CN114264073A - Preheating system with multiple parallel boilers and control method thereof - Google Patents
Preheating system with multiple parallel boilers and control method thereof Download PDFInfo
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- CN114264073A CN114264073A CN202111633939.8A CN202111633939A CN114264073A CN 114264073 A CN114264073 A CN 114264073A CN 202111633939 A CN202111633939 A CN 202111633939A CN 114264073 A CN114264073 A CN 114264073A
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- preheater
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- 238000000034 method Methods 0.000 title claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 129
- 239000000779 smoke Substances 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 22
- 239000003546 flue gas Substances 0.000 claims description 22
- 230000001276 controlling effect Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000008236 heating water Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 235000019504 cigarettes Nutrition 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to the technical field of boiler heat supply, in particular to a preheating system with multiple parallel boilers, which comprises multiple boilers, wherein a smoke outlet of each boiler is connected with a preheater, a water inlet of each preheater is communicated with a water inlet main pipe through a preheater water inlet regulating valve, a smoke outlet of each preheater is provided with a temperature sensor, and the preheater water inlet regulating valve and the temperature sensor are connected with a control device. According to the technical scheme, the temperature sensor is adopted to monitor the smoke outlet temperature of the preheaters, and the control device controls the water inlet regulating valve of the preheaters according to the smoke outlet temperature of the preheaters, so that the water inlet amount of the preheaters is adjusted, the smoke outlet temperature of each preheater is automatically controlled, the smoke outlet temperature of each preheater is basically consistent, the heat exchange effect of each preheater is ensured, and the service life of each preheater is prolonged.
Description
Technical Field
The invention relates to the technical field of boiler heat supply, in particular to a preheating system with multiple parallel boilers and a control method thereof.
Background
The boiler is an energy conversion device, the energy input to the boiler comprises chemical energy and electric energy in fuel, the boiler outputs steam, high-temperature water or an organic heat carrier with certain heat energy, hot water or steam generated in the boiler can directly provide heat energy required by industrial production and people life, the hot water or steam can be converted into mechanical energy through a steam power device, or the mechanical energy is converted into electric energy through a generator, the boiler mainly comprises a hot water boiler and a steam boiler, the hot water boiler is used for providing hot water and is mainly used for life, and the steam boiler is used for providing steam and is mainly used for thermal power stations, ships, locomotives and industrial and mining enterprises.
The temperature of smoke is one of the important technical and economic indicators in the boiler operation, the temperature change of smoke has great influence to boiler operation economy, however, many boilers are usually equipped with in the current boiler room, many boilers move simultaneously, the load of every boiler is different, cause preheater smoke temperature to have the difference, when boiler load is higher, preheater smoke temperature is high, reduce boiler efficiency easily, increase consumption, when boiler load is lower, preheater smoke temperature is lower, the long-time operation in-process of preheater, flue gas condensate water in the preheater can cause serious corrosion to the preheater, shorten the life of preheater.
Disclosure of Invention
The invention aims to provide a preheating system with a plurality of parallel boilers, which solves the problem of difference of smoke outlet temperatures of preheaters, can realize automatic control of the smoke outlet temperatures of the preheaters, ensures the smoke outlet temperatures of the preheaters to be basically consistent, ensures the heat exchange effect of the preheaters and prolongs the service life of the preheaters; the second purpose of the invention is to provide a control method of a preheating system with a plurality of parallel boilers.
The invention provides a preheating system with a plurality of boilers connected in parallel, which comprises a plurality of boilers, wherein a smoke outlet of each boiler is connected with a preheater, a water inlet of each preheater is communicated with a water inlet main pipe through a preheater water inlet regulating valve, a smoke outlet of each preheater is provided with a temperature sensor, and the preheater water inlet regulating valve and the temperature sensor are connected with a control device.
Further, the control device is a PLC controller.
Further, each water inlet of the boiler is communicated with the water inlet main pipe through a boiler water inlet pipe.
Further, every the delivery port of preheater all communicates with the main pipe intercommunication of preheater play water, every the boiler inlet tube all through the bleeder with the main pipe intercommunication of preheater play water.
Furthermore, each branch pipe is provided with a boiler water inlet regulating valve, and the boiler water inlet regulating valves are connected with the PLC.
Furthermore, the water outlet of each boiler is connected in parallel with a boiler water outlet main pipe through a boiler water outlet pipe.
The invention provides a control method of a preheating system with a plurality of parallel boilers, which comprises the following steps:
s1, heating water through the boiler, wherein flue gas generated in the boiler heating process enters a preheater;
s2, introducing water into the preheater through the water inlet main pipe, cooling the flue gas in the preheater, and discharging the flue gas subjected to cooling treatment from a flue gas outlet of the preheater;
s3, monitoring the smoke outlet temperature of the preheater through the temperature sensor, and controlling the water inlet regulating valve of the preheater through the control device according to the smoke outlet temperature of the preheater so as to adjust the water inlet amount of the preheater.
Further, the smoke outlet temperature of the preheater is 5-10 ℃ higher than the water inlet temperature of the preheater.
Further, water in the boiler comes from the water inlet main pipe and the water outlet main pipe of the preheater respectively.
Further, the control device controls the boiler water inlet regulating valve so as to adjust the water outlet amount of the branch pipe.
The invention has the beneficial effects that:
according to the technical scheme, the water inlet main pipe is adopted to introduce water into the preheaters, the heat of the flue gas in the preheaters is absorbed through the water, the flue gas in the preheaters is cooled, the temperature sensor is adopted to monitor the smoke outlet temperature of the preheaters, the control device controls the water inlet adjusting valve of the preheaters according to the smoke outlet temperature of the preheaters, so that the water inlet amount of the preheaters is adjusted, the smoke outlet temperature of each preheater is automatically controlled, the smoke outlet temperature of each preheater is basically consistent, the heat exchange effect of each preheater is ensured, and the service life of each preheater is prolonged.
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 some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
Description of reference numerals:
1-boiler, 2-preheater, 3-preheater water inlet regulating valve, 4-temperature sensor, 5-water inlet main pipe, 6-preheater water outlet main pipe, 7-branch pipe, 8-boiler water inlet regulating valve, 9-boiler water inlet pipe, 10-boiler water outlet pipe and 11-boiler water outlet main pipe.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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 description of the present invention, it is to be understood that the terms "inside", "outside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
A preheating system with multiple parallel boilers and a control method are shown in figure 1 and comprise multiple boilers 1, in the embodiment, the number of the boilers 1 is 3, a water inlet of each boiler 1 is connected with a water inlet main pipe 5 in parallel through a boiler water inlet pipe 9, and a water outlet of each boiler 1 is connected with a boiler water outlet main pipe 11 in parallel through a boiler water outlet pipe 10. The water inlet main pipe 5 is communicated with water in the boiler 1 through a boiler water inlet pipe 9, the water is heated through the boiler 1, the heated water in each boiler 1 is collected to the boiler water outlet main pipe 11 through a boiler water outlet pipe 10, and the water is discharged through the boiler water outlet main pipe 11.
A pre-heater 2 is all connected to the outlet flue of every boiler 1, and the water inlet of every pre-heater 2 is parallelly connected with female pipe 5 of intaking through pre-heater governing valve 3 that intakes, and the outlet flue of every pre-heater 2 all is equipped with temperature sensor 4, and pre-heater governing valve 3 that intakes and temperature sensor 4 all are connected with controlling means, and controlling means is the PLC controller. Flue gas that boiler 1 heating in-process produced gets into in the preheater 2, it leads to water in to preheater 2 through female pipe 5 of intaking, absorb the heat of flue gas in the preheater 2, the flue gas in the preheater 2 is cooled down and is handled, flue gas after cooling down is handled is discharged from the outlet flue of preheater 2, and through the play cigarette temperature of temperature sensor 4 monitoring preheater 2, and with signal transmission to PLC controller, PLC controller controls preheater inlet regulating valve 3 according to the play cigarette temperature of preheater 2, thereby adjust the inflow of preheater 2, realize the automatic control of preheater 2 play cigarette temperature, make the play cigarette temperature of each preheater 2 tend to unanimity, the play cigarette temperature of preheater 2 is higher 5-10 than the inlet water temperature of preheater 2, ensure the heat transfer effect of preheater 2, prolong the life of preheater 2.
The delivery port of every pre-heater 2 and the female pipe 6 of pre-heater play water are parallelly connected, and the boiler inlet tube 9 of every boiler 1 all goes out water female pipe 6 intercommunication through bleeder 7 and pre-heater, all is equipped with boiler inlet regulating valve 8 on the bleeder 7 of every boiler 1, and boiler inlet regulating valve 8 is connected with the PLC controller. The water in the preheater 2 absorbs the heat of the flue gas and then enters the preheater water outlet main pipe 6, the water in the preheater water outlet main pipe 6 enters the boiler water inlet pipe 9 through the branch pipe 7, thereby entering the boiler 1, the boiler 1 operates quantitatively, the water inlet amount of each boiler 1 needs to be ensured to be consistent, the water in the water inlet main pipe 5 is divided into two parts, one part directly enters the boiler 1, the other part absorbs the heat of the flue gas in the preheater 2 for preheating and then enters the boiler 1, the part of the water amount of the water inlet main pipe 5 directly entering the boiler 1 is constant, the water inlet amount of the boiler 1 needs to be controlled by adjusting the part of the water amount preheated by the preheater 2, if the water outlet of the preheater 2 is directly communicated with the boiler water inlet pipe 9, the water inlet amount and the water outlet amount of the preheater 2 are constant, and the adjustment along with the flue gas outlet temperature of the preheater 2 cannot be carried out, consequently, all communicate with the female pipe 6 of pre-heater play water with every delivery port of preheating 2, make in the pre-heater 2 through the water of preheating collect in the female pipe 6 of pre-heater play water, in getting into boiler inlet tube 9 through bleeder 7, and be equipped with boiler governing valve 8 that intakes on bleeder 7 to through PLC controller control boiler governing valve 8 that intakes, thereby the water yield of adjustment bleeder 7, and then the inflow of adjustment boiler 1.
The control method of the preheating system comprises the following steps:
s1, introducing water into each boiler 1 through a boiler water inlet pipe 9 by a water inlet main pipe 5, heating the water through the boilers 1, and collecting the water heated by each boiler 1 into a boiler water outlet main pipe 11 through a boiler water outlet pipe 10 to be discharged;
s2, enabling flue gas generated in the heating process of the boiler 1 to enter a preheater 2, introducing water into the preheater 2 through a water inlet main pipe 5, cooling the flue gas in the preheater 2, and discharging the flue gas subjected to cooling treatment from a smoke outlet of the preheater 2;
s3, monitoring the smoke outlet temperature of the preheater 2 through the temperature sensor 4, transmitting a signal to the control device, and controlling the preheater water inlet regulating valve 3 through the control device according to the smoke outlet temperature of the preheater 2 so as to adjust the water inlet quantity of the preheater 2 and ensure that the smoke outlet temperature of the preheater 2 is 5-10 degrees higher than the water inlet temperature of the preheater 2;
s4, water in the preheater 2 absorbs heat of flue gas and then enters the preheater water outlet main pipe 6, water in the preheater water outlet main pipe 6 enters the boiler water inlet pipe 9 through the branch pipe 7 so as to enter the boiler 1, and the control device controls water outlet quantity of the branch pipe 7 through controlling the boiler water inlet regulating valve 8 so as to control water inlet quantity of the boiler 1.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a parallelly connected preheating system of many boilers, its characterized in that, includes many boilers, every the outlet flue of boiler all is connected with a pre-heater, every the water inlet of pre-heater all feeds through with the female pipe intercommunication of intaking through the pre-heater governing valve that intakes, every the outlet flue of pre-heater all is equipped with temperature sensor, the pre-heater governing valve that intakes with temperature sensor all is connected with controlling means.
2. The parallel multi-boiler preheating system according to claim 1, wherein the control device is a PLC controller.
3. The system of claim 2, wherein the inlet of each boiler is connected to the inlet header via a boiler inlet tube.
4. The system of claim 3, wherein the water outlet of each preheater is in communication with a preheater water outlet header, and the water inlet of each boiler is in communication with the preheater water outlet header via a branch pipe.
5. The system of claim 4, wherein each branch pipe is provided with a boiler feed water regulating valve, and the boiler feed water regulating valve is connected with the PLC.
6. The parallel preheating system of claim 1, wherein the water outlet of each boiler is connected in parallel with the boiler water outlet header pipe through a boiler water outlet pipe.
7. A method for controlling a preheating system in which a plurality of boilers are connected in parallel according to any one of claims 1 to 6, comprising the steps of:
s1, heating water through the boiler, wherein flue gas generated in the boiler heating process enters a preheater;
s2, introducing water into the preheater through the water inlet main pipe, cooling the flue gas in the preheater, and discharging the flue gas subjected to cooling treatment from a flue gas outlet of the preheater;
s3, monitoring the smoke outlet temperature of the preheater through the temperature sensor, and controlling the water inlet regulating valve of the preheater through the control device according to the smoke outlet temperature of the preheater so as to adjust the water inlet amount of the preheater.
8. The method for controlling the preheating system with a plurality of parallel boilers in claim 7, wherein the smoke outlet temperature of the preheater is 5-10 ℃ higher than the inlet water temperature of the preheater.
9. The method for controlling the preheating system connected with a plurality of boilers in parallel according to claim 7, wherein water in the boilers is from the water inlet header pipe and the water outlet header pipe of the preheater respectively.
10. The method of claim 9, wherein the control device controls the boiler feed water control valve to adjust the water output of the branch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111633939.8A CN114264073A (en) | 2021-12-29 | 2021-12-29 | Preheating system with multiple parallel boilers and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111633939.8A CN114264073A (en) | 2021-12-29 | 2021-12-29 | Preheating system with multiple parallel boilers and control method thereof |
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| CN114264073A true CN114264073A (en) | 2022-04-01 |
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| CN202111633939.8A Pending CN114264073A (en) | 2021-12-29 | 2021-12-29 | Preheating system with multiple parallel boilers and control method thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011214829A (en) * | 2011-07-22 | 2011-10-27 | Kawasaki Heavy Ind Ltd | Temperature fluctuation suppressing device for heating medium, heating medium supply facility, and solar heat generation facility |
| CN206739627U (en) * | 2017-04-18 | 2017-12-12 | 浙江中烟工业有限责任公司 | More condenser boiler water supply systems |
| CN107543140A (en) * | 2016-06-27 | 2018-01-05 | 黑龙江省康格尔科技有限公司 | A kind of more condenser boiler water supply systems |
| CN207350812U (en) * | 2017-08-30 | 2018-05-11 | 上杭县杭丰蔬菜农民专业合作社 | A kind of steam water boiler |
| CN108361988A (en) * | 2018-03-27 | 2018-08-03 | 中国科学院广州能源研究所 | A kind of high efficiency boiler energy-saving control system and control method |
| CN209295090U (en) * | 2018-10-12 | 2019-08-23 | 山东恒涛节能环保有限公司 | A kind of multifunctional low-temperature economizer system |
| CN111981465A (en) * | 2020-09-14 | 2020-11-24 | 烟台龙源电力技术股份有限公司 | Flue gas waste heat utilization system |
| CN214619653U (en) * | 2021-03-30 | 2021-11-05 | 青岛新奥清洁能源有限公司 | Flue gas waste heat recovery system of gas-fired hot water boiler sharing economizer |
-
2021
- 2021-12-29 CN CN202111633939.8A patent/CN114264073A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011214829A (en) * | 2011-07-22 | 2011-10-27 | Kawasaki Heavy Ind Ltd | Temperature fluctuation suppressing device for heating medium, heating medium supply facility, and solar heat generation facility |
| CN107543140A (en) * | 2016-06-27 | 2018-01-05 | 黑龙江省康格尔科技有限公司 | A kind of more condenser boiler water supply systems |
| CN206739627U (en) * | 2017-04-18 | 2017-12-12 | 浙江中烟工业有限责任公司 | More condenser boiler water supply systems |
| CN207350812U (en) * | 2017-08-30 | 2018-05-11 | 上杭县杭丰蔬菜农民专业合作社 | A kind of steam water boiler |
| CN108361988A (en) * | 2018-03-27 | 2018-08-03 | 中国科学院广州能源研究所 | A kind of high efficiency boiler energy-saving control system and control method |
| CN209295090U (en) * | 2018-10-12 | 2019-08-23 | 山东恒涛节能环保有限公司 | A kind of multifunctional low-temperature economizer system |
| CN111981465A (en) * | 2020-09-14 | 2020-11-24 | 烟台龙源电力技术股份有限公司 | Flue gas waste heat utilization system |
| CN214619653U (en) * | 2021-03-30 | 2021-11-05 | 青岛新奥清洁能源有限公司 | Flue gas waste heat recovery system of gas-fired hot water boiler sharing economizer |
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