CN210786824U - Double-tower double-circulation wet desulphurization device with series-parallel flue - Google Patents
Double-tower double-circulation wet desulphurization device with series-parallel flue Download PDFInfo
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Abstract
A double-tower double-circulation wet desulphurization device with series-parallel flues belongs to the technical field of wet desulphurization of sintering flue gas in the steel industry. The device comprises an original flue gas flue, a first-stage desulfurizing tower, a series flue, a bypass flue, a regulating valve, a second-stage desulfurizing tower, a porous tray, a multi-stage spraying layer, a single-stage ridge type demister, a tube bundle type dust remover and a clean flue gas flue, iThe stage desulfurizing tower and the second-stage desulfurizing tower are connected in parallel through a bypass flue, a butterfly valve is arranged on an original flue gas flue, a regulating valve is arranged on the bypass flue, and a porous tray, a multi-stage spraying layer, a single-stage ridge type demister and a tube bundle type dust remover are arranged inside the second-stage desulfurizing tower from bottom to top. Has the advantages that the flue gas is divided by arranging the bypass flue and the regulating valve, thereby solving the problems of large flue gas amount and SO at the original flue gas inlet of the sintering2When the concentration is high, the flow velocity of flue gas in the first-stage desulfurizing tower is high, and the content of fog drops and dust in outlet flue gas slurry is high, so that the problems of blockage of operation equipment of the second-stage desulfurizing tower and reduction of desulfurizing efficiency are caused.
Description
Technical Field
The utility model belongs to the technical field of steel industry sintering flue gas wet flue gas desulfurization, in particular to join in marriage two tower dual cycle wet flue gas desulphurization unit of taking the series-parallel flue.
Background
The wet desulphurization process has the advantages of high desulphurization efficiency (more than or equal to 95 percent), good stability, low operation cost and the like, is widely applied to the desulphurization treatment of ultralow emission of sintering flue gas in the domestic iron and steel industry, and occupies a dominant position. At present, the domestic wet desulphurization process mainly adopts single-tower desulphurization and adopts limestone-gypsum slurry as an absorbent. The sintering flue gas in the iron and steel industry has large volume and SO2Strong concentration fluctuation, low temperature and the like, and is easy to generate large amount of SO and high sulfur coal when a large sintering unit runs at full load or adopts high sulfur coal as fuel2The sintering flue gas with high concentration is difficult to meet the desulfurization requirement of the original sintering flue gas by a single desulfurization tower, and the problems that the empty tower operation air speed of a first-stage desulfurization tower is too high (more than or equal to 5m/s), the retention time of the sintering flue gas in the tower is too short, the sintering flue gas cannot be fully contacted with limestone-gypsum spraying slurry, the desulfurization efficiency is influenced and the like exist in the conventional series double-tower wet desulfurization operation mode of one desulfurization tower are increased; simultaneously because one-level desulfurizing tower export flue gas smoke velocity is too high, carries a large amount of thick liquid drops that spray, leads to one-level desulfurizing tower export dust concentration to be higher than one-level desulfurizing tower entry dust concentration even, and then seriously blocks up the normal operating of follow-up second grade desulfurizing tower equipment, and increase second grade desulfurizing tower equipment washes the water consumption, influences the PH that second grade desulfurizing tower sprayed the thick liquid, reduces the lime stone utilization ratio, influences desulfurization efficiency.
Disclosure of Invention
The utility model disclosesAims to provide a double-tower double-circulation wet desulphurization device with series-parallel flue, which solves the problems of large flue gas volume at a sintering flue gas inlet and SO2When the concentration is too high, the empty tower operation wind speed of the primary desulfurization tower is too high, the carrying problem of the outlet flue gas slurry is serious, and the problem of blockage of the follow-up secondary desulfurization tower operation equipment is easily caused.
A double-tower double-circulation wet desulphurization device with series-parallel flues comprises a butterfly valve 2, a raw flue gas flue 3, a first-stage desulphurization tower 4, a series flue 7, a bypass flue 8, a regulating valve 9, a second-stage desulphurization tower 10, a porous tray 11, a multi-stage spray layer 12, a single-stage ridge demister 13, a tube bundle type dust remover 14 and a clean flue 15, wherein the raw flue gas flue 3 is connected with the inlet end of the first-stage desulphurization tower 4, the outlet end of the first-stage desulphurization tower 4 is connected with the inlet end of the second-stage desulphurization tower 10 through the series flue 7, the outlet end of the second-stage desulphurization tower 10 is connected with a chimney 16 through the clean flue 15, the first-stage desulphurization tower 4 and the second-stage desulphurization tower 10 are connected in parallel through the bypass flue 8, the inlet end of the bypass flue 8 is connected with the raw flue 3, the outlet end of the bypass flue 8 is connected with the series flue 7, the raw flue 3 is provided with the butterfly valve, porous tray 11, multistage spraying layer 12, single-stage ridge defroster 13 and tube bundle dust remover 14 set up in the inside of second grade desulfurizing tower 10, and porous tray 11 is located the entry end top of second grade desulfurizing tower 10, sprays the top that layer 12 is located porous tray 11, and single-stage ridge defroster 13 is located the top of spraying layer 12, and tube bundle dust remover 14 is located between the exit end of single-stage ridge defroster 13 and second grade desulfurizing tower 10.
The porous tray 11 is made of 2205 duplex stainless steel, the aperture ratio is 30-40%, the tray resistance is 300-400 Pa, and when sintering raw flue gas passes through the porous tray 11, the porous tray plays a role in reducing the flow rate of the sintering raw flue gas, prolonging the reaction time of the sintering raw flue gas in the secondary desulfurization tower 10, blocking the carrying amount of flue gas slurry and dust-containing fog drops, and improving the desulfurization efficiency.
The single-stage ridge type demister 13 is made of a PP material, has a large demisting area, is convenient to wash and improves the flue gas dehydration efficiency.
The multi-stage spray layer 12 is composed of four spray layers, and each spray layer is limestone-gypsum slurry.
The using method of the desulfurization device comprises the following specific steps and parameters:
1. when the raw flue gas is sintered into an SO inlet2Concentration is less than or equal to 834mg/Nm3When the process is carried out, the secondary desulfurization tower 10 is operated independently, the main induced draft fan 1 is started, the butterfly valve 2 is closed, the regulating valve 9 is opened, and the sintering raw flue gas is introduced into the secondary desulfurization tower 10 through the bypass flue 8; when the raw flue gas is sintered into an SO inlet2The concentration is 834mg/Nm3＜CSO2≤3500mg/Nm3During the process, the primary desulfurization tower 4 and the secondary desulfurization tower 10 are operated simultaneously, the empty tower wind speed of the primary desulfurization tower 4 is reduced to 3.5m/s, the main induced draft fan 1 is started, the butterfly valve 2 and the regulating valve 9 are opened, the sintering original flue gas with the volume of 10% -30% is introduced into the secondary desulfurization tower 10 through the bypass flue 8, and the sintering original flue gas with the volume of 70% -90% is introduced into the primary desulfurization tower 4 through the original flue gas 3 to complete primary desulfurization.
2. The original sintering flue gas reversely flows from bottom to top in the secondary desulfurization tower 10 and flows through the porous trays 11 firstly, and the surfaces of the porous trays 11 have liquid accumulation layers with certain thicknesses under the spraying action in the tower, so that the smoke content and the slurry carrying capacity in the original sintering flue gas are effectively intercepted when the original sintering flue gas passes through the liquid accumulation layers, the rectification flue gas distribution is facilitated, the flow speed of the original sintering flue gas is reduced to 3.2-3.5 m/s, the reaction time of the original sintering flue gas in the secondary desulfurization tower 10 is prolonged, and the desulfurization effect is improved.
3. The sintering raw flue gas passes through the porous tray 11 and then continuously flows upwards through the multi-stage spraying layer 12, the pH value of limestone-gypsum slurry is controlled within the range of 5.0-6.0, and SO in the sintering raw flue gas2And Ca (OH) in the multi-stage spray layer 122The secondary desulfurization tower 10 is fully contacted to complete the desulfurization process, the desulfurization efficiency is more than or equal to 96.4 percent, and SO of the flue gas at the outlet of the secondary desulfurization tower 102The concentration is less than or equal to 30mg/m3。
4. The sintering raw flue gas passing through the multi-stage spraying layer 12 is saturated wet flue gas, the saturated wet flue gas continuously flows upwards in the secondary desulfurization tower 10, the saturated wet flue gas passes through the single-stage ridge type demister 13 to remove entrainment of fog drop slurry in the saturated wet flue gas, and the single-stage spray tower is single-stage spray towerThe water content in the flue gas at the outlet of the ridge-type demister 13 is less than or equal to 75mg/Nm3。
5. The desulfurized and demisted sintering clean flue gas continuously flows upwards in the secondary desulfurization tower 10 and enters the tube bundle type dust remover 14, the tube bundle type dust remover 14 is used for removing dust particles and slurry liquid drops in the sintering clean flue gas, and the dust concentration at the outlet of the tube bundle type dust remover 14 is ensured to be less than or equal to 35mg/Nm3。
6. The sintering clean flue gas after the double-tower double-circulation wet desulphurization process reaches the ultralow emission standard of desulphurization flue gas treatment, enters the chimney 16 along the clean flue gas flue 15 and is discharged at high altitude, and the flue gas treatment is completed.
The utility model has the advantages that:
1. compared with the traditional series double-tower wet desulphurization device, the parallel bypass flue is arranged between the first and second desulphurization towers, the sintering original flue gas bypasses the first-stage desulphurization tower according to the opening of the regulating valve, and directly enters the second-stage desulphurization tower, so that the problem that the air speed of the empty tower of the first-stage desulphurization tower is too high (more than or equal to 5m/s) when the sintering flue gas volume is too large, the dust content of the flue gas at the outlet of the desulphurization tower is higher than that of the smoke at the inlet, the flue gas slurry is serious in entrainment problem, and the desulphurization efficiency is reduced is solved.
2. A porous tray is arranged above a flue inlet of the secondary desulfurization tower, continuous accumulated liquid is formed on the surface of the tray by means of multi-stage spraying action in the tower, and the sintering raw flue gas passes through the accumulated liquid layer of the tray, so that the effects of uniformly distributing a flue gas flow field, reducing the flow rate of the flue gas, prolonging the retention time in the flue gas tower and improving the desulfurization efficiency are achieved; simultaneously, the method is favorable for catching slurry liquid drops carried by flue gas at the outlet of the primary desulfurization tower, and reduces the blocking probability of a demister and a tube bundle type dust remover in the secondary desulfurization tower.
3. Compared with the traditional flat plate type demister, the single-stage ridge type demister is arranged above the spraying layer of the secondary desulfurization tower, the demisting area is larger under the same inner cross section of the tower, and the demisting efficiency is higher; simultaneously, the ridge type demister washing system is more optimized, and the washing water consumption is lower than that of a flat plate type demister.
4. The tube bundle type dust remover is arranged below the outlet flue at the top of the secondary desulfurization tower, has the dust removal efficiency higher than or equal to 90 percent and is used for transportingThe traveling resistance is less than or equal to 600Pa, the economy is excellent, and the like, can effectively remove fog drops and dust particles in saturated clean flue gas, eliminate gypsum rain phenomenon and ensure that the dust concentration at a sintering flue gas outlet is less than or equal to 35mg/Nm3。
5. A certain amount of original flue gas is shunted through a bypass flue under the working condition of large-amount sintering flue gas, the pH value of limestone-gypsum slurry of a primary desulfurization tower is favorably reduced and controlled within the range of 5.0-6.0, the solubility and the utilization rate of limestone in the slurry are favorably improved under a weak acid environment, equipment scaling in the tower is relieved, and the operation cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of the device. The system comprises a main induced draft fan 1, a butterfly valve 2, a raw flue gas flue 3, a first-stage desulfurizing tower 4, a spraying layer 5, a flat plate type demister 6, a series flue 7, a bypass flue 8, a regulating valve 9, a second-stage desulfurizing tower 10, a porous tray 11, a multi-stage spraying layer 12, a single-stage ridge type demister 13, a tube bundle type dust remover 14, a clean flue gas flue 15 and a chimney 16.
Detailed Description
A double-tower double-circulation wet desulphurization device with series-parallel flues comprises a butterfly valve 2, a raw flue gas flue 3, a first-stage desulphurization tower 4, a series flue 7, a bypass flue 8, a regulating valve 9, a second-stage desulphurization tower 10, a porous tray 11, a multi-stage spraying layer 12, a single-stage ridge demister 13, a tube bundle type dust remover 14 and a clean flue gas flue 15, wherein the raw flue gas flue 3 is connected with the inlet end of the first-stage desulphurization tower 4, the outlet end of the first-stage desulphurization tower 4 is connected with the inlet end of the second-stage desulphurization tower 10 through the series flue 7, and the outlet end of the second-stage desulphurization tower 10 is connected with a chimney 16 through the clean flue gas flue 15; one-level desulfurizing tower 4 passes through bypass flue 8 parallel connection with second grade desulfurizing tower 10, bypass flue 8's entrance point is connected with former flue gas flue 3, bypass flue 8's exit end is connected with series connection flue 7, be equipped with butterfly valve 2 on the former flue gas flue 3, be equipped with governing valve 9 on the bypass flue 8, porous tray 11, multistage spraying layer 12, single-stage roof ridge formula defroster 13 and tube bundle formula dust remover 14 set up the inside at second grade desulfurizing tower 10, porous tray 11 is located the entry end top of second grade desulfurizing tower 10, spraying layer 12 is located the top of porous tray 11, single-stage roof ridge formula defroster 13 is located the top that sprays layer 12, tube bundle formula dust remover 14 is located between the exit end of single-stage roof ridge formula defroster 13 and second grade desulfurizing tower 10. The porous tray 11 is made of 2205 duplex stainless steel, the aperture ratio is 30-40%, and the tray resistance is 340 Pa; the single-stage ridge type demister 13 is made of PP material; the multi-stage spray layer 12 is composed of four spray layers, each spray layer being limestone-gypsum slurry.
The method of using the desulfurization device is shown in example 1 and example 2.
Example 1
A use method of a double-tower double-circulation wet desulphurization device with series-parallel flues comprises the following specific steps and parameters:
1. raw sintering flue gas inlet SO2The concentration is 798mg/Nm3Independently operating the secondary desulfurizing tower 10, starting the main induced draft fan 1, closing the butterfly valve 2 and opening the regulating valve 9 to adjust the dust content to 178mg/Nm3The raw sintering flue gas is introduced into a secondary desulfurization tower 10 through a bypass flue 8.
2. The original sintering flue gas reversely flows from bottom to top in the secondary desulfurization tower 10 and firstly passes through the porous tray 11, and the surface of the porous tray 11 has a liquid accumulation layer with a certain thickness under the spraying action in the tower, so that the smoke content and the slurry carrying capacity in the original sintering flue gas are effectively intercepted when the original sintering flue gas passes through the liquid accumulation layer, the rectification flue gas distribution is facilitated, the flow speed of the original sintering flue gas is reduced to 3.2m/s, the reaction time of the original sintering flue gas in the secondary desulfurization tower 10 is prolonged, and the desulfurization effect is improved.
3. The sintering raw flue gas passes through the porous tray 11 and then continuously flows upwards through the multi-stage spraying layer 12, the pH value of limestone-gypsum slurry is controlled within the range of 5.5-6.0, and SO in the sintering raw flue gas2And Ca (OH) in the multi-stage spray layer 122The full contact in the secondary desulfurizing tower 10 completes the desulfurizing process, the desulfurizing efficiency is 97.2 percent, and the SO of the flue gas at the outlet of the secondary desulfurizing tower 102The outlet concentration is 22.3mg/m3。
4. The sintering raw flue gas passing through the multi-stage spraying layer 12 is saturated wet flue gas, the saturated wet flue gas continuously flows upwards in the secondary desulfurization tower 10, and the saturated wet flue gas is removed after flowing through the single-stage ridge type demister 13The entrainment of the slurry of the fog drops in the saturated wet flue gas, the water content in the flue gas at the outlet of the single-stage ridge type demister 13 is 68.8mg/Nm3。
5. The desulfurized and demisted sintering clean flue gas continuously flows upwards in the secondary desulfurization tower 10 and enters the tube bundle type dust remover 14, the tube bundle type dust remover 14 is used for removing dust particles and slurry liquid drops in the sintering clean flue gas, and the dust concentration at the outlet of the tube bundle type dust remover 14 is 29.9mg/Nm3。
6. The sintering clean flue gas after the double-tower double-circulation wet desulphurization process reaches the ultralow emission standard of desulphurization flue gas treatment, enters the chimney 16 along the clean flue gas flue 15 and is discharged at high altitude, and the flue gas treatment is completed.
Example 2
A use method of a double-tower double-circulation wet desulphurization device with series-parallel flues comprises the following specific steps and parameters:
1. when the raw flue gas is sintered into an SO inlet2The concentration was 3346mg/Nm3Dust concentration of 192mg/Nm3When the total volume of the original sintering flue gas is large, the primary desulfurizing tower 4 and the secondary desulfurizing tower 10 are operated simultaneously, the air speed of the empty tower of the primary desulfurizing tower 4 is reduced to 3.5m/s, the main induced draft fan 1 is started, the butterfly valve 2 and the regulating valve 9 are opened, the original sintering flue gas with the volume of 20% is introduced into the secondary desulfurizing tower 10 through the bypass flue 8, and the original sintering flue gas with the volume of 80% is introduced into the primary desulfurizing tower 4 through the original flue gas flue 3 to complete primary desulfurization.
2. SO of flue gas at outlet of primary desulfurizing tower 42The smoke concentration is 120mg/Nm3Through the serial flue 7 and the bypass flue 8 and the SO2The concentration was 3346mg/Nm3The raw sintering flue gas is mixed and then introduced into a secondary desulfurization tower 10, and flows in the desulfurization tower 10 from bottom to top in a reverse direction. Firstly, the flue gas passes through the porous tray 11, and the surface of the porous tray 11 has a liquid accumulation layer with a certain thickness under the spraying action in the tower, so that the smoke content and the slurry carrying capacity in the sintering raw flue gas are effectively intercepted when the sintering raw flue gas passes through the liquid accumulation layer, the rectification flue gas distribution is facilitated, the flow speed of the sintering raw flue gas is reduced to 3.4m/s, the reaction time of the sintering raw flue gas in the secondary desulfurization tower 10 is prolonged, and the desulfurization effect is improved.
3. The sintering raw flue gas passes through the porous tray 11 and then continuously flows upwards through the multi-stage spraying layer 12, the pH value of limestone-gypsum slurry is controlled within the range of 5.0-6.0, and SO in the sintering raw flue gas2And Ca (OH) in the multi-stage spray layer 122The full contact in the secondary desulfurizing tower 10 completes the desulfurizing process, the desulfurizing efficiency is 96.8 percent, and the SO of the flue gas at the outlet of the secondary desulfurizing tower 102The outlet concentration is 24.48mg/m3。
4. The sintering raw flue gas passing through the multi-stage spraying layer 12 is saturated wet flue gas, the saturated wet flue gas continuously flows upwards in the secondary desulfurization tower 10, the saturated wet flue gas is subjected to removal of entrainment of mist drop slurry in the saturated wet flue gas after flowing through the single-stage ridge demister 13, and the water content in the flue gas at the outlet of the single-stage ridge demister 13 is 65.4mg/Nm3。
5. The desulfurized and demisted sintering clean flue gas continuously flows upwards in the secondary desulfurization tower 10 and enters the tube bundle type dust remover 14, the tube bundle type dust remover 14 is used for removing dust particles and slurry liquid drops in the sintering clean flue gas, and the dust concentration at the outlet of the tube bundle type dust remover 14 is ensured to be 31.2mg/Nm3。
6. The sintering clean flue gas after the double-tower double-circulation wet desulphurization process reaches the ultralow emission standard of desulphurization flue gas treatment, enters the chimney 16 along the clean flue gas flue 15 and is discharged at high altitude, and the flue gas treatment is completed.
Claims (4)
1. A double-tower double-circulation wet desulphurization device with series-parallel flues is characterized by comprising a butterfly valve (2), a raw flue gas flue (3), a primary desulphurization tower (4), a series flue (7), a bypass flue (8), a regulating valve (9), a secondary desulphurization tower (10), a porous tray (11), a multi-stage spraying layer (12), a single-stage ridge type demister (13), a tube bundle type dust remover (14) and a clean flue gas flue (15); the original flue gas flue (3) is connected with the inlet end of a first-stage desulfurizing tower (4), the outlet end of the first-stage desulfurizing tower (4) is connected with the inlet end of a second-stage desulfurizing tower (10) through a series flue (7), the outlet end of the second-stage desulfurizing tower (10) is connected with a chimney (16) through a clean flue gas flue (15), the first-stage desulfurizing tower (4) is connected with the second-stage desulfurizing tower (10) in parallel through a bypass flue (8), the inlet end of the bypass flue (8) is connected with the original flue gas flue (3), the outlet end of the bypass flue (8) is connected with the series flue (7), a butterfly valve (2) is arranged on the original flue gas flue (3), a regulating valve (9) is arranged on the bypass flue (8), a porous tray (11), a multi-stage spraying layer (12), a single-stage ridge demister (13) and a tube bundle type dust remover (14) are arranged inside the second-stage desulfurizing tower (10), and the porous tray (11) is positioned, the spraying layer (12) is positioned above the porous tray (11), the single-stage ridge type demister (13) is positioned above the spraying layer (12), and the tube bundle type dust remover (14) is positioned between the single-stage ridge type demister (13) and the outlet end of the second-stage desulfurizing tower (10).
2. The device according to claim 1, characterized in that the material of the porous tray (11) is 2205 duplex stainless steel.
3. The device according to claim 1, characterized in that the single-stage ridge mist eliminator (13) is made of PP material.
4. The apparatus of claim 1, wherein said multi-stage spray levels (12) are comprised of four spray levels, each spray level being a limestone-gypsum slurry.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110368792A (en) * | 2019-08-19 | 2019-10-25 | 北京首钢国际工程技术有限公司 | A kind of double tower Two-way Cycle wet desulphurization device for wearing series-parallel flue |
| CN112844016A (en) * | 2020-12-23 | 2021-05-28 | 河北大唐国际王滩发电有限责任公司 | Two-stage series tower type wet flue gas desulfurization device flow field optimization method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110368792A (en) * | 2019-08-19 | 2019-10-25 | 北京首钢国际工程技术有限公司 | A kind of double tower Two-way Cycle wet desulphurization device for wearing series-parallel flue |
| CN112844016A (en) * | 2020-12-23 | 2021-05-28 | 河北大唐国际王滩发电有限责任公司 | Two-stage series tower type wet flue gas desulfurization device flow field optimization method |
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