Plate-type air preheater and flue gas heat energy recovery device with same

Abstract

The utility model provides a plate-type air preheater and a flue gas heat energy recovery device with the preheater, and relates to the technical field of air preheaters, the plate-type air preheater comprises an outer shell, a heat exchange assembly is arranged in the outer shell, a flue gas feeding pipe is arranged at the upper end of the outer shell, a flue gas outlet is arranged at the lower end of the outer shell, and an air outlet is arranged at the left end of the outer shell. An air inlet is formed in the right end of the outer shell. The waste heat in the flue gas is transmitted to the air, so that the temperature of the air entering the subsequent equipment is increased, the heat can be fully utilized in the combustion process and the like, the energy waste is reduced, and the heat efficiency of the whole system is improved. By recovering the heat of the flue gas, the temperature of the discharged flue gas is reduced, the loss of the heat taken away by the flue gas is reduced, and the heat pollution to the environment is also reduced to a certain extent. The flue gas waste heat is utilized to heat the air, so that the energy which is additionally consumed for heating the air is reduced, the recycling of the energy is realized, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model mainly relates to air preheater technical field, concretely relates to a plate type air preheater and the flue gas heat energy recovery device with the preheater. BACKGROUND

[0002] In industrial production, such as thermal power generation, metallurgy, chemical industry and other fields, often need to burn fuel to obtain energy, and a large amount of high-temperature flue gas will be produced in the combustion process. These high-temperature flue gas contains a large amount of waste heat, if directly discharged into the atmosphere, not only will cause the waste of energy, but also will cause thermal pollution to the environment.

[0003] Air preheater as a kind of equipment that can effectively recover flue gas waste heat, has been widely used in industrial production. Its main function is to use the heat of high-temperature flue gas to heat the air entering the combustion equipment, so as to improve the combustion efficiency and reduce energy consumption.

[0004] At present, the common air preheater on the market mainly has tube type, rotary type and other types. Although the structure of the tube type air preheater is relatively simple, the heat transfer efficiency is low, and the volume is large, the space is more occupied. Although the heat transfer efficiency of the rotary type air preheater is high, the structure is complex, there are problems such as air leakage, the maintenance cost is high, and the equipment is easy to appear ash accumulation, corrosion and other faults, which affects the normal operation and service life of the equipment.

[0005] In order to overcome the shortcomings of the existing air preheater, improve the heat transfer efficiency of the air preheater, reduce the equipment volume and maintenance cost, it has important practical significance to develop a new type of plate type air preheater. CONTENT OF THE UTILITY MODEL

[0006] 1. The technical problem to be solved by the utility model:

[0007] The utility model provides a plate type air preheater and the flue gas heat energy recovery device with the preheater, to solve the technical problems existing in the above background technology.

[0008] 2. Technical scheme:

[0009] In order to achieve the above purpose, the utility model provides a technical scheme: a plate type air preheater, comprising a shell, a heat exchange assembly is arranged in the shell, a flue gas inlet pipe is arranged at the upper end of the shell, a flue gas outlet is arranged at the lower end of the shell, an air outlet is arranged at the left end of the shell, and an air inlet is arranged at the right end of the shell.

[0010] Preferably, the inside of the outer shell is provided with a mounting cavity, the heat exchange assembly is arranged in the mounting cavity, and the left and right sides of the outer shell are provided with connecting ports, and the air inlet and the air outlet are respectively connected with one connecting port.

[0011] Preferably, the flue gas feeding pipe is provided with a flue gas flow cavity, a guide plate is arranged at the center of the flue gas flow cavity, and the two ends of the flue gas feeding pipe are respectively provided with a first flue gas inlet and a second flue gas inlet.

[0012] Preferably, the heat exchange assembly comprises a mounting bottom plate, a plurality of corrugated plates are arranged on the mounting bottom plate, the corrugated plates are arranged at equal distances, flue gas flow channels are arranged on the corrugated plates, the upper and lower ends of the flue gas flow channels are respectively connected with the flue gas feeding pipe and the flue gas outlet, air flow channels are formed between adjacent corrugated plates, and the left and right ends of the air flow channels are respectively connected with the air outlet and the air inlet.

[0013] Preferably, the upper end of the corrugated plate is provided with a sealing plate, the flue gas inlet of the flue gas flow channel is arranged above the sealing plate, the corrugated plate is inserted into the limiting plate, and the limiting plate is arranged at the lower end of the sealing plate.

[0014] A flue gas heat energy recovery device, characterized by comprising a cyclone separator, a plate-type air preheater, an induced draft fan and a blower, the cyclone separator is provided with a high-temperature flue gas inlet, an ash outlet and a high-temperature flue gas outlet, the high-temperature flue gas inlet of the cyclone separator is connected with a boiler exhaust port, the high-temperature flue gas outlet is connected with a flue gas feeding pipe of the plate-type air preheater, the outlet of the blower is connected with an air inlet of the plate-type air preheater, the air outlet of the plate-type air preheater is connected with an air inlet of the boiler, and the flue gas outlet of the plate-type air preheater is connected with the induced draft fan.

[0015] 3. Beneficial effects:

[0016] Compared with the prior art, the technical scheme has the following beneficial effects:

[0017] The utility model discloses a heat transfer device for flue gas and air, which comprises a shell, a flue gas feeding pipe, an air inlet, a heat exchange assembly and an air outlet.

[0018] The heat exchange assembly arranged in the mounting cavity of the shell body is composed of a plurality of corrugated plates, the plate type structure is relatively compact, a larger heat exchange area can be provided in limited space, space is effectively utilized, the corrugated plates are arranged at equal distances and the flow channel cross section shape is continuously changed, disturbance of the flowing medium is strengthened, compared with some other types of air preheaters, the heat transfer performance is increased. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a whole structure schematic view of the utility model;

[0020] Fig. 2 It is a whole structure schematic view of the utility model from another angle;

[0021] Fig. 3 It is a shell body structure schematic view of the utility model;

[0022] Fig. 4 It is a mounting cavity structure schematic view of the utility model;

[0023] Fig. 5 It is a heat exchange assembly structure schematic view of the utility model;

[0024] Fig. 6 It is a heat exchange assembly structure schematic view of the utility model from another angle;

[0025] Fig. 7 It is a flue gas feeding pipe structure schematic view of the utility model.

[0026] Reference signs:

[0027] 1, shell body; 11, mounting cavity; 12, connecting port; 2, flue gas feeding pipe; 21, first flue gas inlet; 22, second flue gas inlet; 23, flue gas flow-through cavity; 24, flow guide plate; 3, air inlet; 4, air outlet; 5, flue gas outlet; 6, heat exchange assembly; 61, mounting bottom plate; 62, limiting plate; 63, flue gas flow channel; 64, sealing plate; 65, flue gas inlet; 66, corrugated plate; 67, air flow channel. DETAILED DESCRIPTION

[0028] In order to facilitate understanding of the utility model, the utility model will be described more fully below with reference to the related drawings, wherein several embodiments of the utility model are given, however, the utility model can be realized in many different forms and is not limited to the embodiments described herein, on the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0029] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model indicated or implied by the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0030] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0031] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing", "provided with" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0032] It should be noted that the structures not introduced in the utility model are the same as or can be realized by using the prior art, which do not involve the design points and improvement direction of the utility model, and therefore will not be described here. Embodiment

[0033] Referring to the drawings Figs. 1-7 A plate type air preheater, comprising an outer shell 1, a heat exchange assembly 6 is arranged in the outer shell 1, the upper end of the outer shell 1 is provided with a flue gas feeding pipe 2, the lower end of the outer shell 1 is provided with a flue gas outlet 5, the left end of the outer shell 1 is provided with an air outlet 4, and the right end of the outer shell 1 is provided with an air inlet 3.

[0034] The inside of the outer shell 1 is provided with a mounting cavity 11, the heat exchange assembly 6 is arranged in the mounting cavity 11, and the left and right sides of the outer shell 1 are provided with connecting openings 12, and the air inlet 3 and the air outlet 4 are respectively connected with one connecting opening 12.

[0035] The flue gas flow passage 63 is connected with the flue gas inlet pipe 2 and the flue gas outlet 5.

[0036] The heat exchange assembly 6 comprises a mounting bottom plate 61, a plurality of corrugated plates 66 are arranged on the mounting bottom plate 61, the corrugated plates 66 are arranged at equal intervals, the flue gas flow passages 63 are arranged on the corrugated plates 66, the upper and lower ends of the flue gas flow passages 63 are connected with the flue gas inlet pipe 2 and the flue gas outlet 5 respectively, the air flow passages 67 are formed between adjacent corrugated plates 66, and the left and right ends of the air flow passages 67 are connected with the air outlet 4 and the air inlet 3 respectively.

[0037] The upper end of the corrugated plate 66 is provided with a sealing plate 64, the flue gas inlets 65 of the flue gas flow passages 63 are arranged above the sealing plate 64, the corrugated plate 66 is inserted into the limiting plate 62, and the limiting plate 62 is arranged at the lower end of the sealing plate 64. The corrugated plate 66 is usually made of metal materials such as stainless steel, has good corrosion resistance, has no obvious vortex under the plate structure, has small dust adhesion of the heat exchange surface, is not easy to accumulate dust, can keep stable performance for a long time, and reduces maintenance cost.

[0038] The flue gas heat energy recovery device comprises a cyclone separator, a plate-type air preheater, an induced draft fan and a blower, the cyclone separator has a high-temperature flue gas inlet, a dust outlet and a high-temperature flue gas outlet, the high-temperature flue gas inlet of the cyclone separator is connected with a boiler exhaust port, the high-temperature flue gas outlet is connected with a flue gas inlet pipe 2 of the plate-type air preheater, an outlet of the blower is connected with an air inlet 3 of the plate-type air preheater, an air outlet 4 of the plate-type air preheater is connected with an air inlet of the boiler, and a flue gas outlet 5 of the plate-type air preheater is connected with the induced draft fan.

[0039] Working principle:

[0040] The high-temperature flue gas discharged from the boiler first enters the cyclone separator, the cyclone separator separates solid particles (such as dust, fly ash and the like) carried in the high-temperature flue gas by the action of centrifugal force, the solid particles are discharged through the dust outlet, and the high-temperature flue gas subjected to preliminary purification flows out from the high-temperature flue gas outlet of the cyclone separator.

[0041] The high-temperature flue gas flowing out from the cyclone separator enters the flue gas inlet pipe 2 of the plate-type air preheater, in the flue gas inlet pipe 2, the flue gas is uniformly distributed under the action of the flow guide plate 24, and then enters the flue gas flow passages 63 of the heat exchange assembly 6. At the same time, the blower pressurizes the external air into the air inlet 3 of the plate-type air preheater, and the air enters the air flow passages 67 between adjacent corrugated plates 66. The high-temperature flue gas and the cold air exchange heat through the corrugated plates 66, so that the air temperature is increased and the flue gas temperature is decreased.

[0042] After heat exchange, the heated hot air flows out from the air outlet 4 of the plate air preheater, and is then transported to the air inlet of the boiler to enter the boiler to participate in the combustion process. The low-temperature flue gas with reduced temperature flows out from the flue gas outlet 5 of the plate air preheater, is sucked by the induced draft fan, and is finally discharged into the atmosphere or subjected to subsequent treatment.

[0043] The flue gas heat energy recovery device effectively recovers the waste heat in the high-temperature flue gas discharged from the boiler, and transfers the waste heat to the air entering the boiler, thereby increasing the temperature of the air, achieving the recycling of heat energy, and reducing the waste of energy. After the hot air enters the boiler, the combustion of the fuel can be more sufficient, the combustion efficiency is improved, the consumption of the fuel is reduced, and thus the production cost is reduced. The cyclone separator preliminarily purifies the high-temperature flue gas, removes most of the solid particles in the high-temperature flue gas, reduces the abrasion of subsequent equipment (such as the plate air preheater, the induced draft fan, etc.), prolongs the service life of the equipment, and simultaneously reduces the emission of atmospheric pollutants. The cooperation of the induced draft fan and the forced draft fan can balance the pressure in the system, ensure that the flue gas and the air flow along the predetermined path, and enable the whole system to stably operate.

[0044] The flue gas containing heat enters the flue gas flow passage 23 from the first flue gas inlet 21 and the second flue gas inlet 22 of the flue gas feeding pipe 2, and under the action of the guide plate 24, the flue gas can more uniformly enter the subsequent flow passage. The flue gas enters the flue gas flow passage 63 on the corrugated plate 66 in the heat exchange assembly 6, and at the same time, the external cold air enters the shell 1 from the air inlet 3, and enters the air flow passage 67 between the adjacent corrugated plates 66 through the connecting port 12.

[0045] The high-temperature flue gas in the flue gas flow passage 63 and the cold air in the air flow passage 67 exchange heat through the corrugated plate 66. Due to the special structure and large contact area of the corrugated plate 66, heat can be efficiently transferred from the flue gas to the air, so that the temperature of the air is increased and the temperature of the flue gas is reduced.

[0046] The low-temperature flue gas after heat exchange flows into the flue gas outlet 5 from the lower end of the flue gas flow passage 63, and is finally discharged from the air preheater; and the heated hot air flows out from the left end of the air flow passage 67, flows out from the air outlet 4 through the connecting port 12, and enters the equipment or system requiring hot air.

[0047] The above-described embodiments only express certain implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A plate air preheater comprising an outer housing (1), characterized in that: The outer shell (1) is provided with a heat exchange assembly (6), the upper end of the outer shell (1) is provided with a flue gas feeding pipe (2), the lower end of the outer shell (1) is provided with a flue gas outlet (5), the left end of the outer shell (1) is provided with an air outlet (4), and the right end of the outer shell (1) is provided with an air inlet (3).

2. A plate heat exchanger according to claim 1, characterized in that The inner part of the outer shell (1) is provided with a mounting cavity (11), the heat exchange assembly (6) is arranged in the mounting cavity (11), and the left and right sides of the outer shell (1) are provided with connecting openings (12), and the air inlet (3) and the air outlet (4) are respectively connected with one connecting opening (12).

3. A plate heat exchanger according to claim 1, characterized in that: The flue gas feeding pipe (2) is provided with a flue gas flow cavity (23), the center of the flue gas flow cavity (23) is provided with a guide plate (24), and the two ends of the flue gas feeding pipe (2) are respectively provided with a first flue gas inlet (21) and a second flue gas inlet (22).

4. A plate heat exchanger according to claim 1, characterized in that: The heat exchange assembly (6) comprises a mounting bottom plate (61), a plurality of corrugated plates (66) are arranged on the mounting bottom plate (61), the corrugated plates (66) are arranged at equal distances, flue gas flow channels (63) are arranged on the corrugated plates (66), the upper and lower ends of the flue gas flow channels (63) are respectively connected with the flue gas feeding pipe (2) and the flue gas outlet (5), air flow channels (67) are formed between adjacent corrugated plates (66), and the left and right ends of the air flow channels (67) are respectively connected with the air outlet (4) and the air inlet (3).

5. A plate heat exchanger according to claim 4, characterized in that: The upper end of the corrugated plate (66) is provided with a sealing plate (64), the flue gas inlet (65) of the flue gas flow channel (63) is arranged above the sealing plate (64), the corrugated plate (66) is inserted into the limiting plate (62), and the limiting plate (62) is arranged at the lower end of the sealing plate (64).

6. A flue gas heat recovery device having a plate air preheater according to any one of claims 1 to 5, characterized in that: The application relates to a flue gas heat exchange device, which comprises a cyclone separator, a plate-type air preheater, an induced draft fan and a blower, the cyclone separator is provided with a high-temperature flue gas inlet, a dust outlet and a high-temperature flue gas outlet, the high-temperature flue gas inlet of the cyclone separator is connected with a boiler exhaust outlet, the high-temperature flue gas outlet is connected with a flue gas feeding pipe (2) of the plate-type air preheater, the outlet of the blower is connected with an air inlet (3) of the plate-type air preheater, an air outlet (4) of the plate-type air preheater is connected with an air inlet of the boiler, and a flue gas outlet (5) of the plate-type air preheater is connected with the induced draft fan.

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