Hazardous waste incineration waste heat boiler with internal hanging screen

Abstract

The utility model discloses a hazardous waste incineration waste heat boiler with an internal hanging screen. The hazardous waste incineration waste heat boiler comprises a steel frame, a boiler barrel and a boiler body. The boiler body comprises a hearth, and partition walls are arranged in the hearth to divide the hearth into a plurality of cavities which are sequentially communicated in the smoke flowing direction. In the chambers, the chamber communicated with the flue gas inlet of the hearth is a first chamber, and the chamber communicated with the flue gas outlet of the hearth is a second chamber; a hanging screen heating assembly is arranged in the second cavity; the hanging screen heating assembly is a plurality of groups of heating surfaces formed by an upper header, a lower header and a membrane wall, and the distance between the heating surfaces of the hanging screen heating assembly is not less than 800mm; the hanging screen heating assembly is hung in the steel frame through the hanging assembly, and meanwhile shock wave ash removal devices are arranged between the heating surfaces of the hanging screen heating assembly in the height direction. Therefore, according to the hazardous waste incineration waste heat boiler, the requirement for the heating area is met, the height and the occupied area of the hazardous waste incineration waste heat boiler are reduced, and the equipment cost and the site utilization rate are effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat boilers, and in particular relates to a hazardous waste incineration waste heat boiler with an internal hanging screen. Background Art

[0002] A hazardous waste incineration waste heat boiler refers to a boiler that generates high-temperature flue gas by incinerating wastes with hazardous characteristics (wastes listed in the national hazardous waste list and wastes identified in accordance with national hazardous waste identification standards and identification methods) and utilizes the sensible heat of the high-temperature flue gas.

[0003] Due to the complexity of the types of hazardous waste and incineration, the flue gas entering the waste heat boiler has complex and diverse flue gas components, including corrosive gases such as HCl, SO2, HF, and easy ash accumulation and slagging. At the same time, according to environmental protection and process requirements, the inlet temperature of this waste heat boiler is not less than 1100℃, and the outlet temperature is 500℃-550℃. Therefore, in order to prevent ash accumulation and facilitate ash cleaning, the waste heat boiler for hazardous waste incineration does not arrange a convection heating surface, and the membrane wall cavity structure is adopted as a whole. In the treatment process of the hazardous waste incineration system, the waste heat boiler is preceded by the incineration system (rotary kiln, secondary combustion chamber), and the flue gas purification treatment system is followed. The interface with the flue gas of the waste heat boiler is usually at the top, so the waste heat boiler structure uses a membrane wall as the front wall, rear wall, left and right side walls and top wall of the waste heat boiler to form 2 channels or 4 channels, so that the flue gas passes inside for radiation heat exchange.

[0004] With the increase in the scale of hazardous waste incineration production lines, the processing capacity of a single unit has increased from the previous 15 tons / day to the current 100 to 200 tons / day. Therefore, the current design of hazardous waste incineration waste heat boilers meets the heat exchange requirements by increasing the boiler height, width and flue flow. This results in a large boiler, limited use of cleaning equipment, an increased number of cleaning equipment, increased difficulty in cleaning, and an increase in floor space, which is not economically feasible. Utility Model Content

[0005] Based on the problems existing in the prior art, the utility model proposes a hazardous waste incineration waste heat boiler with an internal hanging screen, which solves the technical problems of reducing the bulky boiler, low cleaning efficiency of the cleaning equipment, and increased floor space.

[0006] In order to achieve the above technical objectives, the utility model will adopt the following technical solutions:

[0007] A waste heat boiler for incineration of hazardous waste with an internal screen, comprising a steel frame, a boiler drum installed above the steel frame and a boiler body suspended by the steel frame; the boiler body comprises a furnace, which is divided into a plurality of chambers connected in sequence along the direction of flue gas flow by setting partition walls; among the chambers, the first chamber is connected to the flue gas inlet of the furnace, and the second chamber is connected to the flue gas outlet of the furnace; a screen-mounted heating component is arranged in the second chamber; the screen-mounted heating component is a plurality of groups of heating surfaces composed of upper and lower headers and membrane walls, and the spacing between the heating surfaces of the screen-mounted heating component is not less than 800 mm; the screen-mounted heating component is suspended in the steel frame by a hanging component, and a shock wave cleaning device is arranged along the height direction between the heating surfaces of the screen-mounted heating component.

[0008] Preferably, the furnace is formed into a two-channel or four-channel structure by arranging partition walls; the smoke inlet and the smoke outlet of the furnace are both arranged close to the upper part of the furnace.

[0009] Preferably, the first chamber is a cavity structure formed by a partition wall, a front wall, a top wall and two side walls, and has a smoke turning outlet at the bottom; the second chamber is a cavity structure formed by a partition wall, a rear wall, a top wall and two side walls, and has a smoke turning inlet at the bottom.

[0010] Preferably, the furnace is sealed and connected with an ash hopper at the lower part of the first chamber and the second chamber, and an ash conveying device is arranged at the lower part of the ash hopper.

[0011] Preferably, the steel frame is a closed frame composed of a plurality of columns and beams connected together.

[0012] Preferably, both ends of the hanging screen heating assembly are connected to the partition wall and the rear wall through connecting pieces using fastening bolts.

[0013] Based on the above technical objectives, compared with the prior art, the utility model has the following advantages:

[0014] (1) The utility model arranges the heating area in the second chamber by means of hanging screens, which not only meets the need for the heating area, but also reduces the height and floor space of the waste heat boiler for hazardous waste incineration, effectively saving equipment costs and site utilization. At the same time, the large-spacing hanging screens will not block the boiler flue, and the hanging screen partitioning is conducive to the shock wave cleaning device to enhance the soot blowing effect in a small area.

[0015] (2) Control the reasonable screen spacing to prevent dust accumulation and facilitate maintenance and repair.

[0016] (3) The utility model changes the arrangement of the second chamber or the tail shock wave cleaning method, arranges the shock wave device in a relatively small space, increases the cleaning capacity, and is beneficial to the tail cleaning.

[0017] (4) The utility model adopts a detachable hanging screen structure to facilitate the adjustment of the heating surface, ensuring that the tail exhaust temperature meets environmental protection requirements and does not exceed 500°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view schematic diagram of the hazardous waste incineration waste heat boiler with internal hanging screen described in the utility model.

[0019] Figure 2 It is a side view schematic diagram of the hazardous waste incineration waste heat boiler with internal hanging screen described in the utility model.

[0020] Figure 3 This is a schematic diagram of the connection between the hanging screen heating component and the partition wall and the rear wall described in the utility model.

[0021] In the figure: 1. boiler drum; 2. steel frame; 3. hanging screen heating component; 4. first chamber; 5. second chamber; 6. flue gas inlet; 7. flue gas outlet; 8. flue gas turning mouth; 9. ash hopper; 10. shock wave cleaning device; 11. connecting piece; 12. hanging component; 13. front wall; 14. left and right side walls of the first chamber; 15. partition wall; 16. top wall of the first chamber; 17. left and right side walls of the second chamber; 18. top wall of the second chamber; 19. rear wall; 20. inspection manhole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means any limitation to the utility model and its application or use. Based on the embodiments in 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. Unless otherwise specified, the relative arrangement, expressions and numerical values ​​of the components and steps described in these embodiments do not limit the scope of the utility model. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0023] This embodiment provides a waste heat boiler for incineration of hazardous waste with an internal screen, including a flue, wherein a screen heating component is arranged inside the flue, and the operating temperature of the screen heating component is 800℃-550℃. The high-temperature flue gas enters the first chamber of the flue through the flue gas inlet, and enters the second chamber through the flue gas turning port after cooling. The screen heating component is installed in the second chamber, and the high-temperature flue gas passes through several narrow channels separated by the screen heating component to implement effective heat exchange; the cooled flue gas enters the subsequent process through the flue gas outlet.

[0024] Furthermore, the waste heat boiler as a whole adopts a suspension structure, which is suspended on the steel frame through a hanging assembly, and the steam drum is placed on the top of the steel frame. The waste heat boiler as a whole adopts a two-pass and four-pass structure, and the hanging screen heating assembly is arranged in the last chamber. The inlet temperature of the waste heat boiler is about 1100℃, and the outlet temperature is 500℃-550℃. A shock wave cleaning device is arranged along the height direction between the hanging screen heating assemblies to effectively clean the ash, and the smoke falls to the ash hopper by gravity, ensuring the long-term stable operation of the waste heat boiler. Preferably, the spacing between the hanging screens is not less than 800mm, and a maintenance manhole is arranged at the same time to facilitate the shutdown personnel to have sufficient maintenance space.

[0025] The installation form of the hanging screen heating component is to connect the connecting parts with the partition wall and the rear wall by bolts. Preferably, the connecting parts are made of 347H material to prevent high temperature corrosion.

[0026] Furthermore, the hanging screen heating components can be disassembled through connectors, and the number of hanging screens can be increased or decreased when the exhaust temperature is too high or too low. Preferably, a steam-water connection interface is reserved in advance on the boiler drum, and a position for hanging components is also reserved on the steel frame.

[0027] See also Figures 1 to 3 As shown, the hazardous waste heat boiler with an internal hanging screen of the utility model is further explained and illustrated.

[0028] like Figure 1 As shown, a hazardous waste heat boiler with an internal hanging screen includes a first chamber 4 and a second chamber 5, and more chambers can be provided. In this embodiment, two return chambers are provided. The first chamber 4 is connected to the flue gas inlet 6, and the second chamber 5 is connected to the flue gas outlet 7. The ash hopper 9 is connected to the lower part of the first chamber 4 and the second chamber 5. The boiler drum 1 is placed on the steel frame 2, and the rest are suspended in the steel frame 2 through the hanging assembly 12. A hanging screen heating assembly 3 is provided in the second chamber 5 at the lower part of the boiler, which can increase the radiation heating surface in a fixed area and height to meet the heat exchange requirements.

[0029] like Figure 1 As shown, the first chamber 4 is surrounded by a front wall 13, left and right side walls 14 of the first chamber, a partition wall 15, and a top wall 16 of the first chamber; the second chamber 5 is surrounded by left and right side walls 17 of the second chamber, a top wall 18 of the second chamber, and a rear wall 19.

[0030] like Figure 2 As shown, the hanging screen heating component 3 is suspended on the steel frame 2 by a hanging component 12. Furthermore, the shock wave cleaning device is arranged between the hanging screens along the height direction 10 to effectively clean the dust. The smoke falls to the ash hopper 9 by gravity, ensuring the long-term stable operation of the waste heat boiler. Preferably, the pitch between the hanging screens is not less than 800 mm, and the inspection manholes 20 are evenly arranged in the height direction to facilitate shutdown and maintenance.

[0031] like Figure 3 As shown, the screen-hanging heating assembly 3 is bolted to the partition wall 15 and the rear wall 19 through the connecting piece 11, and can be easily disassembled. Preferably, the connecting piece 11 and the bolt are made of 347H material.

[0032] Furthermore, the hanging screen heating component 3 can be disassembled through the connecting piece 11, and the number of hanging screens can be increased or decreased when the exhaust gas temperature is too high or too low. Preferably, the drum 1 has a steam-water connection interface reserved in advance, and the steel frame 2 also has a reserved position for the hanging component 12.

[0033] This device is used for the flue gas treatment system after the incinerator of hazardous waste, solid waste, garbage, medical waste, etc. It can reduce the floor space and height of such waste heat boilers and reduce investment costs; it is difficult to clean the dusty flue gas.

[0034] The working principle of the utility model is as follows: 1100℃ high-temperature flue gas enters the first chamber 4 of the waste heat boiler through the flue gas inlet 6, and the flue gas is cooled to about 700℃ after passing through the first chamber 4 of the waste heat boiler; after cooling, the high-temperature flue gas enters the second chamber 5 area, and a hanging screen heating component 3 is installed in the second chamber 5 of the waste heat boiler. When the high-temperature flue gas passes through the hanging screen heating component 3, the high-temperature flue gas enters the flue gas outlet 7 after further heat exchange, ensuring that the temperature of the flue gas outlet 7 is 550-500℃, and the steam-water mixture generated by the entire heat exchange is separated by the boiler drum 1 to generate qualified steam for external supply; the shock wave cleaning device 10 is arranged between the hanging screen heating components 3, and the dust adsorbed on the heating surface is blown down and falls into the ash hopper 9 to be discharged from the waste heat boiler.

[0035] This device is used for the flue gas treatment system after the incinerator of hazardous waste, solid waste, garbage, medical waste, etc., to recover the waste heat of high-temperature flue gas, saving investment costs while reducing the floor space and height, while ensuring that the exhaust temperature is 500-550℃, the high-temperature fly ash can be effectively removed, and the overall heating area can be adjusted to meet the requirements of different working conditions.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the scope of protection of the claims of the utility model.

Claims

1. A waste heat boiler for incineration of hazardous waste with an internal screen, comprising a steel frame, a boiler drum installed above the steel frame, and a boiler body suspended by the steel frame; the boiler body comprises a furnace, and the furnace is divided into a plurality of chambers connected in sequence along the direction of flue gas flow by setting partition walls; among the chambers, the first chamber is connected to the flue gas inlet of the furnace, and the second chamber is connected to the flue gas outlet of the furnace; characterized in that: A hanging screen heating component is provided in the second chamber; the hanging screen heating component is a plurality of heating surfaces composed of upper and lower headers and membrane walls, and the spacing between the heating surfaces of the hanging screen heating component is not less than 800 mm; the hanging screen heating component is suspended in the steel frame by a hanging component, and at the same time, a shock wave cleaning device is arranged along the height direction between the heating surfaces of the hanging screen heating component.

2. The hazardous waste incineration waste heat boiler with internal screen according to claim 1 is characterized in that: The furnace is formed into a two-channel or four-channel structure by arranging partition walls; the smoke inlet and the smoke outlet of the furnace are both arranged close to the upper part of the furnace.

3. The hazardous waste incineration waste heat boiler with internal screen according to claim 2 is characterized in that: The first chamber is a cavity structure formed by connecting a partition wall, a front wall, a top wall and two side walls, and has a smoke turning outlet at the bottom; the second chamber is a cavity structure formed by connecting a partition wall, a rear wall, a top wall and two side walls, and has a smoke turning inlet at the bottom.

4. The hazardous waste incineration waste heat boiler with internal screen according to claim 3 is characterized in that: The furnace is sealed and connected with an ash hopper at the lower part of the first chamber and the second chamber, and an ash conveying device is arranged at the lower part of the ash hopper.

5. The hazardous waste incineration waste heat boiler with internal screen according to claim 4 is characterized in that: The steel frame is a closed frame formed by connecting a plurality of columns and beams.

6. The hazardous waste incineration waste heat boiler with internal screen according to claim 5 is characterized in that: Both ends of the hanging screen heating component are connected to the partition wall and the rear wall through connecting parts by fastening bolts.

Images