CN219140784U - Smoke circulating device of garbage incinerator - Google Patents

Abstract

The utility model discloses a smoke circulating device of a garbage incinerator, which comprises an incinerator, an integrated flue, an economizer and a smoke circulating pipeline; the flue gas circulation pipeline comprises a first circulation flue and a second circulation flue, the first circulation flue is used for communicating the economizer with a flue outlet of the incinerator, and the second circulation flue is used for communicating an ash outlet of the incinerator with a material outlet of the incinerator. The utility model reduces the generation of nitrogen oxides in the furnace, increases the flue gas quantity in the furnace, reduces the outlet air quantity of the boiler, reduces the waste heat loss of flue gas, and increases the temperature and the oxygen content of a drying zone of the hearth by recycling the flue gas, thereby improving the energy recycling efficiency.

Description

Smoke circulating device of garbage incinerator

Technical Field

The utility model relates to the technical field of garbage incineration, in particular to a smoke circulating device of a garbage incinerator.

Background

In the process of garbage incineration, NO can be generated in the hearth _x Such as toxic and harmful gases, which are discharged from the smoke outlet along with the smoke, and cause great pollution to the environment, NO is required to be discharged in order to reduce the emission of toxic gases _x The emission of the smoke is controlled to reach the emission standard when the smoke is emitted. Reducing the NO in the tail gas of incinerator _x The most effective means of emission are: lowering the temperature of the incineration area and lowering O ₂ Concentration, establishment of a denitration process for flue gas, addition of reducing substances in the flue gas, and the like.

In order to reduce the denitration cost, the NO is generally treated before the flue gas is subjected to the denitration process _x In the prior device, a fan is arranged between the hearth and a smoke treatment system, and the fan pumps the smoke into the hearth to recycle the smoke, but the device has a single structure, can not realize the circulation of the smoke in a nuclear smoke pipeline of the hearth, and removes NO _x Is inefficient.

Disclosure of Invention

The utility model aims to provide a smoke circulating device of a garbage incinerator, which aims to solve the technical problems of single structure and low efficiency of a smoke circulating system in the prior art.

In order to solve the technical problems, the utility model specifically provides the following technical scheme:

the utility model provides a smoke circulating device of a garbage incinerator, which comprises an incinerator, an integrated flue, an economizer and a smoke circulating pipeline;

the flue gas circulation pipeline comprises a first circulation flue and a second circulation flue, the first circulation flue is used for communicating the economizer with a flue outlet of the incinerator, and the second circulation flue is used for communicating an ash outlet of the incinerator with a material outlet of the incinerator;

the incinerator comprises a hearth, a material port and a slag outlet are respectively arranged at the left end and the right end of the hearth, a fire grate is arranged in the hearth, and an air outlet is arranged at the joint of the hearth and the integrated flue;

the two sides of the air outlet are respectively provided with a front arch and a rear arch which shrink inwards, and the front arch and the tip of the rear arch are oppositely arranged;

the first circulating flue is arranged outside the hearth and connects the economizer with the air outlet, and the second circulating flue is arranged outside the hearth and communicates the slag outlet with the material port.

As a preferable scheme of the utility model, the first circulating flue comprises a first exhaust pipe and a first air outlet pipe, the first exhaust pipe is connected with the first air outlet pipe through an integrated circulating fan, the first exhaust pipe is communicated with a smoke outlet of the economizer, the first air outlet pipe is communicated with the air outlet through a three-way smoke pipe, and the integrated circulating fan is used for carrying out negative pressure suction on the first exhaust pipe so that smoke flowing out of the economizer enters the air outlet from the first air outlet pipe.

As a preferable mode of the utility model, two passages of the three-way smoke pipe are respectively arranged at the front arch and the rear arch.

As a preferable scheme of the utility model, the first exhaust pipe is provided with a high-temperature bag-type dust remover, and the high-temperature bag-type dust remover is arranged between the integrated circulating fan and the coal economizer.

As a preferable scheme of the utility model, the second circulating flue comprises a second exhaust pipe and a second air outlet pipe communicated with the second exhaust pipe through the integrated circulating fan, the second exhaust pipe is communicated with the slag outlet, the second air outlet pipe is communicated with the material port, and the integrated circulating fan performs negative pressure suction on the second exhaust pipe so that gas at the slag outlet enters from the second exhaust pipe to the bottom of the material port.

As a preferable scheme of the utility model, the second air outlet pipe penetrates through the hearth and is connected with a blowing pipe, and the blowing direction of the blowing pipe is opposite to the garbage discharging direction of the material opening in the hearth.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The integrated fan increases the flue gas amount in the boiler by circulating the flue gas, reduces the outlet air amount of the boiler and reduces the waste heat loss of the flue gas;

(2) The flue gas recirculation reduces the temperature and the oxygen content of the main combustion zone of the boiler to form a reducing atmosphere environment, so that the generation of nitride is reduced, and the use of a denitration agent is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art that the drawings in the following description are merely exemplary and that other embodiments may be derived from the drawings of the lifting arch without inventive effort.

FIG. 1 is a schematic diagram of a smoke circulation device of a lifting arch garbage incinerator;

FIG. 2 is a schematic diagram of the structure of the lifting arch flue gas circulation pipeline of the utility model;

FIG. 3 is a schematic structural view of the lifting arch multistage dust removal cloth bag;

FIG. 4 is an enlarged view of a partial structure of the lifting arch multistage dust collection cloth bag of the utility model;

FIG. 5 is a schematic top view of a lifting arch multistage dust collection cloth bag of the present utility model;

FIG. 6 is a schematic side view of a lifting arch multistage dust bag of the present utility model.

Reference numerals in the drawings are respectively as follows:

1-an incinerator; 2-an integrated flue; 3-economizer; 4-deacidifying tower; 5-a cloth bag dust removing device; 6-a flue gas circulation pipeline; 7-an integrated circulating fan; 8-a three-way smoke tube; 9-a high-temperature bag-type dust remover; 10-a blowpipe; 11-folding flame angle; 12-a secondary air blower; 13-a water supplementing pipeline; 14-heating the tube; 15-raking teeth; 16-primary heat exchange tubes; 17-a secondary heat exchange tube; 18-lower layer cavity; 19-upper layer cavity; 20-a feeding fan; 21-ash blocking plate; 22-an ash valve; 23-a drying section; 24-combustion section; 25-burn-out section; 26-smoke holes:

101-a hearth; 102, a material port; 103-slag outlet; 104-a fire grate; 105-gas outlet; 106-front arch; 107-rear arch;

501-a shell box; 502-a smoke inlet pipeline; 503-a first-level cloth bag assembly; 504-a secondary cloth bag assembly;

5031-a first-level cloth bag cylinder; 5032-primary pulse tube; 5033-well plate;

5041-a secondary cloth bag cylinder; 5042-a secondary pulse tube;

601-a first circulation flue; 602-a second circulation flue;

6011-first exhaust pipe; 6012-first outlet duct;

6021-second exhaust tube; 6022-second outlet duct.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 6, the utility model provides a flue gas circulation device of a garbage incinerator, which comprises an incinerator 1, an integrated flue 2, an economizer 3, a deacidification tower 4 and a bag-type dust collector 5, wherein raw flue gas is generated after garbage in the incinerator 1 is incinerated, and enters the integrated flue 2, the economizer 3 and the deacidification tower 4 in sequence and finally is deeply deacidified in the bag-type dust collector 5 to be discharged as clean flue gas;

a flue gas circulation pipeline 6 is arranged between the incinerator 1 and the economizer 3, and the flue gas circulation pipeline 6 is used for extracting part of flue gas from a slag outlet of the incinerator 1 and the economizer 3 and sending the part of flue gas into the incinerator 1 for circulation.

The incinerator 1 incinerates the garbage entering the incinerator through hot air from top to bottom, and a specific incineration device and an incineration process of the incinerator are simpler and more concise existing structures and processes, and are not described in detail herein. The specific working flow of the device is as follows: the garbage enters the incinerator 1 and is incinerated, the incinerated garbage is changed into flue gas and slag, the flue gas upwards flows out of the integrated flue 2 to the economizer 3, the flue gas flowing out of the economizer 3 enters the deacidification tower 4 for preliminary deacidification, and finally enters the bag-type dust collector 5 for deep deacidification.

Specifically, the flue gas circulation pipeline 6 includes a first circulation flue 601 and a second circulation flue 602, the first circulation flue 601 communicates the economizer 3 with the flue outlet of the incinerator 1, and the second circulation flue 602 communicates the slag outlet of the incinerator 1 with the material outlet of the incinerator 1. The lower slag hole of the incinerator 1 is a dust removing outlet for generating garbage residues after the garbage is burnt, the dust removing outlet is arranged below the burnt section, the material hole of the incinerator 1 is a garbage feeding hole, and the dust removing outlet is arranged above the drying section.

When the flue gas drifts, the flue gas circulation pipeline 6 pumps the flue gas which has entered the economizer 3 into the combustion section of the hearth in the incinerator 1 again for combustion and reutilization, thus realizing the circulation of the flue gas; meanwhile, the flue gas circulation pipeline 6 pumps the gas at the slag outlet to the lower part of the fire grate at the garbage inlet of the incinerator 1, namely the ash hopper at the drying section, so that the heat of the flue gas is effectively utilized, and the garbage at the drying section at the inlet is baked. The feed opening of the incinerator 1 is arranged at the inlet above the drying section.

When incinerating garbage, the incinerator 1 generates NO which has a great influence on the environment _x Toxic gas like, NO _x There are mainly three sources: 1. the organic and inorganic nitrogen-containing compounds of the garbage are mixed with O in the incineration process ₂ Generating NO by reaction _x The method comprises the steps of carrying out a first treatment on the surface of the 2. N in combustion air ₂ Oxidized to form NO under high temperature condition _x The method comprises the steps of carrying out a first treatment on the surface of the 3. Combustion-supporting fuel such as natural gas, diesel oil and the like for burning to generate NO _x 。

In the embodiment, the momentum of the flue gas wind, the heat of the flue gas and the momentum are recycled by using the circulating wind, so that NO is reduced _x Is generated by:

1. the flue gas entering the economizer 3 is pumped into the hearth of the burning incinerator 1, and the oxygen content of the flue gas is low, so that the flue gas is circulated into the hearth, and the following beneficial effects are achieved:

1. lowering O ₂ Concentration, O in flue gas of economizer 3 after garbage combustion ₂ Very low concentration, lowering the high temperature region O ² Concentration of N is effectively reduced ² And O ² Is reacted at a high temperature; 2. the flue gas circulates, the flue gas circulates back to the burning zone of the incinerator through the flue gas circulating pipeline 6, and O in the air is diluted ² Concentration, lowering the temperature after burning; 3. the flue gas is stirred, and the flue gas from the economizer 3 is discharged into the incinerator 1 through the flue gas circulation pipeline 6, so that the flue gas can be stirred, and the temperature at the flue gas outlet of the hearth can be uniform.

2. The flue gas entering the slag outlet of the incinerator 1 is pumped into the hearth of the burning incinerator 1, and the flue gas has high oxygen concentration and high heat, so the flue gas is circulated into the hearth as follows

The beneficial effects are that:

1. adjusting the outlet position of combustion air, and transferring the extracted flue gas to the lower part of the fire grate for supplying air, so that the heated flue gas leaving the main reaction zone still burns garbage together with hot air; 2. waste heat in the flue gas is used for baking the garbage at the feeding port of the hearth, so that the garbage is burnt; 3. the garbage is lifted, and the garbage can be blown up when the flue gas is blown to the feeding hole of the hearth, so that the garbage is separated, and the drying efficiency of moisture in the garbage is improved.

The flue gas denitration process established in this embodiment is to NO before flue gas denitration process _x The generation of nitrogen oxides is inhibited, and the flue gas is repeatedly combusted to reduce the air ratio and the oxygen content of combustion in a hearth, so that the generation of the nitrogen oxides is inhibited, and the consumption of denitration raw materials is reduced; and the heat in the flue gas is utilized for multiple times to dry the garbage entering the hearth, the momentum of the flue gas is utilized to stir the flue gas and the garbage in the hearth, the recycling of the flue gas is realized, and the denitration cost is reduced.

The cloth bag dust removing device 5 comprises a shell box 501, and a smoke inlet pipeline 502, a primary cloth bag assembly 503 and a secondary cloth bag assembly 504 which are vertically arranged in the shell box 501, wherein the secondary cloth bag assembly 504 is positioned above the primary cloth bag assembly 503, and a plurality of primary cloth bag barrels of the primary cloth bag assembly 503 and a plurality of secondary cloth bag barrels of the secondary cloth bag assembly 504 are arranged in a staggered manner in the horizontal direction;

the smoke inlet pipe 502 vertically passes through the upper end of the outer shell box 501 downwards and the inner part of the primary cloth bag assembly 503 so as to convey smoke to the bottom end of the outer shell box 501, and the smoke inlet pipe 502 is arranged on the outer periphery side of the secondary cloth bag assembly 504 in parallel.

The bag dust collector 5 is a dry dust collector suitable for collecting fine, dry non-fibrous dust. The primary cloth bag assembly 503 in this embodiment is composed of a plurality of cylindrical filter bags, namely a primary cloth bag cylinder, the primary cloth bag assembly 503 is composed of a plurality of structures identical to those of the primary cloth bag cylinder, namely a secondary cloth bag cylinder, the cloth bag cylinder can be made of textile filter cloth, raw materials for deeply deacidifying smoke are attached to fiber fabrics, dust-containing gas is filtered by utilizing the filtering effect of the fiber fabrics, and acid gases such as sulfide nitrogen oxides in the smoke are deacidified by the raw materials adsorbed on the raw materials, when the raw smoke enters the cloth bag dust removing device 5, soot with large particles and large specific gravity is precipitated due to the effect of gravity, falls into an ash bucket, and when the gas containing finer dust passes through the filter materials, the dust is blocked, and the gas is deacidified after passing through the deacidified raw materials, so that the gas is purified.

The structure of the cloth bag dust removing device 5 mainly comprises an upper box body, a middle box body, an ash bucket, an ash cleaning system, an ash discharging mechanism and the like, wherein a plurality of cylindrical cloth bags are arranged in the cloth bag dust removing device, when smoke enters the smoke inlet pipe 502 through a plurality of pieces, the smoke in the smoke inlet pipe 502 flows to the outer side of the first-stage cloth bag barrel from the first-stage cloth bag barrel, a certain negative pressure is arranged in the first-stage cloth bag assembly 503, so that the smoke enters the first-stage cloth bag assembly 503 from the outer side again, and the gas in the cloth bag dust removing device is purified once; the flue gas subjected to primary purification enters the outer side of the secondary cloth bag assembly 504 from the inner side of the primary cloth bag assembly 503, and certain negative pressure is arranged in the secondary cloth bag assembly 504, so that the flue gas enters the inner side of the secondary cloth bag assembly 504 from the outer side of the secondary cloth bag assembly 504, secondary purification is realized, and the flue gas subjected to multiple purification becomes purified flue gas, and the purified flue gas flows into the outside air from the topmost end of the cloth bag dust removing device 5.

The utility model adopts the mode of adsorbing deacidification substances on the dust removal cloth bag to realize the purification of the flue gas, not only refines each strand of flue gas and deacidifies the flue gas, but also can place different deacidification agents in cloth bags with different heights to realize multi-stage deacidification, thereby improving the deacidification effect and speed, and the heat in the flue gas can be recycled when the flue gas is introduced, improving the energy utilization effect of waste incineration, reducing the heat loss when the flue gas is purified, and providing a proper temperature environment for deacidification.

Specifically, the incinerator 1 comprises a hearth 101, a material port 102 and a slag outlet 103 are respectively arranged at the left end and the right end of the hearth 101, a fire grate 104 is arranged in the hearth 101, an air outlet 105 is arranged at the joint of the hearth 101 and the integrated flue 2, a front arch 106 and a rear arch 107 which shrink inwards are respectively arranged at two sides of the air outlet 105, and the front arch 106 and the tip of the rear arch 107 are oppositely arranged. The first circulation flue 601 is arranged outside the furnace 101 and connects the economizer 3 with the gas outlet 105, and the second circulation flue 602 is arranged outside the furnace 101 and communicates the slag outlet 103 with the material port 102.

In order to facilitate distinguishing the combustion process of the hearth 101, a drying section 23, a combustion section 24 and a burning-out section 25 are sequentially arranged in the hearth 101 from left to right according to the combustion state of garbage, the drying section 23 is connected with a material port 102, and the burning-out section 25 is arranged close to a slag outlet 103. When the waste just enters the grate 104, it is first dried, and when dried to a certain extent, it flows under the influence of the grate 104 and gravity to the combustion section 24, and when the waste burns to ash, it enters the combustion section, where the flue gas is mainly concentrated. The gas outlet 105 is arranged at the joint of the hearth 101 and the integrated flue 2, the front arch 106 and the rear arch 107 are of inward arch closing structures, the front arch 106 and the rear arch 107 are mainly used for closing flue gas, and unburned slag is prevented from entering the integrated flue 2 under the acceleration of hot gas, and the front arch 106 and the rear arch 107 are of inward folding structures.

The garbage is obliquely discharged from the material opening 102 into the hearth 101 and falls on the fire grate 104, a hot air component is arranged below the fire grate 104, the hot air component supplies air to the fire grate 104 upwards, the garbage on the hot air component passes through the drying section 23, the combustion section 24 and the combustion section 25 respectively under the driving of the fire grate 104, finally the garbage is changed into flue gas and slag in the combustion section 25, the slag can fall downwards and finally is discharged from the slag outlet 103, the slag outlet 103 is the slag outlet, and the flue gas upwards flows into the integrated flue 2 from the position of the air outlet 105 through the front arch 106 and the rear arch 107 and flows into the economizer 3 from the integrated flue 2.

Because the oxygen content of the flue gas in the economizer 3 is low, 10-30% of the flue gas in the economizer 3 can be re-introduced above the combustion section 24 by adopting the flue gas circulation pipeline 6, namely the positions of the front arch 106 and the rear arch 107, and the flue gas introduced into the positions can stir the flue gas and be fully mixed with air above the combustion section 24, so that the oxygen content of a combustion zone is reduced.

Specifically, in this embodiment, the first circulation flue 601 includes a first exhaust pipe 6011, a first air outlet pipe 6012 and an integrated circulation fan 7, the first exhaust pipe 502 is communicated with a smoke outlet of the economizer 3, the first air outlet pipe 6012 is communicated with the air outlet 105 through a three-way smoke pipe 8, and the integrated circulation fan 7 performs negative pressure suction on the first exhaust pipe 502 to enable smoke flowing out of the economizer 3 to enter from the first air outlet pipe 6012 to the air outlet 105.

Preferably, two passages of the three-way smoke pipe 8 are respectively arranged at the front arch 106 and the rear arch 107, and when the three-way smoke pipe 8 is introduced with smoke, the front arch 106 and the rear arch 107 form smoke convection, so that the smoke is fully mixed, and the mixed flow effect is improved.

Preferably, in order to prevent the integrated circulation fan 7 from being blocked by the flue gas with higher temperature and higher density, the first exhaust pipe 6011 is provided with a high-temperature bag-type dust remover 9, and the high-temperature bag-type dust remover 9 is arranged between the integrated circulation fan 7 and the economizer 3, and the high-temperature bag-type dust remover 9 removes dust from the flue gas extracted from the economizer 3.

In this embodiment, the second circulation flue 602 includes a second air extraction pipe 6021 and a second air outlet pipe 6022 that is communicated with the second air extraction pipe 6021 through the integrated circulation fan 7, the second air extraction pipe 6021 is communicated with the slag outlet 103, the second air outlet pipe 6022 is communicated with the material inlet 102, and the integrated circulation fan 7 performs negative pressure suction on the second air extraction pipe 6021 so that the gas at the slag outlet 103 enters from the second air extraction pipe 6021 to the bottom of the material inlet 102, and the bottom of the material inlet 102 refers to a drying section 23 in the furnace 101.

Because the gas oxygen content at the slag outlet 103 is higher and the temperature is higher, flue gas at the slag outlet 103 is introduced to the drying section 23, so that heat can be supplemented to the drying section 23, oxygen can be supplemented to the hearth 101, combustion efficiency is improved, and meanwhile, garbage in the drying section 23 can be lifted by the kinetic energy of wind, so that drying efficiency is improved.

Preferably, in order to further increase the drying rate of the garbage in the drying section 23 and prevent the garbage from caking, the second air outlet pipe 6022 penetrates through the furnace chamber 101 and is connected with a blowing pipe 10, and the blowing direction of the blowing pipe 10 is opposite to the garbage discharging direction of the material port 102 in the furnace chamber 101.

Preferably, in order to prevent the unburned flue gas from directly entering the integrated flue 2, a folded flame corner 11 is provided on the integrated flue 2 in an inward protruding manner, and the folded flame corner 11 is vertically installed above the air outlet 105. The folded flame horn 11 plays a role in blocking flow of substances and air, so that dust ashes with flames and smoke without ashes are effectively prevented from directly entering the integrated flue 2, and the difficulty of later purification is reduced.

Preferably, the secondary air blower 12 is arranged outside the hearth 101, the secondary air blower 12 is connected with a heating tube 14 through a gas supplementing tube 13, the heating tube 14 penetrates through the hearth 101 and is transversely arranged above the fire grate 104, the gas supplementing tube 13 penetrates through the heating tube 14 and is connected with the integrated flue 2, and the tail end of the gas supplementing tube 13 is arranged at the position of the flame folding corner 11.

In general, the secondary air blower 12 is used for supplementing air in the furnace 101, but because the first circulation flue 601 and the second circulation flue 602 are adopted to extract flue gas to supplement air for the furnace 101, the structure of the secondary air blower 12 is changed to have other functions, and the secondary air blower 12 in the utility model supplements external air with sufficient oxygen content to the position of the flame folding corner 11, so that the burning of the flue gas is facilitated.

In this embodiment, the heating tube 14 transversely penetrates through the furnace chamber 101 and the penetrating end is rotatably mounted on the furnace chamber 101, and the end of the heating tube 14 penetrating through the furnace chamber 101 is connected with a hydraulic driving device, and the hydraulic driving device drives the heating tube 14 to rotate above the fire grate 104. A rotary heating tube 14 is arranged in the hearth 101, the tail end of the heating tube 14 is provided with a hydraulic driving device, the hydraulic driving device drives the heating tube 14 to rotate through a gear, and both ends of the heating tube 14 are connected with a water supplementing pipeline 13 of the secondary air fan 12. The raw air in the air supplementing pipeline 13 is the air with the same temperature as the air, when the raw air in the air supplementing pipeline 13 passes through the heating tube 14 and is heated, the raw air is changed into hot air with a certain temperature, the hot air in the air supplementing pipeline 13 is upwards introduced into the folded flame horn 11, and the unburned ash and gas at the folded flame horn 11 provide heat, so that the burning of the flue gas is prevented from being influenced due to the fact that the temperature of the outside air is too low.

Preferably, a flat tooth 15 is arranged on the outer wall of the heating tube 14, and the flat tooth 15 rotates above the fire grate 104 under the driving of the heating tube 14 and holds garbage flat. The rotating heating tube 14 arches and levels, lifts and pulverizes the garbage in the hearth 101 through the flat tooth 15, and the burning degree of the garbage is improved.

In this embodiment, the primary bag component 503 includes a plurality of primary bag drums 5031 arranged in matrix, a primary pulse tube 5032 vertically disposed in the primary bag drums 5031, and a hole plate 5033 dividing the housing box 501 into an upper layer and a lower layer, a plurality of holes are uniformly disposed on the hole plate 5033, the primary bag drums 5031 are installed below the hole plate 5033 through the holes, the smoke inlet pipe 502 vertically penetrates through the hole plate 5033 and the primary bag drums 5031 from the upper end of the housing box 501 in sequence, and the bottom of the smoke inlet pipe 502 is disposed at the bottom of the housing box 501.

The smoke inlet pipeline 502 is used for introducing smoke to the bottom of the primary cloth bag barrel 5031, and the smoke permeates into the primary cloth bag barrel 5031 from the outer side of the primary cloth bag barrel 5031, so that preliminary purification is realized. When the flue gas passes through the first-stage cloth bag barrel 5031 and reacts with chemical substances in the first-stage cloth bag barrel 5031 for deacidification, dust is separated out, and the separated dust can be adsorbed on the outer side of the first-stage cloth bag barrel 5031, so that in order to shake off the dust on the first-stage cloth bag barrel 5031, a first-stage pulse tube 5032 is arranged in the first-stage cloth bag barrel 5031, pulse air is introduced into the first-stage cloth bag barrel 5031 at an irregular time, the pulse air impacts the first-stage cloth bag barrel 5031, so that the cloth bag barrel shakes, and the dust on the cloth bag barrel shakes off.

In this embodiment, the secondary cloth bag assembly 504 includes a plurality of matrix-arranged secondary cloth bag drums 5041 and a secondary pulse tube 5042 vertically penetrating the secondary cloth bag drums 5041, where the secondary cloth bag drums 5041 are disposed above the orifice plate 5033 and suspended between every two of the holes.

The flue gas flowing upwards from the inside of the primary cloth bag barrel 5031 flows to the outer side of the secondary cloth bag barrel 5041 through the holes, and the flue gas permeates from the outer side of the secondary cloth bag barrel 5041 into the secondary cloth bag barrel 5041, so that secondary purification is realized. Dust is separated out when the flue gas passes through the secondary bag barrel 5041 for secondary deacidification, so the secondary bag barrel 5041 is internally provided with a secondary pulse tube 5042, and the dust removal principle of the secondary pulse tube 5042 is the same as that of the primary pulse tube 5032.

Preferably, the lower end of the primary pulse tube 5032 is provided with a plurality of air holes, one of which is in close contact with the smoke inlet pipe 502. The smoke inlet pipe 502 is easy to accumulate dust in a pipe in the process of conveying smoke, in order to prevent blockage caused by dust in the pipe, a rotary separation device is generally added at an inlet of the pipe, and further, in order to further clean the smoke inlet pipe 502, the primary pulse pipe 5032 blows air to the inner side of the smoke inlet pipe 502 through an air hole between the positions close to the smoke inlet pipe side by side, so that the smoke inlet pipe 502 blows and shakes under the action of wind force, and dust is blown down.

Preferably, a temperature reduction tower 4 with a cyclone deacidification tower and a left part and a right part which are connected in parallel can be further arranged, so that waste water without organic matters can be sprayed into the deacidification tower, the deacidification tower can be used as a reaction mixing tower added with a dry deacidification agent or a semi-dry deacidification agent, can also be used as a separation device for large-particle dust of flue gas, and can be used for adjusting the temperature of the flue gas at an inlet of a cloth bag, so that waste water of a part of production links is treated in a compatible manner. If one side is more dust-collecting, the one side can be separated for dust-collecting.

Preferably, a partition board is vertically arranged in the housing cavity 501, the partition board divides the housing cavity 501 into a left cavity and a right cavity, the plurality of first-stage cloth bag drums 5031 and the second-stage cloth bag drums 5041 are uniformly divided into a left cavity and a right cavity, and the left cavity, the right cavity and the right cavity are respectively installed to realize single-side isolation. The ash shaken off by the secondary cloth bag enters the outer side of the primary cloth bag and reacts again. Is not easy to enter the inner side of the first-level cloth bag.

Because the cloth bag cylinder continuously accumulates smoke dust in the use process, maintenance and cleaning are needed after the cloth bag cylinder is used for a period of time, but if all the cloth bag cylinders are cleaned at the same time, the work load is excessive, and the machine is stopped, so that the purification efficiency is delayed. According to the utility model, the first-stage cloth bag barrel 5031 and the second-stage cloth bag barrel 5041 are respectively arranged in the left chamber and the right chamber through the partition plates, the left chamber and the right chamber are not communicated with each other, when a part of cloth bag barrels need to be cleaned, the conveying of smoke in the left chamber is stopped, the conveying of smoke in the right chamber is kept, the first-stage cloth bag barrel 5031 and the second-stage cloth bag barrel 5041 arranged in the left chamber are cleaned and maintained, after the maintenance is completed, the left chamber is sealed again, the smoke conveying is carried out on the cloth bag barrels arranged in the left chamber again, the smoke conveying of the right chamber is stopped, and the first-stage cloth bag barrel 5031 and the second-stage cloth bag barrel 5041 in the right chamber are cleaned and maintained. Through the circulation of the above processes, the cleaning of the primary cloth bag barrel 5031 and the secondary cloth bag barrel 5041 is realized, and the influence on the flue gas cleaning flow is small.

Preferably, in order to further improve the utilization rate of the flue gas heat, a primary heat exchange tube 16 is disposed in the primary bag drum 5031, a secondary heat exchange tube 17 is disposed in the secondary bag drum 5041, the primary heat exchange tube 16 and the secondary heat exchange tube 17 are all mounted on the housing box 501, the primary heat exchange tube 16 is disposed in parallel on the outer peripheral side of the secondary bag drum 5041, and the primary heat exchange tube 16 and the secondary heat exchange tube 17 are heat exchange tubes for absorbing and utilizing the flue gas heat.

Preferably, the smoke inlet pipe 502, the primary pulse pipe 5032 and the primary heat exchange pipe 16 are all arranged through the hole plate 5033, the smoke inlet pipe 502 is arranged in the middle of the primary cloth bag barrel 5031, and the primary pulse pipe 5032 and the primary heat exchange pipe 16 are respectively and closely arranged at two sides of the smoke inlet pipe 502.

The secondary heat exchange tube 17 mainly relies on the clean flue gas entering the secondary cloth bag barrel 5041 to absorb heat, even release heat, and the primary heat exchange tube 16 mainly relies on the flue gas inlet pipeline 502 to absorb heat, so that the heat can be absorbed by the flue gas purified for the first time, and heat loss is prevented.

In this embodiment, the bottoms of the primary bag-type canister 5031 and the secondary bag-type canister 5041 are sealed, and the end of the smoke inlet pipe 502 is disposed in the housing box 501 through the bottom of the primary bag-type canister 5031.

In this embodiment, the housing box 501 is divided into an upper cavity 19 and a lower cavity 18 by the orifice plate 5033, the first-stage bag-type tube 5031 is disposed in the lower cavity 18, the second-stage bag-type tube 5041 is disposed in the upper cavity 19, and a feeding fan 20 is connected between the upper cavity 19 and the lower cavity 18.

The feeding fan 20 comprises two air distribution pipes and an air exhaust pipe, the air exhaust pipe is arranged on the upper cavity 19, the two air distribution pipes are respectively arranged on the lower cavity 18 and the upper cavity 19, the feeding fan 20 respectively inputs the deacidification auxiliary materials which are supplemented outside and are mixed with primary clean smoke in the upper cavity 19 into the lower cavity 18 and the upper cavity 19 through the air exhaust pipe, different deacidification auxiliary materials are adsorbed on the cloth bag barrel through feeding, chemical deacidification can be carried out on smoke permeated into the cloth bag barrel, and because the deacidification auxiliary materials are different in deacidification reaction when reacting with the smoke, the required temperature is different, the deacidification reaction requiring lower heat is adopted in the lower cavity 18, the deacidification reaction requiring higher heat is adopted in the upper cavity 19, and the utilization rate of energy is improved.

The feeding fan 20 can adopt an air suspension or magnetic suspension fan, so that the air quantity is large, the efficiency is high, and the feeding effect is improved.

Because two-stage cloth bags are adopted, the resistance is increased compared with that of a single-stage cloth bag, the power of the main induced draft fan is high, the main induced draft fan can be driven by steam-driven and electric double-power, the electric detection adopts magnetic coupling transmission, the steam-driven part can also adopt a main machine to be directly connected through a magnetic coupler of a speed reducer, and the fan adopts an efficient energy-saving fan to overcome the influence caused by the increase of the resistance of smoke.

Preferably, a carbon capturing device can be further arranged at the clean flue gas outlet of the housing cavity 501, the purified gas containing carbon dioxide is captured into equipment, and the carbon dioxide is processed into deacidification auxiliary materials to return to the purification system.

Preferably, a plurality of ash baffles 21 are arranged on the pore plate 5033, the ash baffles 21 are arranged at the bottom of the secondary cloth bag barrel 5041 and are arranged between every two holes, an ash discharge valve 22 is arranged at the bottom of each ash baffle 21, smoke holes 26 for circulating primary purified smoke are arranged on the vertical edges of the ash baffles 21, and the primary purified smoke flows into the upper cavity 19 from the lower cavity 18 through the smoke holes 26.

The ash blocking plates 21 are two symmetrically arranged plates and are used for preventing dust in the plates from falling into the first-stage cloth bag barrel 5031, a small opening is reserved at the tail end of the plate obliquely to the side edge, dust outside the second-stage cloth bag barrel 5041 flows out from the small opening through the drainage of the ash discharging valve 22, and the ash discharging valve 22 is used for preventing flue gas in the first-stage cloth bag barrel 5031 from directly flowing into the upper cavity 19 before primary purification.

Preferably, both ends of the orifice 5033 are provided with ash hoppers, and the ash discharge valve 22 is disposed below the ash hoppers. Because the interior of the upper cavity 19 is in a negative pressure environment, dust is difficult to fall from the dust discharging valve 22, the bottom of the dust blocking plate 21 can be sealed, an air pump pipeline is arranged in the dust blocking plate 21 and used for conveying compressed air to the dust blocking plate 21, so that the dust is transversely blown onto the orifice 5033 and blown to the dust hopper by wind force, a large amount of dust is concentrated to the dust hopper, the dust discharging valve 22 is opened, and the dust is concentrated to fall.

Preferably, in order to facilitate the operator to shuttle between the cloth bag barrels for maintaining and replacing the cloth bag assembly, the first-stage cloth bag barrel 5031 and the second-stage cloth bag barrel 5041 are divided into two cloth bag barrels with different lengths, and the cloth bag barrels with the two lengths are alternately arranged respectively. As shown in fig. 6, in one arrangement mode of the cloth bag assembly, a long first-stage cloth bag barrel 5031 is arranged below a short second-stage cloth bag barrel 5041, and is continuously provided with two rows, when the cloth bag assembly is arranged in a third row, the short first-stage cloth bag barrel 5031 is arranged below the long second-stage cloth bag barrel 5041, and is continuously provided with two rows, and the cloth bag barrels are alternately arranged according to the above mode, so that an installation gap between the cloth bag barrels is enlarged, and the cloth bag barrels are convenient for workers to shuttle in to maintain and replace.

Through the flue gas circulation device of the garbage incinerator, the generation of nitrogen oxides in the incinerator can be reduced, the temperature of a main drying area of the boiler is increased, the drying efficiency is improved, the flue gas waste heat loss is reduced, and the use of a denitration agent is reduced; and this device can also refine the flue gas deacidification process, provides multistage deacidification environment, improves flue gas purification effect and efficiency.

The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements may be made to the present application by those skilled in the art, which modifications and equivalents are also considered to be within the scope of the present application.

Claims (6)

1. The flue gas circulation device of the garbage incinerator is characterized by comprising the incinerator (1), an integrated flue (2), an economizer (3) and a flue gas circulation pipeline (6);

the flue gas circulation pipeline (6) comprises a first circulation flue (601) and a second circulation flue (602), the first circulation flue (601) is used for communicating the economizer (3) with a flue outlet of the incinerator (1), and the second circulation flue (602) is used for communicating a dust outlet of the incinerator (1) with a drying section of the incinerator (1);

the incinerator (1) comprises a hearth (101), a material inlet (102) and a slag outlet (103) are respectively arranged at the left end and the right end of the hearth (101), a fire grate (104) is arranged in the hearth (101), and an air outlet (105) is arranged at the joint of the hearth (101) and the integrated flue (2);

the two sides of the air outlet (105) are respectively provided with a front arch (106) and a rear arch (107) which shrink inwards, and the front arch (106) and the tip of the rear arch (107) are oppositely arranged;

the first circulating flue (601) is arranged on the outer side of the hearth (101) and connects the economizer (3) with the air outlet (105), and the second circulating flue (602) is arranged on the outer side of the hearth (101) and communicates the slag outlet (103) with the material inlet (102).

2. The garbage incinerator flue gas circulation device according to claim 1, wherein the first circulation flue (601) comprises a first exhaust pipe (6011) and a first air outlet pipe (6012), the first exhaust pipe (6011) is connected with the first air outlet pipe (6012) through an integrated circulation fan (7), the first exhaust pipe (6011) is communicated with a flue outlet of the economizer (3), the first air outlet pipe (6012) is communicated with the air outlet (105) through a three-way flue pipe (8), and the integrated circulation fan (7) performs negative pressure suction on the first exhaust pipe (6011) so that flue gas flowing out of the economizer (3) enters the air outlet (105) from the first air outlet pipe (6012).

3. A waste incinerator flue gas recirculation arrangement according to claim 2, characterized in that two of the passages of the three-way flue pipe (8) are arranged at the front arch (106) and the rear arch (107), respectively.

4. A waste incinerator flue gas circulation device according to claim 2, characterized in that the first exhaust pipe (6011) is provided with a high temperature bag-type dust collector (9), and the high temperature bag-type dust collector (9) is arranged between the integrated circulation fan (7) and the economizer (3).

5. The flue gas circulation device of a garbage incinerator according to claim 2, wherein the second circulation flue (602) comprises a second exhaust pipe (6021) and a second air outlet pipe (6022) communicated with the second exhaust pipe (6021) through the integrated circulation fan (7), the second exhaust pipe (6021) is communicated with the slag outlet (103), the second air outlet pipe (6022) is communicated with the material inlet (102), and the integrated circulation fan (7) performs negative pressure suction on the second exhaust pipe (6021) so that gas at the slag outlet (103) enters the bottom of the material inlet (102) from the second exhaust pipe (6021).

6. A waste incinerator flue gas circulation device according to claim 5, wherein the second air outlet pipe (6022) penetrates through the hearth (101) and is connected with a blowing pipe (10), and the blowing direction of the blowing pipe (10) is opposite to the waste discharging direction of the material port (102) in the hearth (101).

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