CN110454768B - Method for prolonging service life of boiler water supply system - Google Patents
Method for prolonging service life of boiler water supply system Download PDFInfo
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- CN110454768B CN110454768B CN201910715966.6A CN201910715966A CN110454768B CN 110454768 B CN110454768 B CN 110454768B CN 201910715966 A CN201910715966 A CN 201910715966A CN 110454768 B CN110454768 B CN 110454768B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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Abstract
The invention discloses a method for prolonging the service life of a boiler water supply system, which comprises the following steps: (1) the height of an effective water seal pipe designed by the deaerator is increased, the operating pressure and temperature of deaerated steam are improved, and the operating condition of the deaerator is ensured to be met; (2) a deaerator secondary steam source is additionally arranged, and when the load of a boiler is low or the working condition is unstable, low-pressure auxiliary steam is added for deaerating to ensure the deaerating effect; (3) the original adjusting mode of the water supply deoxygenation steam is changed, an automatic pressure reduction adjusting control valve is added, the real-time monitoring and automatic adjustment of the deoxygenation effect are realized, the pressure and temperature stability of the deoxygenator is ensured, and the deoxygenation effect is ensured; (4) the temperature of the water supply of the deaerator is improved, the condensed water on the side of the steam turbine is directly led to the DN50 water replenishing port of the deaerator, and the burden of deaerating is reduced. The invention solves the problem that the oxygen content of the water supply system exceeds the standard for a long time, eliminates the hidden danger that the deaerator is frequently punctured to hurt people, ensures the long-period healthy operation of the boiler, and improves the generating capacity of the matched unit.
Description
Technical Field
The invention relates to a method for prolonging the service life of a boiler water supply system, belonging to the field of water supply deoxidization systems.
Background
At present, the deaerator of the waste heat boiler of the Tai steel CDQ dry quenching 1 and 2# is designed to be an atmospheric deaerator, and after 2008 putting into production, the oxygen content of the feed water of the waste heat boiler of the CDQ dry quenching 1 and 2# runs in a state of 50-100 mu g/L for a long time, so that the oxygen corrosion of a boiler feed water system and a heating surface is caused, especially the corrosion of a light pipe section of an elbow and a straight pipe of a low-temperature economizer is accelerated, and the long-period safe and stable running of a boiler feed water pipeline and the economizer is seriously influenced.
The reason was analyzed as follows:
(1) the south district oxygen-eliminating device of CDQ is from the time of the delivery, and manual adjustment always, manual adjustment's result is that the oxygen-eliminating device pressure fluctuation is big, can not guarantee the steady operation of oxygen-eliminating device pressure, and then causes the deoxidization temperature fluctuation, and the deoxidization is not up to standard. (2) The deoxidization of atmospheric oxygen-eliminating device must guarantee pressure and temperature stability, in order to reach better deoxidization effect, just must improve the temperature and the pressure of oxygen-eliminating device, but oxygen-eliminating device water-sealed pipe is highly not enough, and when raising pressure, the oxygen-eliminating device just often punctures. The water seal height of the two deaerators before transformation is 2.6 meters, the normal operating pressure of the deaerators is 0.02-0.023 MPa, and when the operating pressure of the 1# deaerator is 0.023MPa, the qualified deaerator is in the fluctuation of 30 ug/l. The analysis pressure and temperature are at critical values and increasing the operating pressure will entail a risk of breakthrough in order to ensure the oxygen scavenging effect. (3) Through inquiry drawing, data, investigation and the like, another reason that preliminary analysis deoxidization of deoxidization is unqualified is that current deoxidization vapour source is not enough, sets up in deoxidization water tank upper portion end cap and originally for the supplementary deoxidization of secondary, from the oxygen-eliminating device and puts into operation, because here does not have the vapour source, causes the function of secondary degree of depth deoxidization to lack. (4) The adjustment and distribution of the existing three auxiliary steam sources of the deaerator are not coordinated, and the deaerator has poor deaerating effect due to excessive steam quantity or insufficient steam quantity. (5) A water source of the deaerator is condensed water from a steam turbine, the condensed water firstly enters an intermediate water tank and then is pumped into the deaerator through a pump, the temperature loss is 5-10 ℃ through data observation, the deaerator is unqualified in deaerator due to the fact that the deaerator is burdened by analyzing the high-load condition, and the heat of the condensed water is lost from the energy-saving angle.
Therefore, the optimization and transformation of the steam supply structure and the steam supply mode of the deaerator can reduce the oxygen content of the feed water, and the optimization and transformation of the steam supply structure and the feed water mode is an important link for ensuring the stable operation of the boiler.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a method for prolonging the service life of a boiler water supply system, effectively improves the deoxidization index of a boiler and achieves the aim of prolonging the service life of the boiler water supply system.
The invention provides a method for prolonging the service life of a boiler water supply system, which comprises the following steps:
(1) the height of an effective water seal pipe designed by the deaerator is increased, the operating pressure and temperature of deaerated steam are improved, and the operating condition of the deaerator is ensured to be met;
(2) a deaerator secondary steam source is additionally arranged, and when the load of a boiler is low or the working condition is unstable, low-pressure auxiliary steam is added for deaerating to ensure the deaerating effect;
(3) the original adjusting mode of the water supply deoxygenation steam is changed, an automatic pressure reduction adjusting control valve is added, the real-time monitoring and automatic adjustment of the deoxygenation effect are realized, the pressure and temperature stability of the deoxygenator is ensured, and the deoxygenation effect is ensured;
(4) the temperature of the water supply of the deaerator is improved, the condensed water on the side of the steam turbine is directly led to the DN50 water replenishing port of the deaerator, and the burden of deaerating is reduced.
In the method, the height of a water seal pipe of the deaerator is increased by 600mm, the straight pipe section of the original U-shaped bent bottom of the water seal is increased by 300mm, the total height of the water seal is increased to 3.2 meters, and the optimal height is achieved; when the water seal height is increased by 100mm, the steam pressure is increased by 0.01 MPa; the operation pressure can be improved from original 0.02-0.023 MPa to 0.023-0.25 MPa in operation adjustment, and the operation pressure fluctuates by 0.05MPa due to the rhythm of production characteristics in operation, at the moment, the deoxidization index is reduced from original 30ug/l to 20ug/l, the effect is improved by about 30%, and more importantly, the safe operation of the system can be ensured under the height.
According to the method, the secondary deoxygenation steam source is added in the deoxygenation water tank to achieve low-pressure auxiliary steam deoxygenation, adjustment modes of different steam sources are reasonably optimized, and after practical research and analysis are combined, the low-pressure steam of a pipe network is communicated with the deaerator through a plug on the deaerator, so that the problem of repeated fluctuation of the deaerator under the operation condition is solved. Firstly, stopping running three times of steam sources, and reasonably adjusting the steam sources of the first time, the second time and the third time of reboiling; secondly, slightly opening a deaerator to assist in heating the steam manual valve for 1-2 circles; and finally, slowly opening a deaerator low-pressure auxiliary heating steam main door to preheat the pipeline, gradually and completely opening the steam main door after 5-10 minutes, and adjusting the steam main door through two doors.
And adjusting the opening of the deaerator auxiliary secondary heating steam hand according to the temperature of the deaerator until the temperature of the deaerator is not lower than 104 ℃, and recording the opening position of the valve. The opening of the bottom reboiling heating valve is mainly based on the water temperature of the water tank, and the bottom reboiling heating valve is properly opened when the temperature is lower than 104 ℃. The opening degree of a steam valve is determined by adjusting and recording the opening degree of the steam source and the temperature, pressure and oxygen removal effect of the water tank every time, the opening degree of the empirical steam source valve is finally reached, the routine adjustment of operation is guided, and an adjustment principle and a standard are worked out.
According to the method, the steam supply structure and the adjustment mode of the deaerator are improved, the adjustment mode of the steam for water supply and deaerating is optimized, the original adjustment mode is purely manual adjustment, a steam source is quite unstable, an automatic pressure reduction adjustment control valve is added after the deaerator is modified, the automatic adjustment of the deaerating effect is monitored in real time, the pressure and the temperature of the deaerator are stable, and the deaerating effect is guaranteed.
In the method, the temperature of the feeding water of the deaerator is increased to 40-60 ℃, the condensed water on the steam turbine side is directly led to the DN50 water replenishing port of the deaerator, the water inlet temperature of the deaerator at a deaerator head under high load is ensured, and the deaerator is promoted to efficiently deaerate.
In the method, the bottom reboiling heating device is arranged at the bottom of the deaerator, so that the effluent temperature of the water tank reaches the standard and is deeply deaerated, and a better deaerating effect is achieved by adjusting the opening of the reboiling steam valve.
The invention has the beneficial effects that:
(1) before the project is implemented: the index of the oxygen content of the feed water of the CDQ dry quenching No. 1 waste heat boiler is 50ug/L for a long time; the oxygen content index of the water supply of the CDQ dry quenching 2# waste heat boiler is between 20 and 30ug/L for a long time; after implementation, the target is achieved: the oxygen content of the feed water of the CDQ dry quenching No. 1 waste heat boiler is less than or equal to 15 ug/L; the oxygen content of the water supply of the CDQ dry quenching 2# waste heat boiler is less than or equal to 15 ug/L.
(2) The problem that the oxygen content of a water supply system exceeds the standard for a long time is solved, the hidden danger that a deaerator is frequently punctured to hurt people is eliminated, the oxygen corrosion rate of an economizer and a water supply pipeline is slowed down, the long-period healthy operation of a boiler is ensured, the service lives of the water supply system and the boiler are prolonged, the steam production of the boiler is stabilized, and the generating capacity of a matched unit is improved.
(3) The prediction totals the direct and indirect economic benefits each year:
firstly, blowing out loss benefit: 2 pieces 50h 70t/h 240kwh/t 0.42 yuan =70.56 ten thousand yuan (calculated according to 50h fault time, each furnace according to 70t/h, the unit ton steam generating capacity according to 240 degrees, the price of electricity according to 0.42 yuan)
② the economic benefit =150 ten thousand yuan depreciation 0.2 =30 ten thousand yuan brought by the prolonging of the service life of the equipment
Thirdly, estimating the cost of maintenance work materials: 2 ten thousand =10 ten thousand yuan 5 times
(ii) (+ 2 + c = in total: 110.56 ten thousand yuan/year.
Drawings
FIG. 1 is a process flow diagram of the extension of the service life of a boiler feedwater system of example 1.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
Example 1:
the scheme of the invention is implemented by improving the steam supply structure and the steam supply mode of the deaerator of the Tai steel CDQ dry quenching 1 and 2# waste heat boilers. Before the project is implemented: the index of the oxygen content of the feed water of the CDQ dry quenching No. 1 waste heat boiler is 50ug/L for a long time; the oxygen content index of the water supply of the CDQ dry quenching 2# waste heat boiler is between 20 and 30ug/L for a long time.
(1) The height of a water seal pipe of the deaerator is increased by 600mm, the straight pipe section at the bottom of the original water seal U-shaped bend is increased by 300mm, the total height of the water seal is increased to 3.2 m, and the height at the moment is optimal; when the water seal height is increased by 100mm, the steam pressure is increased by 0.01 MPa; the operation pressure can be improved from original 0.02-0.023 MPa to 0.023-0.25 MPa in operation adjustment, and the operation pressure fluctuates by 0.05MPa due to the rhythm of production characteristics in operation, at the moment, the deoxidization index is reduced from original 30ug/l to 20ug/l, the effect is improved by about 30%, and more importantly, the safe operation of the system can be ensured under the height.
(2) The deoxidization water tank increases the secondary deoxidization steam source and realizes the supplementary steam deoxidization of low pressure, rationally optimizes the adjustment mode of different steam sources, combines actual research analysis after, utilizes the end cap on the oxygen-eliminating device with pipe network low pressure steam rather than UNICOM, has eliminated the problem of fluctuation repeatedly under the oxygen-eliminating device operating condition. Firstly, stopping running three times of steam sources, and reasonably adjusting the steam sources of the first time, the second time and the third time of reboiling; secondly, slightly opening a deaerator to assist in heating the steam manual valve for 1-2 circles; and finally, slowly opening a deaerator low-pressure auxiliary heating steam main door to preheat the pipeline, gradually and completely opening the steam main door after 5-10 minutes, and adjusting the steam main door through two doors.
(3) And adjusting the opening of the deaerator auxiliary secondary heating steam hand according to the temperature of the deaerator until the temperature of the deaerator is not lower than 104 ℃, and recording the opening position of the valve. The opening of the bottom reboiling heating valve is mainly based on the water temperature of the water tank, and the bottom reboiling heating valve is properly opened when the temperature is lower than 104 ℃. The opening degree of a steam valve is determined by adjusting and recording the opening degree of the steam source and the temperature, pressure and oxygen removal effect of the water tank every time, the opening degree of the empirical steam source valve is finally reached, the routine adjustment of operation is guided, and an adjustment principle and a standard are worked out.
(4) The steam supply structure and the adjustment mode of the deaerator are improved, the steam supply and deaerating adjustment mode is optimized, the original adjustment mode is pure manual adjustment, a steam source is quite unstable, an automatic pressure reduction adjustment control valve is added after transformation, the real-time monitoring and automatic adjustment of the deaerating effect are realized, the pressure and the temperature of the deaerator are stable, and the deaerating effect is guaranteed.
(5) The temperature of the feeding water of the deaerator is increased to 40-60 ℃, the condensed water at the side of the steam turbine is directly led to a water replenishing port of the deaerator DN50, the water inlet temperature of a deaerator head of the deaerator under high load is ensured, and the deaerator is enabled to efficiently deaerate.
After implementation, the target is achieved: the oxygen content of the feed water of the CDQ dry quenching No. 1 waste heat boiler is less than or equal to 15 ug/L; the oxygen content of the water supply of the CDQ dry quenching 2# waste heat boiler is less than or equal to 15 ug/L.
The technological process is shown in figure 1 and comprises a first deaerator and a second deaerator, wherein the two deaerators are in a parallel structure, bottom reboiling heating devices are arranged at the bottoms of the two deaerators, and the bottoms of the deaerators are respectively connected with a water feeding pump; and a low-pressure auxiliary heating steam door is respectively arranged above the two deaerators, the upper part of the low-pressure auxiliary heating steam door is connected with the main pipeline, and the other end of the main pipeline is connected with a low-pressure gas pipe network.
Claims (7)
1. A method for extending the service life of a boiler feedwater system, comprising:
(1) the height of an effective water seal pipe designed by the deaerator is increased, the operating pressure and temperature of deaerated steam are improved, and the operating condition of the deaerator is ensured to be met;
increasing the height of a water seal pipe of the deaerator, increasing the height of the water seal by 600mm, increasing the original straight pipe section of the U-shaped bent bottom of the water seal by 300mm, and increasing the total height of the water seal to 3.2 meters; when the water seal height is increased by 100mm, the steam pressure is increased by 0.01 MPa;
(2) a deaerator secondary steam source is additionally arranged, and when the load of a boiler is low or the working condition is unstable, low-pressure auxiliary steam is added for deaerating to ensure the deaerating effect;
a secondary deoxygenation steam source, namely low-pressure auxiliary steam, is added in the deoxygenation water tank, and the low-pressure steam of the pipe network is communicated with the deoxygenation water tank by using a plug on the deoxygenator, so that the problem of repeated fluctuation under the operating condition of the deoxygenator is solved;
(3) the original adjusting mode of the water supply deoxygenation steam is changed, an automatic pressure reduction adjusting control valve is added, the real-time monitoring and automatic adjustment of the deoxygenation effect are realized, the pressure and temperature stability of the deoxygenator is ensured, and the deoxygenation effect is ensured;
(4) the temperature of the water supply of the deaerator is improved, the condensed water on the side of the steam turbine is directly led to the DN50 water replenishing port of the deaerator, and the burden of deaerating is reduced.
2. The method of extending the useful life of a boiler feed water system of claim 1, wherein: the operation pressure is 0.023-0.25 MPa.
3. The method of extending the useful life of a boiler feed water system of claim 1, wherein: firstly, stopping running three times of steam sources, and reasonably adjusting the steam sources of the first time, the second time and the third time of reboiling; secondly, slightly opening a deaerator to assist in heating the steam manual valve for 1-2 circles; and finally, slowly opening a deaerator low-pressure auxiliary heating steam main door to preheat the pipeline, gradually and completely opening the steam main door after 5-10 minutes, and adjusting the steam main door through two doors.
4. The method of extending the useful life of a boiler feed water system of claim 1, wherein: and adjusting the opening of an auxiliary secondary heating valve of the deaerator according to the temperature of the deaerator until the temperature of the deaerator is not lower than 104 ℃, recording the opening position of the valve, and properly opening the bottom reboiling heating valve when the water temperature of the water tank is lower than 104 ℃.
5. The method of extending the useful life of a boiler feed water system of claim 1, wherein: the adjusting mode of the water supply deoxygenation steam is as follows: the automatic pressure reduction adjustment control valve realizes the real-time monitoring and automatic adjustment of the deoxidizing effect.
6. The method of extending the useful life of a boiler feed water system of claim 1, wherein: the temperature of the feeding water of the deaerator is increased to 40-60 ℃, and the condensed water at the side of the steam turbine is directly led to a water replenishing port of the deaerator DN 50.
7. The method of extending the useful life of a boiler feed water system of claim 1, wherein: when the method is implemented, the bottom reboiling heating device is arranged at the bottom of the deaerator, so that the water outlet temperature of the water tank reaches the standard and is deeply deaerated, and a better deaerating effect is achieved by adjusting the opening degree of the reboiling steam valve.
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