CN112354334A - Lime slurry preparation system of waste incineration plant - Google Patents
Lime slurry preparation system of waste incineration plant Download PDFInfo
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- CN112354334A CN112354334A CN202011231601.5A CN202011231601A CN112354334A CN 112354334 A CN112354334 A CN 112354334A CN 202011231601 A CN202011231601 A CN 202011231601A CN 112354334 A CN112354334 A CN 112354334A
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- lime
- venturi
- pipeline
- tank
- slurry
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 91
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 91
- 239000004571 lime Substances 0.000 title claims abstract description 91
- 239000002002 slurry Substances 0.000 title claims abstract description 79
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000004056 waste incineration Methods 0.000 title claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 33
- 230000029087 digestion Effects 0.000 claims abstract description 30
- 238000010790 dilution Methods 0.000 claims abstract description 29
- 239000012895 dilution Substances 0.000 claims abstract description 29
- 239000000428 dust Substances 0.000 claims abstract description 11
- 238000007865 diluting Methods 0.000 claims description 16
- 239000008399 tap water Substances 0.000 claims description 12
- 235000020679 tap water Nutrition 0.000 claims description 12
- 238000011010 flushing procedure Methods 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/10—Venturi scrubbers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a lime slurry preparation system for a waste incineration plant, which comprises a digestion device, a dilution device and a lime slurry conveying device, wherein the digestion device is used for digesting lime slurry; still include venturi dust collector, still set up first lime thick liquid return line, lime thick liquid return line one end with go out the pump line connection and the other end with venturi negative pressure suction washing device's first entry is connected. A steam collecting pipeline is further arranged at the top of the digestion tank, one end of the steam collecting pipeline is connected with the digestion tank, and the other end of the steam collecting pipeline is connected with a second inlet of the venturi negative pressure suction washing device; the outlet of the venturi negative pressure suction washing device is connected to the dilution tank. By adding a lime slurry backflow pipeline, a small part of output slurry of the lime slurry conveying device is conveyed to the atomizer, and the large part of output slurry flows into the Venturi negative pressure suction washing device through the first inlet, in the Venturi tube, wet and hot steam and backflow slurry are mixed and condensed and finally flow back to the dilution tank, and the wet and hot steam is effectively eliminated.
Description
Technical Field
The invention relates to a lime slurry preparation system for a waste incineration plant.
Background
With the rapid development of waste incineration power generation, the design and management of a flue gas treatment system of the waste incineration power generation system are increasingly mature and standard, in the aspect of flue gas deacidification process, a semi-dry deacidification system is generally adopted as a main deacidification process at present, and a dry deacidification system or a wet deacidification system is supplemented as an auxiliary deacidification process according to local emission standards. At present, a mainstream semidry deacidification system adopts a mode of spraying lime slurry by a high-speed rotary atomizer, and in order to ensure the high efficiency of neutralization reaction and take treatment cost into consideration, a lime slurry preparation system needs to be constructed in a matching manner, and the lime slurry is prepared on site by adopting quicklime.
The lime slurry preparation system mainly comprises a lime storage bin, a digestion tank, a dilution tank, a lime slurry conveying pump, a slurry conveying pipeline and the like. According to the lime slurry preparation and adding use process, when the dilution tank sends a low liquid level signal, lime in the lime bin is conveyed to the digestion tank through the lime discharge valve and the screw conveyor, meanwhile, tap water in a certain proportion enters the digestion tank to digest the lime, along with the rise of the liquid level of the digestion tank, the digested lime slurry overflows to the dilution tank through the overflow pipeline of the digestion tank, meanwhile, the tap water inlet valve of the dilution tank is opened to dilute the lime slurry to a proper preset concentration, and when the liquid level of the dilution tank reaches a high liquid level, the lime slurry preparation is stopped. Lime slurry in the dilution tank is conveyed to the atomizer through a lime slurry conveying pump and a lime slurry circulating pipeline for deacidification of flue gas, and the residual lime slurry flows back to the dilution tank. The flow of the lime slurry delivery pump is far greater than the actual lime slurry demand of the atomizer, and the delivery capacity of the lime slurry pump is usually 5-7 times of the actual demand of the atomizer, so that the flow rate of a pipeline is increased, the blockage of the delivery pipeline is avoided, and the residual lime slurry flows back to the dilution tank. Since the digestion process is exothermic, a certain amount of damp and hot steam carrying lime powder is generated in the digestion tank. At present, the part of steam is treated in a centralized spraying and washing mode after being sucked by a centrifugal fan, but the steam is easy to cause scaling and blockage of a spraying and washing system comprising a fan due to the fact that lime powder is carried in the steam, the spraying and washing system is difficult to stably run for a long time, and the system maintenance workload is large.
Disclosure of Invention
In order to solve the problems of unstable operation and large maintenance workload of a digestion tank hot steam washing system when lime slurry is prepared in a waste incineration plant, the invention provides a lime slurry preparation system of the waste incineration plant, which comprises a digestion device, a diluting device and a lime slurry conveying device; still include venturi dust collector, still set up first lime thick liquid return line, lime thick liquid return line one end with go out the pump line connection and the other end with venturi negative pressure suction washing device's first entry is connected. A steam collecting pipeline is further arranged at the top of the digestion tank, one end of the steam collecting pipeline is connected with the digestion tank, and the other end of the steam collecting pipeline is connected with a second inlet of the venturi negative pressure suction washing device; the outlet of the venturi negative pressure suction washing device is connected to the dilution tank. By adding a lime slurry backflow pipeline, a small part of output slurry of the lime slurry conveying device is conveyed to the atomizer, and the large part of output slurry flows into the Venturi negative pressure suction washing device through the first inlet, in the Venturi tube, wet and hot steam and backflow slurry are mixed and condensed and finally flow back to the dilution tank, and the wet and hot steam is effectively eliminated.
The technical scheme adopted by the invention for solving the technical problems is as follows: a lime slurry preparation system of a waste incineration plant comprises a digestion device, a dilution device and a lime slurry conveying device, wherein a solution prepared by the digestion device flows into the dilution device and is conveyed to an atomizer through the lime slurry conveying device;
the slaking device comprises a lime bin, an ash discharge valve, a screw conveyor and a slaking tank in sequence according to the flowing direction of lime slurry, and further comprises a first tap water branch pipeline flowing into the slaking tank;
the diluting device comprises a diluting tank, an overflow pipeline flowing into the diluting tank from the digestion tank, and a second tap water branch pipeline connected into the diluting tank;
the lime slurry conveying device comprises a conveying pump, a pump inlet pipeline flowing into the conveying pump from the dilution tank, and a slurry output pipeline conveyed to an atomizer by the conveying pump;
the system is characterized by further comprising a Venturi dust removal device, wherein the Venturi dust removal device comprises a Venturi negative-pressure suction washing device and a first lime slurry backflow pipeline, one end of the first lime slurry backflow pipeline is connected with the slurry output pipeline, and the other end of the first lime slurry backflow pipeline is connected with a first inlet of the Venturi negative-pressure suction washing device;
a steam collecting pipeline is further arranged at the top of the digestion tank, one end of the steam collecting pipeline is connected with the digestion tank, and the other end of the steam collecting pipeline is connected with a second inlet of the venturi negative pressure suction washing device; the outlet of the venturi negative pressure suction washing device is connected to the dilution tank.
Preferably, a second lime slurry backflow pipeline is further arranged, one end of the second lime slurry backflow pipeline is connected with the first lime slurry backflow pipeline, and the other end of the second lime slurry backflow pipeline is directly connected into the dilution tank.
Preferably, still set up venturi flushing pipe way, venturi flushing pipe way one end with second running water branch pipe says and the other end through the tee bend with first return pipe says and inserts together venturi negative pressure suction washing device's first entry sets up the valve on the pipeline, switches through the valve and right venturi negative pressure suction washing device washes.
Preferably, the steam collecting pipeline adopts a corrugated hose, and two ends of the steam collecting pipeline are connected by adopting a quick-connection flange.
The invention has the beneficial effects that: the invention provides a lime slurry preparation system for a waste incineration plant, which is characterized in that a Venturi dust removal device is arranged, the Venturi dust removal device comprises a Venturi negative pressure suction washing device, a lime slurry backflow pipeline is additionally arranged, a part of slurry in a slurry output pipeline of a lime slurry conveying device flows through the Venturi negative pressure suction washing device, in the Venturi pipe, wet and hot steam and backflow slurry are mixed and condensed, and finally, the mixture flows back to a dilution tank, so that the wet and hot steam is effectively eliminated.
Drawings
Fig. 1 is a schematic diagram of the arrangement of the apparatus according to the first embodiment of the present invention.
Fig. 2 is a schematic diagram of the arrangement of the apparatus according to a second embodiment of the present invention.
Fig. 3 is a schematic view of the arrangement of the apparatus according to the third embodiment of the present invention.
Fig. 4 is a schematic view of the arrangement of the apparatus according to the fourth embodiment of the present invention.
In the figure:
1, 1.1 lime bin, 1.2 ash discharge valve, 1.3 screw conveyer, 1.4 digestion tank and 1.5 first tap water branch pipeline;
2, a diluting device, 2.1 a diluting tank, 2.2 an overflow pipeline, 2.3A second tap water branch pipeline and 2.3A Venturi flushing pipeline;
3, a lime slurry conveying device, 3.1 conveying pumps, 3.2A pump inlet pipelines and 3.2B slurry outlet pipelines;
4 venturi dust collector, 4.1 venturi negative pressure suction washing device, 4.1A1 venturi first entry, 4.1A2 venturi second entry, 4.1B venturi second export, 4.2 first lime thick liquid return line, 4.2A second lime thick liquid return line, 4.21 tee bend, 4.3 steam collecting tube.
Detailed Description
Fig. 1 is a schematic diagram of the arrangement of the apparatus according to the first embodiment of the present invention. The figure shows that in the embodiment, the lime slurry preparation system of the waste incineration plant comprises a digestion device 1, a diluting device 2 and a lime slurry conveying device 3; the solution prepared in the digestion unit 1 flows into the dilution unit 2 and is then transported to the atomizer via the lime slurry transport unit 3.
The slaking device 1 sequentially comprises a lime bin 1.1, an ash discharge valve 1.2, a screw conveyor 1.3 and a slaking tank 1.4 according to the flowing direction of lime slurry, and also comprises a first tap water branch pipeline 1.5 flowing into the slaking tank;
the diluting device 2 comprises a diluting tank 2.1, an overflow pipeline 2.2 flowing from the digesting tank 1.4 to the diluting tank 2.1, and a second tap water branch pipeline 2.3 connected to the diluting tank 2.1;
the lime slurry conveying device 3 comprises a conveying pump 3.1, a pump inlet pipeline 3.2A flowing into the conveying pump 3.1 from the dilution tank 2.1, and a slurry output pipeline 3.2B conveyed to an atomizer by the conveying pump 3.1;
in the figure, the device also comprises a Venturi dust removal device 4, the Venturi dust removal device comprises a Venturi negative pressure suction washing device 4.1, a first lime slurry return pipeline 4.2 is also arranged, one end of the first lime slurry return pipeline 4.2 is connected with the slurry output pipeline 3.2B, and the other end of the first lime slurry return pipeline is connected with a first inlet 4.1A1 of the Venturi negative pressure suction washing device 4.1;
a steam collecting pipeline 4.3 is further arranged at the top of the digestion tank 1.4, one end of the steam collecting pipeline 4.3 is connected with the digestion tank 1.5, and the other end is connected with a second inlet 4.1A2 of the Venturi negative pressure suction washing device 4.1; the outlet 4.1B of the venturi negative pressure suction washing device 4.1 is connected to the dilution tank 2.1.
It is shown that in this example, by adding a first lime mud return line 4.2, a part of the mud in the mud outlet line 3.2B of the lime mud delivery device is made to flow through the venturi suction scrubber, where the moist heat steam is mixed with the returned mud and condensed, and finally returned to the dilution tank, thus effectively eliminating the moist heat steam.
Fig. 2 is a schematic diagram of the arrangement of the apparatus according to a second embodiment of the present invention. In the figure it is shown that, in contrast to the first embodiment, a second lime mud return line 4.2A is also provided, which second lime mud return line 4.2A is connected at one end to the first lime mud return line 4.2 and at the other end directly into the dilution tank 2.1.
Fig. 3 is a schematic view of the arrangement of the apparatus according to the third embodiment of the present invention. In the figure, it is shown that, unlike the first embodiment, in this example, a venturi flushing pipe 2.3A is further provided, one end of the venturi flushing pipe 2.3A is connected to the second tap water branch pipe 2.3, and the other end is connected to the first inlet 4.1a1 of the venturi negative pressure suction washing device 4.1 together with the first return pipe 4.2 through a tee joint 4.21, and a valve is provided on the pipe to flush the venturi negative pressure suction washing device 4.1 by switching the valve.
Fig. 4 is a schematic view of the arrangement of the apparatus according to the fourth embodiment of the present invention. In the figure, it is shown that, in contrast to the first embodiment, the steam collection line 4.3 is in this case a bellows line and is connected at both ends by quick-connect flanges.
Claims (4)
1. A lime slurry preparation system of a waste incineration plant comprises a digestion device, a dilution device and a lime slurry conveying device, wherein a solution prepared by the digestion device flows into the dilution device and is conveyed to an atomizer through the lime slurry conveying device;
the slaking device comprises a lime bin, an ash discharge valve, a screw conveyor and a slaking tank in sequence according to the flowing direction of lime slurry, and further comprises a first tap water branch pipeline flowing into the slaking tank;
the diluting device comprises a diluting tank, an overflow pipeline flowing into the diluting tank from the digestion tank, and a second tap water branch pipeline connected into the diluting tank;
the lime slurry conveying device comprises a conveying pump, a pump inlet pipeline flowing into the conveying pump from the dilution tank, and a slurry output pipeline conveyed to an atomizer by the conveying pump;
the system is characterized by further comprising a Venturi dust removal device, wherein the Venturi dust removal device comprises a Venturi negative-pressure suction washing device and a first lime slurry backflow pipeline, one end of the first lime slurry backflow pipeline is connected with the slurry output pipeline, and the other end of the first lime slurry backflow pipeline is connected with a first inlet of the Venturi negative-pressure suction washing device;
a steam collecting pipeline is further arranged at the top of the digestion tank, one end of the steam collecting pipeline is connected with the digestion tank, and the other end of the steam collecting pipeline is connected with a second inlet of the venturi negative pressure suction washing device; the outlet of the venturi negative pressure suction washing device is connected to the dilution tank.
2. The lime mud preparation system of claim 1, wherein a second lime mud recirculation line is further provided, one end of the second lime mud recirculation line is connected to the first lime mud recirculation line, and the other end of the second lime mud recirculation line is directly connected to the dilution tank.
3. The lime mud preparation system of claim 1, wherein a venturi flushing pipe is further provided, one end of the venturi flushing pipe is connected to the second tap water branch pipe, the other end of the venturi flushing pipe is connected to the first inlet of the venturi negative pressure suction washing device through a tee joint together with the first return pipe, and a valve is arranged on the pipe to flush the venturi negative pressure suction washing device through valve switching.
4. The lime mud preparation system of claim 1, wherein the steam collection pipe is a corrugated hose and is connected at both ends by a quick-connect flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011231601.5A CN112354334A (en) | 2020-11-06 | 2020-11-06 | Lime slurry preparation system of waste incineration plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011231601.5A CN112354334A (en) | 2020-11-06 | 2020-11-06 | Lime slurry preparation system of waste incineration plant |
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| Publication Number | Publication Date |
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| CN112354334A true CN112354334A (en) | 2021-02-12 |
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| CN202011231601.5A Pending CN112354334A (en) | 2020-11-06 | 2020-11-06 | Lime slurry preparation system of waste incineration plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112843947A (en) * | 2020-12-31 | 2021-05-28 | 深圳市能源环保有限公司 | Dust removal method for lime slurry preparation system of waste incineration plant |
-
2020
- 2020-11-06 CN CN202011231601.5A patent/CN112354334A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112843947A (en) * | 2020-12-31 | 2021-05-28 | 深圳市能源环保有限公司 | Dust removal method for lime slurry preparation system of waste incineration plant |
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Address after: 541000 Shankou domestic waste sanitary landfill, Shuikou village, Lingui Town, Lingui District, Guilin City, Guangxi Zhuang Autonomous Region Applicant after: Guilin Shenneng environmental protection Co.,Ltd. Applicant after: Chaozhou Shenneng environmental protection Co.,Ltd. Applicant after: Shenzhen Energy and environmental protection Co.,Ltd. Applicant after: Shenzhen Shenneng environmental protection East Co.,Ltd. Applicant after: Shenzhen Shenneng Environmental Protection City Environmental Service Co.,Ltd. Applicant after: WUHAN SHENNENG ENVIRONMENTAL PROTECTION NEW DITCH WASTE POWER GENERATION Co.,Ltd. Applicant after: Shanxian Shenneng environmental protection Co.,Ltd. Address before: 541000 Shankou domestic waste sanitary landfill, Shuikou village, Lingui Town, Lingui District, Guilin City, Guangxi Zhuang Autonomous Region Applicant before: Guilin Shenneng environmental protection Co.,Ltd. Applicant before: Chaozhou Shenneng environmental protection Co.,Ltd. Applicant before: SHENZHEN ENERGY ENVIRONMENTAL ENGINEERING Co.,Ltd. Applicant before: Shenzhen Shenneng environmental protection East Co.,Ltd. Applicant before: Shenzhen Shenneng Environmental Protection City Environmental Service Co.,Ltd. Applicant before: WUHAN SHENNENG ENVIRONMENTAL PROTECTION NEW DITCH WASTE POWER GENERATION Co.,Ltd. Applicant before: Shanxian Shenneng environmental protection Co.,Ltd. |