CN111810934A - Washing system and washing method for salt accumulation of power station boiler system - Google Patents
Washing system and washing method for salt accumulation of power station boiler system Download PDFInfo
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- CN111810934A CN111810934A CN202010852760.0A CN202010852760A CN111810934A CN 111810934 A CN111810934 A CN 111810934A CN 202010852760 A CN202010852760 A CN 202010852760A CN 111810934 A CN111810934 A CN 111810934A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/52—Washing-out devices
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Abstract
The invention discloses a system and a method for flushing salt accumulated in a power station boiler system, wherein the flushing system comprises a temporary water inlet pipeline for communicating a condensed water pipeline and a low-pressure bypass pipeline of the power station boiler system, and a temporary water inlet valve arranged on the temporary water inlet pipeline; the temporary short connecting pipe is communicated with a reheater system and a superheater system of the power station boiler system; the system comprises a unit drainage tank, a sampling valve, a pressure gauge and a temporary discharge valve, wherein the unit drainage tank is communicated with a lower water packet of a power station boiler system through a temporary discharge pipe; the invention also discloses a flushing method of the system, which is used for controlling the content of the sodium ions in the drainage to be less than 20 mug/L; the system disclosed by the invention is simple and reliable in design and easy to realize, and solves the problems of salt accumulation on the heating surface of the boiler and incapability of normal operation of a unit caused by condenser leakage in a coastal power plant.
Description
Technical Field
The invention belongs to the field of salt accumulation in a boiler water vapor system caused by seawater entering the boiler water vapor system due to leakage of a condenser heat exchange tube, and particularly relates to a washing system and a washing method for the salt accumulation in a power station boiler system.
Background
Once the condenser leaks seawater, the quality of water vapor is deteriorated, and finally salt accumulation in a water vapor system of the boiler is caused, so that a unit cannot normally operate. Especially, when the elbow salt deposition is serious under superheater and the reheat device's "U" type or "W" type heat exchange tube, then need carry out the water washing, in the water washing in-process, final superheater and high temperature reheat ware "W" type heat exchange tube probably take place the gas lock and lead to not circulating in the heat exchange tube, along with the continuous evaporation of ponding in the heat exchange tube in the start-up process like this, can cause the final elbow of dissolving in the heat exchange tube to concentrate under and separate out, there is the risk of jam the elbow under the heat exchange tube, thereby probably lead to the booster. Therefore, under the condition, the small-flow washing of the boiler by the existing conditions has a higher risk, a condensate pump is needed to be utilized, and a certain auxiliary system is designed, so that the large-flow washing of the boiler is realized, the salt content possibly remaining due to air plugs of a boiler superheater system and a boiler reheater system is thoroughly eliminated, and the problem of salt accumulation caused by seawater leakage of the boiler superheater system and the boiler reheater system can be completely solved by using the washing system and the method at present.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a washing system and a washing method for salt accumulation of a power station boiler system, the system is simple in design, reliable and easy to implement, and the problem that a unit cannot normally operate due to salt accumulation of a boiler superheater and a reheater system caused by seawater leakage of a heat exchange tube of a condenser is solved.
In order to achieve the purpose, the invention adopts the following technical scheme,
a washing system for salt deposition of a power station boiler system comprises a temporary water inlet pipeline 8 for communicating a condensed water pipeline 5 and a low-pressure bypass pipeline 6 of the power station boiler system, and a temporary water inlet valve 9 arranged on the temporary water inlet pipeline 8; a temporary short pipe 13 for connecting the reheater system 10 and the superheater system 14 of the utility boiler system; a unit drainage tank 22 communicated with a lower water drum 17 of the utility boiler system through a temporary drainage pipe 18, and a sampling valve 19, a pressure gauge 20 and a temporary drainage valve 21 arranged on the unit drainage tank 22; the condenser 1 → the condensate pump 2 → the condensate pipe 5 → the temporary water inlet pipe 8 → the temporary water inlet valve 9 → the reheater system 10 → the high side pipe 11, the high side valve 12 and the temporary short pipe 13 → the superheater system 14 → the steam drum 15 → the water wall 16 → the drain drum 17 → the temporary discharge pipe 18 → the temporary discharge valve 21 → the unit drain tank 22 forms a reverse flushing circuit.
And a temporary plugging plate 7 is arranged at the communication part of the temporary water inlet pipeline 8 and the low-pressure bypass pipeline 6 for plugging.
The pH value of system flushing water is adjusted by means of a condensed water ammonia adding point in a power station boiler system, the flushing water is heated by means of four-section steam extraction in the power station boiler system, the temperature of the flushing water is increased, and a temporary dosing system and a temporary heating system do not need to be connected.
According to the method for flushing the salt accumulation flushing system of the power station boiler system, a condenser 1 of the power station boiler system is replenished with water to a high liquid level, a first condensate pump 2-1 is started to replenish water to a deaerator 4, the flow of the replenished water is regulated through a condensate self-circulation valve 3, the internal circulation of the deaerator 4 and the condenser 1 is established, the pH value of the water is regulated to be larger than 10.0 through adding ammonia, the deaerator 4 is heated, heating is stopped when the temperature of the water reaches 50-70 ℃, exhaust valves of a reheater system 10, a superheater system 14, a steam drum 15 and a water cooling wall 16 are opened in sequence, a temporary water inlet valve 9 is gradually opened, water is slowly supplied to the power station boiler system, an exhaust valve is closed in sequence when the exhaust valves of the reheater system 10, the superheater system 14, the steam drum 15 and the water cooling wall 16 all have continuous water flow, a sampling valve 19 and a temporary water inlet valve 9 are gradually opened when the reading of a pressure gauge, closing the condensate self-circulation valve 3, starting a second condensate pump 2-2 (frequency conversion regulation) at the same time, and carrying out large-flow water washing on a reheater system 10, a superheater system 14 and a water wall 16 of a power station boiler system; when the condenser 1 reaches a low liquid level, the first condensate pump 2-1 and the second condensate pump 2-2 are switched to self-circulation operation, the tube panels of the reheater system 10 and the superheater system 14 are subjected to temperature measurement or DCS auxiliary inspection, so that the tube panels of the reheater system 10 and the superheater system 14 are confirmed to be free of air plugs, namely the tube panels of the reheater system 10 and the superheater system 14 are in a circulation state; sampling at a sampling valve 19 during the flushing process to determine the content of sodium ions in the drained water; if the content of sodium ions is more than 20 mug/L, the steps are repeated for repeated washing until the content of the sodium ions in the drainage water is less than 20 mug/L.
A temporary washing pump is not needed to be connected, and a first condensate pump 2-1 and a second condensate pump 2-2 of the power station boiler system are used as washing power.
The flushing discharge water does not need to be subjected to advanced treatment, and can meet GB 8978 Integrated wastewater discharge Standard by only adjusting the pH value.
When the content of the sodium ions in the discharged water is less than 20 mug/L, the cold state and hot state flushing water quality of the utility boiler system can meet the requirement of GB/T12145 in a short period.
Compared with the prior art, the invention has the following advantages:
1) a condensate pump is adopted to provide flushing power, and a deaerator is adopted to heat flushing water;
2) a temporary water inlet pipeline is designed between the condensed water and the low side to serve as a boiler washing water inlet pipe, the low side pipeline is temporarily blocked at the side of a condenser, and a reheater, a superheater and a water wall system are sequentially washed reversely through a high side pipeline and a steam drum;
3) because the sectional area of a tube panel of a reheater is much larger than that of a superheater, particularly, a W-shaped tube of a high-temperature reheater possibly has gas blockage of partial tubes due to small flow velocity, so that no effective flushing salt can be obtained, according to the calculation of the sectional area of the reheater system, the partial tube panel of the high-temperature reheater is in short connection with a tube panel of a final superheater through a temporary tube, so that the overall flushing flow of the reheater is improved, the gas blockage of the reheater system is judged and eliminated by measuring the wall temperature of the tube panel, and the flushing effect of all the tube panels is ensured;
4) a temporary pipe is connected from the sewage bag to serve as a flushing discharge pipeline, the temporary discharge pipeline is provided with an on-site pressure gauge and a sampling point to control flushing flow and a flushing end point, and the flushing end point is used for sampling and detecting that the content of sodium ions in drained water is less than 20 mu g/L.
5) The system is simple in design, reliable in performance and easy to implement;
6) the problem that salt is accumulated in a boiler superheater and a reheater system to cause the unit to run normally due to the fact that seawater leaked from a heat exchange tube of the condenser enters a water vapor system is effectively solved.
Drawings
FIG. 1 is a schematic flow chart of a system and a method for washing salt deposition in a utility boiler system according to the present invention.
In the figure: 1-a condenser; 2-1-a first condensate pump; 2-a second condensate pump; 3-condensation water self-circulation valve; 4-deaerator; 5-a condensate pipeline; 6-low pressure bypass line; 7, temporary blocking plates; 8, a temporary water inlet pipeline; 9-temporary water inlet valve; 10-a reheater system; 11-high side duct; 12-high bypass valve; 13-temporary nipple; 14-a superheater system; 15-steam pocket; 16-water-cooled wall; 17-discharging water; 18-temporary drain pipe; 19-a sampling valve; 20-pressure gauge; 21-temporary drain valve; 22-unit drain tank.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1, the present invention relates to a system for washing salt deposit in a utility boiler system, which comprises a temporary water inlet pipe 8 for communicating a condensed water pipe 5 and a low pressure bypass pipe 6 of the utility boiler system, and a temporary water inlet valve 9 disposed on the temporary water inlet pipe 8; a temporary short pipe 13 for connecting the reheater system 10 and the superheater system 14 of the utility boiler system; a unit drainage tank 22 communicated with a lower water drum 17 of the utility boiler system through a temporary drainage pipe 18, and a sampling valve 19, a pressure gauge 20 and a temporary drainage valve 21 arranged on the unit drainage tank 22; the condenser 1 → the condensate pump 2 → the condensate pipe 5 → the temporary water inlet pipe 8 → the temporary water inlet valve 9 → the reheater system 10 → the high side pipe 11, the high side valve 12 and the temporary short pipe 13 → the superheater system 14 → the steam drum 15 → the water wall 16 → the drain drum 17 → the temporary discharge pipe 18 → the temporary discharge valve 21 → the unit drain tank 22 forms a reverse flushing circuit.
As a preferred embodiment of the invention, a temporary blocking plate 7 is arranged at the communication part of the temporary water inlet pipeline 8 and the low-pressure bypass pipeline 6 for blocking, and the reheater, the superheater and the water wall system are sequentially subjected to reverse flushing through a high-pressure bypass pipeline and a steam drum.
According to the invention, the pH value of system flushing water is adjusted by virtue of the condensed water ammonia adding point in the power station boiler system, and the flushing water is heated by virtue of four-section steam extraction in the power station boiler system, so that the temperature of the flushing water is increased, and a temporary chemical adding system and a temporary heating system are not required to be connected.
As shown in figure 1, the method for flushing the salt accumulation flushing system of the power station boiler system comprises the steps of supplementing water to a high liquid level by a condenser 1 of the power station boiler system, starting a first condensate pump 2-1 to supplement water to a deaerator 4, adjusting water supplementing flow through a condensate self-circulation valve 3, establishing internal circulation of the deaerator 4 and the condenser 1, adjusting the pH value of the water to be greater than 10.0 by adding ammonia, heating the deaerator 4, stopping heating when the temperature of the water reaches 50-70 ℃, sequentially opening exhaust valves of the deaerator system 10, a superheater system 14, a steam drum 15 and a water wall 16, gradually opening a temporary water inlet valve 9, slowly feeding water to the power station boiler system, sequentially closing the exhaust valves when continuous water flows exist in the exhaust valves of the reheater system 10, the superheater system 14, the steam drum 15 and the water wall 16, gradually opening a sampling valve 19 and a temporary water inlet valve 9 when the reading of a pressure gauge 20 reaches 0.5-0.7 MPa, closing the condensate self-circulation valve 3, starting a second condensate pump 2-2 (frequency conversion regulation) at the same time, and carrying out large-flow water washing on a reheater system 10, a superheater system 14 and a water wall 16 of a power station boiler system; when the condenser 1 reaches a low liquid level, the first condensate pump 2-1 and the second condensate pump 2-2 are switched to self-circulation operation, the tube panels of the reheater system 10 and the superheater system 14 are subjected to temperature measurement or DCS auxiliary inspection, so that the tube panels of the reheater system 10 and the superheater system 14 are confirmed to be free of air plugs, namely the tube panels of the reheater system 10 and the superheater system 14 are in a circulation state; sampling at a sampling valve 19 during the flushing process to determine the content of sodium ions in the drained water; if the content of sodium ions is more than 20 mug/L, the steps are repeated for repeated washing until the content of the sodium ions in the drainage water is less than 20 mug/L.
The method for washing the boiler without the temporary washing pump has the advantages that the first condensate pump 2-1 and the second condensate pump 2-2 of the power station boiler system are used as washing power without the need of connecting the temporary washing pump.
The flushing discharge water does not need to be subjected to advanced treatment, and can meet GB 8978 Integrated wastewater discharge Standard by only adjusting the pH value.
When the content of the sodium ions in the discharged water is less than 20 mug/L, the cold state and hot state flushing water quality of the utility boiler system can meet the requirement of GB/T12145 in a short period.
Claims (8)
1. The utility model provides a rinse-system of power plant boiler system accumulated salt which characterized in that: the system comprises a temporary water inlet pipeline (8) for communicating a condensed water pipeline (5) and a low-pressure bypass pipeline (6) of a power station boiler system, and a temporary water inlet valve (9) arranged on the temporary water inlet pipeline (8); a temporary short-circuiting pipe (13) for connecting a reheater system (10) of the utility boiler system and a superheater system (14); a unit drainage tank (22) communicated with a lower water bag (17) of the utility boiler system through a temporary discharge pipe (18), and a sampling valve (19), a pressure gauge (20) and a temporary discharge valve (21) which are arranged on the unit drainage tank (22); the reverse flushing loop is formed by the condenser (1) → the condensate pump (2) → the condensate pipeline (5) → the temporary water inlet pipeline (8) → the temporary water inlet valve (9) → the reheater system (10) → the high bypass pipeline (11), the high bypass valve (12) and the temporary short connecting pipe (13) → the superheater system (14) → the steam drum (15) → the water cooling wall (16) → the water discharging drum (17) → the temporary discharging pipe (18) → the temporary discharging valve (21) → the unit water discharging tank (22).
2. The utility boiler system saltation rinse system of claim 1 further characterized by: a temporary plugging plate (7) is arranged at the communication part of the temporary water inlet pipeline (8) and the low-pressure bypass pipeline (6) for plugging.
3. The utility boiler system saltation rinse system of claim 1 further characterized by: the pH value of system flushing water is adjusted by means of a condensed water ammonia adding point in a power station boiler system, the flushing water is heated by means of four-section steam extraction in the power station boiler system, the temperature of the flushing water is increased, and a temporary dosing system and a temporary heating system do not need to be connected.
4. The method for washing salt deposit washing system of utility boiler system of any of claims 1 to 3, characterized in that: supplying water to a high liquid level by a condenser (1) of a power station boiler system, starting a first condensate pump (2-1) to supply water to a deaerator (4), adjusting the water supply flow by a condensate self-circulation valve (3), establishing an internal circulation of the deaerator (4) and the condenser (1), adjusting the pH value of water to be more than 10.0 by adding ammonia, heating the deaerator (4), stopping heating when the temperature of water reaches 50-70 ℃, sequentially opening exhaust valves of a reheater system (10), a superheater system (14), a steam drum (15) and a water wall (16), gradually opening a temporary water inlet valve (9), slowly supplying water to the power station boiler system, sequentially closing the exhaust valves when continuous water flows exist in the exhaust valves of the reheater system (10), the superheater system (14), the steam drum (15) and the water wall (16), and when the reading of a pressure gauge (20) reaches 0.5-0.7 MPa, gradually opening a large sampling valve (19) and a temporary water inlet valve (9), closing a condensate self-circulation valve (3), simultaneously carrying out frequency conversion regulation to start a second condensate pump (2-2), and carrying out large-flow water washing on a reheater system (10), a superheater system (14) and a water wall (16) of a power station boiler system; when the condenser (1) reaches a low liquid level, a first condensate pump (2-1) and a second condensate pump (2-2) are switched to self-circulation operation, the tube panels of the reheater system (10) and the superheater system (14) are subjected to temperature measurement or DCS auxiliary inspection to confirm that the tube panels of the reheater system (10) and the superheater system (14) are free of air plugs, namely the tube panels of the reheater system (10) and the superheater system (14) are in a circulation state; sampling at a sampling valve (19) during the flushing process to determine the content of sodium ions in the drained water; if the content of sodium ions is more than 20 mug/L, the steps are repeated for repeated washing until the content of the sodium ions in the drainage water is less than 20 mug/L.
5. The rinsing method according to claim 4, wherein: a temporary washing pump is not needed to be connected, and a first condensate pump (2-1) and a second condensate pump (2-2) of the power station boiler system are used as washing power.
6. The rinsing method according to claim 4, wherein: the pH value of system flushing water is adjusted by means of a condensed water ammonia adding point in a power station boiler system, the flushing water is heated by means of four-section steam extraction in the power station boiler system, the temperature of the flushing water is increased, and a temporary dosing system and a temporary heating system do not need to be connected.
7. The rinsing method according to claim 4, wherein: the flushing discharge water does not need to be subjected to advanced treatment, and can meet GB 8978 Integrated wastewater discharge Standard by only adjusting the pH value.
8. The system and the method for washing the salt deposit in the utility boiler system according to claim 1, wherein: when the content of the sodium ions in the discharged water is less than 20 mug/L, the cold state and hot state flushing water quality of the power station boiler system can meet the requirement of GB/T12145 in a short time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010852760.0A CN111810934A (en) | 2020-08-22 | 2020-08-22 | Washing system and washing method for salt accumulation of power station boiler system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010852760.0A CN111810934A (en) | 2020-08-22 | 2020-08-22 | Washing system and washing method for salt accumulation of power station boiler system |
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| CN111810934A true CN111810934A (en) | 2020-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010852760.0A Pending CN111810934A (en) | 2020-08-22 | 2020-08-22 | Washing system and washing method for salt accumulation of power station boiler system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856382A (en) * | 2021-04-02 | 2021-05-28 | 西安热工研究院有限公司 | System and method for preventing air lock in power station boiler superheater cleaning process |
| CN113154359A (en) * | 2021-04-20 | 2021-07-23 | 西安热工研究院有限公司 | System for chemically cleaning tower boiler of power plant and using method |
-
2020
- 2020-08-22 CN CN202010852760.0A patent/CN111810934A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112856382A (en) * | 2021-04-02 | 2021-05-28 | 西安热工研究院有限公司 | System and method for preventing air lock in power station boiler superheater cleaning process |
| CN113154359A (en) * | 2021-04-20 | 2021-07-23 | 西安热工研究院有限公司 | System for chemically cleaning tower boiler of power plant and using method |
| CN113154359B (en) * | 2021-04-20 | 2022-12-09 | 西安热工研究院有限公司 | System for chemically cleaning tower boiler of power plant and using method |
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