CN215570393U - Boiler chemical cleaning system - Google Patents
Boiler chemical cleaning system Download PDFInfo
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- CN215570393U CN215570393U CN202121308448.1U CN202121308448U CN215570393U CN 215570393 U CN215570393 U CN 215570393U CN 202121308448 U CN202121308448 U CN 202121308448U CN 215570393 U CN215570393 U CN 215570393U
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Abstract
A chemical cleaning system for a boiler comprises a cleaning unit, a low-pressure system unit, a medium-pressure system unit and a high-pressure system unit; the cleaning system unit comprises a dosing tank, an outlet of the dosing tank is connected with a cleaning tank through a pipeline to the cleaning tank, an outlet main pipe is connected with the outlet of the cleaning tank, and a cleaning tank outlet valve, a cleaning pump and a cleaning pump outlet valve are sequentially arranged on the outlet main pipe; an outlet main pipe behind the outlet valve of the cleaning pump is divided into two branches, one branch is connected to the cleaning box through a cleaning pump recirculation pipeline, a cleaning pump recirculation valve is installed on the cleaning pump recirculation pipeline, the other branch is sequentially connected to the low-pressure system, the medium-pressure system and the high-pressure system through a liquid inlet main pipe, and finally the cleaning unit is returned through a liquid return main pipe. The system is simple, and can realize the independent circulating chemical cleaning of the high, medium and low pressure systems of the waste heat boiler.
Description
Technical Field
The utility model belongs to the technical field of chemical cleaning of boilers in the energy and power industry, and particularly relates to a chemical cleaning system for a boiler.
Background
The chemical cleaning of the boiler refers to a method for cleaning the inner surface of the heating surface of the boiler and forming a good passive film on the metal surface by adopting a certain cleaning process and carrying out chemical reaction on an aqueous solution of a chemical agent and corrosion products, sediments and pollutants in a water vapor system of the boiler. The necessary measures for preventing accidents caused by corrosion and scaling of the heating surface during chemical cleaning are also one of effective measures for improving the heat efficiency of the boiler and the quality of water vapor of a unit. According to the regulations in the electric power industry standard DL/T794-2012 guide rule for chemical cleaning of boilers in thermal power plants, the cleaning range of the newly-built boilers comprises: the direct current furnace and the steam drum furnace with the superheated steam outlet pressure of 9.8MPa or more need to be chemically cleaned before production; when the scale amount is less than 150g/m in a drum furnace with the pressure of 9.8MPa2In this case, the acid washing may be omitted, but the alkali washing or the alkali boiling is necessary. The operation boiler also regulates the cleaning interval according to the main steam pressure and the dirt amount.
Chemical cleaning of power plant exhaust heat boilers generally has the following problems.
Firstly, the exhaust-heat boiler of power plant is common is three pressure formulas or two pressure formulas, generally divide into three systems of high-middle-low pressure or two systems of high-low pressure, and the central line elevation of each system steam pocket is different, if carry out the circulation simultaneously and wash, then the liquid level is difficult to control, can't wash below the steam pocket central line of each system totally. And the flow areas of the systems are different and are all larger, if the cleaning is carried out simultaneously, the requirement on the parameters of the cleaning pump is higher, the water distribution of the systems needs to be controlled more accurately, and the cleaning difficulty is increased.
Secondly, in the system with the same pressure grade, the flow areas of all the heating surfaces are greatly different, for example, the flow areas of the economizer and the evaporator in the cleaning range may have a difference of 10 times. If the waste heat boiler is cleaned according to the conventional process flow of the waste heat boiler, the difficulty is increased on how to control the flow velocity in each pipeline within the standard specified range in the cleaning process.
And thirdly, the chemical cleaning process comprises the steps of water washing, alkali washing, water washing after alkali washing, acid washing, water washing after acid washing, rinsing, passivation and the like, wherein the types of medicines, the concentrations of medicines, the temperature of liquid medicine, the liquid return positions and the like in each step are different. The cleaning system can safely, stably and quickly meet the process requirements according to the requirements of different cleaning steps.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model aims to provide a boiler chemical cleaning system which can realize the independent circulating chemical cleaning of a high-medium-low pressure system of a waste heat boiler; the cleaning system is easy to control the flow distribution, so that the flow rate difference of all heating surfaces in the same system in the cleaning process is small and is in a range specified by a standard; each step in the cleaning process is simple and safe to operate, the cleaning process is stable, the system response is rapid, and the requirements of the chemical cleaning process are met.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a chemical cleaning system for a boiler comprises a cleaning unit, a low-pressure system unit, a medium-pressure system unit and a high-pressure system unit;
the cleaning system unit comprises a dosing tank 1, an outlet of the dosing tank 1 is connected with a cleaning tank 3 through a cleaning tank pipeline 2, an outlet of the cleaning tank 3 is connected with an outlet main pipe 4, and a cleaning tank outlet valve 5, a cleaning pump 6 and a cleaning pump outlet valve 7 are sequentially arranged on the outlet main pipe 4;
an outlet main pipe 4 behind the cleaning pump outlet valve 7 is divided into two branches, one branch is connected to the cleaning box 3 through a cleaning pump recirculation pipeline 8, a cleaning pump recirculation valve 9 is installed on the cleaning pump recirculation pipeline 8, the other branch is sequentially connected to a low-pressure system, a medium-pressure system and a high-pressure system through a liquid inlet main pipe 10, and finally returns to the cleaning unit through a liquid return main pipe 42.
The liquid return main pipe 42 comprises two branches, one branch is connected with a wastewater tank 52 through a liquid return valve, the other branch is connected with the outlet main pipe 4 through a recirculation valve 49, a sampling pipeline 44 is installed on the liquid return main pipe 42, and a sampling valve 45 is installed on the sampling pipeline 44; the liquid return mother pipe 42 is provided with a rainwater well pipeline 46, and the rainwater well pipeline 46 is provided with a rainwater well valve 47.
And a monitoring pipe inlet valve 11, a monitoring pipe flowmeter 12, a monitoring pipe 13 and a monitoring pipe outlet valve 14 are sequentially connected between the liquid inlet main pipe 10 and the liquid return main pipe 42.
The top of the cleaning tank 3 is connected with a demineralized water replenishing pipeline 53, the demineralized water replenishing pipeline is provided with a demineralized water replenishing valve 54, the top of the cleaning tank 3 is connected with a steam heat source pipeline 55, and the steam heat source pipeline 55 is provided with a steam heat source valve 56.
The low pressure system unit includes the low pressure economizer feed liquor pipeline 15 that links to each other with the female pipe 10 of feed liquor, install low pressure economizer feed liquor valve 16 on the low pressure economizer feed liquor pipeline 15, the female pipe 10 of feed liquor links to each other with low pressure evaporimeter feed liquor pipeline 18, install low pressure economizer feed liquor valve 19 on the low pressure evaporimeter feed liquor pipeline 18, low pressure economizer feed liquor pipeline 15 is connected to low pressure economizer 17, low pressure evaporimeter feed liquor pipeline 18 is connected to low pressure evaporimeter 20, low pressure economizer 17 and low pressure evaporimeter 20 all are connected to low pressure steam pocket 21, low pressure steam pocket 21 links to each other with liquid return pipe 42 through low pressure steam pocket liquid return pipe 22, install low pressure steam pocket liquid return valve 23 on the low pressure steam pocket liquid return pipe 22.
The medium-pressure system unit comprises a medium-pressure economizer liquid inlet pipeline 24 connected with a liquid inlet main pipe 10, a medium-pressure economizer liquid inlet valve 25 is installed on the medium-pressure economizer liquid inlet pipeline 24, the liquid inlet main pipe 10 is connected with a medium-pressure evaporator liquid inlet pipeline 27, a medium-pressure economizer liquid inlet valve 28 is installed on the medium-pressure evaporator liquid inlet pipeline 27, the medium-pressure economizer liquid inlet pipeline 24 is connected to a medium-pressure economizer 26, the medium-pressure evaporator liquid inlet pipeline 27 is connected to a medium-pressure evaporator 29, the medium-pressure economizer 26 and the medium-pressure evaporator 29 are both connected to a medium-pressure steam drum 30, the medium-pressure steam drum 30 is connected with a liquid return pipeline 42 through a medium-pressure steam drum liquid return pipeline 31, and a medium-pressure steam drum liquid return valve 32 is installed on the medium-pressure steam drum liquid return pipeline 31.
High-pressure system unit includes the high-pressure economizer inlet liquid pipeline 33 that links to each other with the female pipe 10 of feed liquor, install high-pressure economizer feed liquor valve 34 on the high-pressure economizer inlet liquid pipeline 33, the female pipe 10 of feed liquor links to each other with high-pressure evaporimeter inlet liquid pipeline 36, install high-pressure economizer feed liquor valve 37 on the high-pressure evaporimeter inlet liquid pipeline 36, high-pressure economizer inlet liquid pipeline 33 is connected to high-pressure economizer 35, high-pressure evaporimeter inlet liquid pipeline 36 is connected to high-pressure evaporimeter 37, high-pressure economizer 35 and high-pressure evaporimeter 38 all are connected to high-pressure steam pocket 39, high-pressure steam pocket 39 links to each other with liquid return pipe 42 through high-pressure steam pocket liquid return pipe 40, install high-pressure steam pocket liquid return valve 41 on the high-pressure steam pocket liquid return pipe 40.
The utility model has the beneficial effects that:
the system is simple, and can realize independent circulating chemical cleaning of the high, medium and low pressure systems of the waste heat boiler; the cleaning system is easy to control the flow distribution, so that the flow rate difference of all heating surfaces in the same system in the cleaning process is small and is in a range specified by a standard; each step in the cleaning process is simple and safe to operate, the cleaning process is stable, the system response is rapid, and the requirements of the chemical cleaning process are met.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the drawings, 1: dosing box, 2: to wash tank piping, 3: cleaning box, 4: outlet header, 5: cleaning tank outlet valve, 6: cleaning pump, 7: purge pump outlet valve, 8: purge pump recirculation line, 9: purge pump recirculation valve, 10: liquid inlet main pipe, 11: monitor tube inlet valve, 12: monitor tube flow meter, 13: monitoring tube, 14: monitor tube outlet valve, 15: low-pressure economizer feed liquor pipeline, 16: low-pressure economizer feed valve, 17: low-pressure economizer, 18: low-pressure evaporator liquid inlet pipe, 19: low pressure evaporator feed liquor valve, 20: low-pressure evaporator, 21: low-pressure steam drum, 22: low-pressure drum liquid return pipe, 23: low-pressure drum liquid return valve, 24: medium-pressure economizer feed liquor pipeline, 25: medium-pressure economizer feed valve, 26: medium-pressure economizer, 27: medium-pressure evaporator liquid inlet pipe, 28: medium pressure evaporator feed valve, 29: medium-pressure evaporator, 30: medium-pressure drum, 31: medium-pressure drum liquid return pipeline, 32: medium-pressure drum liquid return valve, 33: high-pressure economizer inlet pipe, 34: high-pressure economizer feed liquor valve, 35: high-pressure economizer, 36: high-pressure evaporator liquid inlet pipe, 37: high-pressure evaporator feed liquor valve, 38: high-pressure evaporator, 39: high-pressure steam drum, 40: high-pressure drum liquid return pipeline, 41: high-pressure drum liquid return valve, 42: liquid return mother pipe, 43: liquid return valve, 44: sampling pipe, 45: sampling valve, 46: to catch water well piping, 47: to catch water well valve, 48: recirculation line, 49: recirculation valve, 50: liquid inlet mother pipe discharge pipe, 51: liquid inlet main pipe discharge valve, 52: wastewater tank, 53: demineralized water makeup pipe, 54: demineralized water makeup valve, 55: steam heat source pipe, 56: a steam heat source valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1: comprises a cleaning unit, a low-pressure system unit, a medium-pressure system unit and a high-pressure system unit.
The cleaning system unit comprises a dosing box 1, and an outlet of the dosing box 1 is connected with a cleaning box 3 through a pipeline 2 to the cleaning box. An outlet of the cleaning box 3 is connected with an outlet main pipe 4. And a cleaning tank outlet valve 5, a cleaning pump 6 and a cleaning pump outlet valve 7 are sequentially arranged on the outlet main pipe 4.
The cleaning pump outlet valve 7 is followed by two way branches, one way is connected to the cleaning tank 3 through the cleaning pump recirculation pipeline 8, install the cleaning pump recirculation valve 9 on the cleaning pump recirculation pipeline 8. The other path is connected to a low pressure system, a medium pressure system and a high pressure system in sequence through a liquid inlet main pipe 10 and finally returns to the cleaning unit through a liquid return main pipe 42. The liquid return main pipe 42 comprises two branches, one branch is connected with the wastewater tank 52 through a liquid return valve, and the other branch is connected with the outlet main pipe 4 through a recirculation valve 49. A sampling pipeline 44 is arranged on the liquid return main pipe 42, and a sampling valve 45 is arranged on the sampling pipeline 44; the liquid return mother pipe 42 is provided with a rainwater well pipeline 46, and the rainwater well pipeline 46 is provided with a rainwater well valve 47.
And a monitoring pipe inlet valve 11, a monitoring pipe flowmeter 12, a monitoring pipe 13 and a monitoring pipe outlet valve 14 are sequentially connected between the liquid inlet main pipe 10 and the liquid return main pipe 42.
The top of the cleaning box 3 is connected with a demineralized water replenishing pipeline 53, and a demineralized water replenishing valve 54 is installed on the demineralized water replenishing pipeline. The top of the cleaning water tank 3 is connected with a steam heat source pipeline 55, and a steam heat source valve 56 is arranged on the steam heat source pipeline 55.
The low pressure system unit includes the low pressure economizer liquid inlet pipe 15 that links to each other with female pipe 10 of feed liquor, install low pressure economizer feed liquor valve 16 on the low pressure economizer liquid inlet pipe 15, female pipe 10 of feed liquor links to each other with low pressure evaporator liquid inlet pipe 18, install low pressure economizer feed liquor valve 19 on the low pressure evaporator liquid inlet pipe 18. The low-pressure economizer liquid inlet pipeline 15 is connected to a low-pressure economizer 17, and the low-pressure evaporator liquid inlet pipeline 18 is connected to a low-pressure evaporator 20. The low-pressure economizer 17 and the low-pressure evaporator 20 are both connected to a low-pressure drum 21. The low-pressure steam drum 21 is connected with a liquid return pipeline 42 through a low-pressure steam drum liquid return pipeline 22, and a low-pressure steam drum liquid return valve 23 is installed on the low-pressure steam drum liquid return pipeline 22.
The medium-pressure system unit comprises a medium-pressure economizer liquid inlet pipeline 24 connected with a liquid inlet main pipe 10, a medium-pressure economizer liquid inlet valve 25 is installed on the medium-pressure economizer liquid inlet pipeline 24, the liquid inlet main pipe 10 is connected with a medium-pressure evaporator liquid inlet pipeline 27, and a medium-pressure economizer liquid inlet valve 28 is installed on the medium-pressure evaporator liquid inlet pipeline 27. The medium-pressure economizer liquid inlet pipe 24 is connected to a medium-pressure economizer 26, and the medium-pressure evaporator liquid inlet pipe 27 is connected to a medium-pressure evaporator 29. The medium-pressure economizer 26 and the medium-pressure evaporator 29 are both connected to a medium-pressure drum 30. The medium-pressure steam drum 30 is connected with a liquid return pipeline 42 through a medium-pressure steam drum liquid return pipeline 31, and a medium-pressure steam drum liquid return valve 32 is installed on the medium-pressure steam drum liquid return pipeline 31.
The high-pressure system unit includes the high-pressure economizer liquid inlet pipe 33 that links to each other with female pipe 10 of feed liquor, install high-pressure economizer feed liquor valve 34 on the high-pressure economizer liquid inlet pipe 33, female pipe 10 of feed liquor links to each other with high-pressure evaporator liquid inlet pipe 36, install high-pressure economizer feed liquor valve 37 on the high-pressure evaporator liquid inlet pipe 36. The high-pressure economizer liquid inlet pipeline 33 is connected to a high-pressure economizer 35, and the high-pressure evaporator liquid inlet pipeline 36 is connected to a high-pressure evaporator 37. The high-pressure economizer 35 and the high-pressure evaporator 38 are both connected to a high-pressure drum 39. The high-pressure steam drum 39 is connected with a liquid return pipeline 42 through a high-pressure steam drum liquid return pipeline 40, and a high-pressure steam drum liquid return valve 41 is installed on the high-pressure steam drum liquid return pipeline 40.
The working principle of the utility model is as follows:
and carrying out independent circulating chemical cleaning on the high, medium and low pressure systems of the waste heat boiler. The cleaning process comprises the following steps: a low-pressure system: the cleaning box 3 → the outlet pipeline 4 → the liquid inlet main pipe 10 → the liquid inlet pipeline 15 of the low-pressure economizer/the liquid inlet pipeline 18 of the low-pressure evaporator → the low-pressure economizer 17/the low-pressure evaporator 20 → the low-pressure drum 21 → the low-pressure drum liquid return pipeline 22 → the liquid return main pipe 42 → the recirculation valve 49/the liquid return valve 43. A medium-pressure system: the cleaning box 3 → the outlet pipeline 4 → the liquid inlet main pipe 10 → the liquid inlet pipeline 24 of the medium-pressure economizer/the liquid inlet pipeline 27 of the medium-pressure evaporator → the medium-pressure economizer 26/the medium-pressure evaporator 29 → the medium-pressure steam drum 30 → the liquid return pipeline 31 of the medium-pressure steam drum → the liquid return main pipe 42 → the recirculation valve 49/the liquid return valve 43. High-pressure system: the cleaning box 3 → the outlet pipeline 4 → the liquid inlet main pipe 10 → the high-pressure economizer liquid inlet pipeline 33/the high-pressure evaporator liquid inlet pipeline 36 → the high-pressure economizer 35/the high-pressure evaporator 38 → the high-pressure steam drum 39 → the high-pressure steam drum liquid return pipeline 40 → the liquid return main pipe 42 → the recirculation valve 49/the liquid return valve 43. The economizer and the evaporator are simultaneously fed with liquid, and then the liquid is returned through the downcomer, the cleaning system is easy to control the flow distribution, and the flow speed difference of all heating surfaces in the same system in the cleaning process is not large and is within the range specified by the standard.
The chemical cleaning steps for each system typically include water rinsing, acid washing, post-acid wash water rinsing, rinsing and passivation, and draining. Taking the low pressure system as an example, the flow of the medium pressure system and the high pressure system is similar. When the water washing is performed, the demineralized water replenishing valve 54 is opened, and the demineralized water is replenished to the washing tank 3 through the demineralized water replenishing pipe 53. And opening a cleaning box outlet valve 5, a cleaning pump outlet valve 7, a low-pressure economizer liquid inlet valve 16, a low-pressure evaporator liquid inlet valve 19, a low-pressure steam drum liquid return valve 23 and a rainwater well valve 47. And starting the cleaning pump 6, and cleaning the low-pressure system by the desalted water according to the flow from the cleaning box 3 → the outlet pipeline 4 → the liquid inlet main pipe 10 → the low-pressure economizer liquid inlet pipeline 15/the low-pressure evaporator liquid inlet pipeline 18 → the low-pressure economizer 17/the low-pressure evaporator 20 → the low-pressure steam pocket 21 → the low-pressure steam pocket liquid return pipeline 22 → the liquid return main pipe 42 → the rainwater well valve 47 until the effluent is transparent and has no impurities. During the period, the flow rates in the low-pressure economizer 17, the low-pressure evaporator 20 and the system thereof are controlled within a specified range by adjusting the opening degrees of the outlet valve 7 of the cleaning pump, the liquid inlet valve 16 of the low-pressure economizer, the liquid inlet valve 19 of the low-pressure evaporator and the liquid return valve 23 of the low-pressure steam drum. And maintaining the opening of the valve after the adjustment is finished. The monitor tube inlet valve 11 and the monitor tube outlet valve 14 are opened, and the monitor tube flowmeter 12 is adjusted to a predetermined range, so that the monitor tube and the indicator piece in the monitor tube are ensured to participate in the pickling process in the same way.
After the water washing is completed, the acid washing step is performed, and the demineralized water replenishing valve 54 is opened to replenish the demineralized water to the washing tank 3. In the state of the water washing step, the recirculation valve 49 is opened, the valve 47 to the rainwater well is closed, the demineralized water circulates, the demineralized water is prepared to be heated according to the flow of the cleaning tank 3 → the outlet pipeline 4 → the liquid inlet main pipe 10 → the low-pressure economizer liquid inlet pipeline 15/the low-pressure evaporator liquid inlet pipeline 18 → the low-pressure economizer 17/the low-pressure evaporator 20 → the low-pressure steam pocket 21 → the low-pressure steam pocket liquid return pipeline 22 → the liquid return main pipe 42 → the cleaning pump 6, and the demineralized water replenishing valve is opened or closed according to the requirements of the low-pressure steam pocket 21 and the cleaning tank 3. The steam heat source valve is opened, and the steam is sent into the cleaning tank 3 through the steam heat source pipeline 55 and is fully mixed with the demineralized water to be heated. When the temperature reaches the purge temperature, the steam heat source valve 56 is closed. The subsequent steam heat source valve 56 is opened or closed as required by the desired temperature. And after the temperature rise is finished, medicine feeding is carried out. The medicines are prepared in the medicine preparation box 1 and are sent into the cleaning box through the pipeline 2 to the cleaning box, and the medicine preparation is stopped when the medicine concentration in the system reaches the cleaning requirement. During this period, the purge pump recirculation valve 9 may be opened and recirculated through the purge pump recirculation line 8, if desired, to provide a more rapid and stable drug concentration. After the pickling is started, sampling and testing are carried out according to the specification requirements, the sampling valve 45 is opened, and sampling and testing are carried out through the sampling pipeline 44. Adjusting a demineralized water replenishing valve 54 according to the water quantity requirement during acid washing to replenish water; the steam heat source valve 56 is adjusted according to the temperature requirement to supplement the steam heat source. And when the test index meets the requirement, preparing to finish pickling.
And after the acid washing is finished, carrying out a water washing step after the acid washing. Closing the steam heat source valve 56, opening the demineralized water replenishing valve 54, opening the liquid return valve 43, closing the recirculation valve 49, ejecting the acid liquor by using the demineralized water, and discharging the waste liquid to the wastewater tank 52 according to the flow of the cleaning tank 3 → the outlet pipeline 4 → the liquid inlet main pipe 10 → the low-pressure economizer liquid inlet pipeline 15/the low-pressure evaporator liquid inlet pipeline 18 → the low-pressure economizer 17/the low-pressure evaporator 20 → the low-pressure steam pocket 21 → the low-pressure steam pocket liquid return pipeline 22 → the liquid return main pipe 42 → the wastewater tank 52. During the flushing process, the sampling valve 45 is opened and sampling and testing are performed through the sampling pipe 44. When the rinsing reaches the standard, the washing machine is ready for rinsing and passivation. The monitor tube inlet valve 11 and the monitor tube outlet valve 14 are closed, flanges connected to both ends of the monitor tube 13 are removed, the indicator piece installed in the monitor tube 13 is taken out, and the corrosion rate is measured by the indicator piece. The inside of the monitoring tube was observed for cleaning effect and then returned. The monitor tube inlet valve 11 and the monitor tube outlet valve 14 are opened.
And after the water washing is finished after the acid washing, rinsing and passivating. The recirculation valve 49 is opened, the liquid return valve 43 is closed, circulation is established, the steam heat source valve 56 is opened, when the temperature in the system rises to a required temperature, the steam heat source valve 56 is closed, the medicines are prepared in the medicine preparation tank 1, and the medicines are conveyed into the cleaning tank 3 through the pipeline 2 to the cleaning tank. During this period, the purge pump recirculation valve 9 may be opened and recirculated through the purge pump recirculation line 8, if desired, to provide a more rapid and stable drug concentration. The sampling valve 45 is opened and assayed, and a timer is timed when the concentration of the drug in the system reaches the rinse and passivation requirements. After circulating for about 2h, rinsing and passivation are completed.
After rinsing and passivation are complete, a drain step is performed. The cleaning pump 6 is stopped, the liquid return valve 43 is opened, the liquid inlet main pipe discharge valve 51 is opened, and the waste liquid in the system is discharged to the waste water tank 52 through the liquid return main pipe 42, the liquid return valve 43, the liquid inlet main pipe 10 and the liquid inlet main pipe discharge pipeline 50 and the liquid inlet main pipe discharge valve 51.
Each step in the cleaning process is simple and safe to operate, the cleaning process is stable, the system response is rapid, and the requirements of the chemical cleaning process are met.
Claims (7)
1. A chemical cleaning system for a boiler is characterized by comprising a cleaning unit, a low-pressure system unit, a medium-pressure system unit and a high-pressure system unit;
the cleaning system unit comprises a dosing tank (1), an outlet of the dosing tank (1) is connected with a cleaning tank (3) through a pipeline (2) to the cleaning tank, an outlet of the cleaning tank (3) is connected with an outlet main pipe (4), and a cleaning tank outlet valve (5), a cleaning pump (6) and a cleaning pump outlet valve (7) are sequentially installed on the outlet main pipe (4);
an outlet main pipe (4) behind the cleaning pump outlet valve (7) is divided into two branches, one branch is connected to the cleaning box (3) through a cleaning pump recirculation pipeline (8), a cleaning pump recirculation valve (9) is installed on the cleaning pump recirculation pipeline (8), the other branch is sequentially connected to a low-pressure system, a medium-pressure system and a high-pressure system through a liquid inlet main pipe (10), and finally the cleaning unit is returned through a liquid return main pipe (42).
2. A chemical cleaning system for boiler according to claim 1, characterized in that said liquid return main pipe (42) comprises two branches, one branch is connected with waste water tank (52) through liquid return valve, the other branch is connected with outlet main pipe (4) through recirculation valve (49), said liquid return main pipe (42) is installed with sampling pipe (44), said sampling pipe (44) is installed with sampling valve (45); the liquid return main pipe (42) is provided with a rainwater well pipeline (46), and the rainwater well pipeline (46) is provided with a rainwater well valve (47).
3. A chemical cleaning system for boiler as claimed in claim 1, wherein a monitor tube inlet valve (11), a monitor tube flowmeter (12), a monitor tube (13), and a monitor tube outlet valve (14) are connected in sequence between said liquid inlet main (10) and liquid return main (42).
4. A chemical cleaning system for boiler according to claim 1, characterized in that the top of the cleaning tank (3) is connected with a demineralized water replenishing pipeline (53), the demineralized water replenishing pipeline (53) is provided with a demineralized water replenishing valve (54), the top of the cleaning tank (3) is connected with a steam heat source pipeline (55), and the steam heat source pipeline (55) is provided with a steam heat source valve (56).
5. The chemical cleaning system for the boiler according to the claim 1, characterized in that the low pressure system unit comprises a low pressure economizer liquid inlet pipe (15) connected with a liquid inlet main pipe (10), a low pressure economizer liquid inlet valve (16) is installed on the low pressure economizer liquid inlet pipe (15), the liquid inlet main pipe (10) is connected with a low pressure evaporator liquid inlet pipe (18), a low pressure economizer liquid inlet valve (19) is installed on the low pressure evaporator liquid inlet pipe (18), the low pressure economizer liquid inlet pipe (15) is connected to a low pressure economizer (17), the low pressure evaporator liquid inlet pipe (18) is connected to a low pressure evaporator (20), the low pressure economizer (17) and the low pressure evaporator (20) are both connected to a low pressure steam pocket (21), the low pressure steam pocket (21) is connected with a liquid return pipe (42) through a low pressure steam pocket liquid return pipe (22), and a low-pressure steam drum liquid return valve (23) is arranged on the low-pressure steam drum liquid return pipeline (22).
6. A chemical cleaning system for boiler according to claim 1, characterized in that said medium pressure system unit comprises a medium pressure economizer liquid inlet pipe (24) connected to a liquid inlet main pipe (10), said medium pressure economizer liquid inlet pipe (24) is installed with a medium pressure economizer liquid inlet valve (25), said liquid inlet main pipe (10) is connected to a medium pressure evaporator liquid inlet pipe (27), said medium pressure evaporator liquid inlet pipe (27) is installed with a medium pressure economizer liquid inlet valve (28), said medium pressure economizer liquid inlet pipe (24) is connected to a medium pressure economizer (26), said medium pressure evaporator liquid inlet pipe (27) is connected to a medium pressure evaporator (29), said medium pressure economizer (26) and medium pressure evaporator (29) are both connected to a medium pressure steam pocket (30), said medium pressure steam pocket (30) is connected to a liquid return pipe (42) through a medium pressure steam pocket liquid return pipe (31), and a medium-pressure steam drum liquid return valve (32) is arranged on the medium-pressure steam drum liquid return pipeline (31).
7. The chemical cleaning system for the boiler according to claim 1, wherein the high-pressure system unit comprises a high-pressure economizer liquid inlet pipeline (33) connected with a liquid inlet main pipe (10), a high-pressure economizer liquid inlet valve (34) is installed on the high-pressure economizer liquid inlet pipeline (33), the liquid inlet main pipe (10) is connected with a high-pressure evaporator liquid inlet pipeline (36), a high-pressure economizer liquid inlet valve (37) is installed on the high-pressure evaporator liquid inlet pipeline (36), the high-pressure economizer liquid inlet pipeline (33) is connected to a high-pressure economizer (35), the high-pressure evaporator liquid inlet pipeline (36) is connected to a high-pressure evaporator (37), the high-pressure economizer (35) and the high-pressure evaporator (38) are both connected to a high-pressure steam pocket (39), and the high-pressure steam pocket (39) is connected with a liquid return pipeline (42) through a high-pressure steam pocket liquid return pipeline (40), and a high-pressure steam drum liquid return valve (41) is arranged on the high-pressure steam drum liquid return pipeline (40).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121308448.1U CN215570393U (en) | 2021-06-11 | 2021-06-11 | Boiler chemical cleaning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121308448.1U CN215570393U (en) | 2021-06-11 | 2021-06-11 | Boiler chemical cleaning system |
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| Publication Number | Publication Date |
|---|---|
| CN215570393U true CN215570393U (en) | 2022-01-18 |
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ID=79816702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121308448.1U Active CN215570393U (en) | 2021-06-11 | 2021-06-11 | Boiler chemical cleaning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215570393U (en) |
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2021
- 2021-06-11 CN CN202121308448.1U patent/CN215570393U/en active Active
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