WO2008046298A1

WO2008046298A1 - A waste gas recovering method in regenerative process of the filtering-absorption material

Info

Publication number: WO2008046298A1
Application number: PCT/CN2007/002900
Authority: WO
Inventors: Dawei Zhang
Original assignee: Dawei Zhang
Priority date: 2006-10-11
Filing date: 2007-10-09
Publication date: 2008-04-24
Also published as: CN101161334A

Abstract

A waste gas recovering method in regenerative process of the filtering-absorption material comprises the following steps: A) the waste gas is dedusted; B) the gas treated after step A) is subjected to gas-liquid separation; C) the gas treated after B) is as the fuel of a regenerative furnace of the filtering-absorption material and as the fuel of a boiler; D) the tar in water generated from steps A, B is subjected to oil-water separation, the clean water is reused, the tar is recovered and the tar residue is as the fuel of the boiler. The filtering-absorption material are made of anthracite, lean coal, weak coal, coke coal, fat coal, gas coal, long-flame coal, lignite, coke, coke powder as raw material.

Description

Method for recovering exhaust gas in filtration regeneration process of adsorbent

Technical field

The invention relates to a method for recovering exhaust gas in a process of filtering adsorbent regeneration, in particular to a method for recovering exhaust gas generated in a process of regenerating a filter adsorbent for treating industrial wastewater and urban sewage. Background technique

At present, most urban sewage and industrial wastewater (especially industrial wastewater with large discharge) are treated by biochemical, anaerobic, aerobic, activated sludge, chemical addition, etc. The above method covers a large area and consumes electricity. A large amount of sludge is produced during the treatment, and it is difficult to treat wastewater that is difficult to biochemical such as high salt, high acid, and high COD. There are various solid adsorbents currently used for water treatment, such as activated carbon, charcoal, bentonite, diatomaceous earth, calcium carbonate, slag, coke breeze, slag, and the like. After being used for a period of time, the adsorbed adsorbent adsorbs inorganic substances and organic substances in the waste water and sewage. These pollutants make the filtered adsorbent hydrophobic, occupy the active crystal lattice of the filtered adsorbent, and the organic matter accumulates continuously to adsorb the adsorption capacity of the adsorbent. The gradual reduction affects the performance of the filtered adsorbent. The regeneration of the filtered adsorbent can be restored by the regeneration method, and can be reused, reducing the cost of water treatment. During the regeneration of the filtered adsorbent, the organic matter in the pores of the filtered adsorbent volatilizes and decomposes at a high temperature to form a mixed gas containing components such as formamidine, ethane, ethylene, tar vapor, carbon dioxide, carbon monoxide, etc., and the mixed gas Recycling as a boiler fuel can avoid air pollution caused by harmful gas emissions and save energy. Summary of the invention

The object of the present invention is to provide an exhaust gas recovery and utilization method in the process of regenerating a filtered adsorbent for treating industrial wastewater and urban sewage.

In order to achieve the above object, the recycling and utilization method provided by the present invention has the following steps:

A) dedusting the exhaust gas;

B) Step A The gas after the treatment is subjected to gas-liquid separation treatment;

C) Step B treated gas as fuel;

D) Steps A and B produce tar water for oil-water separation treatment;

The exhaust gas recovery method, wherein the dust removal treatment in the step A uses a cyclone and an exhaust gas scrubber. The exhaust gas recovery method, wherein the dust removal treatment in step A first uses a cyclone dust collector or exhaust gas washing 2007/002900 Tower processing.

In the exhaust gas recovery method, the gas in the step B is subjected to gas-water separation using a gas-liquid separator and an electric tar collector for oil and gas separation.

In the method for recovering exhaust gas, wherein the tar water produced in steps A and B is separated and treated in step D, the generated clean water is reused, the generated tar is recovered, and the generated tar residue is used as boiler fuel;

The exhaust gas recovery method, wherein the filtered adsorbent refers to anthracite, lean coal, lean coal, coking coal, fat coal, gas coal, long flame coal, lignite as raw materials, and coal processing products such as coke and basket charcoal. , the end of the coke is prepared from raw materials for industrial wastewater, urban sewage materials.

The exhaust gas recovery method, wherein the exhaust gas is a thermal regeneration process of the filtered adsorbent after treating the wastewater sewage in the regeneration furnace, and the organic matter in the filtered adsorbent is volatilized and decomposed by heat, and is produced by the formamidine, ethane, A mixture of ethylene, tar vapor, carbon dioxide, carbon monoxide and other components.

The invention consists of the following parts: a regenerative furnace, a cyclone, an exhaust gas scrubber, a gas-liquid separator, an electric tar catcher, a high-voltage electrostatic generator, a gas discharge machine, a gas buffer tank, a gas press, a boiler, and a safety Discharge valve, oil water separator, slurry pump, tar storage tank, circulating water pump, slag discharge equipment, sedimentation tank.

The filtered adsorbent after treating wastewater and sewage contains a large amount of organic matter. When the filtered adsorbent is subjected to thermal regeneration in the regeneration furnace, the organic matter in the filtered adsorbent is heated and then volatilized and decomposed to produce methane, acetamidine, ethylene, A mixed gas consisting of tar vapor, carbon dioxide, carbon monoxide, etc., with a calorific value of 1,100-2,500 kcal/m. When the regenerator is operated, the organic matter in the internal adsorbed material is heated and volatilized, and the mixture produced by the decomposition can be recycled. Coal tar and non-recovery coal tar are used in two ways.

The method for utilizing the mixed gas for recovering coal tar is: conveying the mixed gas generated in the regenerative furnace to the exhaust gas scrubbing tower, and the gas treated by the exhaust gas scrubbing tower is sent to the gas-liquid separator for further processing, after being treated by the gas-liquid separator The gas is sent to the electric tar catcher, and the electric tar catcher is equipped with a high-voltage electrostatic generator. The gas processed by the electric tar catcher is sent to the gas buffer tank by the gas discharge machine, and the gas in the gas buffer tank is pressurized by the gas. The machine delivers a portion of the regenerative furnace that filters the adsorbent to the fuel required for heating, and the remainder is delivered to the boiler room of the enterprise as an auxiliary fuel for the boiler. The tar water discharged from the exhaust gas scrubbing tower, the gas-liquid separator and the gas buffer tank enters the oil-water separator, and the banana oil separated by the oil-water separator is transported to the tar storage tank by the slurry pump; the water separated by the oil-water separator Inflow into the settling tank, the clear water in the settling tank is transported by the circulating water pump to the exhaust gas washing tower for recycling. The tar residue at the bottom of the sedimentation tank is discharged from the slag discharging equipment and sent to the boiler room of the enterprise, and mixed with the fuel coal to be used as fuel for the boiler to remove the slag. The equipment can be used with a scraper slag remover, a screw conveyor, etc., all of which are well known products. The exhaust gas scrubber is equipped with a safety relief valve. .. The method for utilizing the mixed gas that does not recover the coal tar is: conveying the mixed gas generated in the regenerative furnace to the cyclone, and the mixture after being treated by the cyclone is transported by the gas press to a filter adsorption through the gas pipeline The regenerative furnace of the feed is used as fuel for heating, and the rest is transported to the boiler room of the enterprise through the gas pipeline as auxiliary fuel for the boiler. The length of the transfer pipe should be less than 100 meters and it needs to be insulated.

The filtered adsorbent for regeneration according to the present invention refers to anthracite, lean coal, lean coal, coking coal, fat coal, gas coal, long flame coal, lignite as raw materials, and coal processing products such as coke, basket charcoal, and coke. The filter adsorbent prepared for the raw materials is pulverized and screened, and the raw material having a particle size of <10 mm is placed at a starting temperature of 120-150 ° C, and the temperature is raised at a rate of 4 ° C / minute, and the raw material is dried; The temperature is raised to 510-650 ° C at a rate of -8 Ό / min, and the temperature is 40-70 minutes, the raw materials are carbonized and carbonized; and then heated to 800 ° C at a rate of 4-6 ° C / minute, first activated with water vapor, and then Activated with flue gas, the activation time is 20-60 minutes, and the activation temperature is 840-95 (TC.

The main data and parameters of the filter adsorbent:

Methylene blue: 30~85mg/g

Ash: 8~15%

Filling density: 200~550g/l

Iodine value: 260~720mg/g

Specific surface area: 200~490m ² /g

Activation reaction temperature: 80 (TC ~ 950 ° C

Activation time: 20min~60min

Filter adsorbent yield: 400kg~600kg/t. coal

Chemical oxygen demand (COD) Adsorption capacity: 200~3,000mg/g.

The regeneration of the filtered adsorbent according to the present invention is performed by discharging the saturated filtered adsorbent in the water treatment device and then dehydrating, so that the water content of the saturated filtered adsorbent is <30%. The dehydrated saturated filtered adsorbent is sent to a regenerative furnace, heated at a rate of 4 Torr/min, raised to 120-200 ° C, and the saturated filtered adsorbent is dried, and the moisture in the adsorbed pores is filtered during the drying process. A portion of the low boiling organic matter is volatilized. After the saturated filter adsorbent is dried, the temperature is raised to 450-650 以 at a rate of 6-8 ° C / minute to dry-distill and carbonize the raw materials, and the high-boiling organic matter contained in the material is decomposed, and a part of the material becomes a low-boiling substance and then volatilizes. Another part of the carbonization; further heating to 700 ° C at a rate of 4-6 Ό / min, first activated with water vapor, and then activated with flue gas, activation time is 20-60 minutes. DRAWINGS

Figure 1 Flow chart of waste gas recovery process during filtration of adsorbent regeneration (recovery of coal tar)

Figure 2 Flow chart of waste gas recovery process during filtration of adsorbent regeneration (no recovery of coal tar)

In the picture: 1 regeneration furnace, 2 cyclone dust collector, 3 exhaust gas scrubber, 4 gas-liquid separator, 5 electric tar catcher, 6 high-voltage electrostatic generator, 7 gas discharge machine, 8 gas buffer tank, 9 gas pressure Machine, 10 boilers, 11 safety relief valves, 12 oil water separators, 13 oil slurry pumps, 14 tar storage tanks, 15 circulating water pumps, 16 slag discharging equipment, 17 sedimentation tanks. detailed description

as the picture shows:

When the filtered adsorbent is subjected to thermal regeneration in the regeneration furnace (1), the organic matter in the filtered adsorbent is heated and volatilized and decomposed to produce a mixed gas composed of components such as methane, ethane, ethylene, tar vapor, carbon dioxide, carbon monoxide and the like. The calorific value is 1,100-2,500kcal/m ³ . When the regenerative furnace (1) is in operation, the mixed gas generated by the internal filtration of the organic matter in the adsorbent after being heated and volatilized and decomposed may be utilized by two methods of recovering coal tar and not recovering coal tar.

The method for utilizing the mixed gas for recovering coal tar is;

When the regenerative furnace (1) is in operation, the mixture of the internal adsorbed material in the adsorbent is heated and volatilized and decomposed, and the mixture is sent to the exhaust scrubber (3) after being treated by the cyclone (2), and passed through the exhaust scrubber (3). The treated gas is sent to the gas-liquid separator (4) for further processing, and the gas treated by the gas-liquid separator (4) is sent to the electric tar catcher (5), and the electric tar catcher is equipped with a high-voltage electrostatic generator ( 6), the gas treated by the electric tar catcher (5) is sent to the gas buffer tank (8) by the gas discharge machine (7), and the gas in the gas buffer tank (8) is passed through the gas press machine (9) A part of which is sent to the regeneration furnace (1) for filtering the adsorbent is used as fuel for heating, and the remainder is sent to the boiler room of the company as an auxiliary fuel for the boiler (10). The tar water discharged from the exhaust gas scrubber (2), the gas-liquid separator (4), and the gas buffer tank (8) enters the oil-water separator (12), and the oil-water separator

(12) The separated tar is sent to the tar tank (14) via the slurry pump (13); the water separated by the oil-water separator (12) flows into the settling tank (17), and the settling tank (17) is circulated by the clear water. The pump (15) is sent back to the exhaust scrubber

(3), Settling tank (17) The tar residue at the bottom is discharged from the slag discharging equipment (16) and sent to the boiler room of the enterprise, and mixed with fuel coal to be used as fuel for the boiler (10). The exhaust gas scrubber (3) is fitted with a safety relief valve (11).

The method for utilizing the mixed gas that does not recover coal tar is;

When the regenerative furnace (1) is in operation, the mixture of the internal adsorbed material in the adsorbent is heated and volatilized and decomposed to produce a mixture. 0 After the gas is treated by the cyclone (2), part of it is transported by the gas press (9) through the gas pipeline to the regeneration furnace (1) for filtering the adsorbent as the fuel for heating, and the rest is passed through the gas. The pipeline is delivered to the boiler room of the company as an auxiliary fuel for the boiler (10). The length of the transfer pipe should be less than 100 meters and it needs to be insulated.

Claims

Rights request

1. A method for recovering exhaust gas in a process of filtering adsorbent regeneration, the steps of which are as follows:

A) dedusting the exhaust gas;

B) Step A: The treated gas is subjected to gas-liquid separation treatment;

C) Step B treated gas as fuel and boiler fuel for filtering the adsorbent regeneration furnace;

D) Steps A and B produce tar water for oil-water separation treatment;

2. The exhaust gas recovery method, wherein the dust removal treatment in step A uses a cyclone dust collector and an exhaust gas scrubber.

3. The exhaust gas recovery method, wherein the dust removal treatment in the step A is first treated by a cyclone dust collector, and then the water is drained and dusted.

4. The method for recovering exhaust gas, wherein the gas of step B is gas-liquid separated by a gas-liquid separator and the electric tar catcher is used for oil and gas separation.

5. The exhaust gas recovery method, wherein the tar water produced in steps A and B is separated and treated in step D, the generated fresh water is reused, the generated tar is recovered, and the generated tar residue is used as boiler fuel;

6. The exhaust gas recovery method, wherein the filtered adsorbent material refers to anthracite, lean coal, lean coal, coking coal, fat coal, gas coal, long flame coal, lignite as raw materials, and coal processing products such as coke, The materials used for industrial wastewater and urban sewage are prepared from basket charcoal and coke.

7. The exhaust gas recovery method, wherein the exhaust gas is a thermal regeneration process of the filtered adsorbent after treating the wastewater sewage in the regeneration furnace, and the organic matter in the filtered adsorbent is volatilized and decomposed by heat, and is produced by the beetle and the B. A mixed gas consisting of alkane, ethylene, tar vapor, carbon dioxide, carbon monoxide, and the like.