CN114988119A - Pneumatic conveying system and method suitable for evaporating high-salinity ash from desulfurization wastewater bypass flue gas of thermal power plant - Google Patents
Pneumatic conveying system and method suitable for evaporating high-salinity ash from desulfurization wastewater bypass flue gas of thermal power plant Download PDFInfo
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- CN114988119A CN114988119A CN202210675927.XA CN202210675927A CN114988119A CN 114988119 A CN114988119 A CN 114988119A CN 202210675927 A CN202210675927 A CN 202210675927A CN 114988119 A CN114988119 A CN 114988119A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/52—Adaptations of pipes or tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/52—Adaptations of pipes or tubes
- B65G53/521—Adaptations of pipes or tubes means for preventing the accumulation or for removal of deposits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention discloses a pneumatic conveying system and method suitable for evaporating high-salinity ash from desulfurization waste water bypass flue gas of a thermal power plant, which comprises an ash hopper, a bin pump, a blanking pipe, a balance pipe, a back flushing pipeline, a back flushing valve and a compressed air source, wherein the ash hopper is connected with the bin pump through the blanking pipe; an outlet at the bottom of the ash bucket is communicated with an inlet of the bin pump through a blanking pipe; one end of the balance pipe is communicated with the ash bucket, the other end of the balance pipe is communicated with the top of the bin pump, a drain valve is arranged at a drain outlet at the bottom of the bin pump, an inlet of the back-flushing pipeline is communicated with a compressed air source, and an outlet of the back-flushing pipeline is communicated with the balance pipe through the back-flushing valve.
Description
Technical Field
The invention belongs to the technical field of desulfurization wastewater treatment of a thermal power plant, and relates to a pneumatic conveying system and method suitable for evaporating high-salinity ash from bypass flue gas of desulfurization wastewater of the thermal power plant.
Background
At present, the most common zero-discharge technology of thermal power plant desulfurization wastewater is a bypass flue gas evaporation technology, and the technology is characterized in that a bypass flue gas evaporator is built near a unit denitration steel frame, and desulfurization wastewater is evaporated by hot flue gas led out from a unit denitration outlet flue, so that zero discharge of wastewater is realized. A certain amount of deposited ash is generated at the bottom of the evaporator, and the part of the ash is generally conveyed to an ash storehouse or a slag bin of a power plant through a pneumatic ash conveying device. Because the salt content of the desulfurization wastewater is higher, the desulfurization wastewater can reach 30000-50000 mg/L generally and contains a large amount of SO 4 2- 、Ca 2+ 、Mg 2+ 、Cl - The ions in the desulfurization wastewater after entering the bypass flue gas evaporation system and being evaporated are combined with the fly ash in the flue gas to form a flue gas rich in CaSO 4 、MgSO 4 、MgCl 2 、CaCl 2 The high-salt ash with equal components is easy to absorb moisture, is easy to harden after moisture absorption to cause the jamming of a balance valve, and can cause the abnormal opening and closing of the valve, the blockage of a balance pipe, unsmooth blanking and the like in serious cases. In addition, in the preheating process of the evaporator at the initial starting stage of the system, high temperature flue gas is introduced, so that the temperature of the evaporator is highThe warm flue gas is mixed with the low-temperature flue gas in the tower to generate a certain amount of condensed water. If the partial condensed water is discharged in time, the blockage of an ash hopper blanking pipe, a bin pump and an ash conveying pipeline is easily caused, so that a pneumatic ash conveying system is in failure, and finally the whole desulfurization waste water bypass flue gas evaporation system cannot normally operate.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pneumatic conveying system and a pneumatic conveying method suitable for evaporating high-salinity ash from desulfurization waste water bypass flue gas of a thermal power plant.
In order to achieve the aim, the pneumatic conveying system suitable for evaporating high-salinity ash from the desulfurization waste water bypass flue gas of the thermal power plant comprises an ash hopper, a bin pump, a blanking pipe, a balance pipe, a back-flushing pipeline, a back-flushing valve and a compressed air source;
an outlet at the bottom of the ash bucket is communicated with an inlet of the bin pump through a blanking pipe; one end of the balance pipe is communicated with the ash bucket, the other end of the balance pipe is communicated with the top of the bin pump, a drain valve is arranged at a drain outlet at the bottom of the bin pump, an inlet of the back-blowing pipeline is communicated with a compressed air source, and an outlet of the back-blowing pipeline is communicated with the balance pipe through the back-blowing valve.
The blanking pipe is provided with a manual gate valve.
A blanking valve is arranged on the blanking pipe.
And a temperature measuring point of the blanking pipe is arranged on the blanking pipe.
And the condensed water generated by the bypass flue gas evaporation system due to temperature change in the process of starting preheating is discharged through the drain valve.
And regularly carrying out back flushing on the balance pipe through a back flushing pipeline and a back flushing valve.
And monitoring the temperature of the blanking pipe through a temperature measuring point of the blanking pipe, and judging whether the ash conveying system normally operates or not through the temperature of the blanking pipe.
The pneumatic conveying method suitable for evaporating high-salinity ash from the desulfurization wastewater bypass flue gas of the thermal power plant comprises the following steps of:
and opening the blanking valve, the blow-down valve and the air inlet valve to discharge condensed water in the bypass flue gas evaporation system, and regularly and automatically performing back flushing on the balance pipe through a back flushing pipeline and a back flushing valve.
The invention has the following beneficial effects:
the pneumatic conveying system and the method suitable for evaporating high-salinity ash from the desulfurization waste water bypass flue gas of the thermal power plant are particularly operated, the automatic blowdown valve is arranged at the bottom of the bin pump and used for discharging condensed water generated in the starting process of the system, in addition, the balance pipe is provided with the compressed air back-blowing equipment, the back blowing is carried out on the balance pipe after the ash conveying circulation is carried out for a certain number of times, the probability of blockage of the balance pipe is effectively reduced, the structure is simple, the operation is convenient, the practicability is strong, and the problem that the condensate water of the evaporation tower cannot be discharged to block the ash conveying system in the starting process of the desulfurization waste water bypass flue gas evaporation system and the balance pipe is blocked in the operation process of the bin pump can be effectively prevented.
Drawings
FIG. 1 is a schematic view of the present invention.
Wherein, 1 is a bin pump, 2 is a blanking valve, 3 is a manual gate valve, 4 is an ash bucket, 5 is a balance valve, 6 is a blowback valve, 7 is an air inlet valve, 8 is an accompanying blow valve, 9 is a complementary blow valve, 10 is a discharge valve, and 11 is a blow-off valve.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the pneumatic conveying system suitable for evaporating high-salinity ash from desulfurization waste water bypass flue gas of a thermal power plant comprises a bin pump 1, a blanking valve 2, a manual gate valve 3, an ash bucket 4, a balance valve 5, a blowback valve 6, an air inlet valve 7, an auxiliary blowing valve 8, a complementary blowing valve 9, a discharge valve 10 and a blow-down valve 11;
the bottom outlet of the ash bucket 4 is communicated with the inlet of the bin pump 1 through a blanking pipe, the blanking pipe is provided with a manual gate valve 3 and a blanking valve 2, and the blanking pipe is provided with a temperature measuring point of the blanking pipe.
One end of the balance pipe is communicated with the ash bucket 4, the other end of the balance pipe is communicated with the top of the bin pump 1, a blow-down valve 11 is arranged at a blow-down port at the bottom of the bin pump 1, an outlet of the back-blowing pipeline is communicated with the balance pipe through a back-blowing valve 6, and an inlet of the back-blowing pipeline is communicated with a compressed air source;
when the boiler works, condensed water generated by the bypass flue gas evaporation system due to temperature change in the process of starting and preheating is discharged through the blow-down valve 11, and the blocking of the bin pump 1 is effectively prevented.
The balance pipe is regularly subjected to back flushing through a back flushing pipeline and a back flushing valve 6, so that the blocking probability of the balance pipe is reduced.
And a temperature measuring point of the blanking pipe is arranged at the blanking pipe, the temperature of the blanking pipe is monitored through the temperature measuring point of the blanking pipe, and whether the ash conveying system normally operates or not is judged through the temperature of the blanking pipe.
In the starting process of the desulfurization waste water bypass flue gas evaporation system, the blanking valve 2, the blow-down valve 11 and the air inlet valve 7 are opened under the control of a program so as to discharge condensed water in the system; meanwhile, the back flushing step of the balance pipe can be automatically carried out according to the degree setting.
The pneumatic conveying method suitable for evaporating high-salinity ash from the desulfurization wastewater bypass flue gas of the thermal power plant comprises the following steps of:
opening the blanking valve 2, the blow-off valve 11 and the air inlet valve 7 to discharge condensed water in the system; the balance pipe is regularly and automatically back blown through a back blowing pipeline and a back blowing valve 6.
Example one
2 sets of desulfurization waste water bypass flue gas evaporation systems of certain thermal power factory design, desulfurization waste water bypass flue gas evaporation system normal operating, the dry ash temperature of 4 bottoms in ash bucket is about 100 ~ 150 ℃. Each system is provided with a pneumatic ash conveying device in a matching way, and the conveying capacity of a single set of pneumatic ash conveying device is 2000 kg/h. The balance pipe is provided with a back flushing pipeline and a back flushing valve 6, and the bottom of the bin pump 1 is provided with a blow-down valve 11. At the initial stage of starting the desulfurization waste water bypass flue gas evaporation system, in order to prevent the temperature rise from being too fast, the equipment deformation is too big, a certain temperature rise rate is required to be kept for slowly raising the temperature, in the process of slowly raising the temperature of the evaporator, condensed water is separated out in the evaporator, and the phenomenon is particularly obvious in winter and rainy season in south. In order to prevent condensed water from blocking the bin pump 1 and an ash conveying pipeline after entering the bin pump 1, in the preheating process of the evaporator, firstly, a blanking valve 2 is opened, after the blanking valve 2 is opened in place, time delay is 10s (the time can be set), the blanking valve 2 is closed, after the blanking valve 2 is closed in place, a blowdown valve 11 is opened, after the blowdown valve 11 is opened in place, water drainage is started after time delay is 20s, after the water drainage time is finished, an air inlet valve 7 is opened, the bin pump 1 is blown by compressed air, after the preset time delay, the air inlet valve 7 is closed, and blowdown of the bin pump 1 is continuously finished. In addition, the main component of the ash deposited at the bottom of the desulfurization waste water bypass flue gas evaporation system is CaSO 4 、MgSO 4 、MgCl 2 、CaCl 2 And the salt content of the partial ash is high, the partial ash belongs to high-salt ash and is easy to absorb moisture, so that the ash conveying circulation time of an ash conveying system cannot be too long, and dry ash is prevented from hardening. The circulation interval time is usually 5-15 min. In addition, because the characteristics of the part of ash can easily cause the blockage of the ash conveying balance pipe, the invention is provided with the back-blowing valve 6, after the normal circulation of the ash conveying for a certain number of times, the program can automatically open the back-blowing valve 6 to carry out back-blowing on the balance pipe, and the back-blowing valve can blow in timeThe floating ash remained on the inner wall of the balance pipe is removed, and the problem of blockage of the balance pipe is effectively prevented. In addition, a temperature measuring point of the blanking pipe is additionally arranged at the blanking pipe, so that whether the pneumatic ash conveying system normally operates can be judged more quickly and intuitively.
By adopting the invention, the operation state of the pneumatic ash conveying device at the bottom of the desulfurization waste water bypass flue gas evaporation system can be monitored in real time, condensed water generated in the preheating process of the evaporator can be discharged, the blocking of the bin pump 1 and the ash conveying pipeline is prevented, and the stable operation of the desulfurization waste water bypass flue gas evaporation system is ensured.
The invention has the following characteristics:
the blowoff valve 11 is arranged at the bottom of the bin pump 1, so that condensed water generated by the bypass flue gas evaporator in the starting stage can be discharged out of the system, and the bin pump 1 and the ash conveying pipeline are prevented from being blocked.
The balance pipe is provided with a back flushing pipeline, so that the balance pipe is regularly back flushed, and the risk of blockage of the balance pipe is effectively reduced.
The temperature measuring point of the blanking pipe is arranged at the blanking pipe, so that the temperature of the blanking pipe can be monitored in real time, and an operator can be helped to visually judge whether the operation of the pneumatic ash conveying system is normal.
The back flushing step of the balance pipe can be set by a program and automatically run, the back flushing frequency is set according to the ash conveying cycle time, and the back flushing time can be set every time.
The bin pump ash conveying system automatically operates by controlling parameters such as ash conveying cycle time, blanking time, ash conveying ending pressure and the like.
The invention is suitable for the pneumatic ash conveying system with zero discharge of desulfurization waste water in a thermal power plant; the problem that the bin pump 11 and the ash conveying pipeline are easy to block is effectively solved; the problem that the bin pump 11 and the ash conveying pipeline are blocked because condensed water generated on the wall of the evaporator cannot be discharged in the starting process of the desulfurization waste water bypass flue gas evaporation system is thoroughly solved; the problems of blockage of the balance pipe, jamming of the balance valve 5 and the like are effectively prevented; the automatic stable operation of the back flushing step of the balance pipe is realized, and the automation degree is high; the running state of the ash conveying system can be judged more visually, and full-automatic running and unattended operation can be realized.
Claims (8)
1. A pneumatic conveying system suitable for high-salinity ash evaporated by desulfurization waste water bypass flue gas of a thermal power plant is characterized by comprising an ash hopper (4), a bin pump (1), a blanking pipe, a balance pipe, a back-flushing pipeline, a back-flushing valve (6) and a compressed air source;
an outlet at the bottom of the ash bucket (4) is communicated with an inlet of the bin pump (1) through a blanking pipe; one end of the balance pipe is communicated with the ash bucket (4), the other end of the balance pipe is communicated with the top of the bin pump (1), a sewage discharge valve (11) is arranged at a sewage discharge port at the bottom of the bin pump (1), an inlet of the back flushing pipeline is communicated with a compressed air source, and an outlet of the back flushing pipeline is communicated with the balance pipe through a back flushing valve (6).
2. The pneumatic conveying system suitable for evaporating high-salinity ash from thermal power plant desulfurization wastewater bypass flue gas according to claim 1, characterized in that a manual gate valve (3) is arranged on the blanking pipe.
3. The pneumatic conveying system suitable for evaporating high-salinity ash from thermal power plant desulfurization wastewater bypass flue gas according to claim 2, characterized in that a blanking valve (2) is arranged on the blanking pipe.
4. The pneumatic conveying system suitable for evaporating high-salinity ash from thermal power plant desulfurization wastewater bypass flue gas as recited in claim 1, wherein the blanking pipe is provided with a blanking pipe temperature measuring point.
5. The pneumatic conveying system suitable for evaporating high-salinity ash from thermal power plant desulfurization wastewater bypass flue gas is characterized in that condensate water generated by the bypass flue gas evaporation system due to temperature change in the process of starting preheating is discharged through a blowdown valve (11).
6. The pneumatic conveying system suitable for evaporating high-salt ash from desulfurization waste water bypass flue gas of a thermal power plant as claimed in claim 1, characterized in that the balance pipe is subjected to back flushing periodically through a back flushing pipeline and a back flushing valve (6).
7. The pneumatic conveying system suitable for evaporating high-salinity ash from thermal power plant desulfurization wastewater bypass flue gas as recited in claim 1, wherein the temperature of the blanking pipe is monitored by a temperature measuring point of the blanking pipe, and whether the ash conveying system is in normal operation is judged according to the temperature of the blanking pipe.
8. The pneumatic conveying method for the high-salinity ash evaporated by the desulfurization waste water bypass flue gas of the thermal power plant is characterized in that the pneumatic conveying system for the high-salinity ash evaporated by the desulfurization waste water bypass flue gas of the thermal power plant based on the claim 3 comprises the following steps:
and opening the blanking valve (2), the blow-down valve (11) and the air inlet valve (7) to discharge condensed water in the bypass flue gas evaporation system, and regularly and automatically blowing back the balance pipe through a blowback pipeline and a blowback valve (6).
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| CN202210675927.XA CN114988119A (en) | 2022-06-15 | 2022-06-15 | Pneumatic conveying system and method suitable for evaporating high-salinity ash from desulfurization wastewater bypass flue gas of thermal power plant |
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| CN202210675927.XA CN114988119A (en) | 2022-06-15 | 2022-06-15 | Pneumatic conveying system and method suitable for evaporating high-salinity ash from desulfurization wastewater bypass flue gas of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117302987A (en) * | 2023-11-13 | 2023-12-29 | 大唐环境产业集团股份有限公司 | Pneumatic conveying system and method for evaporating high-salinity ash from concentrated wastewater bypass hot flue gas |
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| CN213010771U (en) * | 2020-08-31 | 2021-04-20 | 天津科林斯凯环保科技有限公司 | Blowing and blocking system of pneumatic powder material conveying device |
| CN113060556A (en) * | 2021-03-15 | 2021-07-02 | 大唐淮南洛河发电厂 | Pneumatic ash removal and blockage removal method |
| CN113292124A (en) * | 2021-06-07 | 2021-08-24 | 浙江天地环保科技股份有限公司 | Ash conveying device and method based on spray drying tower wastewater evaporation treatment technology |
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| CN117302987A (en) * | 2023-11-13 | 2023-12-29 | 大唐环境产业集团股份有限公司 | Pneumatic conveying system and method for evaporating high-salinity ash from concentrated wastewater bypass hot flue gas |
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