CN215570484U

CN215570484U - Waste incineration boiler of front end processing flue gas

Info

Publication number: CN215570484U
Application number: CN202121725495.6U
Authority: CN
Inventors: 佘宏飞; 桂百芳; 余期升; 陈玉村; 李靖涛; 边际
Original assignee: Jianglian Heavy Industry Group Co ltd
Current assignee: Jianglian Heavy Industry Group Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-01-18
Anticipated expiration: 2031-07-28

Abstract

The utility model discloses a waste incineration boiler with front-end smoke treatment, which comprises a boiler body, wherein an incineration grate and gravity separation are arranged in the boiler bodyThe incinerator comprises an incinerator grate, a water-cooled hearth and a heat exchange mechanism, wherein the incinerator grate is connected with the gravity separator through a burnout section flue, a feeding hopper and a slag cooling hopper are arranged on the incinerator grate, a purified flue is arranged at the outlet end of the gravity separator, the purified flue is connected with the water-cooled hearth, the water-cooled hearth is connected with the heat exchange mechanism, and the heat exchange mechanism is connected with a flue gas outlet window_xThe problems of large sacrificial load fluctuation and non-ideal large boiler reduction effect can be widely applied to the reduction of NO in flue gas_xThe waste incineration boiler with more content and fly ash particles can be also applied to coal-fired boilers and biomass boilers.

Description

Waste incineration boiler of front end processing flue gas

Technical Field

The utility model relates to the field of waste incineration boilers, in particular to a waste incineration boiler with a front end for treating smoke.

Background

The smoke of the conventional waste incineration power generation boiler directly enters heating surfaces such as a hearth, an evaporator, a superheater, an economizer and the like for heat exchange and work once after high-temperature smoke is generated by combustion, NOx and fly ash are generated in the combustion process of the incineration waste, the smoke can pollute the heating surfaces and influence the environment without being treated, measures must be taken to meet the requirement of environmental protection, and then a selective reduction method or a non-selective reduction method is adopted in the hearth of a high-temperature area of the waste heat boiler to reduce the generation method of the smoke NOx. The method is influenced by the volume of the hearth, and for a large boiler, because the section of the hearth is large, the ideal mixing reaction state of the flue gas and the reducing agent is difficult to realize, and the flue gas can continue to exchange heat backwards without reducing NOx in time under the state of higher flow velocity of the flue gas, so the effect is not ideal. And the flue gas in the furnace also can fluctuate instantaneously due to the spraying of the liquid ammonia, and the fluctuation of the flue gas can cause the local fatigue stress of the film wall of the furnace, thus influencing the service life of the film wall in the past. The flue gas with the entrained fly ash particles easily pollutes the heating surface when flowing through the heating surface, the heat exchange is affected by a light person, the circulation heat exchange of the flue gas is affected by the serious ash collection of the heating surface, the local ash blockage of the heating surface is caused, the heat exchange surface is unevenly heated by the local ash blockage, and the stress of a pressure piece is generated until the pipe explosion is caused, so that the stable operation of the boiler is affected. In order to reduce dust collection of the heating surface, a soot blower has to be installed near the heating surface, and the soot blower is put into use to accelerate collision of flue gas fly ash particles with the heating surface instantly, and also to blow up the amount of settled fly ash particles in the flue gas again, so that the flow direction of the flue gas is disturbed, the abrasion of the heating surface in contact with the flue gas is also intensified, and the dilemma that the long-term stable operation cannot be realized exists.

The soot blower is high in investment and use cost, the service life of a heating surface is reduced due to the soot blower, an ash collecting hopper is required to be arranged at the lower part of the heating surface to convey settled ash, more heating surfaces are arranged, more ash collecting hoppers are required to be arranged, the occupied space of the ash collecting hoppers is large along with the large-scale boiler, the ash is required to be collected into one ash collecting system due to the fact that more ash collecting hoppers are arranged, the ash collecting system is large in occupied area and complex in system, the technical requirements on construction, operation and maintenance personnel are high, the investment and installation cost is high, the construction period is long, a large amount of manpower and material resources are consumed, the ash is conveyed, and an ash conveying machine is additionally arranged, so that the equipment investment cost is high; once a fault occurs in any link during operation, the boiler cannot operate stably, and the maintenance cost is high and uneconomical.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problems in the prior art and provides a waste incineration boiler with a front-end flue gas treatment function.

In order to achieve the purpose, the technical scheme provided by the utility model is as follows: the utility model provides a waste incineration boiler of front end processing flue gas, includes boiler body, this internal burning grate, gravity separator, water-cooling furnace, exhanst gas outlet window and the heat transfer mechanism of being provided with of boiler, burning grate through burn out the section flue with gravity separator connects, it is provided with hopper and slag cooler fill on the grate to burn, the gravity separator exit end is provided with purifies the back flue, purify the back flue and be connected with water-cooling furnace, water-cooling furnace with heat transfer mechanism connects, heat transfer mechanism with the exhanst gas outlet window is connected.

Preferably, the incineration grate comprises a pushing grate and a grate shell protecting plate.

Preferably, the heat exchange mechanism comprises an evaporator, a superheater and an economizer, the evaporator is connected with the superheater, and the superheater is connected with the economizer.

Preferably, the burnout section flue comprises a pipeline corrugated pipe, a pipeline supporting and hanging bracket and an induced draft fan.

Preferably, the clean back flue comprises a supply duct, a valve and a duct support hanger.

The utility model has the beneficial effects that:

1. the utility model can effectively reduce NOx in high-temperature flue gas through the gravity separator, and has simple system and simple and convenient implementation.

2. According to the utility model, after flue gas is generated, the flue gas is firstly purified and then transfers heat to do work, and the clean flue gas without entrained fly ash particles has good heat exchange effect and high heat efficiency when flowing through the heat exchange mechanism; and no fly ash collision exists in the heat exchange process, the service life of the heat exchange mechanism is prolonged, and the long-term stable operation of the boiler is facilitated.

3. The utility model reduces the investment and the use of the soot blower, does not need to consider a soot collecting hopper and a soot collecting system, saves a large amount of investment cost and ensures that the whole waste incineration boiler system is more simple, convenient and compact; the technical requirements on construction, operation and maintenance personnel are lower, and the whole system is simple and elegant in structure and durable.

4. The utility model solves the problems of large sacrificial load fluctuation and non-ideal reduction effect of large boilers for reducing NOx to a great extent, can be widely applied to waste incineration boilers needing to reduce NOx content in flue gas and more fly ash particles, and can also be applied to coal-fired boilers and biomass boilers.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.

Fig. 1 is a schematic view of the overall structure of the preferred embodiment of the present invention.

The attached drawings are marked as follows:

1-a feeding hopper 2-an incineration grate 3-a burnout section flue 4-a slag cooling hopper 5-a gravity separator 6-a purified flue 7-a water-cooled hearth 8-an evaporator 9-a superheater 10-an economizer 11-a flue gas outlet window.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1, a preferred embodiment of the present invention, a waste incineration boiler for front-end treatment of flue gas, includes a boiler body, the boiler body is internally provided with an incineration grate 2, a gravity separator 5, a water-cooling hearth 7, a flue gas outlet window 11 and a heat exchange mechanism, the incineration grate 2 is connected with the gravity separator 5 through a burnout section flue 3, the gravity separator 5 can purify the flue gas containing NOx gas with fly ash particles after the garbage incineration outside the furnace, reduce NOx, separate the fly ash in the flue gas, treat the flue gas into high-temperature clean flue gas without carrying and pollution, the incineration grate 2 is provided with a feeding hopper 1 and a slag cooling hopper 4, the outlet end of the gravity separator 5 is provided with a purified flue 6, the purified flue 6 is connected with the water-cooled hearth 7, the water-cooled hearth 7 is connected with the heat exchange mechanism, and the heat exchange mechanism is connected with the flue gas outlet window 11.

The utility model can effectively reduce NOx in high-temperature flue gas through the gravity separator 5, and has simple system and simple and convenient implementation; according to the utility model, after flue gas is generated, the flue gas is firstly purified and then transfers heat to do work, and the clean flue gas without entrained fly ash particles has good heat exchange effect and high heat efficiency when flowing through the heat exchange mechanism; no fly ash collision exists in the heat exchange process, the service life of the heat exchange mechanism is prolonged, and the long-term stable operation of the boiler is facilitated; the utility model reduces the investment and the use of the soot blower, does not need to consider a soot collecting hopper and a soot collecting system, saves a large amount of investment cost and ensures that the whole waste incineration boiler system is more simple, convenient and compact; the technical requirements on construction, operation and maintenance personnel are lower, and the whole system is simple and elegant in structure and durable; the utility model solves the problems of large sacrificial load fluctuation and non-ideal reduction effect of large boilers for reducing NOx to a great extent, can be widely applied to waste incineration boilers needing to reduce NOx content in flue gas and more fly ash particles, and can also be applied to coal-fired boilers and biomass boilers.

As a preferred embodiment of the present invention, it may also have the following additional technical features:

in this embodiment, the incineration grate 2 includes a pushing grate and a grate housing guard plate, the pushing grate and the grate housing guard plate can further ensure that the incineration waste entering the furnace can be heated, dried, volatilized, burned out and generate high-temperature flue gas, and the burned ash and slag enter the cold slag hopper 4, so that the incineration waste is more complete and more environment-friendly.

In this embodiment, heat exchange mechanism includes evaporimeter 8, over heater 9 and economizer 10, evaporimeter 8 with over heater 9 is connected, over heater 9 with economizer 10 is connected, and the clean flue gas of handling passes through evaporimeter 8, over heater 9 and economizer 10 heating surface carry out the heat transfer and do work, can not make the local stifled ash of heating surface, thereby avoid the heating surface to be heated the inequality and arouse that the pressurized piece produces stress until the pipe explosion, can increase of service life, and hot effectual moreover, the thermal efficiency is high, and is more stable.

In this embodiment, burn out section flue 3 includes pipeline bellows, pipeline gallows and draught fan, burn out section flue 3 can introduce the gravity separator 5 that reduces flue gas NOX and generate with the high temperature flue gas that contains NOX and fly ash granule, burn out section flue 3 is tight heat-resisting pipe-line system that does not leak, can make the more stable introduction gravity separator 5 of high temperature flue gas, and work efficiency is higher.

In this embodiment, the flue 6 after purification includes a supply pipe, a valve, and a pipe hanger, and the flue 6 after purification is also a tight and leak-free heat-resistant pipe system, and can send the treated clean flue gas into the water-cooled furnace 7 again, and the fluctuation of the treated clean flue gas is not too large, so that the membrane wall of the water-cooled furnace 7 does not generate fatigue stress locally, and the service life of the membrane wall is not affected.

The above additional technical features can be freely combined and used in superposition by those skilled in the art without conflict.

The above description is only a preferred embodiment of the present invention, and the technical solutions that achieve the objects of the present invention by basically the same means are all within the protection scope of the present invention.

Claims

1. The utility model provides a msw incineration boiler of front end processing flue gas which characterized in that: the boiler comprises a boiler body, this internal burning grate (2), gravity separator (5), water-cooling furnace (7), exhanst gas outlet window (11) and heat transfer mechanism of being provided with of boiler, burning grate (2) through burn out section flue (3) with gravity separator (5) are connected, it is provided with hopper (1) and cold slag fill (4) to burn on grate (2), gravity separator (5) exit end is provided with purifies back flue (6), purify back flue (6) and be connected with water-cooling furnace (7), water-cooling furnace (7) with heat transfer mechanism connects, heat transfer mechanism with exhanst gas outlet window (11) are connected.

2. A waste incineration boiler with front end flue gas treatment according to claim 1, characterised in that: the incineration grate (2) comprises a pushing grate and a grate shell protecting plate.

3. A waste incineration boiler with front end flue gas treatment according to claim 1, characterised in that: the heat exchange mechanism comprises an evaporator (8), a superheater (9) and an economizer (10), the evaporator (8) is connected with the superheater (9), and the superheater (9) is connected with the economizer (10).

4. A waste incineration boiler with front end flue gas treatment according to claim 1, characterised in that: the burnout section flue (3) comprises a pipeline corrugated pipe, a pipeline supporting and hanging bracket and an induced draft fan.

5. A waste incineration boiler with front end flue gas treatment according to claim 1, characterised in that: the purified flue (6) comprises a supply pipeline, a valve and a pipeline supporting and hanging frame.