to increase the exhaust gas temperature in winter, and the air inlet of the cross pipe is connected with the air outlet of the centrifugal fan through a soft connection flange. By using the soft connection flange, the transmission of vibration is avoided, the noise is reduced, and the disassembly and maintenance are easy, avoiding the inconvenience of disassembly and maintenance of the fan caused by integration.

[0007] As a preferred, the inlet of the centrifugal fan is connected with a suction hood, and the other end of the suction hood is connected with the air outlet of the low-temperature section of the air preheater II, facilitating the connection of the centrifugal fan.

[0008] As a preferred, the air inlet volume regulating grid comprises an air inlet frame matched with the air inlet of the low-temperature section of the air preheater II, and the air inlet frame is provided with an air volume regulating assembly, and the air volume regulating assembly comprises a plurality of grid plates capable of regulating the air inlet volume by rotating, and the grid plates are connected with driving devices for driving the rotation of the grid plates, and the air volume adjusting valve such as a gate valve, which is sensitive to adjustment and more accurate in adjustment.

[0009] As a preferred, the driving device comprises a connecting plate fixedly connected to the middle part of each grid plate, and a plurality of connecting plates are hingedly connected with a same driving plate, one end of the driving plate is hingedly connected with a connecting plate, and the other end of the connecting plate is hingedly connected with a rotating handle, and the rotating handle is rotatably installed on the air inlet frame, so that the rotation of the grid plate and the adjustment of the air inlet volume can be conveniently controlled.

[0010] As a preferred, the rotating handle is hingedly connected with an electric telescopic rod away from one end of the connecting plate, the electric telescopic rod is connected with a controller, a temperature sensor one is arranged in the hot air conveying pipe, a temperature sensor two is arranged in the air inlet frame, a temperature sensor three is arranged in the low-temperature smoke outlet pipe, a temperature sensor four is arranged in the cross pipe, and a temperature sensor five is arranged in the high-temperature smoke inlet pipe, and the controller is connected with the temperature sensor one, the temperature sensor two, the temperature sensor three, the temperature sensor four, the temperature sensor five, the electric telescopic rod, the centrifugal fan and the bypass baffle valve, so that the adjustment can be automatically adjusted, the automation is higher, and the control precision is higher.

[0011] As a preferred, the middle part of the air inlet frame is fixedly connected with a partition frame plate for separating the air inlet frame into upper and lower air inlet regions, and the upper and lower air inlet regions are both provided with air volume regulating assemblies.

[0012] The utility model has the following beneficial effects:

[0013] The length of the air duct is reduced, the air resistance and the air leakage area are reduced, the manufacturing cost and the floor area are reduced, the centrifugal fan is located at the rear part of the low-temperature section of the air preheater II, the air flow uniformity of the low-temperature section is ensured, the heat exchange efficiency is greatly improved, the dead zone is avoided, the bypass air pipe is located at the rear part of the centrifugal fan, the air volume of the air preheater high-temperature module is adjusted, the exhaust gas temperature is prevented from being too low, the temperature of the bypass air is improved, the air temperature entering the combustion furnace is ensured, the amount of fuel is reduced, and the energy-saving efficiency is improved. Attached Figure Description

[0014] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0015] The structures, proportions, sizes, etc. disclosed in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0016] Figure 1 This is a schematic diagram of the connection structure of an existing air preheater;

[0017] Figure 2 This is a schematic diagram of the structure of this utility model;

[0018] Figure 3 A three-dimensional structural diagram of the air intake volume adjustment grille;

[0019] Legend: 01. Inlet chimney duct; 02. Centrifugal blower; 03. Bypass ventilation duct; 04. Hot air outlet duct; 05. Flue gas inlet duct; 06. Crossover duct; 07. Flue gas outlet duct; 08. Air preheater one; 09. Inlet duct; 1. Inlet air volume regulating grille; 101. Inlet frame; 102. Divider plate; 103. Grille plate; 104. Connecting plate; 105. Drive plate; 106. Rotating handle; 107. Connecting plate; 2. Suction hood; 3. Centrifugal exhaust fan; 4. Flexible connection flange; 5. Crossover duct; 6. Air preheater two; 7. Bypass baffle valve; 8. Bypass ventilation duct; 9. High-temperature flue gas inlet duct; 10. Hot air delivery duct; 11. Low-temperature flue gas outlet duct. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1: AsFigure 2 - to Figure 3 The utility model discloses a novel air preheater for refining industry, including air preheater no. 6, the flue gas import and flue gas export of air preheater no. 6 are connected with high temperature import smoke pipe 9 and low temperature export smoke pipe 11 respectively, and the high temperature section air outlet of air preheater no. 6 is connected with hot air delivery pipe 10, and the low temperature section air inlet of air preheater no. 6 is connected with air volume adjusting grille 1, and the low temperature section air outlet of air preheater no. 6 is connected with centrifugal exhaust fan 3, and the outlet of centrifugal exhaust fan 3 is connected with cross connecting pipe 5, and the side export of cross connecting pipe 5 is connected with the high temperature section air inlet of air preheater no. 6, and the top export of cross connecting pipe 5 is connected with bypass air pipe 8, and bypass air pipe 8 is connected with hot air delivery pipe 10, and is equipped with bypass damper valve 7 on bypass air pipe 8.

[0022] When working, cold air enters from air volume adjusting grille 1, then enters the low temperature section of air preheater no. 6 and exchanges heat with low temperature flue gas, then enters centrifugal exhaust fan 3, has greater energy under the work of centrifugal exhaust fan 3 and pressurization, realizes the conversion of kinetic energy into potential energy in cross connecting pipe 5, overcomes resistance drop, then enters the high temperature section of air preheater no. 6 and exchanges heat with high temperature flue gas, goes to hot air delivery pipe 10 after temperature rise, then enters combustion furnace.

[0023] In winter, bypass damper valve 7 is opened, bypass air first exchanges heat with low temperature flue gas in the low temperature section of air preheater no. 6, temperature rises, then directly enters hot air delivery pipe 10 through bypass air pipe 8, then enters combustion furnace, and the air temperature entering combustion furnace is higher than the air temperature under the present process, so the fuel consumption is reduced.

[0024] In the embodiment two, on the basis of the embodiment one, the air inlet of cross connecting pipe 5 is directly below the top export, and the air inlet of cross connecting pipe 5 is connected with the air outlet of centrifugal exhaust fan 3 through soft connection flange 4.

[0025] The inlet of centrifugal exhaust fan 3 is connected with suction hood 2, and the other end of suction hood 2 is connected with the low temperature section air outlet of air preheater no. 6. Suction hood 2 can be circular or square, and is not restricted.

[0026] Air volume adjusting grille 1 includes air inlet frame 101 matched with the low temperature section air inlet of air preheater no. 6, and is equipped with air volume adjusting assembly on air inlet frame 101, and the air volume adjusting assembly includes a plurality of grid plates 103 that can adjust the air volume by rotating, and the grid plate 103 is connected with the driving device that drives its rotation.

[0027] The driving device comprises a connecting plate 104 fixedly connected to the middle part of each grid plate 103, a plurality of connecting plates 104 are hingedly connected with the same driving plate 105, one end of the driving plate 105 is hingedly connected with a connecting plate 107, the other end of the connecting plate 107 is hingedly connected with a rotating handle 106, and the rotating handle 106 is rotatably installed on the air inlet frame 101. The air inlet volume adjusting grid 1 adopts a light material and a multi-piece structure, cooperates with a control logic, is light in the whole, and is rapid in opening, adjusting and closing. The oxygen content of the hearth is rapidly adjusted, and the fluctuation range is small. When the air inlet volume is adjusted, the rotating handle 106 can be moved, the driving plate 105 is driven to move through the connecting plate 107, and the grid plate 103 is driven to rotate through the connecting plate 104, so that the air inlet volume is adjusted.

[0028] The end of the rotating handle 106 away from the connecting plate 107 is hingedly connected with an electric telescopic rod, the electric telescopic rod is connected with a controller, a temperature sensor one is arranged in the hot air conveying pipe 10, a temperature sensor two is arranged in the air inlet frame 101, a temperature sensor three is arranged in the low-temperature smoke outlet pipe 11, a temperature sensor four is arranged in the cross-pipe 5, and a temperature sensor five is arranged in the high-temperature smoke inlet pipe 9; the controller is connected with the temperature sensor one, the temperature sensor two, the temperature sensor three, the temperature sensor four, the temperature sensor five, the electric telescopic rod, the centrifugal exhaust fan 3 and the bypass baffle valve 7. The controller is a PLC controller.

[0029] The middle part of the air inlet frame 101 is fixedly connected with a partition frame plate 102 for partitioning the air inlet frame 101 into upper and lower air inlet regions, and the air volume adjusting assembly is arranged in each air inlet region.

[0030] The basic principle and main features of the utility model and the advantages of the utility model are shown and described. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only for illustrating the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A new type of air preheater for the refining industry, comprising an air preheater two (6), the flue gas inlet and outlet of the air preheater two (6) are connected with a high-temperature flue gas inlet pipe (9) and a low-temperature flue gas outlet pipe (11) respectively, and the high-temperature section air outlet of the air preheater two (6) is connected with a hot air conveying pipe (10), characterized in that: The low-temperature section air inlet of the air preheater two (6) is connected with an air volume adjusting grille (1), the low-temperature section air outlet of the air preheater two (6) is connected with a centrifugal exhaust fan (3), the outlet of the centrifugal exhaust fan (3) is connected with a cross-pipe (5), the side outlet of the cross-pipe (5) is connected with the high-temperature section air inlet of the air preheater two (6), the top outlet of the cross-pipe (5) is connected with a bypass air pipe (8), the bypass air pipe (8) is connected with a hot air conveying pipe (10), and the bypass air pipe (8) is provided with a bypass damper valve (7). ​ 2. A new type of air preheater for the refining industry as claimed in claim 1, wherein: The air inlet of the cross-pipe (5) is directly below the top outlet, and the air inlet of the cross-pipe (5) is connected with the air outlet of the centrifugal exhaust fan (3) through a soft connection flange (4).

3. A new type of air preheater for the refining industry as claimed in claim 1, wherein: The inlet of the centrifugal exhaust fan (3) is connected with a suction hood (2), and the other end of the suction hood (2) is connected with the low-temperature section air outlet of the air preheater two (6).

4. A new type of air preheater for the refining industry as claimed in claim 1, wherein: The air volume adjusting grille (1) comprises an air inlet frame (101) matched with the low-temperature section air inlet of the air preheater two (6), the air inlet frame (101) is provided with an air volume adjusting assembly, the air volume adjusting assembly comprises a plurality of grille plates (103) capable of adjusting the air volume by rotating, and the grille plates (103) are connected with driving devices for driving the rotation of the grille plates (103).

5. A novel air preheater for the refining industry as claimed in claim 4, wherein: The driving devices comprise a plurality of connecting plates (104) fixedly connected to the middle portions of the grille plates (103), the connecting plates (104) are hingedly connected with a same driving plate (105), one end of the driving plate (105) is hingedly connected with a connecting plate (107), the other end of the connecting plate (107) is hingedly connected with a rotating handle (106), and the rotating handle (106) is rotatably installed on the air inlet frame (101).

6. A novel air preheater for the refining industry as claimed in claim 5, wherein: The rotating handle (106) is hingedly connected with an electric telescopic rod away from the connecting plate (107), the electric telescopic rod is connected with a controller, a temperature sensor one is arranged in the hot air conveying pipe (10), a temperature sensor two is arranged in the air inlet frame (101), a temperature sensor three is arranged in the low-temperature smoke outlet pipe (11), a temperature sensor four is arranged in the cross-pipe (5), and a temperature sensor five is arranged in the high-temperature smoke inlet pipe (9), and the controller is connected with the temperature sensor one, the temperature sensor two, the temperature sensor three, the temperature sensor four, the temperature sensor five, the electric telescopic rod, the centrifugal exhaust fan (3) and the bypass damper valve (7).

7. A new type of air preheater for the refining industry as claimed in claim 4, wherein: The middle portion of the air inlet frame (101) is fixedly connected with a partition frame plate (102) for separating the air inlet frame (101) into upper and lower air inlet regions, and the upper and lower air inlet regions are both provided with the air volume adjusting assembly.

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