Carbonyl sulfide adsorption device for blast furnace gas

Abstract

A carbonyl sulfide adsorption device for blast furnace gas comprises an adsorption tower, the adsorption tower is provided with an adsorption tower inlet, an adsorption tower outlet and a condensate water outlet, the adsorption tower inlet of the adsorption tower is connected with an inlet pipe, and the inlet pipe is sequentially provided with a first sulfur detection device, a first butterfly valve, a first blind plate valve, a first pressure detection device and a first temperature detection device. An adsorption tower outlet of the adsorption tower is connected with an outlet pipe; a second blind plate valve, a second butterfly valve, a second pressure detection device, a second temperature detection device and a second sulfur detection device are sequentially arranged on the outlet pipe. The first sulfur detection device and the second sulfur detection device can respectively monitor the sulfur content before and after coal gas enters the adsorption tower, the first pressure detection device and the second pressure detection device can monitor the pressure before and after the coal gas enters the adsorption tower, and the first temperature detection device and the second temperature detection device can monitor the temperature before and after the coal gas enters the adsorption tower; therefore, inlet and outlet of the coal gas can be well monitored and controlled.

Description

Technical Field

[0001] The utility model relates to the field of chemistry, in particular to a waste gas treatment technology, in particular to a carbonyl sulfide adsorption device for blast furnace gas. Background Art

[0002] The Ministry of Ecology and Environment issued the "Opinions on Promoting the Implementation of Ultra-low Emissions in the Steel Industry" (Ministry of Ecology and Environment

[2019] No. 35), which clearly proposed for the first time to "strengthen source control, and implement fine desulfurization of blast furnace gas and coke oven gas", and at the same time put forward more stringent standards for the emission of SO2 from the end flue gas. Higher requirements have been put forward for the ultra-low emission indicators of steel enterprises, and key areas for air pollution prevention and control such as Beijing-Tianjin-Hebei and surrounding areas, the Yangtze River Delta, and the Fenwei Plain have taken the lead in promoting it. The SO2 emission limit for sintering and self-provided power plants is 35mg / Nm 3 The SO2 emission limit for hot blast furnaces for iron making, heat treatment furnaces for steel rolling, and dry quenching of coke making is 50mg / Nm 3 The emission limit of SO2 from the chimney of coking coke oven is 30mg / Nm 3 In combination with ultra-low emissions from the steel industry, Tangshan, Handan and other regions in Hebei Province proposed that the total sulfur content of blast furnace gas and coke oven gas should be less than 20 mg / Nm 3 The SO2 concentration emitted by hot blast furnaces and steel rolling heating furnaces in domestic steel plants is generally 60-150 mg / Nm 3 There is still some gap from the ultra-low emission requirements, and the need to implement ultra-low emission transformation is imminent.

[0003] At present, there are four existing processes for blast furnace gas desulfurization:

[0004] 1. Hydrolysis + iron oxide adsorption fine desulfurization process: the operation and maintenance process is complex, the operation requirements are refined, the energy consumption is high, the desulfurization efficiency is low, the safety is poor, the adsorbent service life is only about half a year, the replacement is frequent, the by-products are difficult to handle, the system operation resistance is large, and the back pressure of the blast furnace TRT is increased in disguise, affecting the power generation of TRT;

[0005] 2. Hydrolysis + activated coke adsorption fine desulfurization process: high operating cost, complex operation and maintenance process, refined operation requirements, high energy consumption, short service life of adsorbent, activated carbon cannot be reused (not environmentally friendly), must be carried out under aerobic conditions, easy to pulverize in blast furnace gas, causing downstream gas users to exceed dust standards, high temperature is required for analysis, and there is a risk of fire;

[0006] 3. Organic amine wet fine desulfurization process: high operating cost, complex operation and maintenance process, refined operation requirements, high energy consumption, problems in wet desulfurization, difficult wastewater treatment, extremely corrosive and easy to clog, organic amines are carcinogenic, and the gas temperature is reduced after wet spraying, resulting in a lower calorific value of the gas;

[0007] 4. Hydrolysis + alkaline washing neutralization + slag flushing wet fine desulfurization process: high operating cost, complex operation and maintenance process, refined operation requirements, high energy consumption, problems in wet desulfurization, difficult wastewater treatment, extremely corrosive and easy to clog. At present, blast furnace slag flushing water is recycled, hydrogen sulfide is reversible, and hydrogen sulfide escapes into the atmosphere during slag flushing. The gas temperature is reduced after wet spraying, resulting in a gas calorific value of about 10%.

[0008] In addition, the desulfurization device in the prior art cannot monitor the sulfur content, temperature, pressure and other conditions of the coal gas before and after desulfurization, which makes it difficult to monitor and control the inflow and outflow of the coal gas. Summary of the invention

[0009] The utility model aims to provide a carbonyl sulfide adsorption device for blast furnace gas, which solves the technical problem that the desulfurization device in the prior art cannot monitor the sulfur content, temperature, pressure and other states of the gas before and after desulfurization, resulting in difficulty in monitoring and controlling the inlet and outlet of the gas.

[0010] The utility model discloses a carbonyl sulfide adsorption device for blast furnace gas, comprising an adsorption tower, wherein an adsorption tower inlet, an adsorption tower outlet and a condensed water outlet are arranged on the adsorption tower, the adsorption tower inlet of the adsorption tower is connected with an inlet pipe, a first sulfur measuring device, a first butterfly valve, a first blind plate valve, a first pressure detecting device and a first temperature detecting device are arranged in sequence on the inlet pipe, the adsorption tower outlet of the adsorption tower is connected with an outlet pipe, a second blind plate valve, a second butterfly valve, a second pressure detecting device, a second temperature detecting device and a second sulfur measuring device are arranged in sequence on the outlet pipe, and a gate valve is arranged at the condensed water outlet of the adsorption tower.

[0011] Furthermore, the adsorption tower includes a skirt, a cylinder is arranged on the skirt, the adsorption tower inlet is arranged on the side wall of the cylinder, a supporting grid is arranged in the cylinder, an adsorbent filler is arranged on the supporting grid, a feed hole and a discharge hole are arranged in the side wall of the cylinder above the supporting grid, the feed hole is located above the discharge hole, the adsorption tower outlet is arranged at the top of the cylinder, and the condensate discharge port is arranged at the bottom of the cylinder.

[0012] Furthermore, an elliptical head is provided at the upper end of the cylinder, and a lifting ear is provided on the outer wall of the elliptical head.

[0013] Furthermore, an anti-vortex device is provided on the condensate discharge port.

[0014] Furthermore, the bottom of the skirt is connected to an electrostatic grounding plate.

[0015] Furthermore, a filler support is provided between the lower side of the support grid and the cylinder.

[0016] Furthermore, the adsorbent is a nano-micro adsorbent.

[0017] Furthermore, the first butterfly valve and the second butterfly valve are both manual butterfly valves, the first blind plate valve and the second blind plate valve are both manual blind plate valves, and the gate valve is a manual gate valve.

[0018] Compared with the prior art, the utility model has a positive and obvious effect. The first sulfur measuring device and the second sulfur measuring device can respectively monitor the sulfur content of the coal gas before and after entering the adsorption tower, the first pressure detection device and the second pressure detection device can monitor the pressure of the coal gas before and after entering the adsorption tower, and the first temperature detection device and the second temperature detection device can monitor the temperature of the coal gas before and after entering the adsorption tower, so as to better monitor and control the inlet and outlet of the coal gas. The condensed water generated in the adsorption tower is discharged through the condensed water outlet, and the gate valve can better control the discharge of the condensed water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of a carbonyl sulfide adsorption device for blast furnace gas.

[0020] Figure 2 The utility model is a schematic diagram of an adsorption tower in a carbonyl sulfide adsorption device for blast furnace gas. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with an embodiment, but the present invention is not limited to the embodiment. Any similar structure and similar changes of the present invention should be included in the protection scope of the present invention. The use of directions such as up, down, front, back, left, and right in the present invention is only for the convenience of clear description and is not a limitation on the technical solution of the present invention.

[0022] like Figure 1 and Figure 2 As shown, a carbonyl sulfide adsorption device for blast furnace gas of the utility model comprises an adsorption tower 11, on which an adsorption tower inlet 3, an adsorption tower outlet 15 and a condensed water outlet 14 are provided, the adsorption tower inlet 3 of the adsorption tower 11 is connected with an inlet pipe 16, on which a first sulfur measuring device 17, a first butterfly valve 18, a first blind plate valve 19, a first pressure detecting device 20 and a first temperature detecting device 21 are sequentially provided, the adsorption tower outlet 15 of the adsorption tower 11 is connected with an outlet pipe 22, on which a second blind plate valve 23, a second butterfly valve 24, a second pressure detecting device 25, a second temperature detecting device 26 and a second sulfur measuring device (not shown in the figure) are sequentially provided, and the condensed water outlet 14 of the adsorption tower 11 is provided with a gate valve (not shown in the figure).

[0023] Furthermore, the adsorption tower 11 includes a skirt 5, a cylinder 2 is arranged on the skirt 5, the adsorption tower inlet 3 is arranged on the side wall of the cylinder 2, a support grid 8 is arranged in the cylinder 2, an adsorbent filler 9 is arranged on the support grid 8, a feed hole 12 and a discharge hole 13 are arranged in the side wall of the cylinder 2 above the support grid 8, the feed hole 12 is located above the discharge hole 13, the adsorption tower outlet 15 is arranged at the top of the cylinder 2, and the condensate discharge port 14 is arranged at the bottom of the cylinder 2.

[0024] Furthermore, an elliptical head 10 is provided at the upper end of the cylinder 2, and a lifting lug 1 is provided on the outer wall of the elliptical head 10.

[0025] Furthermore, an anti-vortex device 4 is provided on the condensate discharge port 14 .

[0026] Furthermore, the bottom of the skirt 5 is connected to an electrostatic grounding plate 6 .

[0027] Furthermore, a filler support 7 is provided between the lower side of the support grid 8 and the cylinder 2 .

[0028] Furthermore, the adsorbent is a nano-micro adsorbent.

[0029] Furthermore, the first butterfly valve 18 and the second butterfly valve 24 are both manual butterfly valves, the first blind plate valve 19 and the second blind plate valve 23 are both manual blind plate valves, and the gate valve is a manual gate valve.

[0030] Specifically, the support grid 8 is formed by welding thinner parts, the height of the weld legs of all fillet welds is the thickness of the thinner parts, and the welding is continuous, and after being installed with the cylinder 2, it is tied with stainless steel wire.

[0031] Specifically, the sulfur measuring device, butterfly valve, blind plate valve, pressure detection device, temperature detection device, support grid 8, adsorbent filler 9, anti-eddy current device 4, nano-micro adsorbent, etc. in this embodiment all adopt well-known solutions in the prior art, which are well known to those skilled in the art and will not be described in detail here.

[0032] The working principle of this embodiment:

[0033] The gate valve is connected to the condensate collection pool through the gas drainer. During operation, the gas enters the adsorption tower 11 from the inlet pipe 16 and the adsorption tower inlet 3, is desulfurized by the adsorption of the adsorbent filler 9, and is discharged from the adsorption tower outlet 15 and the outlet pipe 22. During operation, the first sulfur measuring device 17 and the second sulfur measuring device can respectively monitor the sulfur content of the gas before and after entering the adsorption tower 11, the first pressure detection device 20 and the second pressure detection device 25 can monitor the pressure before and after the gas enters the adsorption tower 11, and the first temperature detection device 21 and the second temperature detection device 26 can monitor the temperature before and after the gas enters the adsorption tower 11, so as to better monitor the in and out of the gas. The condensate generated in the adsorption tower 11 is discharged through the condensate outlet 14, and the gate valve can better control the discharge of the condensate. The anti-vortex device 4 can prevent the condensate from staying at the condensate outlet 14.

[0034] The particle size of nano-micro adsorbents is usually at the nanometer or micrometer level, so they have extremely high specific surface area and adsorption capacity, are resistant to high temperatures, have stable structures, and can be repeatedly regenerated and recycled, with a service life of more than 3 years.

[0035] The adsorption device of the utility model has the advantages of simple structure, low operating cost, simple operation, low energy consumption, low operating resistance, high desulfurization efficiency, and the SO2 concentration after combustion is lower than 20mg / Nm 3 , no by-products are produced, it is highly environmentally friendly, highly safe and reliable, and can effectively neutralize the sulfides in coal gas, thereby reducing direct emissions of coal gas into nature.

Claims

1. A carbonyl sulfide adsorption device for blast furnace gas, characterized in that: The invention comprises an adsorption tower, which is provided with an adsorption tower inlet, an adsorption tower outlet and a condensed water outlet; the adsorption tower inlet of the adsorption tower is connected with an inlet pipe, on which a first sulfur measuring device, a first butterfly valve, a first blind plate valve, a first pressure detecting device and a first temperature detecting device are sequentially arranged; the adsorption tower outlet of the adsorption tower is connected with an outlet pipe, on which a second blind plate valve, a second butterfly valve, a second pressure detecting device, a second temperature detecting device and a second sulfur measuring device are sequentially arranged; and the condensed water outlet of the adsorption tower is provided with a gate valve.

2. The carbonyl sulfide adsorption device for blast furnace gas according to claim 1, characterized in that: The adsorption tower includes a skirt, a cylinder is arranged on the skirt, the inlet of the adsorption tower is arranged on the side wall of the cylinder, a supporting grid is arranged in the cylinder, an adsorbent filler is arranged on the supporting grid, a feed hole and a discharge hole are arranged in the side wall of the cylinder above the supporting grid, the feed hole is located above the discharge hole, the adsorption tower outlet is arranged at the top of the cylinder, and the condensate discharge port is arranged at the bottom of the cylinder.

3. The carbonyl sulfide adsorption device for blast furnace gas according to claim 2, characterized in that: An elliptical seal head is arranged at the upper end of the cylinder, and a lifting lug is arranged on the outer wall of the elliptical seal head.

4. The carbonyl sulfide adsorption device for blast furnace gas according to claim 2, characterized in that: An anti-vortex device is provided on the condensate discharge port.

5. The carbonyl sulfide adsorption device for blast furnace gas according to claim 2, characterized in that: The bottom of the skirt is connected with an electrostatic grounding plate.

6. The carbonyl sulfide adsorption device for blast furnace gas according to claim 2, characterized in that: A filler support is arranged between the lower side of the support grid and the cylinder.

7. The carbonyl sulfide adsorption device for blast furnace gas according to claim 2, characterized in that: The adsorbent is a nano-micro adsorbent.

8. The carbonyl sulfide adsorption device for blast furnace gas according to claim 1, characterized in that: The first butterfly valve and the second butterfly valve are both manual butterfly valves, the first blind plate valve and the second blind plate valve are both manual blind plate valves, and the gate valve is a manual gate valve.

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