CN214032354U - Integrated catalytic hydrolysis desulfurizing tower and integrated dry purification device - Google Patents
Integrated catalytic hydrolysis desulfurizing tower and integrated dry purification device Download PDFInfo
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- CN214032354U CN214032354U CN202022400139.9U CN202022400139U CN214032354U CN 214032354 U CN214032354 U CN 214032354U CN 202022400139 U CN202022400139 U CN 202022400139U CN 214032354 U CN214032354 U CN 214032354U
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Abstract
The utility model relates to an integration catalytic hydrolysis desulfurizing tower and integration dry purification device, pollutant control technical field who relates to environmental protection engineering technology, integration catalytic hydrolysis desulfurizing tower includes the coal gas entry, the tower shell, the catalytic hydrolysis section, desulfurization section and clean blast furnace gas discharge port, the coal gas entry sets up the top of the tower at catalytic hydrolysis desulfurizing tower and connects the import flue of catalytic hydrolysis desulfurizing tower, be used for sending into the catalytic hydrolysis section with blast furnace gas, clean blast furnace gas export sets up the bottom of the tower at catalytic hydrolysis desulfurizing tower, be used for discharging the blast furnace gas after integrated catalytic hydrolysis desulfurizing tower purifies, be filled with the hydrolysis catalyst in the catalytic hydrolysis section, be used for carrying out the hydrolysis catalysis with the blast furnace gas that lets in from the coal gas entry; the desulfurizing agent is filled in the desulfurizing section and is used for absorbing sulfur-containing gas in blast furnace gas after hydrolysis and catalytic treatment in the catalytic hydrolysis section. Therefore, the removal of sulfur-containing substances in the blast furnace gas is realized, and the problem of overproof sulfur dioxide is solved from the source.
Description
Technical Field
The utility model relates to a pollutant control technical field of environmental protection engineering technology, concretely relates to can realize integrated catalytic hydrolysis desulfurizing tower and integrated dry process purifier of the desorption of sulfur-containing substance among the blast furnace gas for realize the complete sulphur desorption of blast furnace gas in one set of technology.
Background
The blast furnace gas is used as the combustible gas with the maximum output of the steel enterprises, and the statistical output is up to 700-. The existing blast furnace gas purification and subsequent application mainly adopts bag type dust removal to remove particulate matters, and the particulate matters are sent to user units such as a blast furnace hot blast stove, a steel rolling heating furnace, gas power generation and the like to be used as fuels after TRT residual pressure power generation, but the blast furnace gas still contains harmful substances such as sulfur, chlorine and the like. Followed byAs the suggestion about promoting the implementation of the ultra-low emission in the steel industry is published, the steel industry formally enters the ultra-low emission era, and users of blast furnace hot blast stoves, steel rolling heating furnaces, gas power generation and the like all require the burning of the tail gas SO2The ultra-low emission limit is reached, and the prior blast furnace gas purification process can not meet the requirement of SO2And (5) controlling the requirements.
The current technical route mainly comprises source control and tail end treatment after combustion, if a tail end treatment mode is adopted, desulfurization facilities need to be arranged at multiple points, and meanwhile, the waste gas amount after gas combustion is large, and the scale of treatment facilities is enlarged; if a source control mode is adopted, centralized treatment can be realized, and the treated gas amount is only about 60% of the flue gas amount after combustion, so that the total investment is low, the total occupied area is small, the operation cost is low, and the management is convenient. Meanwhile, the source management promotes the service life and the combustion efficiency of the pipe network. The method implements the total sulfur removal of the blast furnace gas, reduces the sulfur content in the gas, can greatly reduce the pressure of the tail end treatment, and even saves tail end treatment facilities.
Blast furnace gas total sulfur removal is a new technical development direction, at present, a single organic sulfur hydrolysis technology and a dry adsorption removal technology are more, and a blast furnace gas dechlorination technology has related application examples, but no reports or engineering cases of the blast furnace gas total sulfur removal technology exist, so the blast furnace gas total sulfur removal technology still belongs to a front-edge exploration stage.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an integrated catalytic hydrolysis desulfurizing tower and integrated dry purification device that can realize blast furnace gas complete sulphur desorption, preferred one kind can realize COS, CS in the blast furnace gas2、 H2S、SO2The integrated catalytic hydrolysis desulfurization tower and the integrated dry purification device for removing sulfur-containing substances and removing HCl in a synergic manner are used for solving the technical problems.
According to the utility model discloses an aspect provides an integration catalytic hydrolysis desulfurizing tower for realizing blast furnace gas desulfurization entirely, its characterized in that: the integrated catalytic hydrolysis desulfurization tower comprises: coal gas inlet, tower shell, catalytic hydrolysis section, desulfurization section and clean blast furnace gas discharge port, wherein: the gas inlet is arranged at the top of the catalytic hydrolysis desulfurization tower and connected with the inlet flue of the catalytic hydrolysis desulfurization tower, and is used for feeding blast furnace gas into the catalytic hydrolysis section, and the clean blast furnace gas outlet is arranged at the bottom of the catalytic hydrolysis desulfurization tower and is used for discharging the blast furnace gas purified by the integrated catalytic hydrolysis desulfurization tower, wherein: a hydrolysis catalyst is filled in a catalytic hydrolysis section of the catalytic hydrolysis desulfurization tower and is used for carrying out hydrolysis catalysis on blast furnace gas introduced from the gas inlet; and a desulfurizing agent is filled in a desulfurization section of the catalytic hydrolysis desulfurization tower and is used for absorbing sulfur-containing gas in blast furnace gas after hydrolysis and catalytic treatment in the catalytic hydrolysis section.
According to the utility model discloses a further aspect provides an integration dry purification device for realizing the complete sulphur desorption of blast furnace gas, its characterized in that, it includes pneumatic conveyor and at least one foretell integration catalysis desulfurizing tower of hydrolysising, wherein, pneumatic conveyor connects at least one integration catalysis desulfurizing tower of hydrolysising for send the desulfurizer into the desulfurization section.
According to another aspect of the present invention, there is provided an integrated dry purification method for achieving total sulfur removal of blast furnace gas, comprising the steps of: performing catalytic hydrolysis treatment, namely introducing the blast furnace gas at the inlet into a catalytic hydrolysis section of a catalytic hydrolysis desulfurization tower, and catalytically converting carbonyl sulfide and carbon disulfide in the blast furnace gas into hydrogen sulfide by using a catalyst filled in the catalytic hydrolysis section; performing desulfurization treatment, wherein the generated hydrogen sulfide enters a desulfurization section of a catalytic hydrolysis desulfurization tower along with the blast furnace gas, and a desulfurizer filled in the desulfurization section absorbs the hydrogen sulfide, sulfur dioxide and hydrogen chloride to remove sulfur-containing substances and hydrogen chloride in the blast furnace gas; and discharging clean blast furnace gas, and discharging the blast furnace gas treated by the integrated catalytic hydrolysis desulfurization tower through a clean blast furnace gas discharge port of the catalytic hydrolysis desulfurization tower.
Correspondingly, through the utility model discloses, the clean coal gas after the processing is discharged from the bottom of the tower, merges into the pipe network, has realized the desorption of including the sulphur material in the blast furnace gas from this, solves SO from the source2And (4) exceeding the standard.
In addition, in the present invention, COS and CS in the blast furnace gas2Is catalytically converted into H in a catalytic hydrolysis stage2S; the desulfurizing agent in the desulfurizing section absorbs sulfur-containing gas in the coal gas, thereby realizing the removal of sulfur-containing substances in the blast furnace gas. More preferably, the desulfurizing agent in the desulfurization section absorbs H in the coal gas2S、SO2And HCl and other acidic gases, so that the corrosion problem of the gas pipeline is controlled to a certain extent by the synergistic removal of HCl.
The utility model provides an integrated catalytic hydrolysis desulfurizing tower and an integrated dry purifying device which have simple technical process, low manufacturing cost and good reliability, and can realize the desulfurization in blast furnace gas in a temperature range of 40-150 ℃.
Further: the utility model also provides a H in blast furnace gas is realized simultaneously2S、SO2The integrated catalytic hydrolysis desulfurization tower for removing HCl and other acidic gases and the integrated dry purification device. In the integrated dry purification apparatus of the present invention, the COS and the CS are first integrated2Isoorganosulfur catalytic conversion to H2S, then absorbing H in the coal gas by a desulfurizer in a desulfurization section2S、SO2And acid gases such as HCl. The device can provide accurate process layout scheme and operation parameters for controlling the sulfur pollutants in the blast furnace gas for steel mills and environmental protection companies, and solve the problem of SO from the source2The problem of exceeding standard is solved, meanwhile, the problem of corrosion of the gas pipeline is controlled to a certain extent by the synergistic removal of HCl, the process is simple, the reliability is good, the operation is stable, and the pollutant control cost is reduced.
Drawings
FIG. 1 is a structural diagram of an integrated catalytic hydrolysis desulfurization tower for achieving total sulfur removal of blast furnace gas;
FIG. 2 is an operational schematic diagram of the integrated dry purification apparatus for achieving total sulfur removal of blast furnace gas of the present invention;
FIG. 3 is a layout diagram of the integrated dry purification device for realizing total sulfur removal of blast furnace gas;
FIG. 4 is a flow chart of the integrated dry scrubbing process of the present invention for achieving total sulfur removal from blast furnace gas; and
FIG. 5 is a process diagram of the integrated dry cleaning method for realizing total sulfur removal of blast furnace gas.
Detailed Description
The present invention will now be described in detail with reference to the drawings, wherein like reference numerals represent like parts, and wherein: 1-inlet blast furnace gas, 2-catalytic hydrolysis section feed inlet, 3-catalyst support net, 4-catalytic hydrolysis section discharge outlet, 5-desulfurizer inlet, 6-inlet shutoff valve I, 7-inlet buffer bin, 8-replacement gas interface 1, 9-gas replacement valve 1, 10-inlet shutoff valve II, 11-diffusion interface 1, 12-diffusion valve 1, 13-observation window, 14-reaction bin, 15-rapping motor, 16-outlet shutoff valve I, 17-diffusion valve 2, 18-diffusion interface 2, 19-outlet buffer bin, 20-outlet shutoff valve II, 21-desulfurizer outlet, 22-replacement gas interface 2, 23-gas replacement valve 2, 24-desulfurizer support net, 25-blast furnace gas discharge outlet, 26-inlet gas shut-off valves 1, 27-inlet gas shut-off valves 2, 28-outlet gas shut-off valves 1, 29-outlet gas shut-off valves 2, 30-pneumatic conveying devices, 31-manholes, 32-blow-off valves 3, 33-gas replacement valves 3, 34-gas inlets, 35-clean blast furnace gas discharge ports and 36-tower shells.
As shown in figure 1, the integrated catalytic hydrolysis desulfurization tower for realizing total sulfur removal of blast furnace gas comprises a gas inlet 34, a tower shell 36, a catalytic hydrolysis section, a desulfurization section and a clean blast furnace gas discharge port 35. A gas inlet 34 at the top end of the tower shell is connected with an inlet flue of the catalytic hydrolysis desulfurization tower and is used for feeding blast furnace gas into a catalytic hydrolysis section; and a clean blast furnace gas discharge port 35 is arranged below the desulfurization section and used for discharging the blast furnace gas purified by the integrated catalytic hydrolysis desulfurization tower.
The catalytic hydrolysis section is provided with a catalyst supporting net 3, a catalyst feeding port 2, a catalyst discharging port 4 and a manhole 31; the catalyst supporting net 3 is arranged in the tower shell and used for supporting the hydrolysis catalyst; be provided with charge door 2 and discharge opening 4 on the tower shell for reinforced and unload the catalyst of hydrolysising, catalytic hydrolysis section top is provided with access hole 31, is used for maintainer to advance the tower maintenance under the accident condition.
The desulfurization section is provided with a reaction bin 14, preferably further comprises a desulfurizing agent online replacement system, and is sequentially provided with a desulfurizing agent inlet 5, an inlet shutoff valve I6, an inlet buffer bin 7, an inlet shutoff valve II 10, an outlet shutoff valve I16, an outlet buffer bin 19, an outlet shutoff valve II 20 and a desulfurizing agent outlet 21 from top to bottom; the side surfaces of the inlet buffer bin 7 and the outlet buffer bin 19 are respectively provided with a replacement gas interface 8, 22 and a diffusion interface 11, 18, which are used for replacing and diffusing coal gas in the buffer bins by nitrogen or other inert gases before the desulfurizer is replaced, thereby ensuring the site safety. The two side surfaces of the inlet buffer bin 7, the reaction bin 14 and the outlet buffer bin 19 are respectively provided with a rapping motor 15, and the walls of the bins are periodically rapped to keep the fluidization state of the desulfurizer. And an observation hole 13 is formed in the tower wall between the desulfurization section and the catalytic hydrolysis section, so that the condition in the bin can be observed in real time in the operation process. A desulfurizer supporting net 24 is arranged below the reaction bin of the desulfurization section and used for supporting the desulfurizer, and a clean blast furnace gas discharge port 35 is arranged below the desulfurizer supporting net 24 and used for discharging the blast furnace gas purified by the reaction tower.
In the utility model, the catalytic hydrolysis section is provided with an inlet flue, a catalyst supporting net 3, a catalyst charging port 2, a catalyst discharging port 4 and an access hole 31, and the top end of the tower shell is connected with the inlet flue of the catalytic hydrolysis desulfurizing tower and is used for sending blast furnace gas into the catalytic hydrolysis section; the catalyst supporting net 4 is arranged in the tower shell and used for supporting the hydrolysis catalyst; be provided with charge door 2 and discharge opening 4 on the tower shell for reinforced and unload the catalyst of hydrolysising, catalytic hydrolysis section top is provided with access hole 31, is used for maintainer to advance the tower maintenance under the accident condition.
Preferably, in the utility model, the catalyst is one or more of honeycomb, rod, raschig ring and ball, carbonyl sulfide (COS) and carbon disulfide (CS) in the blast furnace gas2) Catalytic conversion to H by iso-organic sulfur hydrolysis2S, the active component of the catalyst is one or more of Na, K, Fe, Cu and Ni salt, and the carrier is one or more of activated alumina, activated carbon, cordierite and hydrotalcite-like compound.
The configuration of the catalyst is Raschig ringWhen the catalyst is in a shape of a sphere, the catalyst is preferably randomly stacked on the catalyst support net (3) in the catalytic hydrolysis section from large to small, and the catalyst is filled in a certain volume, so that the space velocity of the catalytic reaction is 500-4000h-1The gas flow rate is 0.5-2 m/s; preferably, 80-95% volume fraction of carbonyl sulfide (COS) and carbon disulfide (CS) in the blast furnace gas in the catalytic hydrolysis section2) Is catalytically converted into H2S。
Preferably, the gas pressure of the desulfurization section is reduced, the abrasion of the desulfurizer is small, the gas-solid two phases are uniformly contacted, and the residence time adjustment elasticity of the desulfurizer is large. The flow velocity of gas in the desulfurization section is controlled to be 0.5-3m/s, so that the uniform air distribution is ensured; preferably, the inlet temperature of the blast furnace gas is 40-150 ℃, and the outlet temperature is basically kept unchanged.
Preferably, in the present invention, the desulfurizing agent is a porous column type, the carrier is a mixture of zeolite and pumice, and the mole ratio of the pumice to the zeolite is between 0.2 and 0.5; the active ingredient is mainly one or more of ferric oxide, manganese oxide, potassium hydroxide and sodium carbonate, wherein the active ingredient accounts for 3-10% of the mass fraction of the desulfurizer. The desulfurizer is filled in a certain volume, so that the desulfurization reaction airspeed is 500-5000h-1And ensures the high-efficiency removal of pollutants in blast furnace gas.
As shown in FIGS. 2 and 3, the integrated dry purification device for removing all sulfur from blast furnace gas is preferably one for removing COS and CS in blast furnace gas2、H2S、SO2The integrated dry purification device for removing sulfur-containing substances and removing HCl in a synergistic manner comprises a pneumatic conveying device 30 and at least one integrated catalytic hydrolysis desulfurization tower; the pneumatic conveying device 30 is connected with the integrated catalytic hydrolysis desulfurization tower and is used for conveying a desulfurizer into a desulfurization section of the integrated catalytic hydrolysis desulfurization tower; the catalytic hydrolysis section of the integrated catalytic hydrolysis desulfurization tower is filled with a hydrolysis catalyst for carrying out hydrolysis catalysis on blast furnace gas introduced from the upper part of the tower, and the desulfurization section is filled with a desulfurizing agent for absorbing hydrogen sulfide (H) in the blast furnace gas after the hydrolysis catalysis treatment2S), sulfur dioxide (SO)2) Hydrogen chloride (HCl) and other acid gases, a clean blast furnace gas discharge port 35 is arranged at the bottom of the tower and is used for removing the hydrogen chloride (HCl) and other acid gases through integrated catalytic hydrolysisThe blast furnace gas treated by the sulfur tower is discharged through a clean blast furnace gas discharge port and is sent into a blast furnace gas pipe network.
As shown in figures 2 and 3, 4 integrated catalytic hydrolysis desulfurization towers 3 are provided with 1, the switching of the reaction towers is realized by opening and closing inlet gas stop valves 26 and 27 and outlet gas stop valves 28 and 29 during the operation process of the catalytic hydrolysis desulfurization towers, and the 4 towers alternately perform desulfurizer replacement at certain time intervals to ensure the desulfurization effect. And in the normal operation process, the first inlet shutoff valve 6, the second inlet shutoff valve 10, the first outlet shutoff valve 16 and the second outlet shutoff valve 20 are in a closed state. If the desulfurizer needs to be replaced, firstly opening a first outlet shutoff valve 16, discharging the desulfurizer in the reaction bin 14 into a first outlet buffer bin 19, then closing the first outlet shutoff valve 16, opening a gas replacement valve 23 and a relief valve 17, introducing nitrogen or other inert gases into the first outlet buffer bin 19, and replacing and relieving the coal gas in the outlet buffer bin; then closing the gas replacement valve 23 and the blow-off valve 17, opening the second outlet shutoff valve 20, discharging the desulfurizer in the outlet buffer bin 19 through a desulfurizer outlet 21, transporting the desulfurizer away by a truck, and closing the second outlet shutoff valve 20; next, adding the desulfurizer conveyed by the truck into a desulfurizer inlet 5 through a pneumatic conveying device 30, opening a gas replacement valve 9 and a diffusion valve 12, introducing nitrogen or other inert gases into an inlet buffer bin 7, and replacing and diffusing coal gas in a discharge bin; and then closing the gas replacement valve 9 and the blow-off valve 12, opening the first inlet shutoff valve 6, discharging the desulfurizing agent into the inlet buffer bin 7, closing the first inlet shutoff valve 6, opening the second inlet shutoff valve 10, discharging the desulfurizing agent into the reaction bin 14, and closing the second inlet shutoff valve 10 to finish the desulfurizing agent replacement process. The blast furnace gas can not leak by adopting a buffer bin and a gas replacement mode, and the operation safety of the system is ensured. If the integrated catalytic hydrolysis desulfurization tower needs to be overhauled, after the desulfurizing agent is emptied according to the mode, the first inlet shutoff valve 6, the second outlet shutoff valve 20, the coal gas inlet shutoff valves 26 and 27 and the coal gas outlet shutoff valves 28 and 29 are closed, the second inlet shutoff valve 10 and the first outlet shutoff valve 16 are opened, the gas replacement valves 9, 23 and 33 and the diffusion valves 12, 17 and 32 are opened, nitrogen or other inert gases are introduced into the whole tower to replace and diffuse the coal gas in the tower, and then the whole system is purged by compressed air to ensure the safety of maintainers.
Preferably, in the utility model, the configuration of the catalyst is one or more of honeycomb, rod, raschig ring and ball, carbonyl sulfide (COS) and carbon disulfide (CS) in the blast furnace gas2) Catalytic conversion to H by iso-organic sulfur hydrolysis2S, the active component of the catalyst is one or more of Na, K, Fe, Cu and Ni salt, and the carrier is one or more of activated alumina, activated carbon, cordierite and hydrotalcite-like compound. The catalyst is Raschig annular catalyst, which is scattered and stacked from large to small on the catalyst support net 3 in the catalytic hydrolysis section, and the catalyst is filled with a certain volume, so that the space velocity of the catalytic reaction is 500-4000h-1The gas flow rate is 0.5-2 m/s; preferably, 80-95% volume fraction of carbonyl sulfide (COS) and carbon disulfide (CS) in the blast furnace gas in the catalytic hydrolysis section2) Is catalytically converted into H2And S. The gas pressure of the desulfurization section is reduced, the desulfurizer is less worn, the gas-solid two phases are uniformly contacted, and the residence time adjustment elasticity of the desulfurizer is large. The flow velocity of gas in the desulfurization section is controlled to be 0.5-3m/s, so that the uniform air distribution is ensured; preferably, the inlet temperature of the blast furnace gas is 40-150 ℃, and the outlet temperature is basically kept unchanged. The desulfurizer is porous column type, the carrier is a mixture of zeolite and pumice, and the mol ratio of the pumice to the zeolite is between 0.2 and 0.5; the active ingredient is mainly one or more of ferric oxide, manganese oxide, potassium hydroxide and sodium carbonate, wherein the active ingredient accounts for 3-10% of the mass fraction of the desulfurizer. The desulfurizer is filled in a certain volume, so that the desulfurization reaction airspeed is 500-5000h-1And ensures the high-efficiency removal of pollutants in blast furnace gas.
It should be noted that, although the above description describes the embodiment in which the integrated dry purification device includes 3 and 1 integrated catalytic hydrolysis desulfurization towers 3, the integrated dry purification device of the present invention may only include 1 integrated catalytic hydrolysis desulfurization tower, and the desulfurization purpose can also be achieved.
The dry cleaning method of the present invention for removing total sulfur from blast furnace gas, preferably for removing COS and CS from blast furnace gas, will be described with reference to FIG. 42、H2S、SO2The method comprises the following steps of (1) removing sulfur-containing substances and cooperatively removing HCl, preferably, the purification method adopts a dry purification device for realizing the total sulfur removal of blast furnace gas as shown in FIGS. 2 and 3; the utility model discloses an integration dry purification method includes following step:
(1) the blast furnace gas 1 at the inlet firstly enters a catalytic hydrolysis section of the integrated catalytic hydrolysis desulfurization tower for treatment, and COS and CS in the blast furnace gas are treated by a catalyst filled in the catalytic hydrolysis section2Catalytic conversion to H2S；
(2) Generation of H2S enters the desulfurization section along with the blast furnace gas, and the desulfurizer is sent into the desulfurization section through the pneumatic conveying system 30 to absorb H2S、SO2HCl and other acidic gases, thereby realizing the removal of sulfur-containing substances in the blast furnace gas;
(3) the blast furnace gas treated by the integrated catalytic hydrolysis desulfurization tower is discharged through the clean blast furnace gas discharge port 25 and sent into a blast furnace gas pipe network, thereby realizing the desulfurization of the blast furnace gas.
Preferably, the operation process is carried out according to H in outlet gas2The concentration of S adjusts the replacement frequency of the desulfurizer, realizes the removal of sulfur-containing substances in blast furnace gas, and solves the problem of SO from the source2The problem of exceeding standard is solved, and meanwhile, the corrosion problem of the gas pipeline is controlled to a certain extent by the synergistic removal of HCl.
The process of the utility model is shown in figure 5: combustible gas (containing nitrogen (N)) as byproduct in blast furnace iron-making production process2) Carbon monoxide (CO) and carbon dioxide (CO)2) Hydrogen (H)2) Hydrocarbons, small amounts of sulfur-containing compounds and dust) through gravity dust removal, bag dust removal, and a residual pressure turbine power plant (TRT), as the inlet blast furnace gas 1 of the purification method of the present invention. Blast furnace gas passes through an integrated catalytic hydrolysis desulfurization tower, a catalyst is filled in the upper half part of the tower catalytic hydrolysis section, the catalyst takes one or more of active alumina, active carbon, cordierite and hydrotalcite-like compound as a carrier, one or more of Na, K, Fe, Cu and Ni salt as an active ingredient, and the configuration of the catalyst is a Raschig annular catalyst. Catalyst loading oneThe volume is determined, so that the space velocity of the catalytic reaction is 500--1The gas flow rate is 0.5-2m/s, so that 80-95% of COS and CS in the blast furnace gas in volume fraction in the catalytic hydrolysis section2Is catalytically converted into H2S, and then enters the lower half desulfurization section of the tower in the figure 2. A desulfurizing agent is filled in the desulfurizing section, the desulfurizing agent is in a porous column shape, the carrier is a mixture of zeolite and pumice, and the molar ratio of the pumice to the zeolite is between 0.2 and 0.5; the active ingredient is mainly one or more of ferric oxide, manganese oxide, potassium hydroxide and sodium carbonate, wherein the active ingredient accounts for 3-10% of the mass fraction of the desulfurizer. The desulfurizer is filled in a certain volume, so that the desulfurization reaction airspeed is 500-5000h-1And ensures the high-efficiency removal of pollutants in blast furnace gas.
In the catalytic hydrolysis section, the blast furnace gas and the moisture react under the action of a catalyst as follows:
COS+H20＝CO2+H2S；
CS2+H20＝COS+H2S；
CS2+2H2O＝2H2S+CO2。
h produced by subsequent reaction2S and small amount of HCl and SO in blast furnace gas2And (3) enabling the acid gas to react with the desulfurizer in the desulfurization section as follows:
Fe2O3.H2O+3H2S＝Fe2S3.H2O+3H2O
MnO+H2S＝MnO+H2O
H2S+2KOH＝K2S+2H2O，SO2+2KOH＝K2SO3+H2O，HCl+KOH＝KCl+H2O
H2S+2Na2CO3＝Na2S+2NaHCO3，SO2+2Na2CO3+H2O＝2NaHCO3+Na2SO3， HCl+Na2CO3＝NaCl+NaHCO3
O2exist ofWhen it is Na2SO3Can be oxidized to Na2SO4。
Example (c):
the blast furnace gas of a certain steel mill is tried, the utility model discloses a purifier and method, integrated catalytic hydrolysis desulfurizing tower import coal gas temperature is 90 ℃, COS and CS2The content is 120mg/Nm3，H2S content of 50mg/Nm3The inlet gas flow rate is 5000Nm3H, 2.5m is filled in the catalytic hydrolysis section3The cross-sectional area of the catalyst perpendicular to the flow direction of the flue gas is 1.5m2The gas flow rate in the catalytic hydrolysis section is 1m/s, and the gas passes through the catalytic hydrolysis section, COS and CS2Catalytic conversion to H2The proportion of S was 91%. Generation of H2S enters a desulfurization section along with blast furnace gas, a gas channel of the desulfurization section is circular, the diameter of the gas channel is 1.5m, and the apparent flow velocity of the gas is 0.9 m/S. 4 integrated catalytic hydrolysis desulfurizing towers are arranged in total, 1 device is used for 3, and the total volume of a single tower is 10m3The outlet gas temperature was 85 ℃. After the purification process of the drying method, COS and CS2Conversion efficiency is greater than 90%, and outlet H2S concentration lower than 15mg/Nm3。
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (6)
1. An integrated catalytic hydrolysis desulfurizing tower is characterized in that: the integrated catalytic hydrolysis desulfurization tower comprises: a gas inlet (34), a tower shell (36), a catalytic hydrolysis section, a desulfurization section, and a clean blast furnace gas discharge (35), wherein:
the gas inlet (34) is arranged at the top of the catalytic hydrolysis desulfurization tower, connected with the inlet flue of the catalytic hydrolysis desulfurization tower and used for feeding blast furnace gas into the catalytic hydrolysis section, and the clean blast furnace gas outlet (35) is arranged at the bottom of the catalytic hydrolysis desulfurization tower and used for discharging the blast furnace gas purified by the integrated catalytic hydrolysis desulfurization tower, wherein:
a hydrolysis catalyst is filled in the catalytic hydrolysis section of the catalytic hydrolysis desulfurization tower and is used for carrying out hydrolysis catalysis on blast furnace gas introduced from the gas inlet (34); and a desulfurizing agent is filled in a desulfurization section of the catalytic hydrolysis desulfurization tower and is used for absorbing sulfur-containing gas in blast furnace gas after hydrolysis and catalytic treatment in the catalytic hydrolysis section.
2. The integrated catalytic hydrolysis desulfurization tower of claim 1, wherein the catalytic hydrolysis section comprises a catalyst support screen (3), a catalyst feed opening (2), a catalyst discharge opening (4), and a manhole (31), wherein: the catalyst supporting net (3) is arranged in the tower shell and is used for supporting a hydrolysis catalyst; the catalyst feeding port (2) and the catalyst discharging port (4) are arranged on the tower shell and are used for feeding and discharging hydrolysis catalyst; the access hole (31) is arranged above the catalytic hydrolysis section and is used for maintenance of access personnel entering the tower under accident conditions;
the desulfurization section is provided with a reaction bin (14), and a desulfurizer supporting net (24) is arranged in the reaction bin and used for supporting a desulfurizer; and
and an observation hole (13) is formed in the tower wall between the desulfurization section and the catalytic hydrolysis section and used for observing the condition in the reaction bin (14) in real time.
3. The integrated catalytic hydrolysis desulfurization tower of claim 2, further comprising an online desulfurizer replacement system for online replacement of the desulfurizer in the desulfurization section, the online desulfurizer replacement system comprising: a desulfurizer inlet (5), an inlet shutoff valve I (6), an inlet buffer bin (7), an inlet shutoff valve II (10), an outlet shutoff valve I (16), an outlet buffer bin (19), an outlet shutoff valve II (20) and a desulfurizer outlet (21) which are sequentially arranged in the desulfurization section from top to bottom; and the gas replacement and diffusion system comprises replacement gas interfaces (8, 22) and diffusion interfaces (11, 18) which are respectively arranged on the side surfaces of the inlet buffer bin (7) and the outlet buffer bin (19), and is used for replacing and diffusing the coal gas in the buffer bins by nitrogen before the desulfurizer is replaced.
4. The integrated catalytic hydrolysis desulfurization tower of claim 3, wherein rapping motors (15) are disposed on two sides of the inlet buffer bin (7), the reaction bin (14) and the outlet buffer bin (19) for periodically rapping walls of the bins to maintain a fluidized state of the desulfurizing agent.
5. An integrated dry purification device, characterized in that it comprises a pneumatic conveying device (30) and at least one integrated catalytic hydrolysis desulfurization tower as claimed in one of the preceding claims 1 to 4, wherein the pneumatic conveying device (30) is connected to the at least one integrated catalytic hydrolysis desulfurization tower for feeding a desulfurizing agent into the desulfurization section.
6. The integrated dry purification device according to claim 5, wherein the integrated dry purification device comprises 4 integrated catalytic hydrolysis desulfurization towers, the 4 integrated catalytic hydrolysis desulfurization towers 3 are provided with 1, the switching of the integrated catalytic hydrolysis desulfurization towers is realized by opening and closing the inlet gas shut-off valves (26 and 27) and the outlet gas shut-off valves (28 and 29) during the operation process of the gas, and the 4 towers alternately perform desulfurizer replacement at time intervals.
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| CN117358056A (en) * | 2023-10-18 | 2024-01-09 | 河北创洁环保工程有限公司 | Gas purifying device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117358056A (en) * | 2023-10-18 | 2024-01-09 | 河北创洁环保工程有限公司 | Gas purifying device and method |
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