CN201320436Y - Bag-type dust remover - Google Patents

Abstract

The utility model relates to a cloth bag dust collector, which comprises a dust removal device and a reaction aid supply device; the dust removal device includes a dust collector body and an ash hopper; an air inlet provided on the side wall of the ash hopper is connected with an air inlet pipe; There is an air outlet on the side wall of the upper part of the main body, and a partition plate is provided on the cross-section of the dust collector body, and a filter cage is installed in the installation hole on the partition plate, and a dust bag is set outside the filter cage; the reaction aid The supply device includes a slaked lime storage tank and a reaction aid storage tank, the screw conveyor at the lower part of the slaked lime storage tank and the reaction aid storage tank is connected to the tee, the tee is connected to the reaction agent injector, and the injection port of the reaction agent injector is connected to the agent The delivery pipeline is connected, and one end of the chemical injection pipeline is connected with the Roots blower, and the other end is connected with the air intake pipeline. The bag dust collector described in the utility model can remove toxic and harmful gases from waste incinerator tail gas up to 95%, and has the advantages of low operating cost and long service life.

Description

Bag filter

(1) Technical field:

The utility model relates to a boiler tail gas treatment device, in particular to a bag filter.

(two) background technology:

Now, waste incineration power generation has become the main way to deal with domestic waste in developed countries, and some developed cities in my country have also begun to use waste incineration for power generation. However, the waste incinerator tail gas contains a large amount of acid gases such as hydrogen chloride and sulfur dioxide, and toxic and harmful components such as dioxins and heavy metals, which must be treated. At present, the treatment of waste incinerator tail gas in China mainly adopts semi-dry method, which is a method of absorbing toxic and harmful components with lime slurry. The semi-dry method has the following problems: 1. The lime slurry production system is complicated and the investment cost is high. 2. The loss of lime slurry conveying and spraying system is serious, and the energy consumption is also high, resulting in high operating cost. 3. Due to the use of lime slurry, it is easy to cause fouling and blockage of the reaction tower and flue. 4. The use of lime slurry is also easy to cause compaction on the surface of the bag, which affects the flow of gas. 5. Since the lime slurry in the neutralization reaction and the toxic and harmful components in the tail gas are carried out in a flowing state in the reaction tower, the collision probability is small, and the absorption rate of the toxic and harmful components is low. 6. Too long residence time between 200°C and 240°C where the secondary generation of dioxins occurs is likely to cause the secondary generation of dioxins.

(3) Contents of the invention:

The purpose of the utility model is to provide a bag filter for waste incinerator tail gas treatment with low operating cost, long service life and good absorption effect on toxic and harmful components.

In order to achieve the above purpose, the bag dust collector described in the utility model includes a dust removal device and a reaction aid supply device; the dust removal device includes a dust collector body with a cavity inside and a cavity fixedly installed under the dust collector body and the dust collector body The ash hopper is connected in the shape of an inverted frustum; the side wall of the ash hopper is provided with an air inlet and a maintenance hole, and the air inlet on the side wall of the ash hopper is connected with the air inlet pipe; the lower part of the ash hopper is provided with an ash outlet. The ash outlet at the lower part of the ash hopper communicates with the spiral dust discharger and is fixedly connected; an air outlet is provided on the side wall of the upper part of the dust collector body, and a partition plate is provided on the cross-section of the inner cavity of the dust collector body below the air outlet The partition plate divides the cavity of the dust collector body into upper and lower chambers. There are several installation holes evenly arranged horizontally and vertically on the partition board, and several tubular porous filter cages are separated from the dust collector body. The cavity below the partition is installed on each installation hole, and each filter cage is covered with a dust bag; the reaction aid supply device includes a slaked lime storage tank and a reaction aid whose lower part is in the shape of an inverted cone and has an opening. The storage tank, the opening at the lower part of the slaked lime storage tank is connected to the screw conveyor, the opening at the lower part of the reaction aid storage tank is connected to the screw conveyor, and the screw conveyor under the slaked lime storage tank is opposite to the screw conveyor under the reaction aid storage tank , the outlets of the two screw conveyors are connected to the tee through pipes, the other connection port of the tee is connected to the chemical inlet of the reactive chemical injector through a pipe, and the injection port of the reactive chemical injector is connected to the middle of the chemical delivery pipeline. One end of the injection pipe is connected with the Roots blower, and the other end is connected with the intake pipe.

There is a high-pressure air bag outside the dust collector body, and several air outlets are evenly arranged on the high-pressure air bag. Each air outlet is connected with an air pressure pipe, and each air pressure pipe extends from the outside of the dust collector body to the dust collector In the cavity above the partition plate in the filter body and corresponding to the position of the installation hole on the partition plate, the port of the air pressure pipe in the dust collector body is closed, and the air pressure pipe is set toward the position of the installation hole on the partition plate. There are openings, and pulse solenoid valves are set on each air pressure pipe outside the dust collector body.

Due to the adoption of the above technical scheme, the bag filter described in the utility model sprays the highly dispersed slaked lime and the porous reaction auxiliary agent for absorbing harmful gases into the chemical delivery pipeline through the reactive agent injector and the Roots blower It is blown into the waste incinerator tail gas intake pipe and the waste incinerator tail gas is highly mixed and enters the cavity at the lower part of the bag filter, which increases the contact area between slaked lime and reaction aids and the waste incinerator tail gas, and improves the efficiency of waste incineration. The absorption effect of toxic and harmful gases in the exhaust gas of the waste incinerator can effectively absorb acid gases such as hydrogen chloride and sulfur dioxide and toxic and harmful components such as dioxins and heavy metals in the exhaust gas of the waste incinerator, and the removal efficiency of toxic and harmful gases in the exhaust gas of the waste incinerator It can reach 95%, and has the advantages of low operating cost and long service life.

(4) Description of drawings:

Fig. 1 is a schematic diagram of the front structure of the bag filter described in the utility model;

Fig. 2 is a top view enlarged structural schematic diagram of the dust removal device in the bag filter shown in Fig. 1;

Fig. 3 is a right view structural diagram of the dust removal device in the bag filter shown in Fig. 1;

Fig. 4 is a partially enlarged structural schematic diagram of the dust bag part of the bag filter shown in Fig. 1 .

(5) Specific implementation methods:

Below in conjunction with embodiment the utility model is described in further detail.

It can be seen from Fig. 1, Fig. 2, Fig. 3 and Fig. 4 that the bag filter of the present invention includes a dust removal device and a reaction aid supply device; Under the body 1 of the dust collector, there is an inverted frustum-shaped ash hopper 2 that communicates with the cavity of the dust collector body 1. Both the dust collector body 1 and the ash hopper 2 are installed on the bracket; the side wall of the ash hopper 2 is provided with an air inlet 4 And the maintenance hole, the maintenance hole on the side wall of the ash hopper 2 is closed by the cover plate through bolts, and is mainly used for maintenance of the bag filter; the air inlet 4 on the side wall of the ash hopper 2 is connected with the air intake pipe 5, and the air intake The pipeline 5 is generally connected with the exhaust gas pipeline of the garbage incinerator after cooling down, and can also be directly connected with the exhaust gas pipeline of the garbage incinerator; the lower part of the ash hopper 2 is provided with an ash outlet, and the ash outlet at the lower part of the ash hopper 2 is connected with the spiral dust discharge The machine 3 is connected and fixedly connected to discharge the sediment; the side wall of the upper part of the dust collector body 1 is provided with an air outlet 6, and a partition is provided on the cross-section of the inner cavity of the dust collector body 1 below the air outlet 6 Plate 7, the partition plate 7 divides the cavity of the dust collector body 1 into upper and lower chambers. On the partition plate 7, there are several installation holes 8 evenly arranged horizontally and vertically, and several tubular porous filter cages 9 is installed on each installation hole 8 from the cavity below the partition plate 7 in the dust collector body 1, and each filter cage 9 is equipped with a dust bag 10. The dust bag 10 is generally made of glass fiber and has a durable Features of high temperature and corrosion resistance; the reaction aid supply device includes a slaked lime storage tank 11 and a reaction aid storage tank 12 with an inverted frustum-shaped lower part and an opening, and the slaked lime storage tank 11 and the reaction aid storage tank 12 are installed on On the support; Lime water is stored in the slaked lime storage tank 11, that is, an aqueous solution of calcium hydroxide, which is mainly used to absorb acid gases such as hydrogen chloride and sulfur dioxide; Porous substances with large and small specific gravity are generally porous and highly absorbent substances such as activated carbon powder and diatomaceous earth, which are mainly used to absorb toxic and harmful components such as dioxins and heavy metals; connection, the opening at the bottom of the reaction aid storage tank 12 is connected to the screw conveyor 14, the screw conveyors at the bottom of the slaked lime storage tank 11 and the reaction aid storage tank 12 can be set separately, or a two-axis two-way screw conveyor can be used. The screw conveyor 13 under the slaked lime storage tank 11 is opposite to the screw conveyor 14 under the reaction aid storage tank 12. The outlets of the two screw conveyors 13 and 14 are connected to the tee through a pipe, and the other connection port of the tee is The pipe is connected to the chemical inlet of the reaction agent injector 15, and the injection port of the reaction agent injector 15 is communicated with the middle part of the agent delivery pipeline. One end of the pipe is connected to the Roots blower 16, and the other end is connected to the air intake pipe 5. Because the Roots blower 15 has a strong air supply capacity, the Roots blower 16 can blow the slaked lime and reaction aids entering the chemical delivery pipeline at a high speed. into the air intake pipe 5 and fully mixed with the waste incinerator tail gas.

After a period of work, as the amount of slaked lime and reaction aids continues to increase, the failed slaked lime, reaction aids and the mixture absorbed by it will form a layer of scale on the surface of the dust bag 10, which will affect the performance of the dust bag 10. Air permeability hinders the smooth flow of waste incinerator exhaust, and also reduces the ability of slaked lime and reaction aids to absorb toxic and harmful gases in waste incinerator exhaust. The outside of the main body 1 is provided with a high-pressure air bag 17, which is connected with an air compressor, and several air outlets are evenly arranged on the high-pressure air bag 17, and each air outlet is connected with an air pressure pipe 18, and each air pressure pipe 18 is Extend from the outside of the dust collector body 1 into the cavity above the partition plate 7 in the dust collector body 1 and correspond to the position of the installation hole 8 on the partition plate 7, the port of the air pressure pipe 18 in the dust collector body 1 It is closed, and the air pressure pipe 18 is provided with an opening 19 toward the position of the mounting hole 8 on the partition plate 7. Each air pressure pipe 18 outside the dust collector body 1 is provided with a pulse solenoid valve 20, and the pulse can be controlled by the circuit. The opening and closing of the electromagnetic valve 20 is controlled.

During work, before the waste incinerator tail gas enters the bag filter from the air inlet 4 on the side wall of the ash hopper 2 through the air intake pipe 5, because the air inlet pipe 5 is connected with the medicament delivery pipe, the waste incinerator tail gas has been connected with the dust collector from the waste incinerator. A certain amount of slaked lime and reaction aids that enter the chemical delivery pipeline are fully mixed, and the amount of slaked lime and reaction aids can be set according to the amount of exhaust gas from the waste incinerator, and the lower part of the slaked lime storage tank 11 and the reaction aid storage tank 12 is controlled by the circuit The conveying speed of the screw conveyors 13 and 14 is realized; the slaked lime and the reaction aid enter the tee through the pipeline through the screw conveyor 13 and 14 from the lower part of the slaked lime storage tank 11 and the reaction aid storage tank 12, and enter the reaction from the tee. The medicament inlet of the medicament injector 15, the slaked lime and the reaction aid are sprayed into the middle of the medicament delivery pipe through the injection port of the medicament injector 15, and the Roots blower 16 blows the hydrated lime and the reaction aid into the intake air at high speed. The pipeline 5 is fully mixed with the waste incinerator exhaust gas, and the fully mixed waste incinerator exhaust gas, slaked lime, and reaction aid enter the dust removal device from the air inlet 4 on the side wall of the ash hopper 2 and rise into the dust collector body 1 with the air flow In the cavity below the partition plate 7, during the mixed flow process of waste incinerator exhaust gas, slaked lime, and reaction aid, due to the high degree of mixing of waste incinerator exhaust gas, slaked lime, and reaction aid, the contact surface is relatively large, and the slaked lime It reacts with most of the hydrogen chloride and sulfur dioxide in the waste incinerator tail gas to generate calcium chloride and calcium sulfite. The reaction additive absorbs most of the toxic and harmful components such as dioxins and heavy metals in the waste incinerator tail gas through its high adsorption, Simultaneously, the slaked lime and the reaction aid in the updraft will form a mixed film of slaked lime and reaction aid on the surface of the dust bag 10, and the waste incinerator exhaust gas will pass through the dust bag 10, the filter cage 9 and the partition plate 7 in sequence. When the installation hole 8 enters the cavity above the partition plate 7 in the dust collector body 1, the toxic and harmful components such as hydrogen chloride, sulfur dioxide, dioxin, and heavy metals remaining in the exhaust gas of the waste incinerator will be absorbed by the dust bag 10 when passing through the dust bag 10. The mixed film of slaked lime and reaction aid on the surface of the waste incinerator absorbs, and at the same time, the solid suspended solids in the exhaust gas of the waste incinerator are also absorbed by the mixed film of slaked lime and reaction aid, and then enter the cavity above the partition plate 7 in the dust collector body 1 The tail gas of the garbage incinerator is clean gas, and then it is discharged into the atmosphere through the gas outlet 6 on the upper side wall of the dust collector body 1.

After working for a period of time, a layer of scale will be formed on the surface of the dust bag 10 due to the mixture of invalid slaked lime, reaction additives and suspended solids absorbed by it, which affects the air permeability of the dust bag 10 and hinders the waste incinerator exhaust gas. At this time, the pulse solenoid valve 20 on each air pressure pipe 18 is opened through the control circuit, and the high-pressure gas enters the cavity above the partition plate 7 in the dust collector body 1 from the high-pressure air bag 17 through the air pressure pipe 18 and is discharged from the air pressure. The pipe 18 sprays out towards the opening 19 provided in the mounting hole 8 on the partition plate 7, and the high-pressure gas can wash down the dirt attached to the surface of the dust-removing bag 10, so that it falls off the surface of the dust-removing bag 10 and falls into the ash hopper. 2 and discharged by the spiral dust discharge machine 3. Then the bag filter can continue to carry out the dust removal work.

The amount of slaked lime and reaction aids provided by the bag filter described in the utility model can be controlled by the working speed of the screw conveyors 13 and 14; If the amount of waste incinerator tail gas to be treated is too large, multiple groups of dust removal devices can be connected in parallel to carry out the treatment simultaneously.

Claims (2)

1, a kind of sack cleaner is characterized in that: described sack cleaner comprises dust arrester and reaction promoter generator; Dust arrester comprises inner for the deduster body (1) of cavity be fixedly mounted on the ash bucket that is inversed taper platform shape (2) that communicates with the cavity of deduster body (1) under the deduster body (1); The sidewall of ash bucket (2) is provided with air inlet (4) and service hatch, and the air inlet (4) on ash bucket (2) sidewall is connected with admission line (5); The bottom of ash bucket (2) is provided with ash hole, and the ash hole of ash bucket (2) bottom is discharged machine (3) with spiral dust and communicated also fixedly connected; The sidewall on deduster body (1) top is provided with gas outlet (6), on the cross section of gas outlet (6) below deduster body (1) internal cavity, be provided with demarcation strip (7), demarcation strip (7) is divided into upper and lower two chambeies with the cavity of deduster body (1), demarcation strip (7) is gone up horizontal stroke, vertical evenly distributed several installing holes (8) that have, be installed on each installing hole (8) the outer dust-removal cloth-bag (10) that all is set with of each filter cage (9) in the cavity of several interior demarcation strip of tubular cavernous filter cage (9) Self-duster body (1) (7) belows; The reaction promoter generator comprises that the bottom all is inversed taper platform shape and is provided with the calcium hydroxide storage tank (11) and the reaction promoter storage tank (12) of opening, the opening of calcium hydroxide storage tank (11) bottom is connected with conveying worm (13), the opening of reaction promoter storage tank (12) bottom is connected with conveying worm (14), conveying worm (13) under the calcium hydroxide storage tank (11) is relative with conveying worm (14) position under the reaction promoter storage tank (12), two conveying worms (13,14) outlet is connected with threeway by pipeline, another connector of threeway is connected by the medicament inlet of pipeline with pharmacy response injector (15), the jet of pharmacy response injector (15) and drug delivery pipeline middle part are connected, medicament ejector pipeline one end is connected with Roots blower (16), and the other end is connected with admission line (5).

2, sack cleaner according to claim 1, it is characterized in that: be provided with high pressure gas bag (17) in described deduster body (1) outside, high pressure gas bag (17) is gone up evenly distributed several gas outlets that has, each gas outlet all is connected with pneumatic tube (18), each pneumatic tube (18) all extend into the cavity of the interior demarcation strip of deduster body (1) (7) top from deduster body (1) outside and is corresponding with the position of installing hole (8) on the demarcation strip (7), the port of pneumatic tube (18) in deduster body (1) is closed, the position that pneumatic tube (18) is gone up installing hole (8) towards demarcation strip (7) is provided with perforate (19), is equipped with impulse electromagnetic valve (20) on outside each pneumatic tube (18) of deduster body (1).

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