Flue gas heat exchange structure for coal-fired boiler

Abstract

The smoke heat exchange structure for the coal-fired boiler is characterized by comprising a boiler body, a smoke outlet pipe, a filter box, a filter assembly, a cleaning cover, a heat exchange water tank, a coiled pipe, a smoke exhaust pipe and a heat conduction block, a smoke outlet of the boiler body is connected with the filter box through the smoke outlet pipe, and the filter assembly is installed in the filter box; a cleaning cover is fixedly arranged at the position, provided with a cleaning opening, of the filter box through bolts, a smoke outlet of the filter box is connected with one end of a coiled pipe, the coiled pipe is installed in the heat exchange water tank, and the other end of the coiled pipe is installed from an installation opening formed in the heat exchange water tank and extends out to be connected with a smoke exhaust pipe. A plurality of heat conduction blocks are arranged on the outer wall of the coiled pipe, filtered flue gas enters the heat exchange water tank, the contact area of the coiled pipe and water in the water tank is increased, the heat conduction blocks are arranged, the heat exchange effect of heat in the flue gas is improved, the heated water is used for other production links, and the heat energy utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas heat exchange equipment for coal-fired boilers, in particular to a flue gas heat exchange structure for coal-fired boilers. Background Art

[0002] A boiler is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into hot water or base steam. The boiler consists of two major parts: the pot and the furnace. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives, or can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator. A boiler that provides hot water is called a hot water boiler, which is mainly used for life and also has a small number of applications in industrial production. A boiler that generates steam is called a steam boiler, often referred to as a boiler, and is mostly used in thermal power plants, ships, locomotives, and industrial and mining enterprises.

[0003] Traditional fuel boilers emit a large amount of flue gas when in use. The temperature of the flue gas is still high when it is discharged. However, the high-temperature flue gas is often discharged directly, which wastes the thermal energy of the boiler. Therefore, a flue gas heat exchange structure for coal-fired boilers is proposed to solve the above problem. Utility Model Content

[0004] In view of the above existing technical problems, the utility model provides a flue gas heat exchange structure for a coal-fired boiler, characterized in that it includes a boiler body, a smoke outlet pipe, a filter box, a filter assembly, a cleaning cover, a heat exchange water tank, a serpentine pipe, a smoke exhaust pipe, and a heat conduction block. The smoke outlet of the boiler body is connected to the filter box through the smoke outlet pipe, the filter assembly is installed in the filter box, the cleaning port is provided on the filter box and a cleaning cover is fixed by bolts, the smoke outlet of the filter box is connected to one end of the serpentine pipe, the serpentine pipe is installed in the heat exchange water tank, the other end of the serpentine pipe is installed from the installation port provided on the heat exchange water tank and extends out to be connected to the smoke exhaust pipe, and a plurality of heat conduction blocks are provided on the outer wall of the serpentine pipe.

[0005] The filter assembly is composed of a fixing plate, a filter screen plate, fixing bolts and a clamping plate. The fixing plate is installed in a mounting groove provided on the filter box through fixing bolts. The fixing plate is connected to the upper end of the filter screen plate. The lower end of the filter screen plate is clamped in a clamping groove provided on the clamping plate. The clamping plate is fixedly connected to the inner wall of the bottom surface of the filter box.

[0006] The fixing plate is arranged in a T-shaped structure.

[0007] Specifically, the raised ring arranged on the cleaning cover is inserted into a groove arranged on the filter box at the outer edge of the cleaning port, and the auxiliary cleaning cover is connected to the filter box.

[0008] Specifically, the water exchange tank is provided with a water inlet and a water outlet.

[0009] Beneficial effects of the utility model:

[0010] The utility model first transports the flue gas generated after the operation of the boiler body to the filter box, and filters out solid particles such as smoke and dust in the flue gas through the filter screen, thereby reducing the direct transportation of the flue gas to the serpentine pipe, avoiding the accumulation of a large amount of particles on the inner wall of the serpentine pipe due to long-term use, and prolonging the service life of the serpentine pipe;

[0011] The filter screen plate designed by the utility model is installed in the filter box through a fixing plate, fixing bolts and a clamping plate, so that the filter screen plate can be disassembled regularly for cleaning or replacement; a cleaning port is provided on the filter box to facilitate cleaning of the particles accumulated inside the filter box;

[0012] The filtered flue gas enters the water exchange tank. The serpentine tube increases the contact area between the flue gas and the water in the water tank. Several heat conducting blocks are arranged on the outer wall of the serpentine tube to increase the heat exchange effect of the flue gas and heat the water in the water tank. The heated water is used in other production links to improve the utilization rate of thermal energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the flue gas heat exchange structure for a coal-fired boiler of the utility model;

[0014] Figure 2 It is a schematic diagram of the internal structure of the filter box of the smoke heat exchange structure for a coal-fired boiler of the utility model;

[0015] Figure 3 It is a structural schematic diagram of the cleaning cover of the filter box of the smoke heat exchange structure for a coal-fired boiler of the utility model;

[0016] As shown in the figure: 1. Boiler body, 11. Smoke outlet pipe, 2. Filter box, 31. Fixing plate, 32. Fixing bolts, 33. Filter screen, 34. Clamping plate, 4. Cleaning cover, 41. Raised ring, 5. Heat exchange water tank, 6. Serpentine pipe, 61. Heat transfer block, 7. Smoke exhaust pipe. DETAILED DESCRIPTION

[0017] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] Example 1

[0021] As shown in the figure, the smoke outlet of the boiler body 1 is connected to the filter box 2 through the smoke outlet pipe 11, and the filter box 2 is provided with a filter assembly, such as Figure 3 The fixing plate 31 in the filter assembly is fixedly connected to the installation groove set on the filter box 2 by fixing bolts 32. The fixing plate 31 is set to a T-shaped structure. The fixing plate 31 is connected to the upper end of the filter screen plate 33. The lower end of the filter screen plate 33 is clamped in the clamping groove set on the clamping plate 34. The clamping plate 34 is fixedly connected to the inner wall of the bottom surface of the filter box 2. The cleaning port is set on the filter box 2 and fixed with a cleaning cover 4 by bolts. The raised ring 41 set on the cleaning cover 4 is inserted into the groove set on the outer edge of the cleaning port on the filter box 2 to assist the installation of the cleaning cover 4.

[0022] The smoke outlet of the filter box 2 is connected to one end of the serpentine tube 6, and the serpentine tube 6 is installed in the heat exchange water tank 5. The other end of the serpentine tube 6 is installed from the installation port set on the heat exchange water tank 5 and extends out to be connected to the smoke exhaust pipe 7. A plurality of heat conduction blocks 61 are arranged on the outer wall of the serpentine tube 6, wherein the heat exchange water tank 5 is provided with a water inlet 52 and a water outlet 51.

[0023] Example 2

[0024] When the utility model is used, the smoke generated after the operation of the boiler body 1 is transported to the filter box 2 through the smoke outlet pipe 11, and the solid particles such as smoke dust in the smoke are filtered out through the filter screen 33, which reduces the smoke directly transported to the serpentine pipe 6, avoids the accumulation of a large amount of particles on the inner wall of the serpentine pipe 6 due to long-term use, and improves the service life of the serpentine pipe 6;

[0025] The filter box 2 is provided with a cleaning port, and the particles accumulated inside the filter box 2 can be cleaned by removing the cleaning cover 4, and the filter screen 33 is installed in the filter box 2 through the fixing plate 31, the fixing bolts 32 and the clamping plate 34, so that the filter screen 33 can be removed and taken out regularly for cleaning or replacement;

[0026] The filtered flue gas enters the water exchange tank 5, and the flue gas passes into the serpentine tube 6 to exchange heat with the water in the water tank. The serpentine tube 5 increases the contact area with the water in the water tank to improve the heat exchange filter, and a plurality of heat conducting blocks 61 are added to the outer wall of the serpentine tube 6. The heat conducting blocks 61 conduct the heat in the flue gas and exchange heat with the water in the water tank, thereby increasing the heat exchange effect of the heat in the flue gas and making full use of the heat in the flue gas. The flue gas heats the water in the water tank, and the heated water is used for other production links, thereby improving the utilization rate of thermal energy.

[0027] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The various components mentioned in the utility model are common technologies in the existing field. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. Flue gas heat exchange structure for coal-fired boiler, characterized in that It includes a boiler body, a smoke outlet pipe, a filter box, a filter assembly, a cleaning cover, a heat exchange water tank, a serpentine pipe, a smoke exhaust pipe, and a heat conduction block. The smoke outlet of the boiler body is connected to the filter box through the smoke outlet pipe, the filter assembly is installed in the filter box, a cleaning cover is fixed by bolts at a cleaning outlet provided on the filter box, the smoke outlet of the filter box is connected to one end of the serpentine pipe, the serpentine pipe is installed in the heat exchange water tank, the other end of the serpentine pipe is installed from the installation outlet provided on the heat exchange water tank and extends out to be connected to the smoke exhaust pipe, and a plurality of heat conduction blocks are provided on the outer wall of the serpentine pipe.

2. The flue gas heat exchange structure for a coal-fired boiler according to claim 1, characterized in that The filter assembly consists of a fixing plate, a filter screen plate, fixing bolts and a clamping plate. The fixing plate is installed in a mounting groove provided on the filter box through fixing bolts. The fixing plate is connected to the upper end of the filter screen plate. The lower end of the filter screen plate is clamped in a clamping groove provided on the clamping plate. The clamping plate is fixedly connected to the inner wall of the bottom surface of the filter box.

3. The flue gas heat exchange structure for a coal-fired boiler according to claim 2, characterized in that The fixing plate is arranged in a T-shaped structure.

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