A regenerative air preheater

Abstract

The application discloses a regenerative air preheater. The regenerative air preheater comprises a left regenerative chamber, a right regenerative chamber, an eight-way air tank and an actuator. The eight-way air tank is cuboid and horizontally arranged. The left regenerative chamber and the right regenerative chamber are horizontally arranged on the left side and the right side of the eight-way air tank respectively, and the actuator is arranged at one end of the eight-way air tank. The eight-way air tank mainly comprises an air tank shell, an internal slider and a sealing ring. The left side and the right side of the air tank shell are respectively provided with four shell interfaces, the left surface and the right surface of the internal slider are respectively provided with eight slider interfaces, and the shell interfaces and the slider interfaces are sealed by the sealing ring. The actuator makes intermittent linear reciprocating motion to push and pull the internal slider, so that the material flow passes through different internal channels and enters different regenerative chambers to complete heat exchange. The regenerative air preheater can be stacked in multiple groups to form multiple small, medium and large regenerative air preheaters for selection.

Description

TECHNICAL FIELD

[0001] The present application relates to an air preheater, in particular to a regenerative air preheater. BACKGROUND

[0002] In recent years, a regenerative heat exchange technology is applied in various industrial furnaces in China, high-temperature flue gas is used to heat the regenerator, and the heat stored in the regenerator is used to heat the air, so that the air is preheated to a high temperature, and after the regenerator is cooled, it is switched to a high-temperature flue gas heating state, and the cycle is repeated to achieve the purpose of waste heat recovery. The regenerative heat exchanger has high heat exchange efficiency, low investment, obvious energy-saving effect and great environmental protection effect. Since honeycomb ceramic is used as the regenerator, even if the dew point of the flue gas is generated, the honeycomb ceramic will not be corroded, so the regenerative heat exchange technology has great significance for further reducing the flue gas temperature of various industrial furnaces and avoiding the dew point corrosion of the heat exchanger.

[0003] Chinese patent CN 201410139676.9 discloses a regenerative heat exchanger, which uses four regenerative chambers in parallel to form four channels to ensure continuous operation of the heat exchanger. However, for flue gas, the four channels formed by the four regenerative chambers are actually only two channels, and when one channel is reversed, only one channel is working, and all the flue gas flows into this channel, which suddenly increases the pressure drop of the flue gas flowing through the regenerative chamber, causing the furnace pressure to rise. Therefore, for industrial furnaces that require stable furnace pressure, four regenerative chambers are obviously insufficient. In addition, a pair of four-way reversing valves is arranged at both ends of a pair of regenerative chambers to work synchronously, but the patent does not explain how to ensure the synchronization of the pair of four-way reversing valves. If the synchronization of the pair of four-way reversing valves cannot be ensured, it will lead to the conflict between the flue gas channel and the air channel, which will also cause the system to fail.

[0004] Chinese patent CN 206191632U discloses a regenerative air preheater, which uses an eight-way valve to connect two U-shaped regenerative chambers, solving the problem of synchronous switching of flue gas and air between the two U-shaped regenerative chambers during valve switching, but when multiple such regenerative air preheaters are operated in parallel, since the eight-way valve has external interfaces on four sides, multiple eight-way valves cannot be stacked, resulting in a large occupied space. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a new type of regenerative air preheater, which uses multiple groups of stackable eight-way air boxes to replace eight-way valves, reduces the occupied space, and solves the problem of large-scale regenerative air preheaters.

[0006] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0007] The application discloses a heat accumulating type air preheater which is characterized by comprising an eight-way air box, a left heat accumulating chamber, a right heat accumulating chamber and an executing mechanism, the eight-way air box is horizontally arranged, the left heat accumulating chamber and the right heat accumulating chamber are horizontally arranged on the left side and the right side of the eight-way air box respectively, the executing mechanism comprises a push-pull rod, and the executing mechanism is installed at one end of the eight-way air box, the eight-way air box mainly comprises an air box shell, an internal slider and a sealing ring, the internal slider is arranged in the air box shell, the left and right surfaces of the internal slider are respectively provided with eight slider interfaces, the left and right sides of the air box shell are respectively provided with four shell interfaces, the internal slider of the eight-way air box is pushed and pulled by the push-pull rod of the executing mechanism, the odd number slider interfaces and the even number slider interfaces of the internal slider are alternately connected with the air box shell interfaces, the air box shell interfaces and the internal slider interfaces are sealed by the sealing ring, and the slider interfaces on the left and right surfaces of the internal slider are connected with each other by internal channels, so that the flow direction of the flow through the eight-way air box is changed.

[0008] The application further discloses the heat accumulating type air preheater which is characterized by that the slider is composed of a left sealing plate, a right sealing plate, upper and lower sealing plates, two end sealing plates, a push-pull rod seat, an interface grid, a shrimp waist and a cross channel, the push-pull rod seat is located at the center of the two end sealing plates, a plurality of air resistance prevention holes are arranged on the two end sealing plates, eight slider interfaces are horizontally arranged at the center of the left sealing plate and the right sealing plate, the interface grid is located in the round hole of the slider interface, the outer surface of the interface grid is in the same plane with the outer surfaces of the left and right sealing plates, and the slider interfaces on the left and right surfaces of the internal slider are connected with each other by the shrimp waist or the cross channel.

[0009] The application further discloses the heat accumulating type air preheater which is characterized by that the inner diameter of the slider interface and the inner diameter of the shell interface are C, the center distance of the slider interface is B, and the center distance of the shell interface is A, A is 2 times of B, and B is 1.5-5 times of C.

[0010] The application further discloses the heat accumulating type air preheater which is characterized by that the heat accumulating type air preheater adopts a plurality of groups of upper and lower superposition modes.

[0011] The application further discloses the heat accumulating type air preheater which is characterized by that the left heat accumulating chamber and the right heat accumulating chamber are U-shaped heat accumulating chambers.

[0012] The application further discloses the heat accumulating type air preheater which is characterized by that when the internal slider slides to one end of the eight-way air box shell, the eight shell interfaces of the eight-way air box shell are connected with the eight odd number slider interfaces of the internal slider, and the eight even number slider interfaces of the internal slider are not connected; when the internal slider slides to the other end of the eight-way air box shell, the eight shell interfaces of the eight-way air box shell are connected with the eight even number slider interfaces of the internal slider, and the eight odd number slider interfaces of the internal slider are not connected.

[0013] The heat accumulating air preheater further has the following technical features: the left heat accumulating chamber and the right heat accumulating chamber are each composed of a shell, a lining and two heat accumulating bodies, are each arranged in a U-shaped plane, each have two straight section cavities, and each have two external interfaces, and each of the left heat accumulating chamber and the right heat accumulating chamber is filled with one heat accumulating body.

[0014] The heat accumulating air preheater further has the following technical features: the bottom of the internal sliding block is provided with a rolling support between the eight-way air bellow shell, and the rolling support comprises a rolling pin and a flat retainer assembly.

[0015] The heat accumulating air preheater further has the following technical features: the rolling pin is a polytetrafluoroethylene rod.

[0016] The heat accumulating air preheater further has the following technical features: the actuator is a straight stroke actuator, and the actuator is preferably an electric push rod.

[0017] The heat accumulating air preheater further has the following technical features: the eight-way air bellow shell has an outer shape of a cuboid.

[0018] The heat accumulating air preheater further has the following technical features: each shell interface of the eight-way air bellow shell is provided with two sealing rings on the contact surface of the internal sliding block.

[0019] The heat accumulating air preheater further has the following technical features: the sealing ring is a spring energy storage sealing ring.

[0020] The heat accumulating air preheater further has the following technical features: the shrimp waist is a 180° elbow pipe.

[0021] The heat accumulating air preheater further has the following technical features: the heat exchange method of the heat accumulating air preheater comprises the following contents.

[0022] The internal sliding block is intermittently linearly reciprocated under the push-pull of the actuator, so that the flue gas flow ① and the air flow ② pass through different internal channels in the internal sliding block to complete the heat exchange of the flows.

[0023] 1) When the internal sliding block slides to one end of the eight-way air bellow shell, the eight shell interfaces of the eight-way air bellow shell are connected to the eight sliding block interfaces numbered as odd numbers (i.e. 1, 3, 5, 7, 9, 11, 13 and 15) of the internal sliding block, and the eight sliding block interfaces numbered as even numbers (i.e. 2, 4, 6, 8, 10, 12, 14 and 16) of the internal sliding block are empty. At this time, the flue gas flow ① flows through the left heat accumulating chamber and exchanges heat with the left heat accumulating body, and the air flow ② flows through the right heat accumulating chamber and exchanges heat with the right heat accumulating body.

[0024] 3) When the inner slider slides to the other end of the eight-way air bellow housing, the eight housing interfaces of the eight-way air bellow housing are connected with the eight even-numbered slider interfaces (i.e. 2, 4, 6, 8, 10, 12, 14, 16) of the inner slider, and the eight odd-numbered slider interfaces (i.e. 1, 3, 5, 7, 9, 11, 13, 15) of the inner slider are empty. At this time, the flue gas stream ① flows through the right regenerator and exchanges heat with the right regenerator; the air stream ② flows through the left regenerator and exchanges heat with the left regenerator.

[0025] The beneficial effects of the present application compared with the prior art are:

[0026] The regenerative air preheater provided by the present application has different inner slider positions and different inner channels for the flow, and the inner slider makes intermittent linear reciprocating motion under the push and pull of the actuator, so that the flow passes through different inner channels and enters different regenerators to complete the heat exchange of the flow. Therefore, the heat exchange of the flue gas and the air can be completed by using the present application. Since the honeycomb ceramic is used as the regenerator, there is no problem of low-temperature dew point corrosion of the flue gas, so the present application can reduce the flue gas temperature more and recover more flue gas waste heat.

[0027] The regenerative air preheater provided by the present application can be stacked in multiple groups to form multiple small, medium and large regenerative air preheaters for selection.

[0028] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments, but the accompanying drawings and specific embodiments do not limit the scope of the present application.

[0029] ACCOMPANYING DRAWINGS AND DRAWING DESCRIPTION

[0030] Figure 1 The present application is a regenerative air preheater;

[0031] Figure 2 The present application is a regenerative air preheater;

[0032] Figure 3 The present application is a regenerative air preheater;

[0033] Figure 4 The present application is a regenerative air preheater;

[0034] Figure 5 The present application is a regenerative air preheater;

[0035] Figure 6 The present application is a regenerative air preheater;

[0036] Figure 7 A slider (Southeast isometric view, see 1-8 slider openings);

[0037] Figure 8 A slider (Northeast isometric view, see 9-16 slider openings);

[0038] Figure 9 A slider cross-sectional view (Southeast isometric view);

[0039] Figure 10 A slider cross-sectional view (Northeast isometric view);

[0040] Figure 11 A slider internal component shrimp waist;

[0041] Figure 12 A slider internal component cross-connection channel;

[0042] Figure 13 A U-shaped regenerative chamber;

[0043] Figure 14 A U-shaped regenerative chamber;

[0044] Figure 15 A 3D cross-sectional view of a regenerative air preheater (when the internal slider is at the bottom end of the bellows shell) of the present application;

[0045] Figure 16 A Figure 15 Flow path schematic of flue gas stream ① and air stream ②;

[0046] Figure 17 A 3D cross-sectional view of a regenerative air preheater (when the internal slider is at the top end of the bellows shell) of the present application;

[0047] Figure 18 A Figure 17 Flow path schematic of flue gas stream ① and air stream ②;

[0048] Figure 19 Three groups of superimposed regenerative air preheaters of the present application;

[0049] Figure 20 Working process of a regenerative air preheater of the present application.

[0050] The reference signs shown in the figure are:

[0051] 100, regenerative air preheater;

[0052] 1, slider interface; 2, slider interface; 3, slider interface; 4, slider interface;

[0053] 5, slider interface; 6, slider interface; 7, slider interface; 8, slider interface;

[0054] 9, slider interface; 10, slider interface; 11, slider interface; 12, slider interface;

[0055] 13, slider interface; 14, slider interface; 15, slider interface; 16, slider interface;

[0056] 20, eight bellow;

[0057] 21, housing interface; 22, housing interface; 23, housing interface; 24, housing interface;

[0058] 25, housing interface; 26, housing interface; 27, housing interface; 28, housing interface;

[0059] 30, bellow housing;

[0060] 31, upper cover plate; 32, lower cover plate; 33, left cover plate;

[0061] 34, right cover plate; 35, bottom end cover plate; 36, top end cover plate;

[0062] 37, bracket; 38, large and small sealing ring groove; 39, needle bearing;

[0063] 40, slider;

[0064] 41, left sealing plate; 42, right sealing plate; 43, upper and lower sealing plate;

[0065] 44, two end sealing plate; 45, push-pull rod seat; 46, interface grid;

[0066] 47, shrimp waist; 48, cross-connection channel; 49, air resistance prevention hole;

[0067] 50, left heat storage chamber;

[0068] 51, housing; 52, lining; 53, one chamber; 54, heat storage body; 55, two chambers;

[0069] 56, heat storage body; 57, heat storage chamber interface; 58, heat storage chamber interface;

[0070] 60, right heat storage chamber;

[0071] 61, housing; 62, lining; 63, one chamber; 64, heat storage body; 65, two chambers;

[0072] 66, heat storage body; 67, heat storage chamber interface; 68, heat storage chamber interface;

[0073] 70, large seal ring; 71, small seal ring;

[0074] 80, actuator; 81, push-pull rod. DETAILED DESCRIPTION

[0075] In the description of the present application, it should be understood that the terms "left", "right", "horizontal", "inner", "upper", "lower" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.

[0076] The present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application is more thorough and complete, and the scope of the present application is fully conveyed to those skilled in the art.

[0077] As shown in Figure 1 , the regenerative air preheater 100 of the present application is mainly composed of an eight-way air box 20, a left regenerator 50, a right regenerator 60 and an actuator 80. The eight-way air box is a rectangular parallelepiped and is arranged horizontally. The actuator 80 is a straight stroke actuator and is installed at one end of the eight-way air box 20. The left regenerator 50 and the right regenerator 60 are horizontally arranged on both sides of the eight-way air box 20, and the actuator 80 includes a push-pull rod 81. The flue gas stream ① and the air stream ② complete heat exchange in the left regenerator 50 and the right regenerator 60 through the eight-way air box 20.

[0078] As shown in Figure 2 , the regenerative air preheater 100 of the present application is mainly composed of an eight-way air box 20, a left regenerator 50, a right regenerator 60 and an actuator 80. The eight-way air box is a rectangular parallelepiped and is arranged horizontally. The actuator 80 is a straight stroke actuator and is installed at one end of the eight-way air box 20. The left regenerator 50 and the right regenerator 60 are horizontally arranged on both sides of the eight-way air box 20, and the actuator 80 includes a push-pull rod 81. The flue gas stream ① and the air stream ② complete heat exchange in the left regenerator 50 and the right regenerator 60 through the eight-way air box 20. Figure 2 As shown in , the regenerative air preheater 100 of the present application is mainly composed of an eight-way air box 20, a left regenerator 50, a right regenerator 60 and an actuator 80. The eight-way air box is a rectangular parallelepiped and is arranged horizontally. The actuator 80 is a straight stroke actuator and is installed at one end of the eight-way air box 20. The left regenerator 50 and the right regenerator 60 are horizontally arranged on both sides of the eight-way air box 20, and the actuator 80 includes a push-pull rod 81. The flue gas stream ① and the air stream ② complete heat exchange in the left regenerator 50 and the right regenerator 60 through the eight-way air box 20.

[0079] As shown inFigure 3 and Figure 4 As shown in the figure, eight ventilators 20 are mainly composed of windbox shell 30 and slider 40, and the interface between windbox shell 30 and slider 40 is sealed by large sealing ring 70 and small sealing ring 71. Large sealing ring 70 and small sealing ring 71 are concentrically arranged with the shell interface of windbox shell 30, and each shell interface is sealed by two sealing rings (large sealing ring 70 and small sealing ring 71). Large sealing ring 70 and small sealing ring 71 are both elastic sealing rings, which are composed of a polymeric material sealing shell and a corrosion-resistant stainless steel spring. The sealing ring is installed in a groove, and the spring is under pressure, forming an outward tension, providing a permanent elastic force to the sealing shell, thereby forming an elastic seal. Each shell interface has two sealing rings, so that four seals are formed between the shell interface to the shell interface, and even if each seal has a 5% leakage rate, after passing through four seals, the leakage rate of the material flow from one shell interface to another shell interface tends to be zero.

[0080] As shown in the figure, Figure 5 and Figure 6 Windbox shell 30 is mainly composed of upper cover plate 31, lower cover plate 32, left cover plate 33, right cover plate 34, bottom end cover plate 35, top end cover plate 36, bracket 37 and needle roller bearing 39. Bracket 37 is installed on the outside of top end cover plate 36 to support actuator 80. Needle roller bearing 39 is installed on the upper surface of lower cover plate 32. Upper cover plate 31, lower cover plate 32, left cover plate 33, right cover plate 34, bottom end cover plate 35 and top end cover plate 36 are connected by bolts to form a rectangular parallelepiped. Left cover plate 33 has shell interface 21, shell interface 22, shell interface 23 and shell interface 24, and right cover plate 34 has shell interface 25, shell interface 26, shell interface 27 and shell interface 28. The inner wall of the shell interface of left cover plate 33 has large and small sealing ring grooves 38, which are concentric with the shell interface, and large sealing ring 70 and small sealing ring 71 are respectively installed in the grooves. Similarly, the inner wall of the shell interface of right cover plate 34 also has large and small sealing ring grooves 38, which are concentric with the shell interface, and large sealing ring 70 and small sealing ring 71 are respectively installed in the grooves. Needle roller bearing 39 forms a rolling support at the bottom of slider 40, so that the friction coefficient between the bottom of slider 40 and windbox shell 30 is minimized.

[0081] As shown in the figure, Figure 5 The tube center distance between shell interface 21, shell interface 22, shell interface 23 and shell interface 22 is A.

[0082] As shown in the figure, Figure 6 The tube center distance between shell interface 25, shell interface 26, shell interface 27 and shell interface 28 is A.

[0083] As shown in the figure, Figures 7-10As shown, the slider 40 is composed of a left sealing plate 41, a right sealing plate 42, an upper and lower sealing plate 43, two end sealing plates 44, a push-pull rod seat 45, an interface grid 46, a shrimp waist 47 and a cross-connection channel 48. The push-pull rod seat 45 is located at the center of the two end sealing plates 44. A plurality of anti-gas blocking holes 49 are arranged on the two end sealing plates 44, and the anti-gas blocking holes 49 on the two end sealing plates 44 form a through channel, so that the gas between the bellow shell 30 and the slider 40 can flow through the anti-gas blocking holes 49 when the slider 40 slides, and the gas does not form a gas blocking to block the sliding of the slider 40. The left sealing plate 41, the right sealing plate 42, the upper and lower sealing plate 43 and the two end sealing plates 44 are welded to form a rectangular parallelepiped.

[0084] As shown in Figure 7 As shown, the center of the left sealing plate 41 of the slider 40 is horizontally arranged with eight round holes, and from left to right, they are slider interface 1, slider interface 2, slider interface 3, slider interface 4, slider interface 5, slider interface 6, slider interface 7 and slider interface 8. The interface grid 46 is located in the round hole of the slider interface 1-8, and the outer surface of the interface grid 46 is in the same plane as the outer surface of the left sealing plate 41. The function of the interface grid 46 is to prevent the large sealing ring 70 and the small sealing ring 71 from falling out of the large and small sealing ring groove 38 during the sliding of the slider 40.

[0085] As shown in Figure 7 As shown, the tube center distance between the slider interface 1, the slider interface 2, the slider interface 3, the slider interface 4, the slider interface 5, the slider interface 6, the slider interface 7 and the slider interface 8 is B, and the inner diameter of the slider interface and the inner diameter of the shell interface are C. The size of the shell interface tube center distance A is 2 times the size of the slider interface tube center distance B. B is 1.5-5 times C, that is, the size of the slider interface tube center distance B is 1.5-5 times the size of the slider interface inner diameter C, and the size of the slider interface tube center distance B is 1.5-5 times the size of the shell interface inner diameter C.

[0086] As shown in Figure 8 As shown, the center of the right sealing plate 42 of the slider 40 is also horizontally arranged with eight round holes, and from right to left, they are slider interface 9, slider interface 10, slider interface 11, slider interface 12, slider interface 13, slider interface 14, slider interface 15 and slider interface 16. The interface grid 46 is also located in the round hole of the slider interface 9-16, and the outer surface of the interface grid 46 is in the same plane as the outer surface of the right sealing plate 42.

[0087] As shown in Figure 8As shown, the tube center distance between the slider interface 9, the slider interface 10, the slider interface 11, the slider interface 12, the slider interface 13, the slider interface 14, the slider interface 15, and the slider interface 16 is B, and the inner diameter of the slider interface and the inner diameter of the shell interface are C. The size of the shell interface tube center distance A is 2 times the size of the slider interface tube center distance B. B is 1.5-5 times C, that is, the size of the slider interface tube center distance B is 1.5-5 times the size of the slider interface inner diameter C, and the size of the slider interface tube center distance B is 1.5-5 times the size of the shell interface inner diameter C.

[0088] As shown in Figure 11 The shrimp waist 47 is a 180° elbow pipe.

[0089] As shown in Figure 12 The cross-channel 48 is a special-shaped part as shown in the figure, which is composed of two 90° elbow pipes and a rectangular pipe with two ends closed and two end openings on the bottom plate. The top ends of the two 90° elbow pipes are welded with the two end openings on the bottom plate of the rectangular pipe to form a complete cross-channel. In order to ensure smooth flow, the two ends of the rectangular pipe are provided with inclined guide plates.

[0090] As shown in Figure 9 and Figure 10 The four shrimp waists 47 and the four cross-channels 48 are located inside the slider 40, and are regularly welded with different slider interfaces on the left sealing plate 41 and the right sealing plate 42, so that the slider interfaces are regularly communicated two by two. The specific numbers of the slider interfaces communicated two by two are:

[0091] The slider interface 1 communicates with the slider interface 11;

[0092] The slider interface 2 communicates with the slider interface 4;

[0093] The slider interface 3 communicates with the slider interface 9;

[0094] The slider interface 4 communicates with the slider interface 2;

[0095] The slider interface 5 communicates with the slider interface 7;

[0096] The slider interface 6 communicates with the slider interface 16;

[0097] The slider interface 7 communicates with the slider interface 5;

[0098] The slider interface 8 communicates with the slider interface 14.

[0099] As shown in Figure 13As shown, the left regenerator 50 is composed of a shell 51, a lining 52, a regenerator 54, and a regenerator 56, arranged in a U-shaped plane, having two straight section cavities: a first chamber 53 and a second chamber 55, and two external interfaces: a regenerator interface 57 and a regenerator interface 58. The first chamber 53 is filled with the regenerator 54, and the second chamber 55 is filled with the regenerator 56. In this embodiment, the regenerator 54 is a high-temperature zone regenerator, which contacts high-temperature flue gas and high-temperature air, and has no risk of flue gas acid dew point corrosion, and can be made of honeycomb metal or honeycomb ceramic. The regenerator 56 is a low-temperature zone regenerator, which contacts low-temperature flue gas and normal-temperature air, and has a risk of flue gas acid dew point corrosion, and is made of honeycomb ceramic resistant to flue gas acid dew point corrosion. The lining 52 is an acid-resistant lining resistant to flue gas acid dew point corrosion.

[0100] As shown, Figure 14 the right regenerator 60 is composed of a shell 61, a lining 62, a regenerator 64, and a regenerator 66, arranged in a U-shaped plane, having two straight section cavities: a first chamber 63 and a second chamber 65, and two external interfaces: a regenerator interface 67 and a regenerator interface 68. The first chamber 63 is filled with the regenerator 64, and the second chamber 65 is filled with the regenerator 66. In this embodiment, the regenerator 64 is a high-temperature zone regenerator, which contacts high-temperature flue gas and high-temperature air, and has no risk of flue gas acid dew point corrosion, and can be made of honeycomb metal or honeycomb ceramic. The regenerator 66 is a low-temperature zone regenerator, which contacts low-temperature flue gas and normal-temperature air, and has a risk of flue gas acid dew point corrosion, and is made of honeycomb ceramic resistant to flue gas acid dew point corrosion. The lining 62 is an acid-resistant lining resistant to flue gas acid dew point corrosion. The right regenerator 60 has the same shape and size as the left regenerator 50.

[0101] Figure 15 and Figure 17 as shown in the two working positions of the regenerative air preheater 100 of the present application, Figure 15 as shown in the working position when the slider 40 stays at the bottom end of the bellow shell 30, which is working position one, Figure 17 as shown in the working position when the slider 40 stays at the top end of the bellow shell 30, which is working position two. Figure 16 as shown in the working position one, Figure 15 as shown in the working position one, Figure 18 as shown in the working position two, Figure 17 as shown in the working position two.

[0102] As shown in the two working positions of the regenerative air preheater 100 of the present application, Figure 15 and Figure 17 it can be seen that the plane arrangement of the regenerative air preheater 100 of the present application is that eight bellow 20s are arranged in the middle, and the left regenerator 50 and the right regenerator 60 are arranged on the left and right sides of the eight bellow 20s. The actuator 80 is installed on the support 37 of the bellow shell 30. The shell interfaces of the eight bellow 20s are bolted to the left regenerator 50 and the right regenerator 60, and the connection interface number correspondence is as follows:

[0103] The shell interface 22 connects the heat storage interface 57 of the left heat storage chamber 50;

[0104] The shell interface 23 connects the heat storage interface 58 of the left heat storage chamber 50;

[0105] The shell interface 26 connects the heat storage interface 67 of the right heat storage chamber 60;

[0106] The shell interface 27 connects the heat storage interface 68 of the right heat storage chamber 60.

[0107] As shown in Figure 15 and Figure 16 , under the action of the intermittent reciprocating movement of the actuator 80, the slider 40 is currently at the bottom end of the bellow shell 30, and the eight shell interfaces of the bellow shell 30 are one-to-one connected with the eight even slider interfaces of the slider 40. The specific connection numbers are as follows:

[0108] The shell interface 21 connects the slider interface 2;

[0109] The shell interface 22 connects the slider interface 4;

[0110] The shell interface 23 connects the slider interface 6;

[0111] The shell interface 24 connects the slider interface 8;

[0112] The shell interface 25 connects the slider interface 10;

[0113] The shell interface 26 connects the slider interface 12;

[0114] The shell interface 27 connects the slider interface 14;

[0115] The shell interface 28 connects the slider interface 16.

[0116] As shown in Figure 16 and Figure 15 , at this time, the flue gas stream ① enters the heat release of the present application from the outside into a heat storage type air preheater 100. The specific flow path is as follows:

[0117] The flue gas stream ① enters the eight-way bellow 20 for the first time through the shell interface 21, then enters the slider 40 through the slider interface 2 connected with the shell interface 21, and then is guided out of the slider 40 through the shrimp waist 47 connecting the slider interface 2 and the slider interface 4, and then is discharged from the eight-way bellow 20 for the first time through the shell interface 22 connected with the slider interface 4.

[0118] After the flue gas stream ① first exits the eight-bank draft hood 20 from the shell interface 22, it enters the left regenerator 50 through the regenerator interface 57 connected with the shell interface 22, first enters the first chamber 53 to release heat to the regenerator 54, then enters the second chamber 55 to release heat to the regenerator 56, and then exits the left regenerator 50 through the regenerator interface 58.

[0119] After the flue gas stream ① exits the left regenerator 50 from the regenerator interface 58, it secondly enters the eight-bank draft hood 20 through the shell interface 23 connected with the regenerator interface 58, then enters the slider 40 through the slider interface 8 butted against the shell interface 28, and then exits the slider 40 through the cross-channel 48 connecting the slider interface 8 and the slider interface 16, and then secondly exits the eight-bank draft hood 20 through the shell interface 28 butted against the slider interface 16.

[0120] After the flue gas stream ① secondly exits the eight-bank draft hood 20, it leaves the regenerative air preheater 100 of the present application, and completes heat release.

[0121] As shown in FIGS. Figure 16 and Figure 15 At this time, the air stream ② enters the regenerative air preheater 100 of the present application from the outside to absorb heat, and the specific flow path is as follows:

[0122] The air stream ② first enters the eight-bank draft hood 20 through the shell interface 24, then enters the slider 40 through the slider interface 8 butted against the shell interface 24, and then exits the slider 40 through the cross-channel 48 connecting the slider interface 8 and the slider interface 14, and then first exits the eight-bank draft hood 20 through the shell interface 27 butted against the slider interface 14.

[0123] After the air stream ② first exits the eight-bank draft hood 20 from the shell interface 27, it enters the right regenerator 60 through the regenerator interface 68 connected with the shell interface 27, first enters the second chamber 65 to absorb heat from the regenerator 66, then enters the first chamber 63 to continue absorbing heat from the regenerator 64, and then exits the right regenerator 60 through the regenerator interface 67.

[0124] After the air stream ② exits the right regenerator 60 from the regenerator interface 67, it secondly enters the eight-bank draft hood 20 through the shell interface 26 connected with the regenerator interface 67, then enters the slider 40 through the slider interface 12 butted against the shell interface 26, and then exits the slider 40 through the shrimp waist 47 connecting the slider interface 12 and the slider interface 10, and then secondly exits the eight-bank draft hood 20 through the shell interface 25 butted against the slider interface 10.

[0125] After the air stream ② secondly exits the eight-bank draft hood 20, it leaves the regenerative air preheater 100 of the present application, and completes heat absorption.

[0126] Figure 16 ForFigure 15 The concise flow chart of flue gas stream ① and air stream ② in the case shown, the flow path of flue gas stream ① and air stream ② is as follows (wherein the number in □ is the regenerator number, and the rest of the numbers are the interface numbers through which flue gas stream ① and air stream ② flow) :

[0127]

[0128] From Figure 16 As can be seen from the above flow path, when the slider 40 stays at the bottom end of the wind box shell 30, flue gas stream ① and air stream ② go through the even slider interfaces of the slider 40, flue gas stream ① releases heat in the left regenerator 50, and air stream ② absorbs heat in the right regenerator 60, the two streams each go their own way and do not interfere with each other.

[0129] As Figure 17 and Figure 18 shown, under the action of the intermittent reciprocating movement of the actuator 80, the slider 40 stays at the top end of the wind box shell 30 at this time, the eight shell interfaces of the wind box shell 30 are matched with the eight odd slider interfaces of the slider 40 one by one, and the specific matching numbers are as follows:

[0130] The shell interface 21 matches the slider interface 1;

[0131] The shell interface 22 matches the slider interface 3;

[0132] The shell interface 23 matches the slider interface 5;

[0133] The shell interface 24 matches the slider interface 7;

[0134] The shell interface 25 matches the slider interface 9;

[0135] The shell interface 26 matches the slider interface 11;

[0136] The shell interface 27 matches the slider interface 13;

[0137] The shell interface 28 matches the slider interface 15.

[0138] As Figure 18 and Figure 17 shown, at this time, flue gas stream ① enters the regenerative air preheater 100 of the present application from the outside to release heat, and the specific flow path is as follows:

[0139] Flue gas stream ① enters the eight-way wind box 20 for the first time through the shell interface 21, then enters the slider 40 through the slider interface 1 matched with the shell interface 21, and is guided out of the slider 40 through the cross-connection channel 48 connecting the slider interface 1 and the slider interface 11, and then exits the eight-way wind box 20 for the first time through the shell interface 26 matched with the slider interface 11.

[0140] After the flue gas stream ① first exits the eight-bank draft hood 20 from the shell interface 26, it enters the right regenerator 60 through the regenerator interface 67 connected with the shell interface 26, first enters the first chamber 63 to release heat to the regenerator 64, then enters the second chamber 65 to release heat to the regenerator 66, and then exits the right regenerator 60 through the regenerator interface 68.

[0141] After the flue gas stream ① exits the right regenerator 60 from the regenerator interface 68, it secondly enters the eight-bank draft hood 20 through the shell interface 27 connected with the regenerator interface 68, then enters the slider 40 through the slider interface 13 butted with the shell interface 27, and then exits the slider 40 through the shrimp waist 47 connected with the slider interface 13 and the slider interface 15, and then secondly exits the eight-bank draft hood 20 through the shell interface 28 butted with the slider interface 15.

[0142] After the flue gas stream ① secondly exits the eight-bank draft hood 20, it leaves the regenerative air preheater 100 of the present application, and completes heat release.

[0143] As shown in FIGS. Figure 18 and Figure 17 At this time, the air stream ② enters the regenerative air preheater 100 of the present application from the outside to absorb heat, and the specific flow path is as follows:

[0144] The air stream ② first enters the eight-bank draft hood 20 through the shell interface 24, then enters the slider 40 through the slider interface 7 butted with the shell interface 24, and then exits the slider 40 through the shrimp waist 47 connected with the slider interface 7 and the slider interface 5, and then first exits the eight-bank draft hood 20 through the shell interface 23 butted with the slider interface 5.

[0145] After the air stream ② first exits the eight-bank draft hood 20 from the shell interface 23, it enters the left regenerator 50 through the regenerator interface 58 connected with the shell interface 23, first enters the second chamber 55 to absorb heat from the regenerator 56, then enters the first chamber 53 to continue absorbing heat from the regenerator 54, and then exits the left regenerator 50 through the regenerator interface 57.

[0146] After the air stream ② exits the left regenerator 50 from the regenerator interface 57, it secondly enters the eight-bank draft hood 20 through the shell interface 22 connected with the regenerator interface 57, then enters the slider 40 through the slider interface 3 butted with the shell interface 22, and then exits the slider 40 through the cross-channel 48 connected with the slider interface 3 and the slider interface 9, and then secondly exits the eight-bank draft hood 20 through the shell interface 25 butted with the slider interface 9.

[0147] After the air stream ② secondly exits the eight-bank draft hood 20, it leaves the regenerative air preheater 100 of the present application, and completes heat absorption.

[0148] Figure 18 ForFigure 17 The simple flow chart of flue gas stream ① and air stream ② in the case shown, the flow path of flue gas stream ① and air stream ② is as follows (wherein the number in □ is the number of regenerator, and the rest of the numbers are the numbers of the interface through which flue gas stream ① and air stream ② flow) :

[0149]

[0150] From Figure 18 As can be seen from the above flow path, when the slider 40 stays at the top end of the wind box shell 30, flue gas stream ① and air stream ② pass through the odd-numbered slider interfaces of the slider 40, flue gas stream ① releases heat in the right regenerator 60, and air stream ② absorbs heat in the left regenerator 50, the two streams go their own way without interfering with each other.

[0151] The actuator 80 performs intermittent reciprocating linear motion, and pushes and pulls the slider 40 to stay intermittently between the bottom end and the top end of the wind box shell 30, so that the eight even-numbered slider interfaces and the eight odd-numbered slider interfaces of the slider 40 are alternately connected with the eight shell interfaces, thereby making flue gas stream ① alternately release heat in the left regenerator 50 and the right regenerator 60, and air stream ② alternately absorb heat in the right regenerator 60 and the left regenerator 50. Under the action of the slider 40, the two streams are physically synchronized in the two U-shaped regenerators, each goes its own way, and there is no case that the two streams enter the same U-shaped regenerator at the same time, which is intrinsically safe.

[0152] The regenerative air preheater described in the present application can be stacked in multiple groups, for example, as shown in the figure, it is a regenerative air preheater stacked in three groups. Figure 19

[0153] Embodiment

[0154] The specific working process of the regenerative air preheater of the present application will be described in more detail below with reference to the accompanying drawings.

[0155] The inlet / outlet temperature of flue gas stream ① is 240℃ / 85℃, and the inlet temperature of air stream ② is 20℃. The regenerative air preheater of the present application is selected. It is assumed that the working time of the slider of the regenerative air preheater of the present application is 6 minutes.

[0156] In order to ensure that flue gas stream ① and air stream ② continuously flow when the actuator of the regenerative air preheater of the present application is in action, three regenerative air preheaters are operated in parallel, and the three actuators act sequentially, that is:

[0157] When the actuator of the first regenerative air preheater is in action, the actuator of the second regenerative air preheater does not move;

[0158] ​Two minutes after the first regenerative air preheater actuator operates, the second regenerative air preheater actuator operates, while the first and third actuators remain stationary.

[0159] Two minutes after the second regenerative air preheater actuator operates, the third regenerative air preheater actuator operates, while the first and second actuators remain stationary.

[0160] Two minutes after the third regenerative air preheater actuator activated, the first regenerative air preheater actuator activated again, while the second and third actuators remained stationary.

[0161] The above process repeats itself endlessly.

[0162] The working process of a regenerative air preheater of the present invention is described in detail below.

[0163] 1. Initially, in working position one, slider 40 is at the bottom of the bellows housing 30.

[0164] When the regenerative air preheater 100 of the present invention starts working, the slider 40 is in Figure 15 The bottom of the bellows casing 30 shown is in working position one. Flue gas stream ① flows through the left regenerator chamber 50, releasing heat to regenerators 54 and 56 before cooling down. Initially, the temperature of flue gas stream ① exiting the left regenerator chamber 50 is approximately 70°C, gradually increasing over time. Air stream ② flows through the right regenerator chamber 60, absorbing heat from regenerators 66 and 64 before heating up.

[0165] 2. After 6 minutes, move to working position two, with slider 40 at the top of the bellows housing 30.

[0166] The slider 40 of the regenerative air preheater 100 of the present invention is in Figure 15 After working for 6 minutes at the indicated working position, the temperature of the flue gas stream ① exiting the left regenerator 50 rises to 85℃, triggering the actuator 80 to pull the slider 40 to the top of the wind box housing 30. Figure 17 The working position shown is 2. Flue gas stream ① flows through the right regenerator 60, releasing heat to regenerators 64 and 66 before cooling down. Initially, the temperature of flue gas stream ① exiting the right regenerator 60 is approximately 70°C, gradually increasing over time. Air stream ② flows through the left regenerator 50, absorbing heat from regenerators 56 and 54 before heating up.

[0167] 3. After 6 minutes, return to work position one and begin the next cycle.

[0168] The regenerative air preheater 100 of the present invention is in Figure 17After 6 minutes of working at the second working position, the temperature of flue gas stream ① out of the right regenerator 60 rises to 85℃, the actuator 80 is activated, pulling the slider 40 to the bottom end of the bellow housing 30, and returning to the first working position. Figure 15 The first working position is kept, and the above steps 1 and 2 are repeated, and the next cycle is started.

[0169] The above process is repeated, and the flue gas stream ① and the air stream ② complete continuous heat exchange with instantaneous discontinuous flow.

[0170] The above working process from 1 to 3 can be represented by a cycle process as follows. Figure 20

[0171] Since the three regenerative air preheaters are operated in parallel, the three actuators are sequentially activated, and when the actuator of the first regenerative air preheater is activated, the flue gas stream ① and the air stream ② flowing through the first regenerative air preheater are instantaneously discontinued, but since the actuators of the second and third regenerative air preheaters are not activated, the flue gas stream ① and the air stream ② flowing through the second and third regenerative air preheaters continue to flow, and the flow of the entire preheater is maintained. Similarly, when the actuator of the second regenerative air preheater is activated, the flue gas stream ① and the air stream ② flowing through the first and third regenerative air preheaters continue to flow; when the actuator of the third regenerative air preheater is activated, the flue gas stream ① and the air stream ② flowing through the first and second regenerative air preheaters continue to flow; therefore, the three regenerative air preheaters operated in parallel can ensure the continuous flow of the flue gas stream ① and the air stream ② and complete continuous heat exchange.​

Claims

1. A regenerative air preheater characterized by: The regenerative air preheater comprises an eight-way air box, a left regenerative chamber, a right regenerative chamber and an actuator, the eight-way air box is horizontally arranged, the left regenerative chamber and the right regenerative chamber are horizontally arranged on the left and right sides of the eight-way air box, the actuator comprises a push-pull rod, and the actuator is installed at one end of the eight-way air box, the eight-way air box mainly comprises an air box shell, an internal slider and a sealing ring, the internal slider is arranged inside the air box shell, the left and right surfaces of the internal slider are each provided with eight slider interfaces, the left and right sides of the air box shell are each provided with four shell interfaces, the internal slider of the eight-way air box is pushed and pulled by the actuator through the push-pull rod, the odd-numbered slider interfaces and the even-numbered slider interfaces of the internal slider are alternately connected with the air box shell interfaces, the air box shell interfaces and the internal slider interfaces are sealed by the sealing ring, and the slider interfaces on the left and right surfaces of the internal slider are connected with each other through internal channels, so that the flow direction of the flow through the eight-way air box is changed back and forth. The air box shell is composed of an upper cover plate, a lower cover plate, a left cover plate, a right cover plate, a bottom end cover, a top end cover plate, a support and a needle bearing, the support is installed on the outer side of the top end cover plate and supports the actuator, the needle bearing is installed on the upper surface of the lower cover plate, the upper cover plate, the lower cover plate, the left cover plate, the right cover plate, the bottom end cover plate and the top end cover plate are connected through bolts to form a cuboid, the left cover plate and the right cover plate are each provided with four shell interfaces, the inner wall of each shell interface is provided with two sealing ring grooves which are concentric with the shell interface, a large sealing ring and a small sealing ring are respectively arranged in the sealing grooves, and the needle bearing forms a rolling support at the bottom of the internal slider. The internal slider is composed of a left sealing plate, a right sealing plate, upper and lower sealing plates, two end sealing plates, a push-pull rod seat, an interface grid, shrimp waists and cross connection channels, the push-pull rod seat is located at the center of the two end sealing plates, the two end sealing plates are provided with a plurality of anti-air resistance holes, the center of the left sealing plate and the right sealing plate is horizontally arranged with eight slider interfaces, the interface grid is located in the circular hole of the slider interface, the outer surface of the interface grid is in the same plane as the outer surface of the left and right sealing plates, and the slider interfaces on the left and right surfaces of the internal slider are connected with each other through the shrimp waists or the cross connection channels. The internal slider reciprocally slides in the air box shell of the cuboid in the length direction of the cuboid, when the internal slider slides to one end of the eight-way air box shell, the eight shell interfaces of the eight-way air box shell are connected with the eight odd-numbered slider interfaces of the internal slider, and the eight even-numbered slider interfaces of the internal slider are empty; when the internal slider slides to the other end of the eight-way air box shell, the eight shell interfaces of the eight-way air box shell are connected with the eight even-numbered slider interfaces of the internal slider, and the eight odd-numbered slider interfaces of the internal slider are empty.

2. The regenerative air preheater of claim 1, wherein: The inner diameter of the slider interface and the inner diameter of the shell interface are C, the center distance of the slider interface is B, and the center distance of the shell interface is A, A is 2 times of B, and B is 1.5-5 times of C.

3. The regenerative air preheater of claim 1, wherein: The regenerative air preheater adopts a plurality of groups of upper and lower superimposed modes.

4. The regenerative air preheater of claim 1, wherein: The left regenerative chamber and the right regenerative chamber are both U-shaped regenerative chambers.

5. The regenerative air preheater of claim 1, wherein: The left and right regenerative chambers are composed of a shell, a lining and two regenerative bodies, are arranged in a U-shaped plane, have two straight section cavities, one chamber and two chambers, and have two external interfaces, one chamber and two chambers each filled with a regenerative body.

6. The regenerative air preheater of claim 1, wherein: The bottom of the inner slide is provided with a rolling support between the eight-ventilator shell, and the rolling support comprises a needle roller and a flat retainer assembly.

7. The regenerative air preheater of claim 6, wherein: The needle roller is a polytetrafluoroethylene rod.

8. The regenerative air preheater of claim 1, wherein: The actuator is a straight stroke actuator.

9. The regenerative air preheater of claim 1, wherein: The actuator is an electric push rod.

10. The regenerative air preheater of claim 1, wherein: The eight-ventilator shell is a cuboid.

11. The regenerative air preheater of claim 1, wherein: Each shell interface of the eight-ventilator shell is provided with two sealing rings on the inner slide contact surface.

12. The regenerative air preheater of claim 11, wherein: The sealing ring is a spring-accumulating sealing ring.

13. The regenerative air preheater of claim 1, wherein: The shrimp waist is a 180° elbow pipe.

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