CN109442380B - Boiler water supply control and waste heat recovery and deoxidization method - Google Patents
Boiler water supply control and waste heat recovery and deoxidization method Download PDFInfo
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- CN109442380B CN109442380B CN201811223854.0A CN201811223854A CN109442380B CN 109442380 B CN109442380 B CN 109442380B CN 201811223854 A CN201811223854 A CN 201811223854A CN 109442380 B CN109442380 B CN 109442380B
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- water
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- water tank
- boiler
- pump
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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
Abstract
The invention discloses a method for controlling boiler water supply, recovering waste heat and deoxidizing, wherein a high water tank is arranged at a position higher than a secondary waste heat recoverer. The high water tank and the boiler barrel are respectively provided with a water level sensor, the outlets of the low water tank and the air preheater are provided with temperature sensors, and a deaerator is arranged between the high water tank and the low water tank. A flow meter is arranged on a pipeline between a water outlet of the high water tank and a water inlet of the secondary waste heat recoverer; flue gas enters the upper part of a secondary waste heat recoverer (enters the secondary waste heat recoverer from an inlet between the primary waste heat recoverer and a low water tank) after coming out of the primary waste heat recoverer, performs countercurrent heat exchange with boiler feed water, and is discharged from a lower smoke outlet; the water supplement entering the high water tank automatically flows into the secondary waste heat recoverer to exchange heat with the flue gas, and water-soluble oxygen escapes along with the increase of the temperature, is discharged into the oxygen discharge pipe inserted into the high water tank through the deaerator, and is emptied after the water level resistance of the high water tank is overcome. The utilization rate of energy is improved.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a method for controlling boiler water supply, recovering waste heat and deoxidizing.
Background
The boiler has obtained extensive use in the life production, current boiler is in the use, boiler feedwater uses the position formula control, and only obey boiler drum water level signal, the heat in the flue gas can not be fine is retrieved, the heat in the flue gas is most discharged to the air through the chimney, make these heat loss extravagant, not only make the energy waste serious, the pollution of environment has been caused, and simultaneously, because steam deaerator working costs is high, most boilers do not need the deaerator, the water soluble oxygen in the feedwater gets into the boiler, the corruption of boiler has been accelerated. The present invention provides an economical method of oxygen removal.
Disclosure of Invention
The invention aims to provide a boiler water supply control and waste heat recovery and oxygen removal method which can recycle heat in flue gas and reduce manual investment.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for controlling boiler water supply, recovering waste heat and deoxidizing comprises the following steps:
respectively mounting water level sensors on a high water tank and a boiler barrel, mounting temperature sensors at outlets of a low water tank and an air preheater, mounting a flowmeter on a pipeline between a water outlet of the high water tank and a water inlet of a secondary waste heat recoverer, respectively setting a lower limit alarm and a lower limit alarm of the high water tank, respectively supplementing water by a lower limit alarm water supplementing pump, and supplementing water by a lower limit alarm water supplementing pump and a standby pump; the alarm is relieved, and water supplement is stopped; respectively setting an upper limit alarm, a lower limit alarm and a lower limit alarm of a boiler barrel, after a controller is powered on, pressing a boiler start key, automatically inspecting the boiler, when the lower limit alarm of the water level of the boiler is carried out, a boiler combustion device does not operate, a variable-frequency water feed pump and a power-frequency water feed pump operate simultaneously, the lower limit alarm of the water level of the boiler is relieved, and the boiler combustion device is put into operation; when the lower limit of the boiler water level is alarmed, the variable-frequency and power-frequency water-feeding pump is operated, the alarm of the lower limit of the boiler water level is relieved, and the power-frequency water-feeding pump is stopped; when the upper limit of the water level of the drum alarms, the variable frequency pump stops running;
secondly, the flue gas enters the upper part of the secondary waste heat recoverer to wash the heat exchange tube downwards after coming out of the primary waste heat recoverer, carries out countercurrent flow heat exchange with boiler feed water, is discharged from a lower smoke outlet, condensate drips from top to bottom from the outside of a pipe of the secondary waste heat recoverer, and is discharged from a water discharge port;
thirdly, feeding water into a power frequency pump or a variable frequency pump through a high water tank, a flowmeter, a secondary waste heat recoverer and a low water tank, and feeding the water into a boiler barrel through a primary waste heat recoverer or a bypass regulating valve; simultaneously, water-soluble oxygen escapes from the pipeline of the secondary waste heat recoverer to enter the low water tank, enters the deaerator from the upper part of the low water tank and is emptied from the oxygen exhaust pipe inserted into the water in the high water tank; scale is generated in the secondary waste heat recoverer pipe, part of the scale enters the low-level water tank, and the scale is discharged from a sewage discharge outlet after being precipitated;
or enters a power frequency pump or a variable frequency pump through a high water tank and a flowmeter, and enters a drum through a primary waste heat recoverer or a bypass regulating valve;
fourthly, the deoxygenation temperature is jointly controlled by the primary waste heat recoverer and the bypass regulating valve by changing the water supply flowing through the primary waste heat recoverer, and the set temperature is 100-;
and fifthly, arranging a three-way bypass on the low-level water tank, wherein one way bypass is connected with a water outlet of the secondary waste heat recoverer, the other way bypass is connected with preheated air, the other way bypass is connected with a power frequency pump and a frequency conversion pump, the controller controls the preheated air circulating pump to drive hot water preheated air of the secondary waste heat recoverer, and the temperature is set to be 5-10 ℃ less than the deoxygenation temperature.
In the third step, when the feed water enters the power frequency pump or the variable frequency pump through the high water tank, the flow meter, the secondary waste heat recoverer and the low water tank, the first valve is closed, and the second valve and the third valve are opened.
In the third step, the feed water passes through the high water tank and the flowmeter, the first valve is opened, the second valve and the third valve are closed, and the water enters the industrial frequency pump or the variable frequency pump and enters the boiler barrel through the primary waste heat recoverer or the bypass regulating valve.
As a preferred embodiment, when the high water tank is used for replenishing water, a high water tank water level signal is read, a relay is closed when the lower limit alarms, a water replenishing pump operates to add water to the high water tank, a standby water replenishing pump relay is closed when the lower limit alarms, the standby water replenishing pump is started to replenish water, and manual starting is arranged on the standby water replenishing pump and the water replenishing pump.
As a preferred embodiment, the operation of the variable frequency pump is controlled according to three impulses, wherein the three impulses comprise boiler steam flow data, boiler water level data and boiler feed water flow data, and the variable frequency pump and the industrial frequency pump can be manually started.
The beneficial effects obtained by adopting the technical scheme are as follows: the automatic feedwater and the moisturizing work of boiler have been accomplished, have reduced artifical input, and degree of automation is high moreover, have improved work efficiency, and the sensible heat and the latent heat in the flue gas carry out abundant recycle moreover, have improved the utilization ratio of energy, have practiced thrift the energy, have improved the utilization ratio of the energy.
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, and 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 these drawings without creative efforts.
FIG. 1 is a schematic control flow diagram of the present invention;
FIG. 2 is a schematic view of the control flow of replenishing water to the high water tank according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention is further described with reference to the accompanying drawings, so that the technical personnel in the technical field can better implement the invention, and the invention implements a boiler water supply control and waste heat recovery and oxygen removal method, which comprises the following steps: respectively installing water level sensors on a high water tank and a boiler barrel, installing temperature sensors at outlets of a low water tank and an air preheater, installing a flowmeter on a pipeline between a water outlet of the high water tank and a water inlet of a secondary waste heat recoverer, and respectively setting water replenishing levels of a lower limit alarm water replenishing pump and a lower limit alarm standby pump of the high water tank; respectively setting an upper limit alarm, a lower limit alarm and a lower limit alarm of the boiler barrel, and after the controller is powered on, pressing down a power frequency pump to start or when the boiler operates the boiler and the water level lower limit alarm is given, operating the power frequency pump; when the lower limit of the boiler water level alarms, the boiler stops running, and when the upper limit of the boiler water level alarms, the variable frequency pump runs; secondly, the flue gas enters an inlet between a secondary waste heat recoverer and a low water tank after coming out of the primary waste heat recoverer, enters the secondary waste heat recoverer and performs countercurrent heat exchange with boiler feed water, is discharged from a lower smoke outlet, and condensate drips from the outside of a pipe of the secondary waste heat recoverer from top to bottom and is discharged from a water outlet; thirdly, the feed water passes through a high water tank, a flow meter, a secondary waste heat recoverer and a low water tank, at the moment, the first valve is closed, the second valve and the third valve are opened, and the water enters a power frequency pump or a variable frequency pump and enters a boiler barrel through the primary waste heat recoverer or a bypass regulating valve; or through the high water tank and the flowmeter, at the moment, the first valve is opened, the second valve and the third valve are closed, water enters the power frequency pump or the variable frequency pump, and enters the boiler barrel through the primary waste heat recoverer or the bypass regulating valve; meanwhile, the water-soluble oxygen escapes into the low water tank through the pipeline of the secondary waste heat recoverer and is emptied from a deaerator at the upper part of the low water tank; scale is generated in the secondary waste heat recoverer pipe, part of the scale enters the low-level water tank, and the scale is discharged from a sewage discharge outlet after being precipitated; fourthly, the deoxygenation temperature is jointly controlled by the primary waste heat recoverer and the bypass regulating valve by changing the water supply flowing through the primary waste heat recoverer, and the set temperature is 100-; and fifthly, arranging a three-way bypass before the water inlet of the secondary waste heat recoverer, behind the water outlet and behind the water outlet of the low-level water tank, controlling a preheated air circulating pump by a controller to drive hot water preheated air of the secondary waste heat recoverer, and setting the temperature to be 5-10 ℃ less than the deoxygenation temperature.
When the high water tank is used for supplying water, a high water tank water level signal is read, the relay is closed when the lower limit alarms, the water pump runs to add water into the high water tank, the standby water replenishing pump relay is closed when the lower limit alarms, the standby water replenishing pump is started to replenish water, and the standby water pump and the water supply pump are manually started; the operation of the variable frequency pump is controlled according to three impulses, wherein the three impulses comprise boiler steam flow data, boiler water level data and boiler feed water flow data, and the variable frequency pump and the power frequency pump can be started manually.
The boiler water supply and supplement device automatically finishes the water supply and supplement work of the boiler, reduces the labor input, has high automation degree, improves the working efficiency, recycles the flue gas, is used for preheating the water in the lower water tank, improves the utilization rate of energy, recycles the vapor generated by the combustion of the fuel gas, saves the energy and improves the utilization rate of the energy.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (3)
1. A method for controlling boiler water supply, recovering waste heat and deoxidizing is characterized by comprising the following steps:
respectively mounting water level sensors on a high water tank and a boiler barrel, mounting temperature sensors at outlets of a low water tank and an air preheater, mounting a flowmeter on a pipeline between a water outlet of the high water tank and a water inlet of a secondary waste heat recoverer, respectively setting a lower limit alarm and a lower limit alarm of the high water tank, respectively supplementing water by a lower limit alarm water supplementing pump, and supplementing water by a lower limit alarm water supplementing pump and a standby pump; the alarm is relieved, and water supplement is stopped; respectively setting an upper limit alarm, a lower limit alarm and a lower limit alarm of a boiler barrel, after a controller is powered on, pressing a boiler start key, automatically inspecting the boiler, when the lower limit alarm of the water level of the boiler is carried out, a boiler combustion device does not operate, a variable-frequency water feed pump and a power-frequency water feed pump operate simultaneously, the lower limit alarm of the water level of the boiler is relieved, and the boiler combustion device is put into operation; when the lower limit of the boiler water level is alarmed, the variable-frequency and power-frequency water-feeding pump is operated, the alarm of the lower limit of the boiler water level is relieved, and the power-frequency water-feeding pump is stopped; when the upper limit of the water level of the drum alarms, the variable frequency pump stops running;
secondly, the flue gas enters the upper part of the secondary waste heat recoverer to wash the heat exchange tube downwards after coming out of the primary waste heat recoverer, carries out countercurrent flow heat exchange with boiler feed water, is discharged from a lower smoke outlet, condensate drips from top to bottom from the outside of a pipe of the secondary waste heat recoverer, and is discharged from a water discharge port;
thirdly, feeding water into a power frequency pump or a variable frequency pump through a high water tank, a flowmeter, a secondary waste heat recoverer and a low water tank, and feeding the water into a boiler barrel through a primary waste heat recoverer or a bypass regulating valve; simultaneously, water-soluble oxygen escapes from the pipeline of the secondary waste heat recoverer to enter the low water tank, enters the deaerator from the upper part of the low water tank and is emptied from the oxygen exhaust pipe inserted into the water in the high water tank; scale is generated in the secondary waste heat recoverer pipe, part of the scale enters the low-level water tank, and the scale is discharged from a sewage discharge outlet after being precipitated;
or enters a power frequency pump or a variable frequency pump through a high water tank and a flowmeter, and enters a drum through a primary waste heat recoverer or a bypass regulating valve;
fourthly, the deoxygenation temperature is jointly controlled by the primary waste heat recoverer and the bypass regulating valve by changing the water supply flowing through the primary waste heat recoverer, and the deoxygenation temperature is set to be 100 plus 105 ℃;
and fifthly, arranging a three-way bypass on the low-level water tank, wherein one way bypass is connected with a water outlet of the secondary waste heat recoverer, the other way bypass is connected with preheated air, the other way bypass is connected with a power frequency pump and a frequency conversion pump, a controller controls a preheated air circulating pump to drive hot water preheated air of the secondary waste heat recoverer, and the temperature of the hot water preheated air is set to be 5-10 ℃ less than the deoxidizing temperature.
2. The boiler feed water control and waste heat recovery and oxygen removal method according to claim 1, characterized in that: when high water tank moisturizing, read high water tank water level signal, the relay is closed during the lower limit is reported to the police, and the moisturizing pump operation adds water to high water tank, and reserve moisturizing pump relay is closed during the lower limit is reported to the police, starts reserve moisturizing pump and carries out the moisturizing, is provided with manual start on reserve moisturizing pump and the moisturizing pump.
3. The boiler feed water control and waste heat recovery and oxygen removal method according to claim 2, characterized in that: the operation of the variable frequency pump is controlled according to three impulses, wherein the three impulses comprise boiler steam flow data, boiler water level data and boiler feed water flow data, and the variable frequency pump and the power frequency pump can be started manually.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811223854.0A CN109442380B (en) | 2018-10-19 | 2018-10-19 | Boiler water supply control and waste heat recovery and deoxidization method |
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| CN201811223854.0A CN109442380B (en) | 2018-10-19 | 2018-10-19 | Boiler water supply control and waste heat recovery and deoxidization method |
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| CN109442380A CN109442380A (en) | 2019-03-08 |
| CN109442380B true CN109442380B (en) | 2021-03-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3659659B2 (en) * | 1993-09-14 | 2005-06-15 | 三菱重工業株式会社 | Exhaust gas boiler |
| CN102072480B (en) * | 2010-12-30 | 2013-07-17 | 中国恩菲工程技术有限公司 | Three-impulse control system of waste heat boiler drum water level |
| CN202382224U (en) * | 2011-12-28 | 2012-08-15 | 王洪彬 | Boiler flue gas waste-heat recovery system |
| CN204667218U (en) * | 2015-04-09 | 2015-09-23 | 广州市劲业节能技术有限公司 | A kind of frequency conversion temperature-control energy-saving control system |
| CN204593428U (en) * | 2015-04-27 | 2015-08-26 | 董骏鹏 | Boiler low-temperature fume waste-heat recovery device |
| CN107940439A (en) * | 2017-10-25 | 2018-04-20 | 河南中烟工业有限责任公司 | A kind of boiler smoke heat energy recycling system |
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Effective date of registration: 20230801 Address after: No. 279, Shengli East Street, Kuiwen District, Weifang, Shandong Province 261041 Patentee after: Wang Dejian Address before: 261000 Room 501, unit 2, building 3, 299 Wenhua Road, Kuiwen District, Weifang City, Shandong Province Patentee before: Wang Lin |