Coal-fired boiler tail gas membrane filtration enriched oxygen recycling method and device
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A coal-fired boiler and membrane filtration technology, which is applied in the direction of combustion methods, separation methods, chemical instruments and methods, etc., can solve the problems of low degree of automation, inconvenient use, waste, etc.
Active Publication Date: 2012-06-27
GUANGDONG DAZHONG AGRI SCI CO LTD
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However, for on-site air supply in specific environments such as medium and small-sized air separation and mobile equipment, this product has little requirements, and has low flexibility, large investment, high energy consumption, low degree of automation, complicated operation, and is not easy to use. convenient
[0005] In addition, the heat energy carried by the tail gas of coal-fired boilers in the prior art is all discharged to the atmosphere, and there is no recycling
A large amount of low-temperature heat energy in the exhaust gas is discharged in vain, causing waste and pollution, and increasing the consumption of coal and other fuels
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Embodiment 1
[0057] Such as figure 1 and figure 2 As shown, the coal-fired boiler tail gas membrane filtration oxygen-enriched recycling method of the present invention comprises the following steps:
[0058] Step A, mix the coal used for boiler 1 combustion with desulfurizer to make desulfurized coal, put the desulfurized coal into the inlet of boiler 1 for combustion; boiler 1 burns the desulfurized coal, which greatly reduces the content of sulfur dioxide gas in the tail gas of boiler 1, and the environment less pollution.
[0059] The desulfurizer of the present embodiment is made by mixing raw materials in the following weight percentages:
[0060] Slaked lime Ca(OH) 2 75%
[0061] Cinder or silica ore produced after coal combustion 15%
[0062] Sodium carbonate Na 2 CO 3 5%
[0063] Amino Acids 5%.
[0064] Step B. Concentrating the tail gas discharged from the coal-fired boiler 1 for waste heat recovery treatment to cool down th...
Embodiment 2
[0074] Such as figure 1 and figure 2 As shown, the coal-fired boiler tail gas membrane filtration oxygen-enriched recycling method of the present invention comprises the following steps:
[0075] Step A, mix the coal used for boiler 1 combustion with desulfurizer to make desulfurized coal, put the desulfurized coal into the inlet of boiler 1 for combustion; boiler 1 burns the desulfurized coal, which greatly reduces the content of sulfur dioxide gas in the tail gas of boiler 1, and the environment less pollution.
[0076] The desulfurizer of the present embodiment is made by mixing raw materials in the following weight percentages:
[0077] Slaked lime Ca(OH) 2 80%
[0078] Cinder or silica ore produced after coal combustion 10%
[0079] Sodium carbonate Na 2 CO 3 5%
[0080] Amino Acids 5%.
[0081] Step B. Concentrating the tail gas discharged from the coal-fired boiler 1 for waste heat recovery treatment to cool down th...
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Abstract
The invention relates to the technical field of tail gas recovery, in particular to a coal-fired boiler tail gas membrane filtration enriched oxygen recycling method and a coal-fired boiler tail gas membrane filtration enriched oxygen recycling device. The recycling method comprises the following steps: mixing coal and a desulfurizer to obtain desulfurized coal, feeding the desulfurized coal into a boiler and burning the desulfurized coal; recovering afterheat from the tail gas; layering the tail gas in a pressure regulating device; recovering the layered gas by a recovering device; absorbing the mixed tail gas by an absorbing device; and circulating the tail gas to the boiler to be burnt again, and introducing the afterheat and oxygen passing through the membrane filtering device into the coal-fired boiler for burning. The recycling device comprises a tail gas afterheat recovering device, a pressure regulating device and an absorbing device, which are connected in turn, wherein the pressure regulating device is connected with the recovering device; and the air outlet of the tail gas afterheat recovering device is provided with the membrane filtering device. The method and the device have the advantages of circularly burning all tail gas, preventing pollution by waste gas, avoiding producing particulate matter 2.5 (PM2.5), reducing environment pollution, along with low cost, simple process, high fuel burning efficiency and small fuel consumption.
Description
technical field [0001] The invention relates to the technical field of tail gas recovery, in particular to a method and device for recycling oxygen-enriched membrane filtration of coal-fired boiler tail gas. Background technique [0002] With the development of society, the continuous improvement of people's living standards, the continuous increase of city scale, the energy consumption is also increasing. In order to sustain development, the country is paying more and more attention to energy conservation and emission reduction. [0003] Because coal contains sulfur, a large amount of sulfur dioxide (SO 2 ) and other harmful gases, along with the discharge of exhaust gas from coal-fired boilers, have brought serious pollution to the surrounding environment and the atmosphere. The well-known coal-fired boiler tail gas treatment adopts dry or wet desulfurization and denitrification technology. The dry desulfurization rate is about 85%, and the wet desulfurization rate is ab...
Claims
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