CN110906312A - Condensing boiler drum liquid level control system with energy-saving technology - Google Patents
Condensing boiler drum liquid level control system with energy-saving technology Download PDFInfo
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- CN110906312A CN110906312A CN201911231990.9A CN201911231990A CN110906312A CN 110906312 A CN110906312 A CN 110906312A CN 201911231990 A CN201911231990 A CN 201911231990A CN 110906312 A CN110906312 A CN 110906312A
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- control system
- liquid level
- condensing boiler
- level control
- drum liquid
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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
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a condensing boiler drum liquid level control system with an energy-saving technology, which comprises a condensing boiler drum liquid level control system without a deaerator and a condensing boiler drum liquid level control system with the deaerator; the invention relates to a condensing boiler drum liquid level control system with an energy-saving technology, which provides solutions aiming at furnaces with deaerators and furnaces without deaerators to achieve an energy-saving effect; the energy-saving influence of the load change of a user on the drum liquid level control system is overcome; the heat loss of the exhaust gas temperature is effectively reduced; the problem of overheating of the soft water tank is effectively solved; the original unchanged pipeline connection mode is replaced by the mode that the electromagnetic valve switches the pipeline for controlling the furnace without the deaerator; aiming at the furnace type with the deoxygenator, a double-continuous frequency conversion water replenishing strategy is adopted, so that the problems of overheating temperature of the soft water tank, overhigh smoke exhaust temperature and the like are solved while the water supply continuity is ensured.
Description
Technical Field
The invention relates to the technical field of boiler energy-saving control, in particular to a condensing boiler drum liquid level control system with an energy-saving technology.
Background
The condensing boiler utilizes a high-efficiency flue gas condensation waste heat recovery device to absorb sensible heat in the exhaust smoke at the tail part of the boiler and latent heat released by water vapor condensation so as to achieve the purpose of improving the thermal efficiency of the boiler. In a traditional boiler, the exhaust gas temperature is generally 160-250 ℃, water vapor in the exhaust gas is still in an overheated state and cannot be condensed into liquid water to release latent heat of vaporization. As is well known, the thermal efficiency of a boiler is calculated by the lower heating value of fuel, and the heat loss of latent heat of vaporization in the upper heating value of fuel is not considered. Therefore, the heat efficiency of the traditional boiler can only reach 87 to 91 percent generally. The condensing waste heat recovery boiler reduces the temperature of the exhaust gas to 50-70 ℃, and fully recovers the sensible heat in the exhaust gas and the condensation latent heat of water vapor. The volume component of water vapor in the condensation waste heat recovery boiler flue gas taking natural gas as fuel is generally 15-19%, the water vapor content in the oil-fired boiler flue gas is 10-12%, and the water vapor content is far higher than that in the flue gas generated by a coal-fired boiler and is less than 6%.
The condensing boiler in the prior art mainly has the following problems:
1. the operation mode of the condenser and the energy saver of the existing condensing boiler can not solve the problems of high exhaust gas temperature or high temperature of the water softening tank, thus leading the energy consumption of a user to be increased and being incapable of effectively saving energy.
2. The existing water supply system cannot meet the energy-saving requirements of users under different loads.
Therefore, in view of the above technical problems, there is a need for a condensing boiler drum liquid level control system with energy saving technology.
Disclosure of Invention
In view of the above, the present invention provides a condensing boiler drum liquid level control system with energy saving technology, which provides solutions for both types of furnaces with deaerator and furnaces without deaerator to achieve energy saving effect; the energy-saving influence of the load change of a user on the drum liquid level control system is overcome; the heat loss of the exhaust gas temperature is effectively reduced; the problem of overheating of the soft water tank is effectively solved; the original unchanged pipeline connection mode is replaced by the mode that the electromagnetic valve switches the pipeline for controlling the furnace without the deaerator; aiming at the furnace type with the deoxygenator, a double-continuous frequency conversion water replenishing strategy is adopted, so that the problems of overheating temperature of the soft water tank, overhigh smoke exhaust temperature and the like are solved while the water supply continuity is ensured.
In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:
the utility model provides a condensing boiler drum liquid level control system with energy-conserving technique, condensing boiler is including the condensing boiler that does not contain the oxygen-eliminating device and the condensing boiler that contains the oxygen-eliminating device, boiler drum liquid level control system is including the condensing boiler drum liquid level control system that does not contain the oxygen-eliminating device and the condensing boiler drum liquid level control system that contains the oxygen-eliminating device, the condensing boiler that does not contain the oxygen-eliminating device is controlled by the condensing boiler drum liquid level control system that does not contain the oxygen-eliminating device, the condensing boiler that contains the oxygen-eliminating device is controlled by the condensing boiler drum liquid level control system that contains the oxygen-eliminating device.
As a further improvement of the invention, the condensing boiler without the deaerator comprises a soft water tank, a water feeding pump, a circulating pump, a condenser, an economizer and a boiler drum, the liquid level control system of the condensing boiler drum without the deaerator comprises a solenoid valve V1, a solenoid valve V2, a solenoid valve V3, a solenoid valve V4 and a solenoid valve V5, the solenoid valve V1 is connected between an inlet of the condenser and the circulating pump, the solenoid valve V2 is connected between an outlet of the condenser and the soft water tank, the solenoid valve V3 is connected between the inlet of the condenser and the water feeding pump, the solenoid valve V4 is connected between the outlet of the condenser and the inlet of the economizer, the solenoid valve V5 is connected between the inlet of the economizer and the water feeding pump, and the solenoid valves V1, V2 and V5 are interlocked with the circulating pump and the solenoid valve V3 and V46.
As a further improvement of the invention, the control mode of the boiler drum liquid level control system comprises a relay circuit, a single chip microcomputer or a decentralized control system.
As a further improvement of the invention, the condensing boiler with the deaerator comprises a soft water tank, a feed water pump, a deaerating water pump, a condenser, an energy saver, a deaerator and a boiler steam drum.
As a further improvement of the invention, the condensing boiler drum liquid level control system containing the deaerator comprises a deaerator liquid level feedback control system and a drum liquid level feedback control system.
As a further improvement of the invention, the deaerator liquid level feedback control system is used for controlling the variable frequency operation of a deaerating water pump, and the steam drum liquid level feedback control system is used for controlling the variable frequency operation of a water feeding pump.
The invention has the beneficial effects that: the invention relates to a condensing boiler drum liquid level control system with an energy-saving technology, which provides solutions aiming at furnaces with deaerators and furnaces without deaerators to achieve an energy-saving effect; the energy-saving influence of the load change of a user on the drum liquid level control system is overcome; the heat loss of the exhaust gas temperature is effectively reduced; the problem of overheating of the soft water tank is effectively solved; the original unchanged pipeline connection mode is replaced by the mode that the electromagnetic valve switches the pipeline for controlling the furnace without the deaerator; aiming at the furnace type with the deoxygenator, a double-continuous frequency conversion water replenishing strategy is adopted, so that the problems of overheating temperature of the soft water tank, overhigh smoke exhaust temperature and the like are solved while the water supply continuity is ensured.
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 described in 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 a condensing boiler drum level control system without a deaerator in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a condensate boiler drum level control system including a deaerator in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a condensing boiler drum liquid level control system with a deaerator in the prior art.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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.
In the various drawings of the present invention, certain dimensions of structures or portions are exaggerated relative to other structures or portions for ease of illustration and, therefore, are used only to illustrate the basic structure of the subject matter of the present invention.
Terms such as "left", "right", and the like, used herein to denote relative spatial positions, are used for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "to the right" of other elements or features would then be oriented "to the left" of the other elements or features. Thus, the exemplary term "right side" may encompass both left and right orientations. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Referring to fig. 1 to 2, in a specific embodiment of the present invention, a condensing boiler drum liquid level control system with an energy saving technology includes a condensing boiler without a deaerator and a condensing boiler with a deaerator, the boiler drum liquid level control system includes a condensing boiler drum liquid level control system without a deaerator and a condensing boiler drum liquid level control system with a deaerator, the condensing boiler without a deaerator is controlled by the condensing boiler drum liquid level control system without a deaerator, the condensing boiler with a deaerator is controlled by the condensing boiler drum liquid level control system with a deaerator, and the control mode of the boiler drum liquid level control system includes a relay circuit, a single chip microcomputer or a distributed control system.
Referring to fig. 1, the condensing boiler without the deaerator includes a soft water tank, a feed water pump, a circulation pump, a condenser, an economizer and a boiler drum, the condensing boiler drum liquid level control system without the deaerator includes a solenoid valve V1, a solenoid valve V2, a solenoid valve V3, a solenoid valve V4 and a solenoid valve V5, a solenoid valve V1 is connected between a condenser inlet and the circulation pump, a solenoid valve V2 is connected between a condenser outlet and the soft water tank, a solenoid valve V3 is connected between the condenser inlet and the feed water pump, a solenoid valve V4 is connected between the condenser outlet and the economizer inlet, a solenoid valve V5 is connected between the economizer inlet and the feed water pump, and solenoid valves V1, V2 and V5 are interlocked with the circulation pump and with the solenoid valve V3 and the solenoid valve V4.
The control strategy of the condensing boiler drum liquid level control system without the deaerator is as follows: the solenoid valve V1, the solenoid valve V2 and the solenoid valve V5 are interlocked with the circulating pump and are interlocked with the solenoid valve V3 and the solenoid valve V4;
when the load of a user is small, the electromagnetic valve V3 and the electromagnetic valve V4 are electrified, and the pipeline is used for connecting the condenser economizer in series and is connected with a water feeding pump for water supplement;
when the load of a user is large, the electromagnetic valve V1, the electromagnetic valve V2 and the electromagnetic valve V5 are electrified and the circulating pump is started in a linkage manner, at the moment, the pipeline is used for independently and independently operating the condenser energy saver, the condenser is connected with the circulating pump to circulate with the soft water tank, and the energy saver is connected with the water feeding pump to supplement water to the steam pocket.
According to the switching of the temperature control pipelines of the soft water tank, when the temperature of the soft water tank is lower than a set value, the electromagnetic valve V1, the electromagnetic valve V2, the electromagnetic valve V5 and the circulating pump work to raise the temperature of the water tank of the circulation condenser, and at the moment, the water supply pump is connected with the energy saver to supply water to the boiler steam drum; when the temperature of the soft water tank is more than or equal to a set value, the electromagnetic valve V3 and the electromagnetic valve V4 work, at the moment, the electromagnetic valve V1, the electromagnetic valve V2 and the electromagnetic valve V5 of the circulating pump stop working, and the water is supplemented to the water pump and enters a boiler steam drum through the energy saver of the condenser. According to the connection mode of the temperature control pipeline of the water softening tank, the problem that the temperature of the water softening tank is high and the problem that the exhaust gas temperature is high are solved.
Refer to fig. 2 and show, the condensing boiler who contains the oxygen-eliminating device includes softened water tank, feed pump, deoxidization water pump, condenser, energy-saving appliance, oxygen-eliminating device and boiler drum, condensing boiler drum liquid level control system who contains the oxygen-eliminating device includes oxygen-eliminating device liquid level feedback control system and drum liquid level feedback control system, oxygen-eliminating device liquid level feedback control system is used for controlling the frequency conversion operation of deoxidization water pump, drum liquid level feedback control system is used for controlling the frequency conversion operation of feed pump.
The control strategy of the condensing boiler drum liquid level control system containing the deaerator is as follows: the original mode of independent circulation of a circulating pump and a condenser is cancelled; and the deaerator liquid level is adopted to control the deaerator water pump to perform frequency conversion continuous water replenishing, and the steam drum liquid level is adopted to control the water pump to perform frequency conversion continuous water replenishing to perform integral continuous water replenishing strategy.
The liquid level of the boiler drum is reduced → the frequency of the feed pump is increased → the liquid level of the deaerator is reduced → the frequency of the deaerating water pump is increased, and the closed-loop liquid level control system has reliable continuity.
According to the variable-frequency continuous water replenishing of the boiler drum liquid level, the liquid level of the deaerator also achieves variable-frequency continuous water replenishing, and at the moment, a water feeding pump, an economizer and the boiler drum liquid level form a closed-loop control system; the liquid levels of the oxygen removal pump, the condenser and the oxygen remover are another closed-loop control system. Wherein the liquid level of the deaerator has the key function of starting and stopping in the whole system. When the steam drum liquid level descends, the water feed pump begins to operate, so that the liquid level of the deaerator descends, and then the deaerator pump begins to operate, so far, the dynamic liquid level control system is added with the condenser and the energy saver respectively in two closed-loop controls, under the adding of continuous water replenishing, the effective absorption smoke heat reduces the smoke exhaust temperature, as shown in figure 3, compared with the prior art firstly, and the circulating pump is cancelled, and the temperature of the soft water tank can not rise, so that the overheating condition of the temperature of the soft water tank is avoided.
According to the technical scheme, the invention has the following beneficial effects:
the invention relates to a condensing boiler drum liquid level control system with an energy-saving technology, which provides solutions aiming at furnaces with deaerators and furnaces without deaerators to achieve an energy-saving effect; the energy-saving influence of the load change of a user on the drum liquid level control system is overcome; the heat loss of the exhaust gas temperature is effectively reduced; the problem of overheating of the soft water tank is effectively solved; the original unchanged pipeline connection mode is replaced by the mode that the electromagnetic valve switches the pipeline for controlling the furnace without the deaerator; aiming at the furnace type with the deoxygenator, a double-continuous frequency conversion water replenishing strategy is adopted, so that the problems of overheating temperature of the soft water tank, overhigh smoke exhaust temperature and the like are solved while the water supply continuity is ensured.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. The utility model provides a condensing boiler drum liquid level control system with energy-conserving technique, condensing boiler is including the condensing boiler that does not contain the oxygen-eliminating device and the condensing boiler that contains the oxygen-eliminating device, a serial communication port, boiler drum liquid level control system is including the condensing boiler drum liquid level control system that does not contain the oxygen-eliminating device and the condensing boiler drum liquid level control system that contains the oxygen-eliminating device, the condensing boiler that does not contain the oxygen-eliminating device is controlled by the condensing boiler drum liquid level control system that does not contain the oxygen-eliminating device, the condensing boiler that contains the oxygen-eliminating device is controlled by the condensing boiler drum liquid level control system that contains the oxygen-eliminating device.
2. The condensing boiler drum liquid level control system with energy saving technology as claimed in claim 1, it is characterized in that the condensing boiler without the deaerator comprises a soft water tank, a feed pump, a circulating pump, a condenser, an energy saver and a boiler steam drum, the condensate boiler drum liquid level control system without the deaerator comprises a solenoid valve V1, a solenoid valve V2, a solenoid valve V3, a solenoid valve V4 and a solenoid valve V5, the electromagnetic valve V1 is connected between the inlet of the condenser and the circulating pump, the electromagnetic valve V2 is connected between the outlet of the condenser and the soft water tank, the solenoid valve V3 is connected between the inlet of the condenser and the feed water pump, the solenoid valve V4 is connected between the outlet of the condenser and the inlet of the economizer, the solenoid valve V5 is connected between the economizer inlet and the feed water pump, and the solenoid valves V1, V2 and V5 are interlocked with the circulation pump and with the solenoid valves V3 and V4.
3. The condensing boiler drum liquid level control system with energy saving technology as claimed in claim 1, wherein the control mode of the boiler drum liquid level control system includes relay circuit, single chip microcomputer or decentralized control system.
4. The condensing boiler drum liquid level control system with energy saving technology as claimed in claim 1, wherein the condensing boiler with deaerator comprises a soft water tank, a feed water pump, a deaerating water pump, a condenser, an economizer, a deaerator and a boiler drum.
5. The condensing boiler drum liquid level control system with energy saving technology as claimed in claim 4, wherein the condensing boiler drum liquid level control system containing a deaerator comprises a deaerator liquid level feedback control system and a drum liquid level feedback control system.
6. The condensing boiler drum liquid level control system with energy saving technology as claimed in claim 5, wherein the deaerator liquid level feedback control system is used for controlling the variable frequency operation of a deaerating water pump, and the drum liquid level feedback control system is used for controlling the variable frequency operation of a feed water pump.
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| CN201911231990.9A CN110906312B (en) | 2019-12-05 | 2019-12-05 | Condensing boiler drum liquid level control system with energy-saving technology |
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| CN201911231990.9A CN110906312B (en) | 2019-12-05 | 2019-12-05 | Condensing boiler drum liquid level control system with energy-saving technology |
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| CN110906312A true CN110906312A (en) | 2020-03-24 |
| CN110906312B CN110906312B (en) | 2021-04-23 |
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| CN102330966A (en) * | 2011-08-17 | 2012-01-25 | 安阳方快锅炉有限公司 | Energy-saving heat-supplying device of condensation steam boiler |
| CN102635847A (en) * | 2012-04-26 | 2012-08-15 | 浙江中烟工业有限责任公司 | Water feeding system for multiple condensing boilers |
| JP5117197B2 (en) * | 2008-01-09 | 2013-01-09 | 株式会社東芝 | Waste heat recovery boiler unit |
| CN103438427A (en) * | 2013-08-09 | 2013-12-11 | 天津诺能达能源科技有限公司 | Gas-fired boiler afterheat recovering system and recovering method |
| CN204042853U (en) * | 2014-08-15 | 2014-12-24 | 天津诺能达能源科技有限公司 | Steam boiler waste heat reclaims and system for deoxidizing by heat power |
| CN110186029A (en) * | 2019-04-18 | 2019-08-30 | 福建省新元能源发展有限公司 | A kind of energy-saving and environment-friendly gas fired-boiler |
-
2019
- 2019-12-05 CN CN201911231990.9A patent/CN110906312B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5117197B2 (en) * | 2008-01-09 | 2013-01-09 | 株式会社東芝 | Waste heat recovery boiler unit |
| CN102330966A (en) * | 2011-08-17 | 2012-01-25 | 安阳方快锅炉有限公司 | Energy-saving heat-supplying device of condensation steam boiler |
| CN102635847A (en) * | 2012-04-26 | 2012-08-15 | 浙江中烟工业有限责任公司 | Water feeding system for multiple condensing boilers |
| CN103438427A (en) * | 2013-08-09 | 2013-12-11 | 天津诺能达能源科技有限公司 | Gas-fired boiler afterheat recovering system and recovering method |
| CN204042853U (en) * | 2014-08-15 | 2014-12-24 | 天津诺能达能源科技有限公司 | Steam boiler waste heat reclaims and system for deoxidizing by heat power |
| CN110186029A (en) * | 2019-04-18 | 2019-08-30 | 福建省新元能源发展有限公司 | A kind of energy-saving and environment-friendly gas fired-boiler |
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| CN110906312B (en) | 2021-04-23 |
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