CN216155799U - Blast furnace gas desulfurization ultra-clean system - Google Patents
Blast furnace gas desulfurization ultra-clean system Download PDFInfo
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- CN216155799U CN216155799U CN202120083149.6U CN202120083149U CN216155799U CN 216155799 U CN216155799 U CN 216155799U CN 202120083149 U CN202120083149 U CN 202120083149U CN 216155799 U CN216155799 U CN 216155799U
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Abstract
The utility model relates toThe utility model provides a blast furnace gas desulfurization ultra-clean system, ultra-clean system is including the flue gas adsorption system, harmful gas release system, gas combustion system and the pneumatic clean system of wet process that connect gradually the setting, flue gas adsorption system's entry is connected with blast furnace gas and is set up, flue gas adsorption system still is connected with blast furnace gas user end and sets up, includes the adsorbent in this flue gas adsorption system, harmful gas release system can carry out desorption operation to the adsorbent after directional absorption, gas combustion system can produce heat energy, and the heat energy that produces can heat gas release system, the pneumatic clean system of wet process can carry out wet process to the flue gas after gas combustion system burns and purify, detach SO in the flue gas2And obtaining the purified flue gas. The ultra-clean system can be used in the field of blast furnace gas ultra-clean.
Description
Technical Field
The utility model belongs to the technical field of environmental protection, and relates to a process route and a method for ultra-clean carbon roasting flue gas, in particular to a blast furnace gas desulfurization ultra-clean system.
Background
The blast furnace gas contains combustible gases such as carbon monoxide, hydrogen, methane and the like, wherein the volume content of the carbon monoxide is about 28%, the volume content of the hydrogen is about 1%, and the volume content of the methane is about 0.5%. In addition, blast furnace gas also contains about 1% oxygen. In the actual production and application process, the blast furnace gas generally utilizes a residual pressure turbine power generation unit (TRT) to recover the pressure energy and heat energy of the blast furnace gas, and the obtained low-temperature and low-pressure blast furnace gas is generally sent to a hot blast stove, a heating furnace, a coke oven, a boiler and a gas turbine unit in a fuel mode for combustion and use. However, in addition to the above-mentioned gases, the blast furnace gas contains COS (carbonyl sulfide) and CS2、H2S, and the like, wherein the main components are COS, H2S, the total sulfur concentration generally reaches 200mgS/Nm3The above. The sulfides not only corrode the pipeline of the equipment, but also form SO under the action of sunlight and flue gas if the sulfides are discharged into the air without limitation2、SO3And in turn, causes a significant amount of acid rain to form. With the increasing awareness of environmental protection, the emission limit of sulfur is becoming more and more strict, and each terminal using blast furnace gas builds up a huge flue gas desulfurization device. The dispersed desulfurization device not only greatly wastes the limited steel mill space, but also increasingly highlights the cost and secondary pollution of flue gas desulfurization.Therefore, the adoption of source desulphurization to blast furnace gas is an ideal method for treating sulfur species.
In the prior art, CS is hydrolyzed by adopting a hydrolysis catalyst2Conversion to H2S, then, a certain absorbent is used for absorption, hydrolysis is firstly carried out regardless of wet absorption or dry absorption, a hydrolysis catalyst is easily interfered by impurity dust and oil stain to influence the activity of the catalyst, the catalyst is poisoned, the cost of the catalyst is high, and for the wet method, the blast furnace gas after hydrolysis is absorbed by alkaline liquor, so that the heat value of the blast furnace gas is lost to a certain extent, a large amount of water vapor is brought in, and the water consumption is large.
Through searching, no patent publication related to the present patent application has been found.
Disclosure of Invention
The utility model aims to overcome the defects that in the prior art, direct hydrolysis of blast furnace gas by a blast furnace gas desulfurization process easily causes hydrolysis agent poisoning, and further influences the desulfurization process progress and desulfurization effect, and provides a blast furnace gas desulfurization ultra-clean system, application and an ultra-clean method.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a blast furnace gas desulfurization ultra-clean system comprises a flue gas adsorption system, a harmful gas release system, a gas combustion system and a wet pneumatic purification system which are sequentially connected, wherein the inlet of the flue gas adsorption system is connected with blast furnace gas, the flue gas adsorption system is also connected with a blast furnace gas user side, the flue gas adsorption system comprises an adsorbent which can directionally adsorb sulfur-containing flue gas, the flue gas after adsorption treatment can enter the blast furnace gas user side, the harmful gas release system can perform desorption operation on the adsorbent after directional absorption, the harmful gas generated after desorption can enter the gas combustion system, the gas combustion system can generate heat energy, the generated heat energy can heat the gas release system, and the wet pneumatic purification system can perform wet purification on the flue gas after combustion of the gas combustion system, smoke removalSO in gas2And obtaining the purified flue gas.
And the outlet of the harmful gas release system is connected with the inlet of the gas combustion system through a middle flue.
Moreover, the flue gas adsorption system comprises a device, an adsorbent, an inlet and outlet concentration detection device and a PC control system.
And the flue gas adsorption system is formed by superposing and combining one-stage or multi-stage flue gas absorption devices.
And the harmful gas release system is also connected with inert gas, and the inert gas is introduced into the system.
And, harmful gas release system still includes a heat recovery unit and links the setting, and this heat recovery unit can retrieve the heat energy that harmful gas release system produced, adopts this heat energy to heat gas release system.
Also, the gas combustion system uses a plasma gun for ignition.
Moreover, the wet pneumatic purification system comprises an absorbent bin, a slurry supply device, a slurry nozzle and a pneumatic reaction tower.
And the absorbent bin is filled with an absorbent.
And the absorbent comprises any one or the combination of at least two of limestone powder, calcium oxide powder, magnesium oxide and sodium hydroxide solution.
The utility model has the advantages and effects that:
1. the ultra-clean system can be used in the field of blast furnace gas ultra-clean and is used for removing main pollutants including C in carbon roasting flue gas2S, COS (carbonyl sulfide), H2S。
2. The method has the advantages of simplifying the process flow, realizing that one catalyst can absorb two pollutants simultaneously, greatly reducing the gas treatment capacity after combustion, reducing the investment scale and saving the cost.
Drawings
FIG. 1 is a process flow diagram of the blast furnace gas desulfurization ultra-clean process of the present invention.
Detailed Description
The present invention will be further described with reference to specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the utility model.
The raw materials used in the utility model are all conventional commercial products if no special description is provided, the method used in the utility model is all conventional methods in the field if no special description is provided, and the mass of all the materials used in the utility model is the conventional use mass. The structures, connection relations, etc., which are not described in detail in the present invention, can be understood as conventional technical means in the art.
A blast furnace gas desulfurization ultra-clean system is shown in figure 1, and comprises a flue gas adsorption system 1, a harmful gas release system 2, a gas combustion system 3 and a wet method pneumatic purification system 4 which are connected in sequence, wherein the inlet of the flue gas adsorption system is connected with blast furnace gas, the flue gas adsorption system is also connected with a blast furnace gas user side (not shown in the figure), the flue gas adsorption system comprises an adsorbent which can directionally adsorb sulfur-containing flue gas, the flue gas after adsorption treatment can enter the blast furnace gas user side, the harmful gas release system can perform desorption operation on the adsorbent after directional absorption, the harmful gas generated after desorption can enter the gas combustion system, the gas combustion system can generate heat energy, and the generated heat energy can heat the gas release system, the wet-process pneumatic purification system can carry out wet-process purification on the flue gas combusted by the gas combustion system to remove SO in the flue gas2And obtaining the purified flue gas.
In this embodiment, the outlet of the harmful gas release system is connected to the inlet of the gas combustion system through an intermediate flue (not shown).
In this embodiment, the flue gas adsorption system includes a device, an adsorbent, an inlet and outlet concentration detection device, and a PC control system.
Preferably, the adsorbent is an adsorbent having a strong adsorption capacity for sulfur-based groups.
Preferably, the adsorbent is a porous structure prepared by mixing one or more materials of activated carbon and zeolite and performing modification treatment, and performs directional absorption effect on sulfur-containing flue gas.
The specific modification treatment operation is as follows: taking raw material powder, oriented adsorption particles and an adhesive, wherein the raw material powder comprises the following components in percentage by weight: directional adsorption of particles: the mass ratio of the adhesive is 80-90: 2-8: 2-15, mixing the raw material powder, the directional adsorption particles and the adhesive in proportion, heating at the high temperature of 600-1100 ℃, and heating for 1-5 hours to generate the adhesive.
Preferably, the directional adsorption particles are one or a mixture of more than two of loaded metal ions or metal oxides, and the adhesive is one or a mixture of more than two of epoxy resins, phenolic resins, emulsified asphalt and formaldehyde.
Preferably, the adsorbent is surface treated to withstand high temperatures above 400 ℃. The specific treatment mode can adopt one or more of modes of surface carbonization treatment, coating treatment, surface coating, physical coating, chemical modification, chemical infiltration, surface ablation and the like.
Preferably, the flue gas adsorption system can be formed by superposing and combining one-stage or multi-stage flue gas absorption devices, so that the high-efficiency desorption and adsorption effect is achieved.
Preferably, the desorption means of the desorption operation of the harmful gas release system is a heating mode, the heating temperature is 150-260 ℃, and the harmful gas is released during heating.
Preferably, the harmful gas release system is also connected with inert gas, and inert gas is introduced into the system to prevent the adsorbent from being damaged by oxidation. Preferably, the inert gas is N2、CO2One or two of the gases are combined.
Preferably, the harmful gas release system further comprises a heat energy recovery device (not shown in the figure) connected to the heat energy recovery device, the heat energy recovery device can recover heat energy generated by the harmful gas release system, the gas release system is heated by the heat energy, the heat energy is effectively utilized, and no new energy supply is needed.
Preferably, the gas combustion system uses a plasma gun for ignition, and harmful gas is directly combusted and is not mixed with air, so that explosion accidents are avoided.
Preferably, the wet pneumatic purification system comprises an absorbent bin, a slurry supply device, a slurry nozzle and a pneumatic reaction tower.
Preferably, the lower part of pneumatic reaction tower is the air inlet, pneumatic desulfurization unit is installed on air inlet upper portion, pneumatic desulfurization unit is the pneumatic desulfurization unit disclosed in patent No. 200710175802.6(101406805B), including the blending container who plays the effect of blending gas-liquid and play discharge purification back gas passage effect that from top to bottom is equipped with in proper order, play the swirler that changes the air current and revolve to the effect and play the awl cover of gas inlet and thick liquid export effect, blending container and swirler, swirler and awl cover all pass through bolt or welded connection. The utility model has the characteristics of simple structure and easy processing, can ensure that the wet flue gas desulfurization device has the advantages of small liquid-gas ratio, small resistance, large mixing strength and high removal rate, avoids the system shutdown caused by overlarge water consumption, reduces the operation and maintenance cost, and is suitable for treating various industrial tail gases.
Preferably, the upper part of the pneumatic reaction tower is also provided with an electrostatic cyclone demisting device, the pneumatic cyclone demisting device is the device in patent No. 201510751079.6, the device consists of one or a plurality of electrostatic cyclone demisting units, each electrostatic cyclone demisting unit comprises a cylinder, guide vanes, guide plates and metal discharge wires, the flue gas to be treated enters the device from bottom to top to form rotary ascending gas, the metal discharge wires are arranged at the center of the cylinder, and the wall of the cylinder is positively charged with high voltage, so that liquid drops in the flue gas are separated from the flue gas.
Preferably, the absorbent bin is filled with an absorbent.
Preferably, the absorbent comprises any one or a combination of at least two of limestone powder, calcium oxide powder, magnesium oxide and sodium hydroxide solution.
One working principle of the blast furnace gas desulfurization ultra-clean system is as follows:
the sulfur-containing gas is directionally adsorbed, then desorbed, collected and finally removed by adopting a conventional desulfurization process after the high-concentration sulfur-containing gas is combusted.
An ultra-clean method for desulfurizing blast furnace gas comprises the following steps:
the method comprises the steps of desulfurizing blast furnace gas and adsorbing sulfur-containing gas;
the flue gas treated by the step is introduced into a blast furnace gas user side;
desorbing the adsorbent subjected to the adsorption in the step I, so that the adsorbent is recycled;
fourthly, burning the desorbed harmful gas, and heating the adsorbent by using the heat value generated by burning to realize effective utilization of energy and self-sufficiency;
step five, carrying out wet purification on the flue gas after burning to remove SO in the flue gas2And obtaining the purified flue gas.
Preferably, the desorbed harmful gas in the fourth step has a high concentration of 40-80% (volume percentage) of COS and H2S mixed gas is converted into SO after being combusted2And CO2And H2O，SO2Specific ratio of COS to H2S is easier to be absorbed by alkali liquor, the reaction rate is high, the requirement on the device is low, and the S can be absorbed by directly introducing the alkali liquor. The treatment amount is small, and the method is simple and easy to implement.
Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the utility model and the appended claims, and therefore the scope of the utility model is not limited to the embodiments disclosed.
Claims (9)
1. A blast furnace gas desulfurization ultra-clean system is characterized in that: the ultra-clean system comprises a flue gas adsorption system, a harmful gas release system, a gas combustion system and a wet pneumatic purification system which are sequentially connected, wherein an inlet of the flue gas adsorption system is connected with blast furnace gas, the flue gas adsorption system is also connected with a blast furnace gas user side, the flue gas adsorption system comprises an adsorbent which can directionally adsorb sulfur-containing flue gas, the flue gas after adsorption treatment can enter the blast furnace gas user side, the harmful gas release system can perform desorption operation on the adsorbent after directional absorption, the harmful gas generated after desorption can enter the gas combustion system, the gas combustion system can generate heat energy, the generated heat energy can heat the gas release system, and the wet pneumatic purification system can perform wet purification on the flue gas after combustion of the gas combustion system, obtaining the purified flue gas.
2. The blast furnace gas desulfurization ultra-clean system according to claim 1, characterized in that: the outlet of the harmful gas release system is connected with the inlet of the gas combustion system through a middle flue.
3. The blast furnace gas desulfurization ultra-clean system according to claim 1, characterized in that: the flue gas adsorption system comprises a device, an adsorbent, an inlet and outlet concentration detection device and a PC control system.
4. The blast furnace gas desulfurization ultra-clean system according to claim 3, characterized in that: the flue gas adsorption system is formed by superposing and combining one-stage or multi-stage flue gas absorption devices.
5. The blast furnace gas desulfurization ultra-clean system according to claim 1, characterized in that: the harmful gas release system is also connected with inert gas, and the inert gas is introduced into the system.
6. The blast furnace gas desulfurization ultra-clean system according to claim 1, characterized in that: the harmful gas release system also comprises a heat energy recovery device which is connected with the harmful gas release system, the heat energy recovery device can recover heat energy generated by the harmful gas release system, and the heat energy is adopted to heat the gas release system.
7. The blast furnace gas desulfurization ultra-clean system according to claim 1, characterized in that: the gas combustion system uses a plasma gun for ignition.
8. The blast furnace gas desulfurization ultra-clean system according to any one of claims 1 to 7, characterized in that: the wet pneumatic purification system comprises an absorbent bin, a slurry supply device, a slurry nozzle and a pneumatic reaction tower.
9. The blast furnace gas desulfurization ultra-clean system according to claim 8, characterized in that: the absorbent bin is filled with an absorbent.
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