CN216113994U - Water feeding system for boiler - Google Patents
Water feeding system for boiler Download PDFInfo
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- CN216113994U CN216113994U CN202121682221.3U CN202121682221U CN216113994U CN 216113994 U CN216113994 U CN 216113994U CN 202121682221 U CN202121682221 U CN 202121682221U CN 216113994 U CN216113994 U CN 216113994U
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Abstract
The utility model discloses a boiler water supply system, which comprises a drain tank, a low-pressure deoxygenation and desalination water tank, a drain pump, a bypass pipeline, a high-pressure deaerator, a water feeding pump, a high-pressure heater, an economizer and a boiler, wherein the drain tank is connected with the high-pressure deaerator; the water outlet of the drain tank is communicated with the water inlet of the drain pump, the water outlet of the drain pump is divided into two paths, one path is communicated with the water inlet of the boiler through a bypass pipeline, the other path and the water outlet of the low-pressure deoxygenation and dehydration water tank are communicated with the water inlet of the high-pressure deaerator, the water outlet of the high-pressure deaerator is communicated with the water inlet of the water feeding pump, and the water outlet of the water feeding pump is communicated with the water inlet of the high-pressure heater. Has the advantages that: the utility model can simultaneously meet the water feeding requirements of a normal operation boiler and a standby boiler, can reduce the temperature of the water feeding when the standby boiler is started, shortens the starting time of the boiler, avoids the problems of pipeline vibration, creep deformation, deformation and the like caused by large temperature difference between the temperature in the boiler and the water feeding, ensures the stable operation of the boiler, and can also reduce the maintenance frequency and the operation and maintenance cost.
Description
The technical field is as follows:
the utility model relates to the field of boilers, in particular to a boiler water supply system.
Background art:
in some chemical enterprises, when a boiler normally operates, the temperature of water entering the boiler is required to be about 180 ℃, and the water must be desalted water subjected to chemical deoxidization; in order to realize water resource recycling, water produced by other systems in a plant area is collected, low-pressure deoxygenation is performed to obtain low-pressure deoxygenated and desalted water with the pressure of 1.3Mpa and the temperature of 128.4 ℃ to be used as boiler feed water of a thermal power device, and then high-pressure deoxygenation and heat exchange are performed to raise the temperature so that the outlet water temperature reaches 180 ℃ to be used as boiler feed water. However, for the standby boiler, the standby boiler is stopped for a long time, the temperature in the boiler is the ambient temperature, and the water feeding temperature is not more than 100 ℃ according to the water feeding requirement of the standby boiler; when the reserve boiler went up water, if direct add the reserve boiler with 180 ℃ water, because the temperature difference is great with the feedwater in the stove, can take place the pipeline vibration when the water feeding, simultaneously the water hammer also can arouse metal creep, metal deformation scheduling problem, seriously influences the steady operation of reserve boiler, has increased maintenance frequency and fortune dimension cost.
The utility model has the following contents:
the utility model aims to provide a boiler water supply system which can meet the water supply requirements of a normal operation boiler and a standby boiler at the same time and ensure the stable operation of the boiler.
The utility model is implemented by the following technical scheme:
a boiler water supply system comprises a drain tank, a low-pressure deoxygenation and desalination water tank, a drain pump, a bypass pipeline, a high-pressure deaerator, a feed pump, a high-pressure heater, an economizer and a boiler;
the water outlet of the drain tank is communicated with the water inlet of the drain pump, the water outlet of the drain pump is divided into two paths, one path is communicated with the water inlet of the header under the water wall of the boiler through a bypass pipeline, the other path and the water outlet of the low-pressure deoxygenation and desalination water tank are communicated with the water inlet of the high-pressure deaerator, the water outlet of the high-pressure deaerator is communicated with the water inlet of the feed pump, the water outlet of the feed pump is communicated with the water inlet of the high-pressure heater, the water outlet of the high-pressure heater is communicated with the water inlet of the economizer, and the water outlet of the economizer is communicated with the steam pocket of the boiler.
Further, the device also comprises a first medicine box which is filled with dilute ammonia water;
the water outlet of the low-pressure deoxygenation and desalination water tank is provided with a PH meter, and the medicine outlet of the first medicine box is communicated with the upstream end of the pipeline of the low-pressure deoxygenation and desalination water tank and the high-pressure deaerator.
Further, the device also comprises a second medicine box which is filled with hydrazine solution with the concentration of 5 to 7 percent;
and the medicine outlet of the second medicine box is communicated with a pipeline communicated with the high-pressure deaerator and the water feeding pump.
Further, the medicine box comprises a third medicine box, wherein the third medicine box is filled with trisodium phosphate and disodium hydrogen phosphate solution, and the volume ratio of the trisodium phosphate to the disodium hydrogen phosphate solution is 2: 1;
and a medicine outlet of the third medicine box is communicated with a steam drum of the boiler.
Furthermore, a bypass valve is arranged on the bypass pipeline, and a shut-off valve is arranged on the pipeline for communicating the drain pump and the high-pressure deaerator.
Further, the bypass valve is a flow regulating valve.
The utility model has the advantages that:
the utility model can simultaneously meet the water feeding requirements of a normal operation boiler and a standby boiler, can reduce the temperature of the water feeding when the standby boiler is started, shortens the starting time of the boiler, avoids the problems of pipeline vibration, creep deformation, deformation and the like caused by large temperature difference between the temperature in the boiler and the water feeding, ensures the stable operation of the boiler, and can also reduce the maintenance frequency and the operation and maintenance cost.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the system connection of the present embodiment;
in the figure: the device comprises a drain tank 1, a low-pressure deoxygenation and desalination water tank 2, a drain pump 3, a bypass pipeline 4, a high-pressure deaerator 5, a water feeding pump 6, a high-pressure heater 7, an economizer 8, a boiler 9, a steam pocket 10, a bypass valve 11, a shut-off valve 12, a first medicine box 13, a second medicine box 14, a third medicine box 15 and a pH meter 16.
The specific implementation mode is as follows:
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, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the water supply system of the boiler shown in fig. 1 comprises a drain tank 1, a low-pressure deoxygenation and desalination water tank 2, a drain pump 3, a bypass pipeline 4, a high-pressure deaerator 5, a water supply pump 6, a high-pressure heater 7, an economizer 8 and a boiler 9;
after chemical deoxygenation, the hydrophobic water generated by each superheater and each high-pressure steam pipeline of the boiler 9 body is collected in the hydrophobic tank 1 due to the fact that cold desalted water with the water temperature of 78-80 ℃ is obtained; the cold desalted water provided by the water supply workshop in the plant area is subjected to gasification transformation heating and low-pressure deoxygenation to obtain low-pressure deoxygenated desalted water with the pressure of 1.3Mpa and the temperature of 128.4 ℃, and the low-pressure deoxygenated desalted water is collected in the low-pressure deoxygenated desalted water tank 2.
The water outlet of the drain tank 1 is communicated with the water inlet of the drain pump 3, the water outlet of the drain pump 3 is divided into two paths, one path is communicated with the water inlet of a header under a water wall of the boiler 9 through a bypass pipeline 4, the other path and the water outlet of the low-pressure deoxygenation and desalination water tank 2 are communicated with the water inlet of the high-pressure deaerator 5, the water outlet of the high-pressure deaerator 5 is communicated with the water inlet of the water feed pump 6, the water outlet of the water feed pump 6 is communicated with the water inlet of the high-pressure heater 7, the water outlet of the high-pressure heater 7 is communicated with the water inlet of the economizer 8, and the water outlet of the economizer 8 is communicated with the steam pocket 10 of the boiler 9. The bypass line 4 is provided with a bypass valve 11, and the bypass valve 11 is a flow rate control valve. A shut-off valve 12 is arranged on a pipeline for communicating the drain pump 3 with the high-pressure deaerator 5.
The device also comprises a first medicine box 13 which is filled with dilute ammonia water; a PH meter 16 is arranged at the water outlet of the low-pressure deoxygenation and desalination water tank 2, and the medicine outlet of the first medicine box 13 is communicated with the upstream end of a pipeline for communicating the low-pressure deoxygenation and desalination water tank 2 with the high-pressure deaerator 5. The PH value of the feed water is adjusted to be in the range of 8.8-9.3 by adding dilute ammonia water, so that the corrosion of acidic water to the boiler 9 and the pipeline material at high temperature is prevented;
the device also comprises a second medicine box 14, wherein hydrazine solution with the concentration of 5-7% is contained in the second medicine box; the medicine outlet of the second medicine box 14 is communicated with a pipeline which is communicated with the high-pressure deaerator 5 and the water feeding pump 6. The stirring of the water supply pump 6 is beneficial to the full reaction of the medicine and the water, the purpose of chemical deoxidization is achieved, and the surplus of the hydrazine in the water supply is maintained at 20-50 mu g/L. The method is used as an auxiliary measure after thermal deoxidization by hydrazine deoxidization so as to completely eliminate residual oxygen in water without increasing the salt content of water in the boiler 9. When the pressure is higher than 6.3Mpa, sodium sulfite will decompose into sulfur dioxide and hydrogen sulfide, which are very corrosive. Therefore, the high-pressure boiler 9 mostly adopts hydrazine to remove oxygen, and the hydrazine reacts with the oxygen to generate nitrogen and water, which is beneficial to preventing the corrosion of the boiler 9.
The medicine box also comprises a third medicine box 15, wherein a trisodium phosphate solution and a disodium hydrogen phosphate solution are filled in the third medicine box, and the volume ratio of the trisodium phosphate to the disodium hydrogen phosphate solution is 2: 1; the medicine outlet of the third medicine box 15 is communicated with the steam drum 10 of the boiler 9. The excess amount of phosphate radical in the furnace water is maintained at 2-10 mg/L. In order to prevent the generation of calcium scale and alkaline corrosion in the boiler 9, phosphate is added to the feed water of the boiler 9 so that Ca introduced into the boiler with the feed water of the boiler 92+No scale is formed, but grain slag is generated and is discharged through the boiler 9. Adding phosphate solution into boiler feed water, controlling a certain amount of phosphate radical, and generating basic calcium phosphate under alkaline condition, wherein the basic calcium phosphate is soft water granulated slag and is very easy to dissolveThe boiler is easy to discharge sewage along with the boiler 9; therefore, only the PO in the furnace water is controlled4 3-The amount of Ca in the furnace water can be reduced2+And (4) content.
In this embodiment, the dosage of the three medicines is controlled by adjusting the stroke of the medicine-feeding pump.
The working process is as follows:
when water is supplied to a boiler 9 which normally runs, a bypass valve 11 is closed, a shut-off valve 12 is opened, water is supplied to a high-pressure deaerator 5 by a drain tank 1 and a low-pressure deaerating and desalting water tank 2 together, the temperature of the water after entering the high-pressure deaerator 5 and being heated and deaerated by secondary medium-pressure steam (the pressure is 1.3MPa, the temperature is 220 ℃) is increased to 158 ℃, dissolved oxygen is less than or equal to 0.007mg/L, the water is pumped out by a water feed pump 6, the water is sent to a high-pressure heater 7 and is increased to 180 ℃ after heat exchange with the secondary medium-pressure steam, then the water enters an economizer 8 to absorb the heat of the flue gas at the tail part of the boiler 9, the water enters a steam pocket 10 of the boiler 9 after the temperature reaches 253 ℃, and no steam is generated in the process.
When the standby boiler 9 is supplied with water, the bypass valve 11 is opened, the shut-off valve 12 is closed, the drain tank 1 directly supplies water to the boiler 9, and the water temperature in the drain tank 1 is 78-80 ℃ and is desalted water subjected to chemical deoxygenation, so that the water supply requirement of the standby boiler 9 is met, and the problems of pipeline vibration, creep deformation and the like caused by large temperature difference between the temperature in the boiler and the supplied water can be avoided. Because the temperature of the water supply of the standby boiler 9 is reduced, the problem that the water supply time is long when the standby boiler 9 is started and the standby boiler 9 is started due to the fact that the water supply speed must be reduced when 180 ℃ water is directly used for supplying water to the standby boiler 9 to prevent the temperature difference between the inner wall and the outer wall of the heating surface from being too large, and the water supply speed can be increased, and the starting time of the standby boiler 9 can be shortened.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A boiler water supply system is characterized by comprising a drain tank, a low-pressure deoxygenation and desalination water tank, a drain pump, a bypass pipeline, a high-pressure deaerator, a water feeding pump, a high-pressure heater, an economizer and a boiler;
the water outlet of the drain tank is communicated with the water inlet of the drain pump, the water outlet of the drain pump is divided into two paths, one path is communicated with the water inlet of the header under the water wall of the boiler through a bypass pipeline, the other path and the water outlet of the low-pressure deoxygenation and desalination water tank are communicated with the water inlet of the high-pressure deaerator, the water outlet of the high-pressure deaerator is communicated with the water inlet of the feed pump, the water outlet of the feed pump is communicated with the water inlet of the high-pressure heater, the water outlet of the high-pressure heater is communicated with the water inlet of the economizer, and the water outlet of the economizer is communicated with the steam pocket of the boiler.
2. A boiler feedwater system as claimed in claim 1 further comprising a first tank;
the water outlet of the low-pressure deoxygenation and desalination water tank is provided with a PH meter, and the medicine outlet of the first medicine box is communicated with the upstream end of the pipeline of the low-pressure deoxygenation and desalination water tank and the high-pressure deaerator.
3. A boiler feedwater system as claimed in claim 1 further comprising a second tank;
and the medicine outlet of the second medicine box is communicated with a pipeline communicated with the high-pressure deaerator and the water feeding pump.
4. A boiler feedwater system as claimed in claim 1 further comprising a third tank;
and a medicine outlet of the third medicine box is communicated with a steam drum of the boiler.
5. The boiler water supply system according to claim 1, wherein a bypass valve is arranged on the bypass pipeline, and a shut-off valve is arranged on a pipeline for communicating the drain pump and the high-pressure deaerator.
6. A boiler feedwater system according to claim 5, wherein said bypass valve is a flow control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121682221.3U CN216113994U (en) | 2021-07-22 | 2021-07-22 | Water feeding system for boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121682221.3U CN216113994U (en) | 2021-07-22 | 2021-07-22 | Water feeding system for boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216113994U true CN216113994U (en) | 2022-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121682221.3U Active CN216113994U (en) | 2021-07-22 | 2021-07-22 | Water feeding system for boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216113994U (en) |
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2021
- 2021-07-22 CN CN202121682221.3U patent/CN216113994U/en active Active
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