CN110614090A

CN110614090A - Process for activating, deactivating and removing organic matter active carbon by using gas boiler flue gas

Info

Publication number: CN110614090A
Application number: CN201910916543.0A
Authority: CN
Inventors: 杨皓; 张秋林; 宁平; 田森林; 刘建英
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2019-12-27

Abstract

The invention discloses a process for activating ineffective organic matter-removing active carbon by using gas boiler flue gas, wherein the flow rate of the gas boiler flue gas is more than 4 times of that of the activated flue gas, the ineffective active carbon is filled into an activation tower or is kept in an original adsorption tower (both types of equipment need to be designed at the temperature of more than 600 ℃), 130 ~ ℃ 130-150 ℃ boiler flue gas (containing combustion water) containing 3- ~% oxygen is firstly used for heating the ineffective active carbon, the temperature is kept for 0.5 ~ hours after the heating is finished, the activated gas is refluxed and led into a boiler for combustion, which is called as a primary activation process, then 350- ~ ℃ 10- ~% oxygen-containing boiler flue gas (added with air) is used for heating the ineffective active carbon, the activated gas is refluxed and led into the boiler for combustion, the temperature is kept for more than 0.5 hours, which is called as a final activation process, the activation is finished, the activated carbon is cooled and the activated carbon is cooled by using 130- ~ ℃ boiler flue gas (containing combustion water) to be cooled and the cooled and led into the boiler for combustion, and finally, the activated carbon is cooled by using normal-temperature.

Description

Process for activating, deactivating and removing organic matter active carbon by using gas boiler flue gas

Technical Field

The invention relates to the fields of chemical industry, energy conservation and environmental protection, and discloses a method for effectively reducing the emission of solid wastes and reducing the resource consumption.

Background

The fuel of the existing gas-fired boiler is subjected to deep desulfurization, the flue gas of the boiler contains 3 ~ 10% of oxygen, 10 ~ 15% of carbon dioxide and 20 ~ 30% of water vapor, and the treated flue gas is discharged to meet the national standard.

Benzene and heavy hydrocarbon in the synthetic organic matter production process need to be separated or purified from products or process products, and the common method is to adopt an activated carbon adsorbent for adsorption purification.

In the process of preparing natural gas and synthesis gas from coal, benzene and heavy hydrocarbon in mixed gas need to be separated and purified from the mixed gas before pressure rise or reaction, and the common method is to use an activated carbon adsorbent to adsorb and purify the benzene and heavy hydrocarbon.

CN110129077A of Li Jiu et al, environmental protection engineering Limited, Guangzhou, announced a pyrolysis process, including drying pretreatment; carrying out waste pyrolysis on the organic hazardous waste to obtain a first pyrolysis product; providing a first separation device to separate the first pyrolysis product to obtain pyrolysis gas and residue; the pyrolysis gas is combusted to generate high-temperature flue gas, and the high-temperature flue gas enters the first pyrolysis device to provide a heat source for the first pyrolysis device; pyrolyzing the waste active carbon to generate a second pyrolysis product; providing a second separation device to separate the second pyrolysis product to obtain desorption gas and regenerated activated carbon, wherein the desorption gas enters the combustion chamber; the high-temperature flue gas entering the first pyrolysis device provides a heat source for the second pyrolysis device, then enters the waste heat boiler, and heats water in the waste heat boiler to generate saturated vapor to provide a heat source for the drying device. The pyrolysis gas generated by the pyrolysis process is combusted to generate high-temperature flue gas, heat sources are sequentially provided for organic hazardous waste pyrolysis, waste activated carbon regeneration and a waste heat boiler, and saturated steam generated by the waste heat boiler provides a heat source for a drying system, so that the resource is recycled.

CN108571861A Proteck carbon of salt city Proteck carbon Co., Ltd announced a drying process for waste activated carbon regeneration, which comprises hot air drying, cyclone collection and pulse collection, the drying process for waste activated carbon regeneration of the invention generates high-temperature hot air by a burner, stabilizes the temperature of the high-temperature hot air at about 300 ℃ after the high-temperature hot air is stabilized by a heat exchanger, and then dries wet powdered carbon by a recovery pipeline, because the dried waste activated carbon can be easily blown away by the high-temperature hot air, in order to avoid the waste activated carbon loss in the hot air drying step, two steps of cyclone collection and pulse collection are designed after the hot air drying step, in the hot air drying step, the high-temperature hot air containing the waste activated carbon dried first is subjected to secondary recovery and tertiary recovery, the waste activated carbon taken away by the high-temperature waste gas is collected to the maximum extent, and waste is avoided, meanwhile, the secondary pollution of the waste activated carbon brought out from the waste gas generated by the drying process to the environment is avoided.

The harmless property of the flue gas of the existing gas-fired boiler is utilized to jointly treat the waste activated carbon adsorbing hydrocarbon organic matters (without sulfur, phosphorus, arsenic, heavy metals and the like), so that a large amount of investment can be saved, and the existing gas-fired boiler can burn regenerated organic gas.

Disclosure of Invention

Under the condition that the total flow of the flue gas of the gas-fired boiler is more than 4 times of the flow of the activated flue gas, the combustion and post-treatment process of the original boiler cannot be influenced when the flue gas of the boiler is used for activating the activated carbon. If the flue gas flow of the boiler is too small, or the operation of the original boiler is influenced.

The method comprises the steps of loading the inactivated and organic matter-removing active carbon into an activation tower or keeping the activated carbon in an original adsorption tower (the tolerance temperature of the two types of equipment is higher than 600 ℃ when the working pressure is normal pressure), heating the inactivated active carbon by using boiler flue gas (containing combustion water) with the oxygen content of 3 ~ 10% and the temperature of 130 ~ 150 ℃, keeping the temperature for 0.5 ~ 4 hours after the heating is finished, introducing the activated gas into a gas boiler for combustion in a backflow mode, wherein the preliminary activation process is called, and the activation airspeed is 40 ~ 500Hr^-1Heating the deactivated activated carbon with boiler flue gas (added with air) containing 10 ~ 15% of oxygen at 350 ~ 540 ℃ and 540 ℃, partially oxidizing organic gas, introducing the activated gas into the boiler for combustion in a refluxing manner, keeping the temperature for more than 0.5 h, and obtaining a final activation process, wherein the activation space velocity is 40 ~ 500Hr^-1The activation is finished, the temperature of the inactivated active carbon is raised by the boiler smoke (containing combustion water) at the temperature of 130 ~ 150 ℃, the activated carbon is cooled and cooled, the cooling gas flows back and is led into the boiler for combustion, finally, the normal-temperature dry air is used for cooling and cooling, the cooling gas flows back and is led into the boiler for combustion, and the adsorption quantity of the activated active carbon is basically the same as that of the new active carbon.

All the regenerated active carbon gas and the cooling gas enter the gas-fired boiler, so that a flue gas treatment system of the gas-fired boiler and the activated active carbon activated tail gas are treated together, the investment is reduced, and meanwhile, the regenerated gas containing organic matters enters the combustion furnace to provide a part of fuel, so that the gas consumption is reduced.

The high-flow high-temperature combustion system provided by the gas boiler can realize full combustion of the regenerated organic gas, has larger gas flow than a combustion system independently set for combusting the organic gas, has high combustion efficiency, and avoids secondary pollution of subsequent organic waste gas.

Detailed Description

Example 1: 1 steam ton gas boiler flue gas flow 1088Nm³Per H, activated flue gas flow 220Nm³Respectively placing 4 parts of inactivated and organic matter-removing active carbon into two activation towers (2 parts of each active carbon, and the normal pressure tolerance temperature is higher than 600 ℃), firstly using boiler flue gas (containing combustion water) with the oxygen content of 5% and the temperature of 130 ~ 140 ℃ to heat the inactivated active carbon, finishing heating, keeping the temperature for 0.5 hour, completely refluxing the activated gas and introducing the activated gas into a gas boiler for combustion, and referring to a primary activation process, wherein the activation airspeed is 150Hr^-1Heating the deactivated activated carbon by using boiler flue gas (adding part of air) with the oxygen content of 12% at the temperature of 500 ~ 540 ℃, introducing all the activated gas into the gas-fired boiler for combustion after the activated gas reflows, finishing the heating, keeping the temperature for 2 hours, and obtaining a final activation process, wherein the activation space velocity is 150Hr^-1Cooling activated carbon to 150 ℃ by using boiler flue gas (containing combustion water) at the temperature of 130 ~ 150 ℃, introducing all cooling gas into a gas boiler for combustion in a refluxing manner, finally cooling to normal temperature by using normal-temperature dry air, introducing all cooling gas into the gas boiler for combustion in a refluxing manner, wherein the adsorption quantity of the activated carbon is basically the same as that of the new activated carbon.

Example 2: 5 steam ton gas boiler flue gas flow 5400Nm³H, activated flue gas flow 1000Nm³Respectively loading 14 parts of inactivated and organic matter-removing active carbon into two activation towers (each 7 parts is higher than 600 ℃ under normal pressure), firstly heating the inactivated active carbon by using boiler flue gas (containing combustion water) with the temperature of 130 ~ 140 ℃ and the temperature of 6 percent of oxygen, keeping the temperature for 0.7 hour, completely refluxing the activated gas and introducing the activated gas into a gas boiler for combustion, and referring to a primary activation process, wherein the activation space velocity is 250Hr^-1Using the boiler flue gas (with part of air) containing 11% oxygen at 500 ~ 540 deg.C and 540 deg.C) Heating the deactivated active carbon, introducing the activated gas into a gas boiler for combustion, maintaining the temperature for 1.5 hours after the heating is finished, and obtaining the final activation process, wherein the activation airspeed is 250Hr^-1Cooling activated carbon to 150 ℃ by using boiler flue gas (containing combustion water) at the temperature of 130 ~ 150 ℃, introducing all cooling gas into a gas boiler for combustion in a refluxing manner, finally cooling to normal temperature by using normal-temperature dry air, introducing all cooling gas into the gas boiler for combustion in a refluxing manner, wherein the adsorption quantity of the activated carbon is basically the same as that of the new activated carbon.

Example 3: 50 steam ton gas boiler flue gas flow rate 54000Nm³PerH, activated flue gas flow 10000Nm³Respectively loading 70 parts of inactivated activated carbon into two activation towers (each 35 parts, and the normal pressure tolerance temperature is higher than 600 ℃), firstly heating the inactivated activated carbon by using boiler flue gas (containing combustion water) with the temperature of 130 ~ 140 ℃ and the temperature of 6 percent of oxygen, keeping the temperature for 0.2 hour, completely refluxing the activated gas, introducing the activated gas into a gas boiler for combustion, and referring to a primary activation process, wherein the activation space velocity is 500Hr^-1Heating the deactivated activated carbon by using boiler flue gas (adding part of air) with the oxygen content of 12% at the temperature of 500 ~ 540 ℃, introducing all the activated gas into the gas-fired boiler for combustion after the activated gas reflows, finishing the heating, keeping the temperature for 5 hours, and obtaining a final activation process, wherein the activation space velocity is 500Hr^-1Cooling activated carbon to 150 ℃ by using boiler flue gas (containing combustion water) at the temperature of 130 ~ 150 ℃, introducing all cooling gas into a gas boiler for combustion in a refluxing manner, finally cooling to normal temperature by using normal-temperature dry air, introducing all cooling gas into the gas boiler for combustion in a refluxing manner, wherein the adsorption quantity of the activated carbon is basically the same as that of the new activated carbon.

Claims

1. A process for activating ineffective organic matter-removing activated carbon by using gas boiler flue gas is characterized in that the flow of the flue gas of the gas boiler is more than 4 times of the flow of the activated flue gas, the inactivated activated carbon is filled into an activation tower or kept in an original adsorption tower (the design temperature of two types of equipment is higher than 600 ℃), the inactivated activated carbon is heated by using the boiler flue gas (containing combustion water) which contains 3 ~ 10% of oxygen and is at 130 ~ 150 ℃ firstly, the heating is finished, and the temperature is raisedKeeping for 0.5 ~ 4 Hr, introducing the activated gas into the boiler for combustion, and performing primary activation at a space velocity of 40 ~ 500Hr^-1Heating the deactivated activated carbon with boiler flue gas (added with air) containing 10 ~ 15% of oxygen at 350 ~ 540 ℃ and 540 ℃, introducing the activated gas into the boiler for combustion in a refluxing manner, keeping the temperature for more than 0.5 h, and obtaining a final activation process with an activation space velocity of 40 ~ 500Hr^-1Cooling activated carbon by using boiler flue gas (containing combustion water) at the temperature of 130 ~ 150 ℃, introducing the cooling gas into a boiler for combustion in a refluxing manner, finally cooling by using normal-temperature dry air, introducing the cooling gas into the boiler for combustion in a refluxing manner, wherein the adsorption quantity of the activated carbon is basically the same as that of the new activated carbon.