CN112939422A - Fly ash melting water quenching water saving system and method - Google Patents
Fly ash melting water quenching water saving system and method Download PDFInfo
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- CN112939422A CN112939422A CN202110109490.9A CN202110109490A CN112939422A CN 112939422 A CN112939422 A CN 112939422A CN 202110109490 A CN202110109490 A CN 202110109490A CN 112939422 A CN112939422 A CN 112939422A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 304
- 238000010791 quenching Methods 0.000 title claims abstract description 217
- 230000000171 quenching effect Effects 0.000 title claims abstract description 217
- 239000010881 fly ash Substances 0.000 title claims abstract description 52
- 238000002844 melting Methods 0.000 title claims abstract description 35
- 230000008018 melting Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000498 cooling water Substances 0.000 claims abstract description 69
- 239000002893 slag Substances 0.000 claims abstract description 32
- 238000009833 condensation Methods 0.000 claims abstract description 9
- 230000005494 condensation Effects 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 109
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 230000001502 supplementing effect Effects 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 10
- 230000003068 static effect Effects 0.000 claims description 6
- 230000004927 fusion Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000010813 municipal solid waste Substances 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000004056 waste incineration Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000002920 hazardous waste Substances 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 206010053615 Thermal burn Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 210000004127 vitreous body Anatomy 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/23—Cooling the molten glass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
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- Gasification And Melting Of Waste (AREA)
Abstract
The invention discloses a fly ash melting water quenching water-saving system which is characterized by comprising a fly ash melting water quenching cooling water closed circulation system and a fly ash melting water quenching steam condensation recovery system; the closed circulating system of the fly ash melting water quenching cooling water consists of a water quenching pool, a water quenching circulating pump, a plate heat exchanger, an auxiliary pipeline, a valve, an instrument and the like. The fly ash melting water quenching steam condensation recovery system comprises a gas collecting hood, a draught fan, a steam condenser, a condensate tank, a condensate delivery pump, an auxiliary pipeline valve instrument and the like. The fly ash melting water quenching water saving system can timely absorb steam generated by slag water quenching through the negative pressure gas collecting hood, achieves organized discharge of the steam, and prevents the steam from scalding operators and equipment. Also provides a water-saving method for fly ash fusion water quenching.
Description
Technical Field
The invention belongs to the technical field of household garbage incineration fly ash melting treatment equipment, and particularly relates to a fly ash melting water quenching water-saving system and a fly ash melting water quenching water-saving method.
Background
The waste incineration fly ash is solid particles generated in the municipal domestic waste incineration process. In the process of incinerating the garbage, organic matters in the garbage are mainly discharged in the form of gaseous substances; the inorganic matter mainly forms solid particles, wherein large solid particles are deposited on the bottom of the incinerator and a fire grate and are called bottom ash, fine particles float in the flue gas and enter a flue gas purification system along with the flue gas, the particles form 50% of incineration fly ash, the rest incineration fly ash is derived from limestone or active carbon added in the flue gas purification process, the limestone or active carbon and the active carbon are captured and collected in a dust collector (an electrostatic dust collector, a cloth bag dust collector and the like), meanwhile, a part of fine particles are settled at the bottom of a flue and a chimney, and the fine particles captured and settled are called incineration fly ash. For a mechanical grate furnace, the generation amount of the waste incineration fly ash is about 3-5% of the amount of primary waste entering the furnace; for the fluidized bed incinerator, the fly ash production amount is 8-15% of the raw garbage entering the incinerator, and the average is about 10%.
In the national hazardous waste entry (2020 edition), waste incineration fly ash is listed as hazardous waste, the waste category HW18, code 772-. Therefore, the fly ash must be collected separately, and must not be mixed with household garbage, incineration residue, etc., and other hazardous wastes.
The fly ash melting is that the temperature in the melting furnace is 1300-1500 ℃, the pretreated fly ash is melted, and the molten slag is water-quenched to form glass slag. Meanwhile, heavy metals in the fly ash are solidified in the vitreous body, the leaching rate is extremely low, the environmental protection requirement is met, the fly ash can be used as general industrial solid waste to realize resource utilization, dioxin is thoroughly decomposed at high temperature, and high-temperature flue gas can reach the standard after being purified and discharged.
The existing slag water quenching adopts an open water quenching pool, and has the main disadvantages that:
(1) a large amount of steam is generated during slag water quenching, peripheral operators are easily scalded by the steam, and electrical devices such as peripheral cables and the like are easily damaged;
(2) the slag water quenching steam is discharged in an unorganized mode, so that water quenching cooling water loss is caused, and water resources are wasted due to long-term water quenching operation;
(3) the higher the temperature of the slag water quenching cooling water is, the lower the cooling rate of the slag is, thereby influencing the content of a glass phase formed by the slag and the heavy metal leaching index.
Disclosure of Invention
The invention aims to provide a fly ash melting water quenching water saving system which can absorb steam generated by slag water quenching through a negative pressure gas collecting hood in time, realize organized discharge of the steam and prevent the steam from scalding operators and equipment.
The second purpose of the invention is to provide a water-saving method for fly ash fusion water quenching.
The first technical scheme adopted by the invention is that the fly ash melting water quenching water-saving system comprises a fly ash melting water quenching cooling water closed circulation system and a fly ash melting water quenching steam condensation recovery system;
the closed circulating system of the fly ash melting water quenching cooling water comprises a water quenching pool, wherein a water supplementing pipe is arranged above the water quenching pool and is communicated with the water quenching pool, a water supplementing adjusting valve is arranged on the water supplementing pipe, a water quenching pool liquid level meter is arranged on one side of the side wall of the water quenching pool, and the water quenching pool liquid level meter is communicated with the side wall of the water quenching pool through a first pipeline and a second pipeline; the device also comprises a water quenching circulating pump, wherein a liquid inlet of the water quenching circulating pump is communicated with the side wall of the water quenching pool through a third pipeline, a liquid outlet of the water quenching circulating pump is connected with a plate heat exchanger through a fourth pipeline, and one end part of the fourth pipeline is connected with a water quenching cooling water inlet of the plate heat exchanger; a water quenching cooling water outlet of the plate heat exchanger is connected with a fifth pipeline, and one end of the fifth pipeline is communicated with the water quenching tank;
the fly ash melting water quenching steam condensation recovery system comprises a condensate tank and a gas collecting hood arranged above the water quenching tank, wherein the gas collecting hood is connected with an induced draft fan through an eighth pipeline, the induced draft fan is also connected with a steam condenser through a ninth pipeline, and a condensate outlet of the steam condenser is communicated with the top wall of the condensate tank through a tenth pipeline; a condensate tank liquid level meter is further arranged on one side of the side wall of the condensate tank and is communicated with the side wall of the condensate tank through a thirteenth pipeline and a fourteenth pipeline; still including the lime set delivery pump, the inlet of lime set delivery pump is through twelfth pipeline and lime set jar lateral wall intercommunication, and the liquid outlet of lime set delivery pump is through eleventh pipeline and shrend pond intercommunication.
The present invention is also characterized in that,
and a U-shaped liquid seal pipe is arranged on the tenth pipeline.
Ball valves are arranged on the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the eleventh pipeline, the twelfth pipeline, the thirteenth pipeline and the fourteenth pipeline;
a circulating cooling water inlet of the plate heat exchanger is connected with a sixth pipeline, and a cold water valve of the plate heat exchanger is arranged on the sixth pipeline; a circulating cooling water inlet of the plate heat exchanger is connected with a seventh pipeline, and a valve is arranged on the seventh pipeline; and a cooling water inlet of the steam condenser is connected with a fifteenth pipeline, a cold water valve of the steam condenser is arranged on the fifteenth pipeline, a cooling water outlet of the steam condenser is connected with a sixteenth pipeline, and a valve is arranged on the sixteenth pipeline.
The eighth pipeline and the ninth pipeline are both provided with butterfly valves.
Part of water replenishing pipes on two sides of the water replenishing regulating valve are also communicated through a bypass pipe; two sides of the water replenishing regulating valve are respectively provided with a ball valve, and each ball valve is positioned on the water replenishing pipe between the end part of the bypass pipe and the water replenishing regulating valve; the bypass pipe is also provided with a stop valve; and a drain pipe is also arranged on the water replenishing pipe between one of the ball valves and the water replenishing regulating valve, and the drain pipe is provided with a ball valve.
And a thermometer is also arranged on the side wall of the water quenching tank.
An overflow port is arranged on the side wall of the condensate tank; and the top wall of the condensate tank is provided with a vent hole.
The second technical scheme adopted by the invention is that a fly ash fusion water quenching water-saving method is implemented by adopting the system according to the following steps:
the first step is as follows: water supplement in water quenching tank
Opening a water replenishing regulating valve, starting water replenishing of the water quenching tank, and closing the water replenishing regulating valve when a liquid level meter of the water quenching tank displays that the liquid level value reaches 80% of the highest liquid level;
then, the liquid level meter and the water replenishing regulating valve of the water quenching tank are connected with the PLC control system to be used in a linkage control mode; linkage control content:
when the liquid level meter of the water quenching tank is 30% lower than the highest liquid level, the liquid level meter of the water quenching tank alarms at a low position, and meanwhile, the water replenishing regulating valve is controlled to be automatically opened to start water replenishing to the water quenching tank; when the liquid level meter of the water quenching tank is higher than 80% of the highest liquid level, the water supplementing regulating valve is automatically closed;
the second step is that: steam condenser for use
Opening a cooling water inlet and outlet valve of the steam condenser to ensure that the cooling water circulates normally;
the third step: for induced draft fan
Opening a valve on an eighth pipeline connected with an inlet of the induced draft fan, starting the induced draft fan, and then opening a valve on a ninth pipeline connected with an outlet of the induced draft fan;
the fourth step: slag feeding of water quenching tank
Opening a slag outlet of the melting furnace, and allowing molten slag to enter a water quenching tank for molten slag water quenching;
the fifth step: plate heat exchanger is put into operation
When the temperature of the cooling water in the water quenching tank rises to 80 ℃, opening a circulating cooling water inlet and outlet valve;
and a sixth step: water quenching circulating pump
After the fifth step of operation, opening a valve on a third pipeline at the inlet of the water quenching circulating pump, starting the water quenching circulating pump, then opening a valve on a fourth pipeline at the outlet of the water quenching circulating pump, at the moment, starting closed cooling circulation of water quenching cooling water, pumping the water quenching cooling water at 80 ℃ to a plate heat exchanger through the water quenching circulating pump, exchanging heat with circulating cooling water, cooling the water quenching cooling water to 50 ℃, and then returning the water quenching cooling water to a water quenching pool;
then, the liquid level meter of the water quenching pool and the water quenching circulating pump are both connected with the PLC control system and are used in a linkage control mode;
linkage control content:
in the operation process, when the liquid level meter of the water quenching tank is lower than the highest liquid level by 20%, the liquid level meter of the water quenching tank alarms at a low position, and meanwhile, the water quenching circulating pump automatically stops operating;
the seventh step: the condensate tank is put into use
When the static pressure of the condensate in the condensate pipeline of the steam condenser 6 exceeds the static pressure of the water stored in the U-shaped liquid seal pipe, the condensate flows to a condensate tank through a tenth pipeline;
eighth step: for feeding condensate conveying pump
When the condensate tank liquid level meter reaches 80% of the maximum liquid level, the condensate tank liquid level meter gives an alarm in a high position, meanwhile, a valve on the twelfth pipeline is opened, a condensate delivery pump is started, a valve on the eleventh pipeline is opened, and steam condensate in the condensate tank is sent to a water quenching pool; meanwhile, a condensate tank liquid level meter and a condensate conveying pump are both connected with the PLC control system and are used in a linkage control mode;
linkage control content:
when the liquid level meter of the condensate tank reaches the maximum liquid level of 30 percent, the liquid level meter of the condensate tank starts low-level alarm; when the condensate tank liquid level meter reaches the maximum liquid level of 20%, the condensate tank liquid level meter starts low-level alarm, and meanwhile, the condensate conveying pump automatically stops running.
The invention has the beneficial effects that:
(1) in the system, steam generated by slag water quenching is absorbed by the negative-pressure gas-collecting hood, so that organized discharge of the steam is realized, and the steam is prevented from scalding operators and equipment;
(2) in the system, steam generated by slag water quenching is absorbed and condensed and then is reused for slag water quenching, so that water is saved;
(3) in the method, the closed circulation of the slag water quenching cooling water is realized, the temperature of the cooling water is maintained at 50-80 ℃ through the plate heat exchanger, and meanwhile, the water quenching steam generation amount is reduced, and the water saving effect is also realized.
Drawings
FIG. 1 is a process flow diagram of a water-saving method for fly ash fusion water quenching according to the present invention.
In the drawing, 1, a water quenching tank, 2, a water quenching circulating pump, 3, a plate heat exchanger, 4, a gas collecting hood, 5, an induced draft fan, 6, a steam condenser, 7, a condensate tank, 8, a condensate delivery pump, 9, a water quenching tank liquid level meter, 10, a water replenishing regulating valve, 11, a thermometer, 12, a condensate tank liquid level meter, 13, a U-shaped liquid seal pipe, 14, a plate heat exchanger cold water valve, 15, a steam condenser cold water valve, 16, a water replenishing pipe, 17, a first pipeline, 18, a second pipeline, 19, a third pipeline, 20, a fourth pipeline, 21, a fifth pipeline, 22, a sixth pipeline, 23, a seventh pipeline, 24, an eighth pipeline, 25, a ninth pipeline, 26, a tenth pipeline, 27, an eleventh pipeline, 28, a twelfth pipeline, 29, a thirteenth pipeline, 30, a fourteenth pipeline, 31, a sixteenth pipeline, 32, a bypass pipe, 33, and a fifteenth pipeline are arranged;
CWR: cooling return water, CWS: cooling and water feeding, SW: tap water.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a fly ash melting water quenching water-saving system, which comprises a fly ash melting water quenching cooling water closed circulation system and a fly ash melting water quenching steam condensation recovery system;
the closed circulating system of the fly ash melting water quenching cooling water comprises a water quenching pool 1, wherein a water supplementing pipe 16 is arranged above the water quenching pool 1, the water supplementing pipe 16 is communicated with the water quenching pool 1, a water supplementing adjusting valve 10 is arranged on the water supplementing pipe 16, a water quenching pool liquid level meter 9 is arranged on one side of the side wall of the water quenching pool 1, and the water quenching pool liquid level meter 9 is communicated with the side wall of the water quenching pool 1 through a first pipeline 17 and a second pipeline 18; the device also comprises a water quenching circulating pump 2, wherein a liquid inlet of the water quenching circulating pump 2 is communicated with the side wall of the water quenching pool 1 through a third pipeline 19, a liquid outlet of the water quenching circulating pump 2 is connected with a plate heat exchanger 3 through a fourth pipeline 20, and one end part of the fourth pipeline 20 is connected with a water quenching cooling water inlet of the plate heat exchanger 3; a water quenching cooling water outlet of the plate heat exchanger 3 is connected with a fifth pipeline 21, and one end of the fifth pipeline 21 is communicated with the water quenching tank 1 and used for discharging cooled water quenching cooling water into the water quenching tank 1; the slag overflows to a water quenching pool 1 from the outlet of the melting furnace by gravity, the temperature of water quenching cooling water is raised to 80 ℃ of design temperature, then the water quenching cooling water is sent to a plate heat exchanger 3 through a water quenching circulating pump 2 to exchange heat with circulating cooling water for cooling, the temperature of the water quenching cooling water is lowered to 50 ℃, and finally the water quenching cooling water returns to the water quenching pool 1.
The fly ash melting water quenching steam condensation recovery system comprises a condensate tank 7 and a gas collecting hood 4 arranged above a water quenching tank 1, wherein the gas collecting hood 4 is connected with an induced draft fan 5 through an eighth pipeline 24, the induced draft fan 5 is also connected with a steam condenser 6 through a ninth pipeline 25, and a condensate outlet of the steam condenser 6 is communicated with the top wall of the condensate tank 7 through a tenth pipeline 26; a condensate tank liquid level meter 12 is further arranged on one side of the side wall of the condensate tank 7, and the condensate tank liquid level meter 12 is communicated with the side wall of the condensate tank 7 through a thirteenth pipeline 29 and a fourteenth pipeline 30; the device is characterized by further comprising a condensate conveying pump 8, wherein a liquid inlet of the condensate conveying pump 8 is communicated with the side wall of the condensate tank 7 through a twelfth pipeline 28, and a liquid outlet of the condensate conveying pump 8 is communicated with the water quenching tank 1 through an eleventh pipeline 27.
The slag overflows to a water quenching tank 1 from an outlet of a melting furnace by gravity, steam is generated on the liquid surface of the water quenching tank 1 and is collected by a gas collecting hood 4, then a draught fan 5 is used for carrying out negative pressure feeding to a steam condenser 6, the steam is subjected to heat exchange and condensation with circulating cooling water, then condensate flows to a condensate tank by gravity for collection, and a section of U-shaped liquid seal pipe 13 is arranged between the steam condenser 6 and the condensate tank 7 and can prevent air in steam condensate from entering a condensate pipe. And finally, conveying the condensate in the condensate tank 7 to the water quenching tank 1 through a condensate conveying pump 8.
The tenth pipe 26 is provided with a U-shaped liquid seal pipe 13 which functions as a water passage and air blocking pipe.
Ball valves are arranged on the first pipeline 17, the second pipeline 18, the third pipeline 19, the fourth pipeline 20, the eleventh pipeline 27, the twelfth pipeline 28, the thirteenth pipeline 29 and the fourteenth pipeline 30;
a circulating cooling water inlet of the plate heat exchanger 3 is connected with a sixth pipeline 22, and a plate heat exchanger cold water valve 14 is arranged on the sixth pipeline 22; a circulating cooling water inlet of the plate heat exchanger 3 is connected with a seventh pipeline 23, and a valve is arranged on the seventh pipeline 23; a cooling water inlet of the steam condenser 6 is connected with a fifteenth pipeline 33, the fifteenth pipeline 33 is provided with a cold water valve 15 of the steam condenser, a cooling water outlet of the steam condenser 6 is connected with a sixteenth pipeline 31, and the sixteenth pipeline 31 is provided with a valve. The valves on the sixth pipeline 22, the seventh pipeline 23, the sixteenth pipeline 31 and the fifteenth pipeline 33 are all ball valves.
Butterfly valves are arranged on the eighth pipeline 24 and the ninth pipeline 25.
The partial water replenishing pipes 16 on the two sides of the water replenishing regulating valve 10 are also communicated through a bypass pipe 32; two ball valves are respectively arranged on two sides of the water replenishing regulating valve 10, and each ball valve is positioned on the water replenishing pipe 16 between the end part of the bypass pipe 32 and the water replenishing regulating valve 10; the bypass pipe 32 is also provided with a stop valve; a drain pipe is also arranged on the water replenishing pipe 16 between one of the ball valves and the water replenishing regulating valve 10, and a ball valve is arranged on the drain pipe.
A thermometer 11 is also arranged on the side wall of the water quenching tank 1.
An overflow port is arranged on the side wall of the condensate tank 7; the top wall of the condensate tank 7 is provided with a vent hole.
The water replenishing regulating valve 10 is a pneumatic valve; the water quenching tank liquid level meter 9 and the condensate tank liquid level meter 12 are magnetic turning plate type liquid level meters.
The invention also provides a water-saving method for fly ash fusion water quenching, which adopts the system, as shown in figure 1, and is implemented according to the following steps:
the first step is as follows: 1 water supplement of water quenching tank
Opening the water replenishing regulating valve 10, starting water replenishing of the water quenching tank 1, and closing the water replenishing regulating valve 10 when the liquid level value displayed by the liquid level meter 9 of the water quenching tank reaches 80% of the highest liquid level;
then, the liquid level meter 9 and the water replenishing regulating valve 10 of the water quenching tank are both connected with a PLC control system and are used in a linkage control mode; linkage control content:
when the liquid level meter 9 of the water quenching tank is 30% lower than the highest liquid level, the liquid level meter 9 of the water quenching tank gives an alarm at a low position, and simultaneously, the water replenishing regulating valve 10 is controlled to be automatically opened to start replenishing water to the water quenching tank 1; when the liquid level meter 9 of the water quenching tank is higher than 80% of the highest liquid level, the water supplementing regulating valve 10 is automatically closed;
the second step is that: steam condenser 6 for use
Opening a cooling water inlet and outlet valve 15 of the steam condenser 6 to ensure that the cooling water circulates normally;
the third step: the draught fan 5 is put into use
Opening a valve on an eighth pipeline 24 connected with the inlet of the induced draft fan 5, starting the induced draft fan 5, and then opening a valve on a ninth pipeline 26 connected with the outlet of the induced draft fan 5;
the fourth step: slag entering a water quenching tank 1
Opening a slag outlet of the melting furnace, and allowing molten slag to enter a water quenching tank 1 for molten slag water quenching;
the fifth step: plate heat exchanger 3 is put into operation
When the temperature of cooling water in the water quenching tank 1 rises to 80 ℃, a circulating cooling water inlet and outlet valve 14 at the cold end of the plate heat exchanger 3 is opened;
and a sixth step: water quenching circulating pump 2
After the fifth step of operation, opening a valve on a third pipeline 19 at the inlet of the water quenching circulating pump 2, starting the water quenching circulating pump 2, and then opening a valve on a fourth pipeline 20 at the outlet of the water quenching circulating pump 2, wherein water quenching cooling water starts closed cooling circulation, 80 ℃ water quenching cooling water is sent to the plate heat exchanger 3 through the water quenching circulating pump 2, and after heat exchange with circulating cooling water, the water quenching cooling water is cooled to 50 ℃ and then returns to the water quenching pool 1;
then, the liquid level meter 9 of the water quenching pool and the water quenching circulating pump 2 are both connected with a PLC control system and are used in a linkage control mode;
linkage control content:
in the operation process, steam is generated on the cooling water liquid surface of the water quenching tank, the cooling water of the water quenching tank is lost, the liquid level of the water quenching tank is reduced, when the liquid level meter 9 of the water quenching tank is lower than the highest liquid level by 20 percent, the liquid level meter 9 of the water quenching tank alarms at a low position, and meanwhile, the water quenching circulating pump 2 automatically stops operating; the control scheme aims to prevent air from being sucked into the pump to cause a pump cavitation phenomenon and protect the water quenching circulating pump 2 when the liquid level of the water quenching pool 1 is too low.
The seventh step: the condensate tank 7 is put into use
Steam generated by the water quenching pool 1 is fed to the steam condenser 6 under the negative pressure of the draught fan 5 to exchange heat with circulating cooling water of the steam condenser 6, steam condensate in a condensate pipeline of the steam condenser 6 is accumulated continuously, and when the static pressure of the condensate in the condensate pipeline of the steam condenser 6 exceeds the static pressure of the condensate in the U-shaped liquid seal pipe 13, the condensate flows to the condensate tank 7 through the tenth pipeline 26; the design liquid seal pressure of the U-shaped liquid seal pipe 13 is 100Pa higher than the outlet pressure of the induced draft fan 5;
eighth step: the condensate delivery pump 8 is put into use
When the condensate tank liquid level meter 12 reaches 80% of the highest liquid level, the condensate tank liquid level meter 12 gives an alarm at a high position, meanwhile, a valve on the twelfth pipeline 28 is opened, the condensate delivery pump 8 is started, a valve on the eleventh pipeline 27 is opened, and steam condensate in the condensate tank 7 is delivered to the water quenching tank 1; meanwhile, the condensate tank liquid level meter 12 and the condensate conveying pump 8 are both connected with the PLC control system and are used in a linkage control mode;
linkage control content:
when the condensate tank liquid level meter 12 reaches the maximum liquid level of 30%, the condensate tank liquid level meter 12 starts low-level alarm; when condensate tank level gauge 12 reached the highest liquid level 20%, condensate tank level gauge 12 began low level to report an emergency and ask for help or increased vigilance, and condensate delivery pump 8 automatic shutdown was simultaneously, and this control scheme purpose is when condensate tank 7 liquid level is too low, prevents that the air from being inhaled in the pump, arouses pump cavitation phenomenon, protection condensate delivery pump 8.
The system of the invention solves three problems: when the slag enters a water tank for water quenching, the temperature of water quenching cooling water is increased from normal temperature to 95-100 ℃, after the temperature of the water quenching cooling water is increased, the quenching cooling rate of the slag is reduced, the cooling time is prolonged, and when the slag is a solid product, the glass phase content and heavy metal leaching indexes of the product are influenced; a large amount of steam is generated above the water quenching tank, and the steam can scald nearby operators and can damage nearby electrical equipment and cables; and thirdly, a large amount of cooling water is consumed during slag water quenching, and the water quenching cooling water closed circulation saves water consumption in the water quenching process.
Claims (9)
1. A fly ash melting water quenching water-saving system is characterized by comprising a fly ash melting water quenching cooling water closed circulation system and a fly ash melting water quenching steam condensation recovery system;
the closed circulating system for the fly ash melting water quenching cooling water comprises a water quenching pool (1), wherein a water supplementing pipe (16) is arranged above the water quenching pool (1), the water supplementing pipe (16) is communicated with the water quenching pool (1), a water supplementing adjusting valve (10) is arranged on the water supplementing pipe (16), a water quenching pool liquid level meter (9) is arranged on one side of the side wall of the water quenching pool (1), and the water quenching pool liquid level meter (9) is communicated with the side wall of the water quenching pool (1) through a first pipeline (17) and a second pipeline (18); the device is characterized by also comprising a water quenching circulating pump (2), wherein a liquid inlet of the water quenching circulating pump (2) is communicated with the side wall of the water quenching pool (1) through a third pipeline (19), a liquid outlet of the water quenching circulating pump (2) is connected with the plate heat exchanger (3) through a fourth pipeline (20), and one end part of the fourth pipeline (20) is connected with a water quenching cooling water inlet of the plate heat exchanger (3); a water quenching cooling water outlet of the plate heat exchanger (3) is connected with a fifth pipeline (21), and one end of the fifth pipeline (21) is communicated with the water quenching pool (1);
the fly ash melting water quenching steam condensation recovery system comprises a condensate tank (7) and a gas collecting hood (4) arranged above the water quenching tank (1), wherein the gas collecting hood (4) is connected with an induced draft fan (5) through an eighth pipeline (24), the induced draft fan (5) is also connected with a steam condenser (6) through a ninth pipeline (25), and a condensate outlet of the steam condenser (6) is communicated with the top wall of the condensate tank (7) through a tenth pipeline (26); a condensate tank liquid level meter (12) is further arranged on one side of the side wall of the condensate tank (7), and the condensate tank liquid level meter (12) is communicated with the side wall of the condensate tank (7) through a thirteenth pipeline (29) and a fourteenth pipeline (30); the device is characterized by further comprising a condensate conveying pump (8), wherein a liquid inlet of the condensate conveying pump (8) is communicated with the side wall of the condensate tank (7) through a twelfth pipeline (28), and a liquid outlet of the condensate conveying pump (8) is communicated with the water quenching tank (1) through an eleventh pipeline (27).
2. A fly ash molten water quenching water saving system according to claim 1, wherein the tenth pipe (26) is provided with a U-shaped liquid seal pipe (13).
3. A fly ash molten water quenching water saving system according to claim 1, wherein ball valves are arranged on the first pipeline (17), the second pipeline (18), the third pipeline (19), the fourth pipeline (20), the eleventh pipeline (27), the twelfth pipeline (28), the thirteenth pipeline (29) and the fourteenth pipeline (30).
4. A fly ash molten water quenching water saving system as claimed in claim 1, wherein a circulating cooling water inlet of the plate heat exchanger (3) is connected with a sixth pipeline (22), and a plate heat exchanger cold water valve (14) is arranged on the sixth pipeline (22); a circulating cooling water inlet of the plate heat exchanger (3) is connected with a seventh pipeline (23), and a valve is arranged on the seventh pipeline (23); a cooling water inlet of the steam condenser (6) is connected with a fifteenth pipeline (33), a cold water valve (15) of the steam condenser is arranged on the fifteenth pipeline (33), a cooling water outlet of the steam condenser (6) is connected with a sixteenth pipeline (31), and a valve is arranged on the sixteenth pipeline (31).
5. A fly ash molten water quenching water saving system according to claim 1, wherein butterfly valves are arranged on the eighth pipeline (24) and the ninth pipeline (25).
6. A fly ash melting water quenching water saving system as claimed in claim 1, wherein, the partial water replenishing pipes (16) at two sides of the water replenishing regulating valve (10) are also communicated through a bypass pipe (32); two sides of the water replenishing regulating valve (10) are respectively provided with a ball valve, and each ball valve is positioned on the water replenishing pipe (16) between the end part of the bypass pipe (32) and the water replenishing regulating valve (10); a stop valve is also arranged on the bypass pipe (32); a drain pipe is also arranged on the water replenishing pipe (16) between one of the ball valves and the water replenishing regulating valve (10), and the drain pipe is provided with the ball valve.
7. A fly ash molten water quenching water saving system according to claim 1, wherein a thermometer (11) is further installed on the side wall of the water quenching tank (1).
8. A fly ash molten water quenching water saving system according to claim 1, characterized in that the side wall of the condensate tank (7) is provided with an overflow port; the top wall of the condensate tank (7) is provided with a vent hole.
9. A water-saving method for fly ash melt water quenching, which adopts the system as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps:
the first step is as follows: water is supplemented to the water quenching tank (1)
Opening a water replenishing regulating valve (10), starting water replenishing of the water quenching tank (1), and closing the water replenishing regulating valve (10) when a liquid level meter (9) of the water quenching tank displays that the liquid level value reaches 80% of the highest liquid level;
then, a liquid level meter (9) and a water replenishing regulating valve (10) of the water quenching tank are connected with a PLC control system and are used in a linkage control mode; linkage control content:
when the liquid level meter (9) of the water quenching tank is 30% lower than the highest liquid level, the liquid level meter (9) of the water quenching tank alarms at a low position, and meanwhile, the water replenishing regulating valve (10) is controlled to be automatically opened to start replenishing water to the water quenching tank (1); when the liquid level meter (9) of the water quenching tank is higher than 80% of the highest liquid level, the water replenishing regulating valve (10) is automatically closed;
the second step is that: steam condenser (6) for use
Opening a cooling water inlet and outlet valve (15) of the steam condenser (6) to ensure that the cooling water circulates normally;
the third step: the induced draft fan (5) is put into use
Opening a valve on an eighth pipeline (24) connected with an inlet of the induced draft fan (5), starting the induced draft fan (5), and then opening a valve on a ninth pipeline (26) connected with an outlet of the induced draft fan (5);
the fourth step: slag is fed into a water quenching tank (1)
Opening a slag outlet of the melting furnace, and allowing the molten slag to enter a water quenching tank (1) for molten slag water quenching;
the fifth step: the plate heat exchanger (3) is put into use
When the temperature of cooling water in the water quenching tank (1) rises to 80 ℃, a circulating cooling water inlet and outlet valve (14) is opened;
and a sixth step: the water quenching circulating pump (2) is put into use
After the fifth step of operation is finished, a valve on a third pipeline (19) at the inlet of the water quenching circulating pump (2) is opened, the water quenching circulating pump (2) is started, then a valve on a fourth pipeline (20) at the outlet of the water quenching circulating pump (2) is opened, at the moment, water quenching cooling water starts closed cooling circulation, water quenching cooling water at the temperature of 80 ℃ is sent to a plate heat exchanger (3) through the water quenching circulating pump (2), and after heat exchange with the circulating cooling water, the water quenching cooling water is cooled to 50 ℃ and then returns to the water quenching pool (1);
then, the liquid level meter (9) of the water quenching pool and the water quenching circulating pump (2) are both connected with the PLC control system and are used in a linkage control mode;
linkage control content:
in the operation process, when the liquid level meter (9) of the water quenching tank is lower than the highest liquid level by 20%, the liquid level meter (9) of the water quenching tank alarms at a low position, and meanwhile, the water quenching circulating pump (2) automatically stops operating;
the seventh step: the condensate tank (7) is put into use
When the static pressure of the condensate in the condensate pipeline of the steam condenser (6) exceeds the static pressure of the water stored in the U-shaped liquid seal pipe (13), the condensate flows to the condensate tank (7) through a tenth pipeline (26);
eighth step: the condensate delivery pump (8) is put into use
When the condensate tank liquid level meter (12) reaches 80% of the highest liquid level, the condensate tank liquid level meter (12) gives a high-level alarm, meanwhile, a valve on a twelfth pipeline (28) is opened, a condensate delivery pump (8) is started, a valve on an eleventh pipeline (27) is opened, and steam condensate in the condensate tank (7) is delivered to the water quenching tank (1); meanwhile, a condensate tank liquid level meter (12) and a condensate conveying pump (8) are connected with a PLC control system and are used in a linkage control mode;
linkage control content:
when the condensate tank liquid level meter (12) reaches the maximum liquid level of 30%, the condensate tank liquid level meter (12) starts low-level alarm; when the condensate tank liquid level meter (12) reaches the maximum liquid level of 20%, the condensate tank liquid level meter (12) starts low-level alarm, and meanwhile, the condensate conveying pump (8) stops running automatically.
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Application publication date: 20210611 |