Large-capacity ash-deposition-preventing coal-fired layer-fired hot water boiler

Abstract

The utility model discloses a high-capacity ash-deposition-preventing coal-fired layer-fired hot water boiler, and belongs to the technical field of hot water boilers. A high-capacity ash-deposition-preventing coal-fired layer-fired hot water boiler comprises a combustion part, a first support, a second support and a boiler body, wherein the combustion part is installed on the first support; the denitration part is mounted on the second bracket; the coal saving part is fixedly connected to the second bracket, and the coal saving part is connected with the denitration part; the ash falling part is fixedly connected to the bottom of the combustion part; a heating surface is arranged in the combustion part; according to the utility model, the heating surface of the convection bank adopts a smoke longitudinal scouring structure, the ash falling system is arranged below the convection bank heating surface, the heating surface of the tail part of the boiler adopts smoke flowing from top to bottom and is provided with the ash blowing part, and the two ways are adopted, so that the ash deposition is effectively prevented, the heat exchange efficiency is ensured, and the equipment maintenance cost and the energy waste caused by the ash deposition are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot water boiler technical field especially relates to a large capacity prevent ash coal layer combustion hot water boiler. BACKGROUND

[0002] The biggest characteristic of lignite is high moisture content, high ash content, low calorific value, low cost, and it is usually not recommended as a high-quality fuel for combustion.

[0003] Therefore, a hot water boiler capable of using lignite as a fuel for urban central heating to overcome the problem of ash accumulation is particularly important, which can save operating costs and meet increasingly stringent environmental emission requirements. SUMMARY

[0004] The utility model discloses a large capacity prevent ash coal layer combustion hot water boiler to solve the problems in the background art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A large capacity prevent ash coal layer combustion hot water boiler, comprising:

[0007] A combustion part is installed on the first support;

[0008] A denitration part is installed on the second support;

[0009] A coal saving part is fixedly connected to the second support, and the coal saving part is connected to the denitration part;

[0010] An ash falling part is fixedly connected to the bottom of the combustion part;

[0011] The combustion part is provided with a heating surface.

[0012] Preferably, the heating surface includes a furnace heating surface and a convection tube bundle heating surface.

[0013] Preferably, the coal saving part includes a first coal saving device and a second coal saving device, both of which are fixedly connected to the second support, the first coal saving device is connected to the tail end of the denitration part, and the end of the first coal saving device away from the denitration part is connected to the second coal saving device.

[0014] Further, the first coal saving device and the second coal saving device are both fixedly connected with an ash blowing part.

[0015] Further, the first coal saving device and the second coal saving device both adopt a double-H finned tube structure.

[0016] Further, the furnace heating surface adopts a membrane water cooling wall structure.

[0017] Compared with the prior art, the large-capacity anti-ash coal-fired hot water boiler has the following beneficial effects:

[0018] The parts not involved in the device are the same as or can be realized by the prior art, the utility model discloses a longitudinal scouring structure is used to the heat receiving surface of the convection tube bundle, and the ash falling system is arranged below, the heat receiving surface of the boiler tail adopts the flow of flue gas from top to bottom, and the ash blowing part is arranged, the two tubes are used together, effectively prevent the ash, guarantee the heat exchange efficiency, reduce the equipment maintenance cost and energy waste caused by the ash. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A large-capacity anti-ash coal-fired hot water boiler structure schematic diagram is provided for the utility model.

[0020] In the drawing: 1, combustion part, 2, hearth heat receiving surface, 3, convection tube bundle heat receiving surface, 4, denitration part, 5, first coal economizer, 6, second coal economizer, 7, ash falling part, 8, ash blowing part, 9, first support, 10, second support. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0022] Embodiment 1:

[0023] Referring to Figure 1 A large-capacity anti-ash coal-fired hot water boiler, comprising:

[0024] The combustion part 1 is installed on the first support 9;

[0025] The denitration part 4 is installed on the second support 10;

[0026] The coal saving part is fixedly connected to the second support 10, and the coal saving part is connected to the denitration part 4;

[0027] The ash falling part 7 is fixedly connected to the bottom of the combustion part 1, and the ash falling part 7 is arranged directly below the convection tube bundle heat receiving surface 3;

[0028] The heat receiving surface is provided in the combustion part 1.

[0029] The heat receiving surface includes the hearth heat receiving surface 2 and the convection tube bundle heat receiving surface 3.

[0030] The area of the convection tube bundle heat receiving surface 3 of the boiler adopts a longitudinal scouring structure of flue gas, and the ash falling system is arranged below to avoid the problem of ash accumulation; and the heat receiving surface of the boiler tail adopts the flow of flue gas from top to bottom, and the ash blowing part 8 is arranged to effectively prevent the ash.

[0031] The convection tube bundle heating surface 3 in the application adopts a flue gas longitudinal scouring structure and is provided with an ash falling system below, the tail heating surface of the boiler adopts a flue gas flowing from top to bottom and is provided with a soot blowing part 8, and the two are combined, which effectively prevents ash deposition, ensures heat exchange efficiency, and reduces equipment maintenance cost and energy waste caused by ash deposition.

[0032] With reference to Figure 1 , the combustion part 1 is an inclined reciprocating grate burner, sufficient inclined reciprocating grate area is designed, the furnace is designed to be high and large, and a membrane water wall structure is adopted, which can prolong the residence time of unburned particles in the furnace and improve the fuel burnout rate, meet the rated thermal power of the boiler in the load operation of 116MW and above, effectively solve the problem of insufficient combustion of lignite, and reduce the fuel cost.

[0033] The coal saving part includes a first coal saving device 5 and a second coal saving device 6, the first coal saving device 5 and the second coal saving device 6 are fixedly connected to the second support 10, the first coal saving device 5 is connected to the tail end of the denitration part 4, and the end of the first coal saving device 5 away from the denitration part 4 is connected to the second coal saving device 6.

[0034] It should be noted that the first coal saving device 5 is a high-temperature coal saving device, and the second coal saving device 6 is a low-temperature coal saving device.

[0035] It should be further noted that the denitration part 4 is an SCR denitration device that can be purchased on the market.

[0036] The soot blowing part 8 is fixedly connected to the first coal saving device 5 and the second coal saving device 6.

[0037] The first coal saving device 5 and the second coal saving device 6 are both internally provided with a double-H finned tube structure.

[0038] With reference to Figure 1 , by adopting the double-H finned tube structure of the first coal saving device 5 and the second coal saving device 6, the space occupied can be minimized while the heating area is ensured, and the difficulty in arranging the tail of the large-capacity boiler is effectively solved; and the special structure of the double-H finned tube can resist fly ash abrasion and improve the service life.

[0039] The furnace heating surface 2 adopts a membrane water wall structure.

[0040] With reference to Figure 1 , by adopting the membrane water wall structure of the furnace heating surface 2, the installation is more convenient, and the installation period and cost of the boiler can be effectively reduced.

[0041] It also needs to be explained that the boiler is also provided with a water circulation part, and the boiler return water is low-temperature water, when designing the return water, after being heated by high-temperature flue gas, the return water enters the tail heating surface to improve the pipe wall temperature, so as to avoid dew point corrosion and ash deposition caused by the dew point of the return water and the low-temperature flue gas at the tail of the boiler; at the same time, the boiler body adopts a composite water circulation process of natural circulation and forced circulation, which can not only meet the safe operation of the boiler, but also reduce the water resistance of the body and save the operation power consumption of the circulating pump.

[0042] The above describes only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A large-capacity dusting coal-fired layer combustion hot water boiler, characterized in that, Include: The combustion part (1) is installed on the first support (9); The denitration part (4) is installed on the second support (10); The coal saving part is fixedly connected to the second support (10), and the coal saving part is connected to the denitration part (4); The ash falling part (7) is fixedly connected to the bottom of the combustion part (1); The heating surface is arranged in the combustion part (1); The heating surface includes the hearth heating surface (2) and the convection tube bundle heating surface (3); The coal saving part includes the first coal saving device (5) and the second coal saving device (6), the first coal saving device (5) and the second coal saving device (6) are fixedly connected to the second support (10), the first coal saving device (5) is connected to the tail end of the denitration part (4), and one end of the first coal saving device (5) away from the denitration part (4) is connected to the second coal saving device (6); The first coal saving device (5) and the second coal saving device (6) are fixedly connected with the ash blowing part (8).

2. A large-capacity, anti-ash, coal-fired, hot water boiler of the stoker type according to claim 1, characterized in that, The first coal saving device (5) and the second coal saving device (6) adopt double-H finned tube structure.

3. A large-capacity, anti-ash, coal-fired, hot water boiler of the stoker type according to claim 1, characterized in that, The hearth heating surface (2) adopts a membrane water cooling wall structure.

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