CN1435278A - Wet electrostatic flue gas dedusting process - Google Patents

Wet electrostatic flue gas dedusting process Download PDF

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Publication number
CN1435278A
CN1435278A CN 02109095 CN02109095A CN1435278A CN 1435278 A CN1435278 A CN 1435278A CN 02109095 CN02109095 CN 02109095 CN 02109095 A CN02109095 A CN 02109095A CN 1435278 A CN1435278 A CN 1435278A
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CN
China
Prior art keywords
flue gas
gas
liquid
phase
flow
Prior art date
Application number
CN 02109095
Other languages
Chinese (zh)
Inventor
庄雷
Original Assignee
庄雷
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 庄雷 filed Critical 庄雷
Priority to CN 02109095 priority Critical patent/CN1435278A/en
Publication of CN1435278A publication Critical patent/CN1435278A/en

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Abstract

A wet-electrostatic process for removing dust for flue gas includes moistening the flue gas by adding water or slurry and electrostatic removal of dust.

Description

Wet electrostatic flue gas dedusting process

The invention relates to a process for purifying flue gas, eliminating fly ash pollution and discharging the flue gas up to the standard, which belongs to the field of atmospheric environmental protection.

The existing flue gas ash removal process at home and abroad comprises the following steps:

the ash removal is mainly dry electrostatic ash removal, and the flow rate of flue gas is less than or equal to 1 m/s. The ash removal efficiency is 3, and the electric field is 98 percent. 99% in 4 electric field and 99.5% in 5 electric field. The blackness of the smoke is 1,

the water film is used for the second time, and the ash removal efficiency is 85-90%. The blackness of the smoke is 1,

at home and abroad, the flue gas is not humidified by adding water or mortar or limestone slurry into the flue gas. The smoke is changed into mist smoke. The ash-containing fog smoke enters a wet electrostatic device to separate out mortar. The purpose of ash removal is achieved. The ash removal efficiency is 99.99%. At the same time, the liquid is also separated out. And the blackness of the smoke is 0 grade.

The invention aims to provide a method for purifying flue gas to eliminate fly ash pollution. The process for discharging the flue gas after reaching the standard.

The wet electrostatic flue gas dedusting efficiency is improved from 85% of water film dedusting to more than 99.99%.

The blackness of the smoke is improved from 1 grade to 0 grade.

The electrostatic ash removal rate is improved from 98-99% to more than 99.99%.

The blackness of the smoke is improved from 1 grade to 0 grade.

The technology is not available at home and abroad. To achieve the above object. The process flow implementation scheme of the invention patent comprises the following steps: 1, a flue gas phase-change process; the flue gas is sprayed with water or slurry. The gas-solid two-phase flow smoke is changed into gas-liquid-solid three-phase flow smoke. 2, a sulfur fixation process, namely spraying the flue gas by using water or slurry to ensure that alkaline oxides and water-dissolved SO in ash2The reaction is carried out in the presence of a catalyst,

formation of CaH (H)2SO3)2。H2And (4) O aqueous solution. 3, the first gas-liquid two-phase flow flue gas sedimentation separation process, wherein the flow rate of the flue gas is less than or equal to 10 feet/second. Visible liquid beads, large ash particles, containing

The ash liquid drops settle and separate from the flue gas. 6 gas-liquid-solid three-phase flow flue gas wet electrostatic separation process. The mist smoke enters a wet electrostatic device to complete the separation of gas and liquid and solid. The separated liquid-solid-mortar is discharged into a slurry tank. The ashless transparent saturated flue gas is separated and discharged from the top through a fan. The effect is achieved; the ash removal efficiency is more than or equal to 99.9 percent, the desulfurization efficiency is more than or equal to 20 percent, the blackness of the flue gas is 0 grade, and the calcium/sulfur content is 0

Description attached figure 1 is a process flow diagram of the invention patent

FIG. 1 is a drawing of an abstract of an explanatory book

D-flue gas inlet direction. C- -flue gas direction.

A- -the flow direction of the electrostatic rinsing water,

b- -spray water or slurry flow direction.

E- -direction of the discharged mortar

0-ash removing tower inner slurry pool

1-ash removing tower internal phase-changing process

2-ash removing tower internal sulfur fixing process

3-ash removing tower internal settling process

4-wet electrostatic separator process

Case(s)

Medium: flue gas 6000m3Ash content 170Kg/h, SO content213500g/h, 160 ℃. A flue gas phase-change process;

the flue gas enters a phase converter, and the phase converter is internally added with mortar 16M3Spraying in mist form. The gas-liquid-solid three-phase flow-mist smoke can reduce the smoke temperature from 160 ℃ to 70-90 ℃. These 16M3And/h is discharged from a water seal port of the phase converter. The second mist smoke enters the ash removing tower. Spraying 16M mortar in the tower3Spraying in mist form to reduce the smoke temperature from 60-80 deg.C

Gas-liquid-solid three-phase flow-atomized flue gas. A second sulfur fixation process b;

the fog smoke flows in the ash removing tower at the flow speed of 1.8 m/s for 3 seconds, and the sprayed mortar reacts as follows

(SO in flue gas)2Dissolving in water, reacting with alkaline oxide and water in ash

Reaction) three first gas-liquid two-phase flow flue gas sedimentation separation processes d; liquid for treating urinary tract infection

The flow speed of the flue gas in the ash removing tower is 1.8 m/s, so that large particle ash and large particle ash-containing liquid beads and large particles are enabled

Granular CaH (H)2SO3)2·H2And O. And the liquid beads of the water are settled and separated from the flue gas to enter the mortar pool. A four-gas-liquid-solid three-phase flow flue gas enters a wet electrostatic separator separation process;

the mist smoke enters a wet electrostatic device, the flow speed is 1.8 m/s, and the residence time is 2.5 s. Slurry and quilt with polar plate capturing and adsorbing

The flushing water on the polar plate falls into the tower and sinks into the mortar pool. And discharging the electrostatic smoke through a fan. So far, the flue gas is 6000m3Ash content 170Kg/h, SO content213500g/h, 160 ℃ to 5000m3Ash content is less than or equal to 50mg/m3Containing SO2≤11000mg/m3Normal temperature saturated transparent CO2And (4) qi. And is discharged to the atmosphere. The ash removal efficiency is 99.99 percent, andthe desulfurization efficiency is more than 20 percent.

Claims (7)

  1. The wet electrostatic ash removing process for flue gas consists of;
    smoke phase-changing process, spraying water, mortar and limestone slurry to change gas phase into liquid phase, liquid phase and solid phase
    Phase flow-atomized smoke.
    Sulfur fixation process to ash, SO2The flue gas is sprayed with water, mortar and limestone slurry. Reaction to form
    CaH(H2SO3)2·H2O, aqueous solution. Creating the conditions of the sulfur fixation reaction:
    a gas-liquid two-phase flow flue gas sedimentation separation process, wherein the flow speed of the flue gas is less than 3 m/s. Make the gas-liquid-solid three-phase flow in the flue gas
    Large ash liquid bead, CaH (H)2SO3)2·H2O, aqueous solution and water
    Liquid beads and ash particles can not flow in a suspending way and settle to separate from smoke
    And (4) qi.
    Gas-liquid-solid three-phase flow flue gas wet electrostatic separation process, namely, enabling gas-liquid-solid three-phase flow flue gas to flow at a flow speed of less than 3 m/s
    Entering a wet electrostatic separator for separation. The overflowing time is more than 2 seconds.
    The slurry absorbed by the polar plate is washed by the washing water on the polar plate
    And (3) cleaning. Slurry flowing-down tank
    The ash-free colorless transparent saturated smoke is separated out and passes through a fan
    And (4) discharging.
    The ash removal efficiency is 99.9 percent, and the liquid is removed to be saturated and transparent
  2. 2 the wet electrostatic ash removal process for flue gas as claimed in claim 1, wherein: (ii) a
    The phase-change process for fume is to spray fume with water, mortar and limestone slurry
    The gas-solid two-phase flow is changed into gas-liquid-solid three-phase flow, namely atomized smoke.
  3. 3 the wet electrostatic ash removal process for flue gas as claimed in claim 1, wherein: (ii) a
    The gas-liquid-solid three-phase flow flue gas settling separation process is characterized by that the flue gas flow rate is less than 3 m/s
  4. 4 according to the wet electrostatic ash removal process of the flue gas claim 1, the method is characterized in that:
    the sulfur-fixing process is to spray water, mortar and limestone slurry to the fume in gas-solid two-phase flow
  5. 5 according to the wet electrostatic ash removal process of the flue gas claim 1, the method is characterized in that:
    the wet electrostatic separation process of the gas-liquid-solid three-phase flow mist smoke is that the gas-liquid-solid three-phase flow mist smoke enters the wet electrostatic separation process
    And (4) an electric field, wherein the flow speed of the flue gas in the electrostatic field is less than 3 m/s. The residence time was>2 seconds. Slurry adsorbed by polar plate, by polar plate
    The flushing water on the pulp tank falls to the pulp tank.
  6. 6 the wet electrostatic ash removal process for the flue gas as claimed in claim 1;
    corrosion prevention for flow passage component
  7. The wet electrostatic ash removal process for the flue gas as claimed in claim 1 is characterized in that; the wet-type electrostatic device is vertical. The adsorption plates must be rinsed.
CN 02109095 2002-01-28 2002-01-28 Wet electrostatic flue gas dedusting process CN1435278A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 02109095 CN1435278A (en) 2002-01-28 2002-01-28 Wet electrostatic flue gas dedusting process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 02109095 CN1435278A (en) 2002-01-28 2002-01-28 Wet electrostatic flue gas dedusting process

Publications (1)

Publication Number Publication Date
CN1435278A true CN1435278A (en) 2003-08-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 02109095 CN1435278A (en) 2002-01-28 2002-01-28 Wet electrostatic flue gas dedusting process

Country Status (1)

Country Link
CN (1) CN1435278A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102580511A (en) * 2011-04-21 2012-07-18 庄建中 Liquid oxidation and solid concentration tower
CN102580450A (en) * 2011-04-20 2012-07-18 庄建中 Process for enlarging inhalable particles through wet method
CN102580431A (en) * 2011-04-20 2012-07-18 庄建中 Dedusting and dusulfuration integration process for smoke
CN102728169A (en) * 2012-02-23 2012-10-17 庄建中 Multiphase flow flue gas purification technology

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102580450A (en) * 2011-04-20 2012-07-18 庄建中 Process for enlarging inhalable particles through wet method
CN102580431A (en) * 2011-04-20 2012-07-18 庄建中 Dedusting and dusulfuration integration process for smoke
CN102580431B (en) * 2011-04-20 2015-07-22 庄建中 Dedusting and dusulfuration integration process for smoke
CN102580511A (en) * 2011-04-21 2012-07-18 庄建中 Liquid oxidation and solid concentration tower
CN102580511B (en) * 2011-04-21 2014-07-23 庄建中 Liquid oxidation and solid concentration tower
CN102728169A (en) * 2012-02-23 2012-10-17 庄建中 Multiphase flow flue gas purification technology

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