CN112146115A - System and method for washing external heating surface of boiler by recycling slag water of coal-fired power plant - Google Patents
System and method for washing external heating surface of boiler by recycling slag water of coal-fired power plant Download PDFInfo
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- CN112146115A CN112146115A CN202010759775.2A CN202010759775A CN112146115A CN 112146115 A CN112146115 A CN 112146115A CN 202010759775 A CN202010759775 A CN 202010759775A CN 112146115 A CN112146115 A CN 112146115A
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- slag
- water
- automatic valve
- boiler
- remover
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- 239000002893 slag Substances 0.000 title claims abstract description 164
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 238000005406 washing Methods 0.000 title claims abstract description 37
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 238000004064 recycling Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000008235 industrial water Substances 0.000 claims abstract description 25
- 238000011010 flushing procedure Methods 0.000 claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 17
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002351 wastewater Substances 0.000 abstract description 4
- 239000002002 slurry Substances 0.000 description 3
- 238000011001 backwashing Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention relates to a system and a method for washing the external heating surface of a boiler by recycling slag water of a coal-fired power plant, belonging to the field of water circulation treatment. The system comprises a high-pressure spray gun, a hose, a slag pool, a boiler hearth, an automatic valve I, an automatic valve II, an automatic valve III, a slag water booster pump and a slag remover, wherein the boiler hearth is communicated with the slag pool, the boiler hearth is arranged at the upper part of the slag pool, slag water in the slag pool is conveyed to an inlet of the slag remover through the slag water booster pump, and the slag water is treated by the slag remover and then is conveyed to a ditch through the automatic valve I; the slag water in the slag pool is conveyed to the inlet of the slag remover through the slag water booster pump, and the slag water is treated by the slag remover, passes through the automatic valve II and is connected with the high-pressure spray gun through the hose; the industrial water is connected with the high-pressure spray gun through the automatic valve III and the hose; the backwash water of the slag separator is discharged into the ditch. The system provided by the invention can be used for treating and reusing slag water after boosting the pressure of the slag water through the slag remover, realizes cyclic utilization of the slag water and wastewater, is environment-friendly and energy-saving, has a stable and reliable flushing effect, and meets the use requirements.
Description
Technical Field
The invention relates to a system and a method, in particular to a system and a method for washing the external heating surface of a boiler by recycling slag water of a coal-fired power plant.
Background
The external heated surface of the boiler can be washed by the thermal power generation coal-fired unit during overhaul, the washing water source is field industrial water, and a hose and a high-pressure water gun are adopted for washing. When the mode of slagging-off was wet slagging-off, the sparge water can collect the slag bath, discharges or collects the industrial waste water pond with the slag water through the slag bath overflow and handles, has all caused great pressure to external environment and industrial waste water processing system.
The invention discloses an invention patent named as 'slag-water recycling system and method of a wet slag removal system' in Chinese patent with publication number CN110131702A, publication number of 2019, 08 and 16. The device comprises a slurry tank, a descaling reactor, a first heat exchanger, a boiler make-up water source and a boiler make-up water system; the outlet of the slurry tank is communicated with the inlet of the descaling reactor, the outlet of the descaling reactor is communicated with the heat-releasing side inlet of the first heat exchanger, the heat-releasing side outlet of the first heat exchanger is communicated with the slurry tank, the outlet of the boiler make-up water source is communicated with the heat-absorbing side inlet of the first heat exchanger, and the heat-absorbing side outlet of the first heat exchanger is communicated with the boiler make-up water system, although the system and the method can avoid the influence of slag water scaling on the heat exchanger and simultaneously realize the recovery of the heat of the slag water; but are not suitable for washing external heating surfaces of boilers and do not achieve the desired washing effect.
Because the external heating surface of the boiler is dirty, clean industrial water can not be adopted for washing completely, the slag water can be used for washing the external heating surface of the boiler after being simply treated, and the washing water can wash impurities on the external heating surface of the boiler and finally is collected into the slag pool again.
Therefore, a set of slag water treatment device is provided, the qualified slag water is used for washing the external heating surface of the boiler, the industrial water consumption is reduced, and the discharge of washing water is reduced, which is particularly necessary.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a system and a method for washing the external heating surface of the boiler by recycling slag water of a coal-fired power plant, which have the advantages of reasonable system design, realization of recycling of the slag water and wastewater, environmental protection, energy conservation, stable and reliable washing effect and are used after the slag water is subjected to pressure boosting and is treated by a slag remover.
The technical scheme adopted by the invention for solving the problems is as follows: this coal fired power plant slag water cyclic utilization washes boiler outside heating surface system, including high-pressure spray gun, hose, slag bath, boiler furnace, ditch and industrial water, boiler furnace and slag bath intercommunication, this boiler furnace sets up on slag bath upper portion, and high-pressure spray gun links to each other its characterized in that with the hose: the slag water in the slag pool is conveyed to an inlet of the slag remover through the slag water booster pump, and is treated by the slag remover and then flows to a ditch through the automatic valve I; the slag water in the slag pool is conveyed to the inlet of the slag remover through the slag water booster pump, and the slag water is treated by the slag remover, passes through the automatic valve II and is connected with the high-pressure spray gun through the hose; the industrial water is connected with the high-pressure spray gun through the automatic valve III and the hose; the backwash water of the slag separator is discharged into the ditch.
Preferably, the invention also comprises a filter screen which is arranged in the slag pool.
Preferably, the invention also comprises a pressure difference meter which is arranged on two sides of the slag remover.
Preferably, the invention also comprises a liquid level meter which is arranged on the slag pool.
Preferably, the invention also comprises a turbidity meter which is arranged at the rear end of the automatic valve II.
The invention also provides a method for washing the external heating surface of the boiler by recycling the slag water of the coal-fired power plant, which is characterized by comprising the following steps: the method comprises the following steps:
(S1) opening the slag water booster pump, opening the automatic valve I, closing the automatic valve II and the automatic valve III, and discharging the unqualified produced water of the slag remover into a ditch;
(S2) after the slag water booster pump operates stably, the automatic valve II is opened, the automatic valve I and the automatic valve III are closed, and water produced by the slag remover (10) is used as flushing water to flush the external heating surface of the boiler;
(S3) according to the pressure difference meter, when the pressure difference of the slag separator reaches the set value, the slag separator backflushs, and the backflushing water is discharged into the ditch;
(S4) when the slag separator or the slag water booster pump fails, the automatic valve II is closed, the automatic valve III is opened, and the industrial water is automatically switched to continuously flush the external heating surface of the boiler.
Compared with the prior art, the invention has the following advantages and effects: the whole system is reasonable in design, the external heating surface of the boiler is washed by using slag water, and the consumption of industrial water is saved; the slag water can be recycled, so that the discharge amount of the washing wastewater is reduced, and the environmental protection risk of enterprises is reduced; the slag water booster pump is arranged, so that the pressure of washing water is higher and more stable, and the washing effect is better; the slag remover is provided with a pressure difference meter, when the pressure difference of the inlet and the outlet of the slag remover reaches a set value, the slag remover automatically carries out backwashing, and backwashing water of the slag remover is discharged into the slag pool.
Drawings
FIG. 1 is a schematic diagram of the external heated surface washing of a prior art boiler.
Fig. 2 is a schematic diagram of an operation structure of the embodiment of the present invention.
In the figure: the automatic slag-removing device comprises an automatic valve I1, an automatic valve II 2, an automatic valve III 3, a high-pressure spray gun 4, a hose 5, a liquid level meter 6, a filter screen 7, a slag water booster pump 8, a pressure difference meter 9, a slag remover 10, a turbidity meter 11, a slag pool 12, a boiler furnace 13, a ditch 14 and industrial water 15.
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.
Examples are given.
Referring to fig. 2, the system for circularly utilizing slag water to flush the external heating surface of the boiler in the coal-fired power plant mainly comprises a first automatic valve 1, a second automatic valve 2, a third automatic valve 3, a high-pressure spray gun 4, a slag water booster pump 8, a slag remover 10, a slag pool 12 and a boiler furnace 13, wherein the boiler furnace 13 is communicated with the slag pool 12, the boiler furnace 13 is arranged at the upper part of the slag pool 12, the high-pressure spray gun 4 is connected with a hose 5, the slag water in the slag pool 12 is conveyed to an inlet of the slag remover 10 through the slag water booster pump 8, and the slag water is treated by the slag remover 10 and then flows through the first automatic valve 1 to a water channel 14; slag water in the slag pool 12 is conveyed to an inlet of a slag remover 10 through a slag water booster pump 8, and the slag water is treated through the slag remover 10, passes through an automatic valve II 2 and is connected with a high-pressure spray gun 4 through a hose 5; the industrial water 15 passes through the automatic valve III 3 and is connected with the high-pressure spray gun 4 through the hose 5; backwash water from the cleaner 10 drains into the gutter 14.
The filter screen 7 of the embodiment is arranged in the slag pool 12; the differential pressure gauge 9 is arranged at two sides of the slag remover 10; the liquid level meter 6 is arranged on the slag pool 12; the turbidity meter 11 is arranged at the rear end of the automatic valve II 2.
The slag water treatment method for washing the external heating surface of the boiler by recycling the slag water of the coal-fired power plant comprises the following steps:
(S1) the slag water booster pump 8 is started, the automatic valve I1 is started, the automatic valve II 2 and the automatic valve III 3 are closed, and unqualified slag separators 10 produce water and discharge the water into the ditch 14.
(S2) after the slag water booster pump 8 operates stably, the automatic valve II 2 is opened, the automatic valve I1 and the automatic valve III 3 are closed, and water produced by the slag remover 10 is used as flushing water to flush the external heating surface of the boiler.
(S3) according to the pressure difference meter 9, when the pressure difference of the slag remover 10 reaches the set value, the slag remover 10 backwashes and the backwash water is discharged into the ditch 14.
(S4) when the slag separator 10 or the slag water booster pump 8 has a fault, the automatic valve II 2 is closed, the automatic valve III 3 is opened, and the industrial water 15 is automatically switched to continuously flush the external heated surface of the boiler.
Example 1: the capacity of a direct-current cooling water coal-fired unit at the edge of a long river in Hubei is 2 pieces of 350MW and 2 pieces of 680MW, the unit is overhauled every year, industrial water is adopted for washing the external heating surface of a boiler of the overhauled unit every time, and about 1000 m of industrial water is used for washing every time3And after the flushing is finished, all part of water is discharged.
After the system is adopted, slag water is adopted for circularly washing the external heating surface of the boiler during overhaul every time, and the actually consumed washing water amount is 150 m3The purpose of completely not adopting industrial water washing is realized, and the water consumption is reduced by 850 m3。
Example 2: the capacity of a certain coal-fired unit in Hunan province is 4 units of 350MW, the unit is overhauled every year, industrial water is adopted for washing the external heating surface of the boiler of the overhauled unit every time, and about 1100 m of industrial water is used for washing every time3And after the flushing is finished, all part of water is discharged.
After the system is adopted, the external heating surface of the boiler is flushed by adopting slag water circulation every time of overhaul, and the actual consumption of flushing water is 200 m3The purpose of completely not adopting industrial water flushing is realized, and the water consumption is reduced by 900 m3。
In the embodiment, slag water in a slag pool 12 is filtered by a filter screen 7, is subjected to pressure boosting by a slag water booster pump 8 and is conveyed to an inlet of a slag remover 10, and is subjected to washing on the external heating surface of a boiler by a hose 5 and a high-pressure spray gun 4 after being treated by the slag remover 10; the washing water is finally collected to the slag pool 12 by utilizing the structure of the boiler, so that the slag water is filtered, subjected to slag removal and pressure boosting treatment and recycled, and is used for washing the external heating surface of the boiler when the unit is stopped for maintenance.
The flushing water for flushing the external heating surface of the boiler can be collected to the slag pool 12 of the unit again through the self structure of the boiler, so that the flushing water is not discharged outside, and the purposes of recycling slag water and saving water are achieved.
The embodiment replaces the traditional mode of flushing the external heating surface of the boiler by using industrial water, realizes the reutilization of slag water and waste water, and reduces the consumption of industrial water.
Compared with the original industrial water flushing system, the slag remover 10 and the slag water booster pump 8 are arranged in the embodiment, so that the flushing pressure is effectively improved, and the flushing effect is improved; automatic control systems such as a remote transmission type liquid level meter 6 and an automatic valve are arranged, so that low liquid level alarming and system automatic protection functions can be realized.
The embodiment does not cut off the industrial water source, and when the system breaks down, the automatic switching back to the industrial water flushing function can be realized to ensure that the flushing is continued.
And will be apparent to those skilled in the art from the foregoing description.
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 (6)
1. The utility model provides a coal fired power plant slag water cyclic utilization washes boiler outside heating surface system, includes high-pressure spray gun (4), hose (5), slag bath (12), boiler furnace (13), ditch (14) and industrial water (15), boiler furnace (13) and slag bath (12) intercommunication, this boiler furnace (13) set up on slag bath (12) upper portion, and high-pressure spray gun (4) link to each other its characterized in that with hose (5): the slag water treatment system is characterized by further comprising an automatic valve I (1), an automatic valve II (2), an automatic valve III (3), a slag water booster pump (8) and a slag remover (10), wherein the slag water in the slag pool (12) is conveyed to an inlet of the slag remover (10) through the slag water booster pump (8), and is treated by the slag remover (10) and then flows to a ditch (14) through the automatic valve I (1); slag water in the slag pool (12) is conveyed to an inlet of a slag remover (10) through a slag water booster pump (8), and the slag water is treated by the slag remover (10), passes through an automatic valve II (2) and is connected with a high-pressure spray gun (4) through a hose (5); industrial water (15) passes through the automatic valve III (3) and is connected with the high-pressure spray gun (4) through the hose (5); backwash water of the slag separator (10) is discharged into the gutter (14).
2. The system for recycling and washing the external heating surface of the boiler by using the slag water of the coal-fired power plant as claimed in claim 1, is characterized in that: the slag bath device further comprises a filter screen (7), wherein the filter screen (7) is arranged in the slag bath (12).
3. The system for recycling and washing the external heating surface of the boiler by using the slag water of the coal-fired power plant as claimed in claim 1, is characterized in that: the slag remover further comprises a pressure difference meter (9), wherein the pressure difference meter (9) is arranged on two sides of the slag remover (10).
4. The system for recycling and washing the external heating surface of the boiler by using the slag water of the coal-fired power plant as claimed in claim 1, is characterized in that: the slag bath device is characterized by further comprising a liquid level meter (6), wherein the liquid level meter (6) is arranged on the slag bath (12).
5. The system for recycling and washing the external heating surface of the boiler by using the slag water of the coal-fired power plant as claimed in claim 1, is characterized in that: the automatic valve device further comprises a turbidity meter (11), wherein the turbidity meter (11) is arranged at the rear end of the automatic valve II (2).
6. A method for washing the external heating surface of a boiler by recycling slag water of a coal-fired power plant, which adopts the system for washing the external heating surface of the boiler by recycling slag water of the coal-fired power plant as claimed in any one of claims 1 to 5, and is characterized in that: the method comprises the following steps:
(S1) opening the slag water booster pump (8), opening the automatic valve I (1), closing the automatic valve II (2) and the automatic valve III (3), and discharging unqualified produced water of the slag remover (10) into a ditch (14);
(S2) after the slag water booster pump (8) operates stably, the automatic valve II (2) is opened, the automatic valve I (1) and the automatic valve III (3) are closed, and water produced by the slag remover (10) is used as flushing water to flush the external heating surface of the boiler;
(S3) according to the pressure difference meter (9), when the pressure difference of the slag separator (10) reaches a set value, the slag separator (10) is backwashed, and the backwash water is discharged into the ditch (14);
(S4) when the slag remover (10) or the slag water booster pump (8) is in fault, the automatic valve II (2) is closed, the automatic valve III (3) is opened, and the industrial water (15) is automatically switched to continuously flush the external heated surface of the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010759775.2A CN112146115A (en) | 2020-07-31 | 2020-07-31 | System and method for washing external heating surface of boiler by recycling slag water of coal-fired power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010759775.2A CN112146115A (en) | 2020-07-31 | 2020-07-31 | System and method for washing external heating surface of boiler by recycling slag water of coal-fired power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112146115A true CN112146115A (en) | 2020-12-29 |
Family
ID=73887763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010759775.2A Pending CN112146115A (en) | 2020-07-31 | 2020-07-31 | System and method for washing external heating surface of boiler by recycling slag water of coal-fired power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112146115A (en) |
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2020
- 2020-07-31 CN CN202010759775.2A patent/CN112146115A/en active Pending
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