Boiler flue gas waste heat recovery device

Abstract

The utility model discloses a boiler flue gas waste heat recovery device, and relates to the technical field of waste heat recovery. Comprising a fixing pipe, a first fixing cover and a second fixing cover are arranged at the two ends of the fixing pipe respectively, an air inlet pipe is arranged on the outer side of the second fixing cover, and the air inlet pipe is communicated with the second fixing cover; and the second heat absorption assembly is arranged in the fixed pipe and used for absorbing the temperature of the flue gas, the second heat absorption assembly comprises a heat absorption piece and a guide piece, the guide piece is arranged in the fixed pipe, and the heat absorption piece is arranged in the guide piece. Through the arrangement of the fixing pipe, the first fixing cover, the second fixing cover and the second heat absorption assembly, the fixing pipe, the first fixing cover, the second fixing cover, a heat absorption pipe, a connecting pipe, a second water inlet pipe, a second water outlet pipe and a guide plate are matched, and therefore smoke waste heat is fully absorbed; and heat flue gas is prevented from being directly discharged to the outside, so that a large amount of thermal resources are prevented from being wasted.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, and particularly relates to a waste heat recovery device for boiler flue gas. Background Art

[0002] The circulating fluidized bed boiler adopts the clean coal combustion technology with the highest industrialization degree. The circulating fluidized bed boiler adopts fluidized combustion, and its main structure includes two major parts: a combustion chamber and a circulating return furnace. The biggest difference from the bubbling fluidized bed combustion technology is the high operating wind speed, which strengthens the heterogeneous reaction processes such as combustion and desulfurization. The boiler capacity can be expanded to a large capacity acceptable to the power industry.

[0003] When a traditional circulating fluidized bed boiler is in use, after the tail gas is heat-exchanged by an economizer and an air preheater, the temperature is still 130 - 150 °C, and then the flue gas is directly discharged to the outside after passing through a dust collector, thus causing a large amount of thermal resources to be wasted and increasing the production cost. For this reason, a waste heat recovery device for boiler flue gas is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to solve the problem that after the tail gas is heat-exchanged by an economizer and an air preheater, the temperature is still 130 - 150 °C, and then the flue gas is directly discharged to the outside after passing through a dust collector, thus causing a large amount of thermal resources to be wasted and increasing the production cost. The utility model provides a waste heat recovery device for boiler flue gas.

[0005] The utility model specifically adopts the following technical solutions to achieve the above purpose:

[0006] A waste heat recovery device for boiler flue gas, comprising:

[0007] A fixed pipe, with a first fixed cover and a second fixed cover respectively provided at both ends of the fixed pipe. An air inlet pipe is provided outside the second fixed cover, and the air inlet pipe is communicated with the second fixed cover;

[0008] A second heat absorption assembly, arranged inside the fixed pipe and used for absorbing the temperature of the flue gas. The second heat absorption assembly includes a heat absorption member and a guiding member. The guiding member is arranged inside the fixed pipe, and the heat absorption member is arranged inside the guiding member, and the guiding member increases the contact time between the flue gas and the heat absorption member.

[0009] Further, a baffle is also provided inside the second fixed cover, and the baffle is inclined. A first heat absorption assembly for increasing the contact area with the flue gas is also provided inside the fixed pipe.

[0010] Further, the guiding member includes a guiding plate, the guiding plate is spiral, the guiding plate is connected to the fixed pipe, and the guiding plate spirally extends along the height direction of the fixed pipe.

[0011] Further, the heat absorber includes a plurality of heat absorption tubes, which are connected to the guiding plate. Connecting pipes are provided at both ends of the plurality of heat absorption tubes, and a second water inlet pipe and a second water outlet pipe are respectively provided outside the connecting pipes.

[0012] Further, the first heat absorption assembly includes a heat absorption plate, which is arranged inside the fixed pipe. A coil pipe is arranged inside the heat absorption plate, and a first water inlet pipe and a first water outlet pipe are respectively arranged at both ends of the coil pipe.

[0013] Further, a plurality of grooves are also formed on the inner wall of the heat absorption plate.

[0014] The beneficial effects of the present utility model are as follows:

[0015] Through the arrangement of the fixed pipe, the first fixing cover, the second fixing cover and the second heat absorption assembly, the present utility model realizes the cooperation of the fixed pipe, the first fixing cover, the second fixing cover, the heat absorption tube, the connecting pipe, the second water inlet pipe, the second water outlet pipe and the guiding plate, so as to fully absorb the waste heat of the flue gas, and avoid the direct discharge of the flue gas with remaining heat to the outside, thus causing a large amount of thermal resources to be wasted.

[0016] Through the arrangement of the fixed pipe and the first heat absorption assembly, the present utility model realizes the cooperation of the fixed pipe, the first water inlet pipe, the first water outlet pipe, the heat absorption plate, the coil pipe and the guiding plate, so as to increase the contact area with the flue gas and further improve the efficiency of waste heat recovery of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 is a main sectional view of the present utility model;

[0019] Figure 3 is an enlarged view of the second heat absorption assembly of the present utility model;

[0020] Figure 4 is a main sectional view of the first heat absorption assembly of the present utility model;

[0021] Figure 5 is an enlarged view of the fixed pipe of the present utility model;

[0022] Figure 6 is an enlarged view of the first heat absorption assembly of the present utility model;

[0023] Reference numerals: 1, fixed pipe; 101, first fixed cover; 102, second fixed cover; 103, intake pipe; 104, baffle; 2, first heat absorption assembly; 201, first water inlet pipe; 202, first water outlet pipe; 203, heat absorption plate; 204, coil pipe; 3, second heat absorption assembly; 301, heat absorption pipe; 302, connecting pipe; 303, second water inlet pipe; 304, second water outlet pipe; 305, guiding plate. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0026] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0027] The electrical components appearing in this article are all electrically connected to an external main controller and 220V mains power, and the main controller can be a conventional known device such as a computer for control.

[0028] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.

[0029] Such as Figures 1 to 6As shown in the figure, a boiler flue gas waste heat recovery device includes: a fixed pipe 1, with a first fixed cover 101 and a second fixed cover 102 provided at both ends of the fixed pipe 1 respectively. An air inlet pipe 103 is provided outside the second fixed cover 102, and the air inlet pipe 103 is communicated with the second fixed cover 102. A second heat absorption component 3 is arranged inside the fixed pipe 1 for absorbing the temperature of the flue gas. The second heat absorption component 3 includes a heat absorption element and a guiding element. The guiding element is arranged inside the fixed pipe 1, and the heat absorption element is arranged inside the guiding element. The guiding element increases the contact time between the flue gas and the heat absorption element. Specifically, when absorbing the waste heat of the flue gas, first, the flue gas is guided through the cooperation of the fixed pipe 1, the first fixed cover 101 and the second fixed cover 102. Then, the waste heat in the flue gas is absorbed by the heat absorption element. During the process of absorbing the waste heat, the guiding element increases the residence time of the flue gas inside the fixed pipe 1, thereby improving the effect of absorbing the waste heat of the flue gas. The air inlet pipe 103 can guide the flue gas discharged from the boiler, so that the flue gas can enter the inside of the second fixed cover 102.

[0030] As Figures 1 to 6 shown in the figure, a baffle 104 is further provided inside the second fixed cover 102, and the baffle 104 is inclined. A first heat absorption component 2 for increasing the contact area with the flue gas is also provided inside the fixed pipe 1. Specifically, the baffle 104 is arranged directly above the air inlet pipe 103, blocking the flue gas while the flue gas enters the inside of the second fixed cover 102, so that the flue gas can turn back inside the second fixed cover 102, thereby separating the fine particles in the flue gas from the flue gas, reducing the adhesion of the fine particles in the flue gas to the surface of the heat absorption element during use, and ensuring the efficiency during the heat absorption process. The second fixed cover 102 can centrally collect the separated fine particles. The first fixed cover 101, the second fixed cover 102 and the fixed pipe 1 can be connected by bolts or buckles, which is convenient for quickly cleaning the fine particles on the surface of the heat absorption element during long-term use.

[0031] As Figures 1 to 6 shown in the figure, the guiding element includes a guiding plate 305. The guiding plate 305 is spiral, and the guiding plate 305 is connected to the fixed pipe 1 and spirally extends along the height direction of the fixed pipe 1. Specifically, the guiding plate 305 can guide the flue gas, preventing the flue gas from directly passing through the fixed pipe 1 during waste heat absorption, thereby increasing the residence time of the flue gas inside the fixed pipe 1. The number of the guiding plates 305 can be selected according to actual needs to separate the flue gas and increase the contact area between the flue gas and the heat exchange element, ensuring the absorption efficiency of the waste heat of the flue gas.

[0032] As Figures 1 to 6As shown, the heat absorber includes a plurality of heat absorption tubes 301. The heat absorption tubes 301 are connected to the guiding plate 305. Connection tubes 302 are provided at both ends of the plurality of heat absorption tubes 301. A second water inlet pipe 303 and a second water outlet pipe 304 are respectively provided outside the connection tubes 302. Specifically, the second water inlet pipe 303 is connected to a water pump or a water delivery pipe, and the second water outlet pipe 304 is connected to a water storage tank or a water tank. The heat absorption tubes 301 can be in a serpentine tube shape or a spiral tube shape, so as to increase the contact area with the flue gas and ensure the absorption effect of the waste heat of the flue gas during use. Both the heat absorption tubes 301 and the guiding plate 305 are made of materials with good thermal conductivity to ensure that the temperature can be quickly absorbed during use. The connection tubes 302 communicate the two ends of the plurality of heat absorption tubes 301, enabling the liquid to flow inside the heat absorption tubes 301 driven by the second water inlet pipe 303 and the second water outlet pipe 304.

[0033] As Figures 1 to 6 shown, the first heat absorption assembly 2 includes a heat absorption plate 203. The heat absorption plate 203 is arranged inside the fixed tube 1. A coil pipe 204 is provided inside the heat absorption plate 203. A first water inlet pipe 201 and a first water outlet pipe 202 are respectively provided at both ends of the coil pipe 204. Specifically, both the heat absorption plate 203 and the coil pipe 204 are made of materials with good heat transfer, and both the heat absorption plate 203 and the coil pipe 204 are in direct contact with the flue gas, so as to absorb the waste heat in the flue gas. The heat absorption plate 203 can absorb the heat in the flue gas to heat the coil pipe 204. The heat absorption plate 203 cooperates with the coil pipe 204 to block the flue gas and the fixed tube 1, and a heat insulation material is filled between the heat absorption plate 203 and the fixed tube 1 to prevent the waste heat of the flue gas from radiating outward through the fixed tube 1 during use while increasing the waste heat absorption effect. The coil pipe 204 can be in a spiral shape or a serpentine tube shape, so as to increase the contact area between the coil pipe 204 and the flue gas and ensure the absorption effect of the waste heat of the flue gas.

[0034] As Figures 1 to 6 shown, a groove is further formed on the inner wall of the heat absorption plate 203, and there are a plurality of grooves. Specifically, during the flow of the flue gas, the contact area between the flue gas and the heat absorption plate 203 is increased through the grooves, further improving the absorption effect of the waste heat of the flue gas.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A boiler flue gas waste heat recovery device, characterized in that: include: A fixed pipe (1), wherein two ends of the fixed pipe (1) are respectively provided with a first fixed cover (101) and a second fixed cover (102), an air intake pipe (103) is provided outside the second fixed cover (102), and the air intake pipe (103) is communicated with the second fixed cover (102); The second heat absorbing component (3) is arranged inside the fixed tube (1) and is used to absorb the temperature of the smoke. The second heat absorbing component (3) comprises a heat absorbing element and a guide element. The guide element is arranged inside the fixed tube (1). The heat absorbing element is arranged inside the guide element, and the guide element increases the contact time between the smoke and the heat absorbing element.

2. A boiler flue gas waste heat recovery device according to claim 1, characterized in that: A baffle (104) is also provided inside the second fixed cover (102), and the baffle (104) is inclined. A first heat absorption component (2) for increasing the contact area with the smoke is also provided inside the fixed pipe (1).

3. A boiler flue gas waste heat recovery device according to claim 2, characterized in that: The guide member comprises a guide plate (305), the guide plate (305) is spiral-shaped, the guide plate (305) is connected to the fixed pipe (1), and the guide plate (305) extends spirally along the height direction of the fixed pipe (1).

4. A boiler flue gas waste heat recovery device according to claim 3, characterized in that: The heat absorbing component comprises a plurality of heat absorbing tubes (301), wherein the heat absorbing tubes (301) are connected to a guide plate (305), and connecting tubes (302) are provided at both ends of the plurality of heat absorbing tubes (301), and a second water inlet pipe (303) and a second water outlet pipe (304) are respectively provided on the outside of the connecting tubes (302).

5. The boiler flue gas waste heat recovery device according to claim 2, characterized in that: The first heat absorbing component (2) comprises a heat absorbing plate (203), the heat absorbing plate (203) being arranged inside the fixed tube (1), a coil (204) being arranged inside the heat absorbing plate (203), and a first water inlet pipe (201) and a first water outlet pipe (202) being arranged at both ends of the coil (204).

6. A boiler flue gas waste heat recovery device according to claim 5, characterized in that: The inner wall of the heat absorbing plate (203) is also provided with a plurality of grooves.

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