CN111001250A - Improved low-low temperature electric precipitation desulfurization combined process - Google Patents

Improved low-low temperature electric precipitation desulfurization combined process Download PDF

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Publication number
CN111001250A
CN111001250A CN201911333103.9A CN201911333103A CN111001250A CN 111001250 A CN111001250 A CN 111001250A CN 201911333103 A CN201911333103 A CN 201911333103A CN 111001250 A CN111001250 A CN 111001250A
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China
Prior art keywords
flue gas
area
dust remover
heat exchanger
particle bed
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CN201911333103.9A
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Chinese (zh)
Inventor
金建祥
陈蕾
赵文霞
孙红兴
杨影
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Yancheng Institute of Technology
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Yancheng Institute of Technology
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Priority to CN201911333103.9A priority Critical patent/CN111001250A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D50/00Combinations of devices for separating particles from gases or vapours
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/30Particle separators, e.g. dust precipitators, using loose filtering material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D49/00Separating dispersed particles from gases, air or vapours by other methods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D51/00Auxiliary pretreatment of gases or vapours to be cleaned
    • B01D51/02Amassing the particles, e.g. by flocculation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides

Abstract

An improved low-low temperature electric precipitation desulfurization combined process is an improvement on the low-low temperature electric precipitation desulfurization combined process by combining a granular bed dust remover and a pipeline condenser; the combined process comprises a denitration device, a first heat exchanger, a granular bed dust remover, a second heat exchanger, a carbon adsorption condenser, an electric dust remover, a first induced draft fan, a desulfurization tower, a third heat exchanger, a second induced draft fan and a chimney which are sequentially connected through an air pipe. The invention provides a combined process with different concepts, the process route is optimized, and the composition is reasonable.

Description

Improved low-low temperature electric precipitation desulfurization combined process
Technical Field
The invention belongs to the field of flue gas dust removal treatment, and relates to an electric dust removal and desulfurization combined process.
Background
The development and application of the high-temperature gas high-efficiency dust removal technology have important significance for improving the energy utilization efficiency of the industrial process and realizing clean production. The existing high-temperature gas dust removal technology mainly comprises cyclone dust removal, electric dust removal, ceramic filtration, metal filtration, particle bed filtration and the like. In the 20 th century and the 50 th century, Granular bed filters (GBF, Granular bed for short) utilize Granular materials with very stable physical and chemical properties to form a Granular layer (also called filter material or filter medium) to purify dust-containing gas, and are beginning to be applied to industries such as cement, metallurgy and the like. The particle bed filtering technology has the characteristics of efficiency and pressure drop, good economical efficiency, strong severe environment adaptability and the like, provides an effective way for solving the problem of high-temperature gas purification in the fields of clean power generation, waste heat utilization and the like, and is one of the most promising high-temperature dust removal technologies.
The particle bed dust removal filter has the problems of low filtering gas speed, high pressure drop, low superfine particle removal rate and the like, and according to the current research situation, the main improvement research and development of the fixed bed mainly comprises ① prolonging the filtering operation time, increasing the dust containing amount of a particle layer (a multilayer filter material fixed bed) and designing a continuously operable fixed bed (a novel fixed bed), ② improving the superfine dust collection efficiency (a powder filter material fixed bed), ③ improving the filtering gas speed and reducing the filtering pressure drop.
In the conventional low-low temperature dust removal and desulfurization process, rapid condensation occurs in a desulfurization tower, and slow condensation occurs when flue gas is gradually cooled to below an acid dew point through a non-contact heat exchanger.
Therefore, in order to solve the above problems, it is necessary to research and improve the low-temperature dust removal and desulfurization process based on the prior art, and use a particle bed dust remover and a pipeline condenser to enhance the removal efficiency of the ultra-fine particles in the whole process and reduce the condensation of the sulfuric acid vapor under the low-temperature condition.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects in the prior art and provides an improved low-temperature dust removal and desulfurization process.
The technical scheme is as follows: in order to achieve the object of the present invention, the present invention adopts the following technical solutions.
1. An improved low-low temperature electric precipitation desulfurization combined process is an improvement on the low-low temperature electric precipitation desulfurization combined process by combining a granular bed dust remover and a pipeline condenser; the combined process comprises a denitration device, a first heat exchanger, a granular bed dust remover, a second heat exchanger, a carbon adsorption condenser, an electric dust remover, a first induced draft fan, a desulfurization tower, a third heat exchanger, a second induced draft fan and a chimney which are sequentially connected through an air pipe;
the combined process comprises the following operation steps:
(1) flue gas generated by the boiler enters a denitration device, exchanges heat through a first heat exchanger, is cooled, and then enters a particle bed dust remover;
(2) the particle bed dust remover removes dust by using filter material particles; the main body of the particle bed dust remover consists of an air inlet pipe, a particle bed area, a sieve plate, an internal circulation area and an air outlet pipe, wherein the sieve plate divides the particle bed dust remover into an upper layer and a lower layer; the particle bed area and the internal circulation area are respectively positioned at the upper layer and the lower layer of the dust remover; the inlet pipe is communicated with the internal circulation area, a first heat exchanger is arranged at the starting end of the inlet pipe, an air inlet is arranged at the tail end of the inlet pipe, and flue gas enters the internal circulation area from the air inlet after being cooled by the first heat exchanger; the inner circulation zone is provided with two partition plates, the upper part of the inner circulation zone is provided with a backflushing gas pipe, the outer sides of the partition plates of the inner circulation zone are provided with fourth heat exchangers, and flue gas on the outer sides of the two partition plates of the inner circulation zone is cooled and then downwards reaches the position of a gas inlet and is upwards mixed with the flue gas in the gas inlet pipe, so that the flue gas on the outer sides of the two partition plates forms inner circulation; the particle bed area is provided with a filter material to form a particle bed and filter smoke, the lower part of the particle bed area is provided with a sieve plate, and the sieve plate is provided with an opening, so that airflow in the internal circulation area smoothly enters the particle bed area, and the filter material in the particle bed area is kept on the sieve plate; the gas outlet pipe is communicated with the particle bed area, the upper part of the particle bed area is provided with a rectifying baffle plate and a fifth heat exchanger, the flue gas enters the gas outlet pipe after passing through the rectifying baffle plate and the fifth heat exchanger, and the fifth heat exchanger has a heating effect on the flue gas passing through the rectifying baffle plate; the lower part of the internal circulation particle bed dust remover is provided with an ash bucket and an ash cleaning valve;
(3) after the flue gas of the air outlet pipe of the particle bed dust remover is cooled by the second heat exchanger, the flue gas enters a carbon-attached condenser, and the carbon-attached condenser is in a pipeline type; the condenser consists of a charged area, a carbon box and a condensing area, the charged area is provided with a group of parallel channels with positive and negative phases, and dust particles in the flue gas enter the condensing area after being charged; 4-6 groups of ascending or descending channels are arranged in the condensation area, and the condensed flue gas enters a main body dust remover for treatment; the carbon box can be pushed into or pulled out from the opening, honeycomb-shaped activated carbon is filled in the carbon box and fixed, and the carbon box is pulled out to replace the activated carbon after the filled activated carbon absorbs particles and is saturated;
(4) the condensed dust-containing flue gas enters an electric dust remover through a pipeline for dust removal treatment, dust is charged in the dust remover and is settled in an ash bucket under the action of electric field force, dust particles are removed from the flue gas, and the flue gas is purified;
(5) the flue gas treated by the electric dust remover is sent into a desulfurizing tower through a first induced draft fan, and SO in the flue gas is mainly removed2
(6) And heating and warming the desulfurized flue gas by a third heat exchanger, wherein the used heat comes from a second heat exchanger, and the purified flue gas reaching the emission standard is discharged from a chimney by a second induced draft fan.
Has the advantages that: compared with the prior art, the invention has the following beneficial effects.
1. The invention provides a combined process with different concepts.
2. The process route is optimized, the composition is reasonable, the granular bed dust remover, the carbon adhesion condenser and the low-low temperature electric dust removal desulfurization process are combined in order and organically, and the main sections are matched and supplemented with each other; the particle bed dust remover filters and intercepts particles, so that the running load of the electric dust remover is reduced; the heat exchange causes low temperature, and is beneficial to the reinforced adsorption of honeycomb activated carbon S0 in the pipeline type condenser3Acid mist avoidance of S03Acid mist in subsequent working sectionCorrosion of plumbing equipment; the carbon-attached condenser also strengthens the condensation of PM2.5, and is beneficial to the removal in an electric dust collector. .
3. The circulating power in the granular bed comes from self heat difference, the waste heat of the flue gas is utilized, and the energy is saved; the second heat exchanger cools down the flue gas that gets into the carbon and attaches the condenser, and the third heat exchanger heats the lifting to the flue gas after low temperature, and used heat comes from the second heat exchanger.
4. The flue gas in the lower layer internal circulation area of the particle bed dust remover is continuously circulated, and ultrafine particles in the flue gas are continuously collided and greatly bonded, so that the removal rate of the dust remover to PM2.5 is improved. The carbon-attached condenser also strengthens the condensation of PM2.5, and is beneficial to the removal in an electric dust collector. The process provided by the invention can effectively treat the boiler flue gas, can obtain a good treatment effect, meets the requirement on environmental protection, and has a total removal rate of TSP (Total suspended particulate) of more than 99.9 percent.
Drawings
FIG. 1 is a flow chart of an improved low-low temperature electric precipitation desulfurization combined process provided by the invention.
Detailed Description
The invention is further elucidated with reference to the drawings and the embodiments.
Example 1
The treatment gas amount of the flue gas of a certain boiler is 100000m3And h, treating by adopting an improved low-low temperature electric precipitation desulfurization combined process.
The specific scheme is as follows:
an improved low-low temperature electric precipitation and desulfurization combined process is adopted for treatment, and the combined process is an improvement on the low-low temperature electric precipitation and desulfurization combined process by combining a granular bed dust remover and a pipeline condenser; the combined process comprises a denitration device, a first heat exchanger, a granular bed dust remover, a second heat exchanger, a carbon adsorption condenser, an electric dust remover, a first induced draft fan, a desulfurization tower, a third heat exchanger, a second induced draft fan and a chimney which are sequentially connected through an air pipe; the combined process comprises the following operation steps:
(1) flue gas generated by the boiler enters a denitration device, exchanges heat through a first heat exchanger, is cooled, and then enters a particle bed dust remover;
(2) the particle bed dust remover removes dust by using filter material particles; the main body of the particle bed dust remover consists of an air inlet pipe, a particle bed area, a sieve plate, an internal circulation area and an air outlet pipe, wherein the sieve plate divides the particle bed dust remover into an upper layer and a lower layer; the particle bed area and the internal circulation area are respectively positioned at the upper layer and the lower layer of the dust remover; the inlet pipe is communicated with the internal circulation area, a first heat exchanger is arranged at the starting end of the inlet pipe, an air inlet is arranged at the tail end of the inlet pipe, and flue gas enters the internal circulation area from the air inlet after being cooled by the first heat exchanger; the inner circulation zone is provided with two partition plates, the upper part of the inner circulation zone is provided with a backflushing gas pipe, the outer sides of the partition plates of the inner circulation zone are provided with fourth heat exchangers, and flue gas on the outer sides of the two partition plates of the inner circulation zone is cooled and then downwards reaches the position of a gas inlet and is upwards mixed with the flue gas in the gas inlet pipe, so that the flue gas on the outer sides of the two partition plates forms inner circulation; the particle bed area is provided with a filter material to form a particle bed and filter smoke, the lower part of the particle bed area is provided with a sieve plate, and the sieve plate is provided with an opening, so that airflow in the internal circulation area smoothly enters the particle bed area, and the filter material in the particle bed area is kept on the sieve plate; the gas outlet pipe is communicated with the particle bed area, the upper part of the particle bed area is provided with a rectifying baffle plate and a fifth heat exchanger, the flue gas enters the gas outlet pipe after passing through the rectifying baffle plate and the fifth heat exchanger, and the fifth heat exchanger has a heating effect on the flue gas passing through the rectifying baffle plate; the lower part of the internal circulation particle bed dust remover is provided with an ash bucket and an ash cleaning valve;
(3) after the flue gas of the air outlet pipe of the particle bed dust remover is cooled by the second heat exchanger, the flue gas enters a carbon-attached condenser, and the carbon-attached condenser is in a pipeline type; the condenser consists of a charged area, a carbon box and a condensing area, the charged area is provided with a group of parallel channels with positive and negative phases, and dust particles in the flue gas enter the condensing area after being charged; 4-6 groups of ascending or descending channels are arranged in the condensation area, and the condensed flue gas enters a main body dust remover for treatment; the carbon box can be pushed into or pulled out from the opening, honeycomb-shaped activated carbon is filled in the carbon box and fixed, and the carbon box is pulled out to replace the activated carbon after the filled activated carbon absorbs particles and is saturated;
(4) the condensed dust-containing flue gas enters an electric dust remover through a pipeline for dust removal treatment, dust is charged in the dust remover and is settled in an ash bucket under the action of electric field force, dust particles are removed from the flue gas, and the flue gas is purified;
(5) the flue gas treated by the electric dust remover is sent into a desulfurizing tower through a first induced draft fan, and SO in the flue gas is mainly removed2
(6) And heating and warming the desulfurized flue gas by a third heat exchanger, wherein the used heat comes from a second heat exchanger, and the purified flue gas reaching the emission standard is discharged from a chimney by a second induced draft fan.
The main body of the particle bed dust remover consists of an air inlet pipe, a particle bed area, a sieve plate, an internal circulation area and an air outlet pipe, wherein the sieve plate divides the particle bed dust remover into an upper layer and a lower layer; the particle bed area and the internal circulation area are respectively positioned at the upper layer and the lower layer of the dust remover; the inlet pipe is communicated with the internal circulation area, a first heat exchanger is arranged at the starting end of the inlet pipe, an air inlet is arranged at the tail end of the inlet pipe, and flue gas enters the internal circulation area from the air inlet after being cooled by the first heat exchanger; the inner circulation zone is provided with two partition plates, the upper part of the inner circulation zone is provided with a backflushing gas pipe, the outer sides of the partition plates of the inner circulation zone are provided with fourth heat exchangers, and flue gas on the outer sides of the two partition plates of the inner circulation zone is cooled and then downwards reaches the position of a gas inlet and is upwards mixed with the flue gas in the gas inlet pipe, so that the flue gas on the outer sides of the two partition plates forms inner circulation; the particle bed area is provided with a filter material to form a particle bed and filter smoke, the lower part of the particle bed area is provided with a sieve plate, and the sieve plate is provided with an opening, so that airflow in the internal circulation area smoothly enters the particle bed area, and the filter material in the particle bed area is kept on the sieve plate; the gas outlet pipe is communicated with the particle bed area, the upper part of the particle bed area is provided with a rectifying baffle plate and a fifth heat exchanger, the flue gas enters the gas outlet pipe after passing through the rectifying baffle plate and the fifth heat exchanger, and the fifth heat exchanger has a heating effect on the flue gas passing through the rectifying baffle plate; the lower part of the internal circulation particle bed dust remover is provided with an ash bucket and an ash cleaning valve. In the embodiment, the filter material of the granular bed dust remover adopts ceramic granules, and the grain size range is 3-5 mm; the filtration rate in the granular bed region was 0.3 m/s.
The carbon-attached condenser is in a pipeline type; the condenser consists of a charged area, a carbon box and a condensing area, the charged area is provided with a group of parallel channels with positive and negative phases, and dust particles in the flue gas enter the condensing area after being charged; 4 groups of ascending or descending channels are arranged in the condensation area, and the condensed flue gas enters a main body dust remover for treatment; the charcoal box can push in or take out through the opening part, fill honeycomb active carbon in the charcoal box, fix, treat that the active carbon adsorption particulate matter that fills after saturation, take out the charcoal box, replace the active carbon. The flue gas in the lower layer internal circulation area of the particle bed dust remover is continuously circulated, and ultrafine particles in the flue gas are continuously collided and greatly bonded, so that the removal rate of the dust remover to PM2.5 is improved. The carbon-attached condenser also strengthens the condensation of PM2.5, and is beneficial to the removal in an electric dust collector. The combined process provided by the invention can effectively treat the boiler flue gas, can obtain a good treatment effect, meets the requirement on environmental protection, and has a total removal rate of TSP (Total suspended particulate) of more than 99.9%.

Claims (1)

1. An improved low-low temperature electric precipitation desulfurization combined process is characterized in that: the combined process is an improvement of the low-low temperature electric precipitation and desulfurization combined process by combining a granular bed dust remover and a pipeline condenser; the combined process comprises a denitration device, a first heat exchanger, a granular bed dust remover, a second heat exchanger, a carbon adsorption condenser, an electric dust remover, a first induced draft fan, a desulfurization tower, a third heat exchanger, a second induced draft fan and a chimney which are sequentially connected through an air pipe;
the combined process comprises the following operation steps:
(1) flue gas generated by the boiler enters a denitration device, exchanges heat through a first heat exchanger, is cooled, and then enters a particle bed dust remover;
(2) the particle bed dust remover removes dust by using filter material particles; the main body of the particle bed dust remover consists of an air inlet pipe, a particle bed area, a sieve plate, an internal circulation area and an air outlet pipe, wherein the sieve plate divides the particle bed dust remover into an upper layer and a lower layer; the particle bed area and the internal circulation area are respectively positioned at the upper layer and the lower layer of the dust remover; the inlet pipe is communicated with the internal circulation area, a first heat exchanger is arranged at the starting end of the inlet pipe, an air inlet is arranged at the tail end of the inlet pipe, and flue gas enters the internal circulation area from the air inlet after being cooled by the first heat exchanger; the inner circulation zone is provided with two partition plates, the upper part of the inner circulation zone is provided with a backflushing gas pipe, the outer sides of the partition plates of the inner circulation zone are provided with fourth heat exchangers, and flue gas on the outer sides of the two partition plates of the inner circulation zone is cooled and then downwards reaches the position of a gas inlet and is upwards mixed with the flue gas in the gas inlet pipe, so that the flue gas on the outer sides of the two partition plates forms inner circulation; the particle bed area is provided with a filter material to form a particle bed and filter smoke, the lower part of the particle bed area is provided with a sieve plate, and the sieve plate is provided with an opening, so that airflow in the internal circulation area smoothly enters the particle bed area, and the filter material in the particle bed area is kept on the sieve plate; the gas outlet pipe is communicated with the particle bed area, the upper part of the particle bed area is provided with a rectifying baffle plate and a fifth heat exchanger, the flue gas enters the gas outlet pipe after passing through the rectifying baffle plate and the fifth heat exchanger, and the fifth heat exchanger has a heating effect on the flue gas passing through the rectifying baffle plate; the lower part of the internal circulation particle bed dust remover is provided with an ash bucket and an ash cleaning valve;
(3) after the flue gas of the air outlet pipe of the particle bed dust remover is cooled by the second heat exchanger, the flue gas enters a carbon-attached condenser, and the carbon-attached condenser is in a pipeline type; the condenser consists of a charged area, a carbon box and a condensing area, the charged area is provided with a group of parallel channels with positive and negative phases, and dust particles in the flue gas enter the condensing area after being charged; 4-6 groups of ascending or descending channels are arranged in the condensation area, and the condensed flue gas enters a main body dust remover for treatment; the carbon box can be pushed into or pulled out from the opening, honeycomb-shaped activated carbon is filled in the carbon box and fixed, and the carbon box is pulled out to replace the activated carbon after the filled activated carbon absorbs particles and is saturated;
(4) the condensed dust-containing flue gas enters an electric dust remover through a pipeline for dust removal treatment, dust is charged in the dust remover and is settled in an ash bucket under the action of electric field force, dust particles are removed from the flue gas, and the flue gas is purified;
(5) the flue gas treated by the electric dust remover is sent into a desulfurizing tower through a first induced draft fan, and SO in the flue gas is mainly removed2
(6) And heating and warming the desulfurized flue gas by a third heat exchanger, wherein the used heat comes from a second heat exchanger, and the purified flue gas reaching the emission standard is discharged from a chimney by a second induced draft fan.
CN201911333103.9A 2019-12-23 2019-12-23 Improved low-low temperature electric precipitation desulfurization combined process Pending CN111001250A (en)

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CN109973989A (en) * 2019-04-04 2019-07-05 东北大学 A kind of equipment improving low-level (stack-gas) economizer abrasion

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