CN111672288A - Ammonium sulfate slurry ash removal structure and operation method - Google Patents
Ammonium sulfate slurry ash removal structure and operation method Download PDFInfo
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- CN111672288A CN111672288A CN202010544703.6A CN202010544703A CN111672288A CN 111672288 A CN111672288 A CN 111672288A CN 202010544703 A CN202010544703 A CN 202010544703A CN 111672288 A CN111672288 A CN 111672288A
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- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 229910052921 ammonium sulfate Inorganic materials 0.000 title claims abstract description 87
- 235000011130 ammonium sulphate Nutrition 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 63
- 239000002002 slurry Substances 0.000 title claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 159
- 239000010802 sludge Substances 0.000 claims abstract description 84
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 238000011010 flushing procedure Methods 0.000 claims abstract description 28
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 22
- 238000005352 clarification Methods 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 4
- 238000007865 diluting Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000013073 enabling process Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 abstract description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000002421 anti-septic effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000003981 vehicle Substances 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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
-
- 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
- B01D53/73—After-treatment of removed components
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides an ammonium sulfate slurry dedusting structure and an operation method thereof, which can effectively remove dust in ammonium sulfate slurry in a concentration section of a desulfurizing tower. The water inlet tank stirrer is arranged in the water inlet tank; the sludge conveying switch main valve is connected with the sludge discharge port; the inlet valve, the sludge conveying pump and the outlet valve are sequentially connected, the inlet valve is connected with the sludge conveying switch main valve through a pipeline, and the outlet valve is connected with the plate-and-frame filter press; the liquid inlet of the water inlet tank is connected with a check valve, the check valve is connected with an ammonium sulfate conveying pipeline, the ammonium sulfate conveying pipeline is connected with an ammonium sulfate discharge pump, and the ammonium sulfate discharge pump is connected with a concentration section of the desulfurizing tower; the process water inlet is connected with a water inlet valve, and the water inlet valve is connected with a water inlet pipeline; the drain port is connected with the emptying valve; the liquid outlet is connected with the emptying valve and the liquid inlet of the clarifying tank; the process water pipeline is connected with the process water tank, the water inlet pipeline and the flushing pipeline; the sludge flushing valve is arranged on a flushing pipeline, and the flushing pipeline is connected with a pipeline which is connected with the inlet valve and the sludge conveying switch main valve.
Description
Technical Field
The invention relates to an ammonium sulfate slurry ash removal structure and an operation method thereof, belonging to the technical field of flue gas ammonia desulphurization of coal-fired power plants.
Background
Coal-fired power plants mostly adopt pulverized coal as fuel for improving the coal-fired efficiency, the pulverized coal is combusted in a hearth of a boiler, hot flue gas formed after combustion contains dust and sulfur dioxide with high concentration, and high-temperature flue gas enters a dust remover through a flue at the tail part of the boiler for dust removal and then is subjected to sulfur dioxide removal through a desulfurization device and further dust removal. The concentration of dust in the flue gas after passing through the dust remover is generally controlled to be 30mg/Nm3However, the dust removal efficiency of the dust remover of some old power plants is lower, and the concentration of dust in the flue gas after the dust remover can only be controlled to be 50mg/Nm3。
For ammonia flue gas desulfurization engineering, ash removal is always a key and difficult point in the operation process, and particularly, the concentration of dust after a dust remover can only be controlled to be 50mg/Nm3When a large amount of dust is enriched in the ammonium sulfate slurry in the concentration section of the desulfurizing tower, the following disadvantages are generated:
1. dust in the ammonium sulfate thick liquid can seriously influence the crystallization of ammonium sulfate in the concentrated section, and the ammonium sulfate product also can be because the dust content is high and the crystal colour deepening becomes black, causes the unable normal sale of ammonium sulfate product, brings great loss for the enterprise.
2. The ash content in the ammonium sulfate slurry is more, so that the blockage of pipelines and equipment can be caused, and the reliability and continuous operation capability of the ash removal system in production operation can be greatly influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a reasonably designed ash removing structure and an operation method of ammonium sulfate slurry, which can effectively remove dust in the ammonium sulfate slurry in the concentration section of a desulfurizing tower.
The technical scheme adopted by the invention for solving the problems is as follows: an ammonium sulfate slurry ash removal structure comprises a concentration section of a desulfurizing tower; the method is characterized in that: the device also comprises a water inlet tank, a water inlet tank stirrer, a clarifying tank, a sludge delivery pump, a plate-and-frame filter press, a connecting pipeline assembly, an ammonium sulfate discharge pump, a process water tank and a process water pump; the water inlet tank is provided with a water inlet tank liquid inlet, a water outlet, a process water inlet and a drain outlet; the water inlet tank stirrer is arranged in the water inlet tank; the clarifying tank is provided with a liquid inlet and a sludge outlet of the clarifying tank; the connecting pipeline component comprises a check valve, a water inlet valve, a blow-down valve, a sludge conveying switch main valve, an inlet valve, a water inlet pipeline, an outlet valve, a flushing pipeline, a sludge flushing valve, a process water pipeline and an ammonium sulfate conveying pipeline; the sludge conveying switch main valve is connected with the sludge discharge port; the inlet valve, the sludge conveying pump and the outlet valve are sequentially connected, the inlet valve is connected with the sludge conveying switch main valve through a pipeline, and the outlet valve is connected with a liquid inlet pipeline of the plate-and-frame filter press; the liquid inlet of the water inlet tank is connected with a check valve, the check valve is connected with an ammonium sulfate conveying pipeline, the ammonium sulfate conveying pipeline is connected with an ammonium sulfate discharge pump, and the ammonium sulfate discharge pump is connected with a concentration section of the desulfurizing tower; the process water inlet is connected with a water inlet valve, and the water inlet valve is connected with a water inlet pipeline; the drain port is connected with the emptying valve; the liquid outlet is connected with the emptying valve and the liquid inlet of the clarifying tank; the inlet of the process water pipeline is connected with the process water tank through a process water pump, and the outlet of the process water pipeline is connected with the water inlet pipeline and the flushing pipeline; the sludge flushing valve is arranged on a flushing pipeline, and the flushing pipeline is connected with a pipeline which is connected with the inlet valve and the sludge conveying switch main valve.
The water inlet tank is provided with a manhole door.
The clarifying tank comprises a cylinder body and a cone, wherein the cone is fixedly arranged in the cylinder body, and a sludge discharge port is arranged at the bottom of the cone.
The clarifying tank is provided with a separating pipe and an overflow port, the separating pipe and the overflow port are both arranged on the barrel, and a liquid inlet of the clarifying tank is connected with the separating pipe; the cone is located below the separator tube.
The bottom of the cone is provided with a hand hole.
The cylinder body comprises an upper cylinder body and a lower cylinder body, wherein the upper cylinder body and the lower cylinder body are fixed together, and a cone is fixed in the lower cylinder body.
The water inlet tank is arranged at the top of the clarification tank.
The invention also comprises a pressure transmitter which is arranged on the liquid inlet pipeline of the plate-and-frame filter press.
The invention also comprises a sludge interface instrument which is arranged on the clarifying tank.
An operation method of an ammonium sulfate slurry ash removal structure is characterized in that: the method comprises the following steps:
1) after water is injected into the process water tank, a process water pump is started;
2) opening a water inlet valve, adding water into a water inlet tank, when the liquid level reaches the height of a liquid outlet, enabling process water to flow through a liquid inlet of the clarifying tank and a separation pipe through the liquid outlet and enter the clarifying tank, and opening a stirrer and a check valve of the water inlet tank until water flows out of an overflow port;
3) when the liquid level of the concentration section of the desulfurizing tower is higher than a set value, starting an ammonium sulfate discharge pump, pumping the ammonium sulfate slurry stored in the concentration section of the desulfurizing tower into a water inlet tank, diluting the ammonium sulfate slurry in the water inlet tank by process water, uniformly mixing the ammonium sulfate slurry by a water inlet tank stirrer, discharging the ammonium sulfate slurry from a liquid outlet, and feeding the ammonium sulfate slurry into a clarifying tank through a liquid inlet of the clarifying tank;
5) when the height of the sludge deposited in the clarification tank reaches a set value, opening a main sludge conveying switch valve, an inlet valve and an outlet valve, starting a plate-and-frame filter press, and finally starting a sludge conveying pump, wherein the sludge in the clarification tank is pumped to the plate-and-frame filter press for filtration;
6) when the height of the sludge deposited in the clarifying tank is reduced to a set value, closing the ammonium sulfate discharge pump, closing the water inlet valve, the sludge conveying pump and the sludge conveying switch main valve after a period of time in order to further discharge the sludge in the clarifying tank, and closing the plate-and-frame filter press, the inlet valve and the outlet valve after opening the sludge flushing valve for flushing;
7) and closing the water inlet tank stirrer, opening the emptying valve to empty the water inlet tank, opening the water inlet valve to flush, and not emptying the liquid in the clarifying tank.
Compared with the prior art, the invention has the following advantages and effects: 1. the method has the advantages of simple principle, convenient operation, small occupied area and low engineering investment cost, can effectively remove dust in the ammonium sulfate slurry at the concentration section of the desulfurizing tower, improves the quality of ammonium sulfate products, and prevents pipelines and equipment from being blocked; 2. the practical use of the project has good ash removal effect, low energy consumption, low operation cost and high reliability; 3. the ammonium sulfate slurry in the concentration section of the desulfurizing tower is diluted by the water inlet tank, so that the problem of blockage of pipelines and equipment in the ash removing process is well solved; 4. the water inlet tank is internally provided with a water inlet tank stirrer, so that ammonium sulfate slurry with higher concentration and water are uniformly mixed and then enter the clarifying tank, and the ash removal effect is good.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
The invention relates to an ammonium sulfate slurry ash removal structure, which comprises a water inlet tank 1, a water inlet tank stirrer 2, a clarifying tank 3, a sludge interface instrument 4, a sludge delivery pump 5, a pressure transmitter 6, a plate-and-frame filter press 7, a connecting pipeline assembly 8, a desulfurizing tower concentration section 9, an ammonium sulfate discharge pump 10, a process water tank 101 and a process water pump 102.
The water inlet tank 1 is provided with a water inlet tank inlet 11, a water outlet 12, a process water inlet 13, a drain port 14 and a manhole door 15. The water inlet tank 1 is made of Q235-B and is subjected to anti-corrosion treatment by using glass flakes, and the water inlet tank 1 is used for diluting high-concentration ammonium sulfate slurry in a concentration section of the desulfurizing tower so as to prevent equipment and pipelines from being blocked. The mode that the upper portion of bottom feed liquid goes out is adopted to the case of intaking 1, and the distance of 11 centers at the case of intaking is 450mm from the bottom plate, the distance of 12 centers at the liquid outlet is 100mm from the roof, and case of intaking 11 and the liquid outlet 12 are the horizontal direction, and case of intaking 11 pipe diameters of liquid inlet is less than liquid outlet 12. The manhole door 15 is arranged at the lower part of the water inlet tank 1 and has the specification of DN 600. The process water inlet 13 is arranged at the top of the water inlet tank 1 and is vertically arranged, and the length of the process water inlet is 200 mm. The drain port 14 is arranged at the bottom of the water inlet tank 1, and the drain port 14 is attached to the bottom plate of the water tank 1 so as to drain the liquid in the water inlet tank.
The water inlet tank stirrer 2 is arranged in the center of the water inlet tank 1. The water inlet tank stirrer 2 is of a jacking type, the blades and the shaft are made of carbon steel lining rubber, and the water inlet tank stirrer 2 is used for uniformly stirring the ammonium sulfate slurry in the diluted water inlet tank. The blades of the water inlet tank stirrer 2 are 200mm away from the bottom of the tank.
The clarifying tank 3 comprises a cylinder body and a cone 36, and is provided with a clarifying tank liquid inlet 31, a separating pipe 32, an overflow port 33 and a sludge discharge port 34. The center of the liquid inlet 31 of the clarifying tank is 800mm away from the tank top, the center of the overflow port 33 is 300mm away from the tank top, and the pipe diameters of the liquid inlet 31 of the clarifying tank, the overflow port 33 and the liquid outlet 12 of the water inlet tank are consistent.
The cylinder body is made of Q235-B and is subjected to antiseptic treatment by using glass flakes, ammonium sulfate slurry from a concentration section of the desulfurizing tower diluted by the water inlet tank is deposited with dust in a clarifying tank, supernatant automatically flows into a trench, and sludge deposited at the lower part enters a plate-and-frame filter press 7 after being settled.
The separating pipe 32 and the overflow port 33 are both arranged on the cylinder body, the separating pipe 32 is fixed at the center of the clarification tank 3, and the overflow port 33 is connected to the trench. The separation pipe 32 is thin at the top and thick at the bottom, and the design of reducing is adopted, so that the impact on the cone 36 can be reduced, and the blockage of the separation pipe 32 in the operation process can be avoided. The separating tube 32 is made of 2205 material. The ammonium sulfate slurry flows downwards in the separating pipe 32 at a high flow speed and enters the clarifying tank after passing through the cone 36, but the flow speed of the ammonium sulfate slurry is greatly reduced, and the particles in the slurry continuously move downwards due to inertia, so that the effect of separating dust is achieved.
The liquid inlet 31 of the clarifying tank is connected with a separation pipe 32. The liquid inlet 31 of the clarifying tank extends into the center of the separating pipe 32, the outlet is upward, and the material 2205 is adopted.
The cone 36 is fixedly mounted within the barrel and is located below the separator tube 32. The bottom of the cone 36 is provided with a hand hole, which is convenient for maintenance.
The sludge discharge port 34 is arranged at the bottom of the cone 36, the center of the sludge discharge port is 100mm away from the lower bottom surface of the cone 36, and the sludge discharge port is made of 2205 materials.
The cylinder includes an upper cylinder 35 and a lower cylinder 37. The upper cylinder 35 and the lower cylinder 37 are welded together, and the cone 36 is welded and fixed in the lower cylinder 37 and is positioned 600mm below the upper cylinder 35. The upper cylinder 35 and the lower cylinder 37 have the same height. The lower cylinder 37 is provided with an inspection manhole close to the bottom plate. The upper cylinder 35 and the cone 36 are contacted with ammonium sulfate slurry, and glass flakes are adopted for anti-corrosion treatment.
The water inlet tank 1 is arranged at the top of the barrel body of the clarification tank 3.
The connecting pipe assembly 8 includes a check valve 81, a water inlet valve 82, a blow-down valve 83, a sludge transfer switch main valve 84, an inlet valve 85, a water inlet pipe 86, an outlet valve 87, a flushing pipe 88, a sludge flushing valve 89, a process water pipe 810 and an ammonium sulfate transfer pipe 811.
The sludge delivery switch main valve 84 is connected with the sludge discharge port 34.
The inlet valve 85, the sludge conveying pump 5 and the outlet valve 87 are sequentially connected through pipelines to form a sludge conveying pipeline, the inlet valve 85 is connected with the sludge conveying switch main valve 84 through a pipeline, and the outlet valve 87 is connected with a liquid inlet pipeline of the plate-and-frame filter press 7; in this embodiment, the sludge conveying pipelines are two and are arranged in parallel. The sludge transfer pump 5 transfers the dust precipitated in the clarifying tank to a plate-and-frame filter press, adopts a pneumatic diaphragm pump, has the lift of about 80m, and is configured by one use and one standby.
The inlet 11 of the water inlet tank is connected with a check valve 81 through a flange, the check valve 81 is connected with an ammonium sulfate conveying pipeline 811, the ammonium sulfate conveying pipeline 811 is connected with an ammonium sulfate discharge pump 10, and the ammonium sulfate discharge pump 10 is connected with a concentration section 9 of the desulfurizing tower. In this embodiment, two ammonium sulfate discharge pumps 10 are provided in parallel. The concentration section 9 of the desulfurizing tower is made of Q235-B and is subjected to antiseptic treatment by glass flakes, and the function of the section is to store ammonium sulfate slurry. The ammonium sulfate discharge pump 10 is used for conveying high-concentration ammonium sulfate slurry in the concentration section of the desulfurization tower to the water inlet tank.
The process water inlet 13 is connected with the water inlet valve 82 through a flange, and the water inlet valve 82 is connected with the water inlet pipeline 86.
The drain port 14 is connected with the emptying valve 83 through a flange.
The liquid outlet 12 and the emptying valve 83 are respectively connected with a liquid outlet pipeline and a drain pipeline and then are converged into a main pipe to be connected with the liquid inlet 31 of the clarifying tank 3. The process water conduit 810 has an inlet connected to the process water tank 101 via the process water pump 102 and an outlet connected to the water inlet conduit 86 and the flush conduit 88. In this embodiment, two process water pumps 102 are provided and are connected in parallel.
The sludge flushing valve 89 is installed on the flushing pipe 88, and the flushing pipe 88 is connected with a pipe connecting the inlet valve 85 and the sludge delivery switch main valve 84.
The sludge interface instrument 4 is arranged at the top of the clarification tank 3. The sludge interface instrument 4 is used for measuring the height of sludge deposited in the clarifying tank.
And the pressure transmitter 6 is arranged on a liquid inlet pipeline of the plate-and-frame filter press 7 and is used for measuring the pressure at the inlet of the plate-and-frame filter press. The pressure of the liquid inlet pipeline of the plate-and-frame filter press 7 is not lower than 0.6 MPa.
The sludge delivery pump 5, the ammonium sulfate discharge pump 10 and the process water pump 102 are all configured in a one-use-one-standby mode, so that the running stability of the ash removal system can be greatly improved. The ammonium sulfate discharge pump 10 and the process water pump 102 are centrifugal pumps, wherein the ammonium sulfate discharge pump 10 is a variable frequency motor.
An operation method of an ammonium sulfate slurry ash removal structure comprises the following steps:
1) and the equipment, valves, instruments, pipelines and the like in the system are installed and corresponding detection tests are carried out to complete equipment power transmission and monomer debugging. And (4) checking the states of the equipment and the valves, wherein all the equipment and the valves except the instrument valve are in a closed state.
2) And injecting water into the process water tank 101, and starting any one of the process water pumps 102 when the liquid level reaches more than 4 m. When the desulfurizer is operated, the process water pump 102 is continuously operated.
3) And opening the water inlet valve 82, adding water into the water inlet tank 1, when the liquid level reaches the height of the liquid outlet 12, enabling the process water to flow through the liquid inlet 31 and the separation pipe 32 of the clarification tank through the liquid outlet 12 and enter the clarification tank 3, and opening the water inlet tank stirrer 2 and the check valve 81 until water flows out from the overflow port 33.
4) And when the liquid level of the concentration section 9 of the desulfurizing tower is more than 1.5m, starting any one of the ammonium sulfate discharge pumps 10. Ammonium sulfate thick liquid of storage in the concentrated section 9 of desulfurizing tower is pumped into case 1 of intaking, in case 1 of intaking diluted by process water, and discharge by liquid outlet 12 after 2 misce benes of case agitator of intaking, get into separator tube 32 through clarification tank inlet 31, ammonium sulfate thick liquid falls with higher velocity of flow in separator tube 32, then get into in the clarification tank 3, the velocity of flow of ammonium sulfate thick liquid can greatly reduced in clarification tank 3, particulate matter in the ammonium sulfate thick liquid continues downstream because of inertia, the final sedimentation is in cone 36, the supernatant is then by overflow mouth 33 inflow trench, collect the pit and reuse.
5) And when the sludge interface instrument 4 displays that the height of the sludge deposited in the cone 36 reaches more than 2m, opening a main sludge conveying switch valve 84, an inlet valve 85 and an outlet valve 87, starting the plate-and-frame filter press 7, finally starting the sludge conveying pump 5, wherein the indication number of the pressure transmitter 6 is about 0.6MPa, the sludge in the clarification tank 3 is pumped to the plate-and-frame filter press 7 for filtration, filter cakes enter a sludge warehouse for accumulation, the filter cakes are transported away by a vehicle, and filtrate and supernatant automatically flow into a trench and are collected to a pit for reuse.
6) And when the sludge interface instrument 4 displays that the height of the sludge in the cone 36 is reduced to 0.5m, closing the ammonium sulfate discharge pump 10, closing the water inlet valve 82, the sludge conveying pump 5 and the sludge conveying switch main valve 84 after about 10min for further discharging the sludge in the cone 36, opening the sludge flushing valve 89 for flushing for 5min, closing, and closing the plate and frame filter press 7, the inlet valve 85 and the outlet valve 87.
7) The water inlet tank stirrer 2 is closed, the water inlet tank 1 is emptied by opening the emptying valve 83, and the water inlet valve 82 is opened for flushing. The liquid in the clarifying tank 3 is not emptied, so that the ash removal system is conveniently started again.
The implementation case is as follows: taking ammonia-process flue gas desulfurization engineering of a certain chemical plant as an example, the concentration of dust at the inlet of a desulfurizing tower is 50mg/Nm3The size of the water inlet tank 1 is ∅ 1000mm × H1400mm, the size of the clarifying tank 3 is ∅ 3500mm × H6000mm, the heights of the upper cylinder 35 and the lower cylinder 37 are both 3000mm, the height of the cone 36 is 2500mm, and the flow rate of the sludge conveying pump 5 is 5m3H, lift 60m, flow 5m of plate-and-frame filter press 73H, filtration area 40m2Ammonium sulfate discharge pump 10 flow rate of 60m3H, lift 48m, desulfurizationThe diameter of the column thickening section 9 is 13.5 m. The inlet tank 1 has a water inlet 11 of DN65, a water outlet 12 of DN100, a process water inlet 13 of DN25 and a drain outlet 14 of DN 50. The liquid inlet 31 of the clarifying tank 3 of the clarifying tank is DN100, the upper part of the separating pipe 32 is DN300, the lower part is DN400, the overflow port 33 is DN100, and the sludge discharge port 34 is DN 80.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. An ammonium sulfate slurry ash removal structure comprises a concentration section of a desulfurizing tower; the method is characterized in that: the device also comprises a water inlet tank, a water inlet tank stirrer, a clarifying tank, a sludge delivery pump, a plate-and-frame filter press, a connecting pipeline assembly, an ammonium sulfate discharge pump, a process water tank and a process water pump; the water inlet tank is provided with a water inlet tank liquid inlet, a water outlet, a process water inlet and a drain outlet; the water inlet tank stirrer is arranged in the water inlet tank; the clarifying tank is provided with a liquid inlet and a sludge outlet of the clarifying tank; the connecting pipeline component comprises a check valve, a water inlet valve, a blow-down valve, a sludge conveying switch main valve, an inlet valve, a water inlet pipeline, an outlet valve, a flushing pipeline, a sludge flushing valve, a process water pipeline and an ammonium sulfate conveying pipeline; the sludge conveying switch main valve is connected with the sludge discharge port; the inlet valve, the sludge conveying pump and the outlet valve are sequentially connected, the inlet valve is connected with the sludge conveying switch main valve through a pipeline, and the outlet valve is connected with a liquid inlet pipeline of the plate-and-frame filter press; the liquid inlet of the water inlet tank is connected with a check valve, the check valve is connected with an ammonium sulfate conveying pipeline, the ammonium sulfate conveying pipeline is connected with an ammonium sulfate discharge pump, and the ammonium sulfate discharge pump is connected with a concentration section of the desulfurizing tower; the process water inlet is connected with a water inlet valve, and the water inlet valve is connected with a water inlet pipeline; the drain port is connected with the emptying valve; the liquid outlet is connected with the emptying valve and the liquid inlet of the clarifying tank; the inlet of the process water pipeline is connected with the process water tank through a process water pump, and the outlet of the process water pipeline is connected with the water inlet pipeline and the flushing pipeline; the sludge flushing valve is arranged on a flushing pipeline, and the flushing pipeline is connected with a pipeline which is connected with the inlet valve and the sludge conveying switch main valve.
2. The ammonium sulfate slurry ash removal structure of claim 1, wherein: the water inlet tank is provided with a manhole door.
3. The ammonium sulfate slurry ash removal structure of claim 1, wherein: the clarifying tank comprises a cylinder body and a cone, the cone is fixedly arranged in the cylinder body, and the sludge discharge port is arranged at the bottom of the cone.
4. The ammonium sulfate slurry ash removal structure of claim 3, characterized in that: the clarifying tank is provided with a separation pipe and an overflow port, the separation pipe and the overflow port are both arranged on the barrel, and a liquid inlet of the clarifying tank is connected with the separation pipe; the cone is located below the separator tube.
5. The ammonium sulfate slurry ash removal structure of claim 3, characterized in that: the bottom of the cone is provided with a hand hole.
6. The ammonium sulfate slurry ash removal structure of claim 3, characterized in that: the cylinder body comprises an upper cylinder body and a lower cylinder body, the upper cylinder body and the lower cylinder body are fixed together, and the cone is fixed in the lower cylinder body.
7. The ammonium sulfate slurry ash removal structure of claim 1, wherein: the water inlet tank is arranged at the top of the clarification tank.
8. The ammonium sulfate slurry ash removal structure of claim 1, wherein: the filter press also comprises a pressure transmitter which is arranged on a liquid inlet pipeline of the plate-and-frame filter press.
9. The ammonium sulfate slurry ash removal structure of claim 1, wherein: the device also comprises a sludge interface instrument which is arranged on the clarifying tank.
10. A method of operating an ammonium sulfate slurry ash removal structure as defined in any one of claims 1 to 9, characterized by: the method comprises the following steps:
1) after water is injected into the process water tank, a process water pump is started;
2) opening a water inlet valve, adding water into a water inlet tank, when the liquid level reaches the height of a liquid outlet, enabling process water to flow through a liquid inlet of the clarifying tank and a separation pipe through the liquid outlet and enter the clarifying tank, and opening a stirrer and a check valve of the water inlet tank until water flows out of an overflow port;
3) when the liquid level of the concentration section of the desulfurizing tower is higher than a set value, starting an ammonium sulfate discharge pump, pumping the ammonium sulfate slurry stored in the concentration section of the desulfurizing tower into a water inlet tank, diluting the ammonium sulfate slurry in the water inlet tank by process water, uniformly mixing the ammonium sulfate slurry by a water inlet tank stirrer, discharging the ammonium sulfate slurry from a liquid outlet, and feeding the ammonium sulfate slurry into a clarifying tank through a liquid inlet of the clarifying tank;
5) when the height of the sludge deposited in the clarification tank reaches a set value, opening a main sludge conveying switch valve, an inlet valve and an outlet valve, starting a plate-and-frame filter press, and finally starting a sludge conveying pump, wherein the sludge in the clarification tank is pumped to the plate-and-frame filter press for filtration;
6) when the height of the sludge deposited in the clarifying tank is reduced to a set value, closing the ammonium sulfate discharge pump, closing the water inlet valve, the sludge conveying pump and the sludge conveying switch main valve after a period of time in order to further discharge the sludge in the clarifying tank, and closing the plate-and-frame filter press, the inlet valve and the outlet valve after opening the sludge flushing valve for flushing;
7) and closing the water inlet tank stirrer, opening the emptying valve to empty the water inlet tank, opening the water inlet valve to flush, and not emptying the liquid in the clarifying tank.
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