CN211753951U - Purification system for waste gas containing high-concentration reductive sulfide in sewage station - Google Patents
Purification system for waste gas containing high-concentration reductive sulfide in sewage station Download PDFInfo
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- CN211753951U CN211753951U CN202020426028.2U CN202020426028U CN211753951U CN 211753951 U CN211753951 U CN 211753951U CN 202020426028 U CN202020426028 U CN 202020426028U CN 211753951 U CN211753951 U CN 211753951U
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Abstract
The utility model relates to a sewage station contains clean system of high concentration reductive sulfide waste gas belongs to environmental protection technical field. Sewage station contain clean system of high concentration reducing sulfide waste gas, including the edulcoration jar, the edulcoration jar links to each other with one-level absorption tower, second grade absorption tower, gas-liquid separation jar, centrifugal fan in proper order, one-level absorption tower and second grade absorption tower link to each other with the absorption liquid storage tank through adding the medicine pump respectively. The purification process of the utility model has scientific and reasonable design, simplicity, convenience, high treatment efficiency, no secondary pollution, energy conservation and environmental protection; the utility model discloses provide a clean system that the design is simple simultaneously.
Description
Technical Field
The utility model relates to a sewage station contains clean system of high concentration reductive sulfide waste gas belongs to environmental protection technical field.
Background
The existing sewage station high-concentration hydrogen sulfide waste gas adopts a chemical absorption method (alkali liquor absorption), but the following problems are mainly existed:
(1) alkali liquor reacts with hydrogen sulfide to generate salt, and salt crystallization can be generated when the concentration is high, so that tower, pipeline and circulating pump are blocked;
(2) the high-salinity absorption liquid is periodically returned and discharged into a sewage station for treatment, so that secondary pollution is caused, and the treatment load of the sewage station is increased;
(3) after the sulfur-containing high-salt wastewater enters a sewage station, hydrogen sulfide is generated under the action of microorganisms, and part of the hydrogen sulfide is emitted in a gas mode and needs to be subjected to secondary absorption treatment;
(4) the method of absorbing hydrogen sulfide by alkali liquor has large fluctuation of the absorption effect of hydrogen sulfide. Along with the absorption process, the concentration of the alkali liquor is continuously reduced, the treatment effect is rapidly reduced, the alkali liquor is not completely utilized, and the waste of the alkali liquor is caused.
The related main process flow is as follows:
after being collected, the waste gas containing hydrogen sulfide in the sewage station enters a two-stage packed tower, and is sprayed and absorbed by alkali liquor, the pH value of the alkali liquor is controlled to be more than 10.0, and the gas-liquid contact mode is countercurrent contact. And (4) circularly spraying, wherein the circularly spraying liquid reaches a certain concentration and is discharged to a sewage treatment station for treatment. The discharge frequency is designed according to the concentration received by the sewage station. The wastewater is discharged with high salt content.
The main reactions involved are as follows:
NaOH+H2S＝NaSH+H2O，NaOH+NaSH＝Na2S+H2O。
in summary, the existing processing methods have many disadvantages, and a new processing system needs to be developed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sewage station contains clean system of high concentration reductive sulfide waste gas, its design scientific and reasonable, and is simple convenient, and the treatment effeciency is high, no secondary pollution, energy-concerving and environment-protective.
Sewage station contain clean system of high concentration reducing sulfide waste gas, including the edulcoration jar, the edulcoration jar links to each other with one-level absorption tower, second grade absorption tower, gas-liquid separation jar, centrifugal fan in proper order, one-level absorption tower and second grade absorption tower link to each other with the absorption liquid storage tank through adding the medicine pump respectively.
Preferably, the bottom of the impurity removal tank is connected with the impurity storage tank.
Preferably, the bottom of the first-stage absorption tower is connected with the first-stage absorption liquid regeneration reactor, and the bottom of the second-stage absorption tower is connected with the second-stage absorption liquid regeneration reactor, so that the regenerated absorption liquid is recycled, and energy conservation and consumption reduction are realized.
Preferably, the bottom of the gas-liquid separation tank is connected with the secondary absorption tower, so that the complex iron compound medicament is recycled.
The gas inlet mode of the gas-liquid separation tank adopts upper gas inlet and upper gas outlet. Liquid drops are removed from the gas through the inertia collision and interception and filtration effects of the internal gas-liquid separation layer, and the liquid drops can be conveyed to the inside of the secondary absorption tower for recycling.
When the purification system of the waste gas containing the high-concentration reducing sulfide in the sewage station is used, the purification system comprises the following steps:
(a) starting a centrifugal fan, removing impurities from the collected waste gas, introducing the waste gas after impurity removal into a primary absorption tower, and periodically guiding and discharging impurities generated by impurity removal to an impurity storage tank;
(b) the first-stage absorption tower purifies the waste gas by adopting a gas-liquid countercurrent contact mode, the adopted absorption liquid is a complexing iron compound agent, and the absorption liquid enters an absorption liquid regeneration reactor for regeneration after absorption;
(c) the waste gas enters a secondary absorption tower, and the absorption liquid is continuously sprayed for purification;
(d) and the waste gas is separated by a gas-liquid separation tank, the separated gas is discharged after reaching the standard, and the separated liquid is collected and reprocessed.
When the waste gas is purified in the first-stage absorption tower, the contact time of the absorption liquid and the waste gas is 6-10s, and the air velocity of the empty tower is 0.6-0.9 m/s.
When the waste gas is purified in the first-stage absorption tower, the absorption layer is sprayed in three layers, and the height of each layer is 1.4-1.6 m.
When the waste gas is purified in the secondary absorption tower, the contact time of the absorption liquid and the waste gas is 3-5s, and the air velocity of the empty tower is 0.9-1.2 m/s.
When the waste gas is purified in the secondary absorption tower, the absorption layer is sprayed in two layers, and the height of each layer is 1.0-1.2 m.
The complex iron compound agent is a mixture of a complex iron catalyst, a sulfur flocculating agent and a sulfur stabilizing agent. The mixing mass ratio is preferably 100: 0.5: 0.1 to 100: 0.5: 0.2. the complex iron compound medicament can accelerate the formation speed of sulfur particles and the stability of sulfur while absorbing hydrogen sulfide gas.
The mass concentration of iron ions in the complex iron compound reagent in the first-stage absorption tower is as follows: 2.0 to 3.0 percent; the mass concentration of iron ions in the complex iron compound agent in the secondary absorption tower is as follows: 0.5 to 0.7 percent.
In the sewage treatment process, the water tank of the anaerobic section or the hydrolysis acidification section can generate hydrogen sulfide gas under the action of microorganisms. The concentration of hydrogen sulfide is higher, generally more than 300-500PPM, even more than ten thousand PPM. Process in, start centrifugal fan and dosing pump, with waste gas earlier through the edulcoration jar, get rid of foam, the liquid drop of dying mud, big particle diameter smuggleing secretly in with waste gas. The removed foam, dead mud and liquid drops are collected at the bottom of the impurity removal tank and are drained by flow guide at regular intervals. The main purpose of this step is: impurities in the waste gas are removed, and the stability of the subsequent absorption liquid can be effectively ensured. And (3) introducing the waste gas subjected to impurity removal into a primary absorption tower, adopting a gas-liquid countercurrent contact mode, spraying the absorption liquid from the top of the tower through a dosing pump, flowing to the bottom, and discharging the absorption liquid to a primary absorption liquid regeneration reactor through a discharge pipe. The absorption liquid can be pumped into the first-stage absorption tower through a pump after being regenerated, and is circularly sprayed. After the first-stage absorption, the absorption efficiency can reach 90-95%. And the waste gas after the primary absorption enters a secondary absorption tower, and the absorption liquid is sprayed from the top of the tower through a dosing pump, flows to the bottom and is discharged to a secondary absorption liquid regeneration reactor through a discharge pipe. The absorption liquid can be pumped into a secondary absorption tower through a pump after being regenerated, and is circularly sprayed. After the second-stage absorption, the absorption efficiency can reach 80-90%. The gas after secondary absorption passes through a gas-liquid separation tank, and the absorption liquid carried by the entrainment is separated and recovered, so that the loss of the absorption liquid is reduced; the separated gas reaches the standard and is discharged. The temperature of the complex iron compound medicament is set to be 40-50 ℃, and the pressure is set to be normal pressure.
The centrifugal fan is arranged at the tail end of the system, a negative pressure state is provided for the whole system, leakage of gas through a pipeline interface is effectively avoided, and meanwhile corrosion to the centrifugal fan is greatly reduced by the treated gas.
The regeneration gas required by the absorption liquid regeneration reactor can be supplied through a branch pipeline of a roots blower arranged in the sewage station; and the absorption liquid in the absorption liquid regeneration reactor is automatically discharged into a plate-and-frame filter press at regular intervals, and the generated sulfur is filter-pressed. The filter pressing liquid returns to the first-stage absorption tower and the second-stage absorption tower respectively for use.
The process specifically adopts a combined process, namely a mode of pretreatment, first-stage high-concentration complexing absorption, first-stage low-concentration complexing absorption and gas-liquid separation. The process is not to directly change the absorption liquid from the alkali liquor to the complex iron compound reagent and directly move the sulfur recovery technology, but combines the characteristics of the waste gas of the sewage station, and develops an environment-friendly purification process suitable for generating high-concentration hydrogen sulfide in the sewage station through the design and combination of an environment-friendly process and equipment, and the process development is based on the purposes of high efficiency, no secondary pollution, investment reduction and operation cost reduction.
Compared with the prior art, the utility model, following beneficial effect has:
(1) the utility model adopts a two-stage absorption mode, reduces the loss of iron ions in the catalyst, reduces the supplement amount and saves the operation cost;
(2) the utility model has the advantages of scientific and reasonable design, it is simple convenient, the treatment effeciency is high, no secondary pollution, energy-concerving and environment-protective.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
in the figure: 1. reducing sulfide waste gas; 2. an absorption liquid storage tank; 3. a dosing pump; 4. a first-stage absorption tower; 5. a secondary absorption tower; 6. a gas-liquid separation tank; 7. a centrifugal fan; 8. a secondary absorption liquid regeneration reactor; 9. a first-stage absorption liquid regeneration reactor; 10. an impurity storage tank; 11. and (5) an impurity removal tank.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments, but the present invention is not limited to these embodiments.
Example 1
As shown in figure 1, the purification system for waste gas containing high-concentration reductive sulfide in the sewage station comprises an impurity removal tank 11, wherein the impurity removal tank 11 is sequentially connected with a primary absorption tower 4, a secondary absorption tower 5, a gas-liquid separation tank 6 and a centrifugal fan 7, and the primary absorption tower 4 and the secondary absorption tower 5 are respectively connected with an absorption liquid storage tank 2 through a dosing pump 3.
When the purification system of the waste gas containing the high-concentration reducing sulfide in the sewage station is used, the purification system comprises the following steps:
(a) starting a centrifugal fan 7, removing impurities from the collected waste gas, introducing the waste gas after impurity removal into a primary absorption tower 4, and periodically guiding and discharging impurities generated by impurity removal to an impurity storage tank 10;
(b) the primary absorption tower 4 purifies the waste gas by adopting a gas-liquid countercurrent contact mode, the adopted absorption liquid is a complex iron compound reagent, the mass concentration of iron ions is 2.0 percent, and the absorption liquid enters a primary absorption liquid regeneration reactor 9 for regeneration after absorption;
(c) the waste gas enters a secondary absorption tower 5, the adopted absorption liquid is a complexing iron compound agent, the mass concentration of iron ions is 0.5%, the absorption liquid is continuously sprayed for purification, and the absorption liquid enters a secondary absorption liquid regeneration reactor 8 for regeneration after absorption;
(d) the waste gas is separated by the gas-liquid separation tank 6, the separated gas is discharged after reaching the standard, and the separated liquid is collected and reprocessed.
When the waste gas is purified in the first-stage absorption tower 4, the contact time of the absorption liquid and the waste gas is 8s, and the air velocity of the empty tower is 0.8 m/s.
When the waste gas is purified in the first-stage absorption tower 4, the absorption layer is sprayed in three layers, and the height of each layer is 1.5 m.
When the waste gas is purified in the secondary absorption tower 5, the contact time of the absorption liquid and the waste gas is 4s, and the air velocity of the empty tower is 1.0 m/s.
When the waste gas is purified in the secondary absorption tower 5, the absorption layer is sprayed in two layers, and the height of each layer is 1.1 m.
The complex iron compound agent is a mixture of a complex iron catalyst, a sulfur flocculating agent and a sulfur stabilizing agent. The mixing mass ratio is preferably 100: 0.5: 0.1.
example 2
The structure is the same as in example 1, except that:
the bottom of the impurity removal tank 11 is connected with the impurity storage tank 10.
The bottom of the first-stage absorption tower 4 is connected with the first-stage absorption liquid regeneration reactor 9, and the bottom of the second-stage absorption tower 5 is connected with the second-stage absorption liquid regeneration reactor 8, so that the regenerated absorption liquid is recycled, and energy conservation and consumption reduction are realized.
The bottom of the gas-liquid separation tank 6 is connected with the secondary absorption tower 5.
Waste gas of a certain pharmaceutical sewage tank (hydrolysis acidification tank), gas amount: 3500N m3H, odor-reducing sulfide concentration: 500mg/m3。
The first-stage absorption tower is arranged: Φ 1.05 × 3.20m, material SUS316, absorption circulation pump disposed: 30m3/h, 25m lift; the second-stage absorption tower is arranged: Φ 1.2 × 3.50m, material SUS316, absorption circulation pump disposed: 30m3/h, 25m lift; a gas-liquid separation tank: Φ 0.8 × 2.00 m.
Designing a primary absorption liquid regeneration reactor: 1.3m 1.00m, sulfur pump design: 6m3H, 15m lift; a regenerative fan: q is 500m3H, 8000 Pa; designing a primary absorption liquid regeneration reactor: 1.3m 1.00m, sulfur pump design: 5m3H, 15m lift; a regenerative fan: q is 400m3/h，H＝6000Pa。
And starting the centrifugal fan 7 and the dosing pump 3, passing the waste gas through an impurity removal tank 11 (phi 0.8 x 2.5m), and removing foams, dead mud and liquid drops with large particle size from the waste gas. The removed foam, dead mud and liquid drops are collected at the bottom of the impurity removing tank 11 and are drained by flow guide at regular intervals. The main purpose of this step is: impurities in the waste gas are removed, and the stability of the subsequent absorption liquid can be effectively ensured. The waste gas after impurity removal enters a primary absorption tower 4, and the absorption liquid is sprayed from the top of the tower through a dosing pump 3 and flows down to the bottom by adopting a gas-liquid countercurrent contact type, and then is discharged to a primary absorption liquid regeneration reactor 9 through a discharge pipe. The absorption liquid can be pumped into the first-stage absorption tower 4 through a pump after being regenerated, and is circularly sprayed. After the first-stage absorption, the concentration of the hydrogen sulfide is 40-45mg/m3And the waste gas after primary absorption enters a secondary absorption tower 5, and the absorption liquid is sprayed from the top of the tower through a dosing pump 3 and flows down to the bottom of the tower, and then is discharged to a secondary absorption liquid regeneration reactor 8 through a discharge pipe. The absorption liquid can be pumped into a secondary absorption tower 5 through a pump after being regenerated, and is circularly sprayed. After the secondary absorption, the concentration of the hydrogen sulfide is 3-5mg/m3. The gas after the secondary absorption passes through the gas-liquid separation tank 6, and the absorption liquid carried by the entrainment is separated and recovered, so that the loss of the absorption liquid is reduced; the content of hydrogen sulfide in the separated gas is 3-5mg/m3Can reach the discharge standard.
The absorption liquid in the first-stage absorption liquid regeneration reactor 9 and the second-stage absorption liquid regeneration reactor 8 is automatically discharged into a plate-and-frame filter press at regular intervals, and the generated sulfur is filter-pressed. The filter pressing liquid returns to the first-stage absorption tower 4 and the second-stage absorption tower 5 respectively for use.
Claims (4)
1. A sewage station contains clean system of high concentration reducing sulfide waste gas which characterized in that: the device comprises an impurity removal tank (11), wherein the impurity removal tank (11) is sequentially connected with a primary absorption tower (4), a secondary absorption tower (5), a gas-liquid separation tank (6) and a centrifugal fan (7), and the primary absorption tower (4) and the secondary absorption tower (5) are respectively connected with an absorption liquid storage tank (2) through a dosing pump (3).
2. The purification system for the high concentration reductive sulfide containing waste gas from the sewage station as recited in claim 1, wherein: the bottom of the impurity removal tank (11) is connected with an impurity storage tank (10).
3. The purification system for the high concentration reductive sulfide containing waste gas from the sewage station as recited in claim 1, wherein: the bottom of the first-stage absorption tower (4) is connected with a first-stage absorption liquid regeneration reactor (9), and the bottom of the second-stage absorption tower (5) is connected with a second-stage absorption liquid regeneration reactor (8).
4. The purification system for the high concentration reductive sulfide containing waste gas from the sewage station as recited in claim 1, wherein: the bottom of the gas-liquid separation tank (6) is connected with the secondary absorption tower (5).
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| CN202020426028.2U CN211753951U (en) | 2020-03-27 | 2020-03-27 | Purification system for waste gas containing high-concentration reductive sulfide in sewage station |
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| CN202020426028.2U CN211753951U (en) | 2020-03-27 | 2020-03-27 | Purification system for waste gas containing high-concentration reductive sulfide in sewage station |
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Address after: 6 / F, building 7, Zhangjiang Industrial Park, economic development zone, Zibo City, Shandong Province 255300 Patentee after: Shuimu Qingyan ecological environmental protection (Shandong) Co.,Ltd. Address before: 6 / F, building 7, Zhangjiang Industrial Park, economic development zone, Zibo City, Shandong Province 255300 Patentee before: Shandong pailidi Environmental Technology Co.,Ltd. |
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