CN115451392A - Steam generator using electrode boiler and control method thereof - Google Patents
Steam generator using electrode boiler and control method thereof Download PDFInfo
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- CN115451392A CN115451392A CN202211165166.XA CN202211165166A CN115451392A CN 115451392 A CN115451392 A CN 115451392A CN 202211165166 A CN202211165166 A CN 202211165166A CN 115451392 A CN115451392 A CN 115451392A
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- 238000010438 heat treatment Methods 0.000 claims abstract description 64
- 230000007246 mechanism Effects 0.000 claims abstract description 64
- 229920006395 saturated elastomer Polymers 0.000 claims description 41
- 239000010865 sewage Substances 0.000 claims description 4
- 210000004907 gland Anatomy 0.000 claims 2
- 238000005485 electric heating Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 12
- 230000001965 increasing effect Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
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- 238000011033 desalting Methods 0.000 description 3
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
- F22B1/30—Electrode boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/22—Drums; Headers; Accessories therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
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Abstract
The invention relates to the technical field of electrode boilers, and provides a steam generator applying an electrode boiler and a control method thereof, wherein the steam generator applying the electrode boiler comprises: an inner cylinder filled with pot water; the heating electrode is inserted into the inner cylinder and used for heating the boiler water in the inner cylinder; an evaporator for generating steam; the boiler water pipe bundle mechanism is arranged in the evaporator and is used for heating steam generated by the evaporator; and the circulating pipeline is used for communicating the inner cylinder with the boiler water tube bundle mechanism so as to enable boiler water to circularly flow between the inner cylinder and the boiler water tube bundle mechanism. The problems of high cost and small scale of the electrode type steam generator using the electrode boiler to produce superheated steam in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of electrode boilers, in particular to a steam generator applying an electrode boiler and a control method thereof.
Background
With the technical development and large-scale industrialization of renewable energy sources such as wind power, photovoltaic and the like, the social electrification degree is further increased. Steam has an indispensable position in production activities in a plurality of industrial fields such as food, medicine, grain and oil, chemical industry and the like. The clean zero-carbon renewable energy is used for generating electricity to produce steam to replace a coal/oil/gas boiler to produce steam, and green production of industrial steam can be realized. This has led to the widespread use of electrode boilers and associated electrode steam generators as a whole new way of electrically heated steam generation.
However, the existing electrode type steam generator can only directly generate saturated steam and can not directly generate superheated steam; if the superheated steam needs to be generated, the superheated steam needs to be matched with other matching devices such as an electric heating tube and the like, so that the construction cost and the production cost are greatly increased, the yield of the superheated steam is small, and the electrode type steam generator of the applied electrode boiler is high in superheated steam production cost and small in scale.
Disclosure of Invention
The invention aims to solve the problems of high cost and small scale of the electrode type steam generator for producing superheated steam in the prior art.
In order to solve the above problems, the present invention provides a steam generator using an electrode boiler, comprising:
an inner cylinder filled with boiler water;
the heating electrode is inserted into the inner barrel and used for heating the boiler water in the inner barrel;
an evaporator for generating steam;
the boiler water tube bundle mechanism is arranged in the evaporator and is used for heating the feed water and the generated steam in the evaporator; and
and the circulating pipeline is used for communicating the inner cylinder with the boiler water tube bundle mechanism so as to enable boiler water to circularly flow between the inner cylinder and the boiler water tube bundle mechanism.
Optionally, the steam generator of the utility electrode boiler further comprises a pressurizer installed in the circulation line.
Optionally, the voltage regulator includes:
the shell is arranged above the circulating pipeline, and the bottom of the shell is communicated with the high-temperature pipe of the circulating pipeline;
the heater is arranged at the bottom in the shell; and
and the sprayer is fixed at the top in the shell.
Optionally, the circulation pipeline includes a high temperature pipe, a low temperature pipe and a circulation pump, the high temperature pipe communicates the top of the inner cylinder with the top of the boiler water pipe bundle mechanism, the low temperature pipe communicates the bottom of the inner cylinder with the bottom of the boiler water pipe bundle mechanism, and the circulation pump is installed at the low temperature pipe.
Optionally, the boiler water tube bundle mechanism includes high-temperature circulation boiler water header, low-temperature circulation boiler water header and a plurality of boiler water tube bundles, high-temperature circulation boiler water header with the high-temperature pipe intercommunication, low-temperature circulation boiler water header with the low-temperature pipe intercommunication, high-temperature circulation boiler water header a plurality of boiler water tube bundles the low-temperature circulation boiler water header is from last to communicating in proper order down.
Optionally, the evaporator is a straight-flow evaporator, a plurality of baffle plates are arranged in the evaporator, the baffle plates are arranged between the high-temperature circulation boiler water header and the low-temperature circulation boiler water header, the baffle plates are sequentially arranged in parallel at intervals from top to bottom, the baffle plates extend along the horizontal direction, and the boiler water tube bundle penetrates through the baffle plates.
Optionally, the steam generator of the application electrode boiler further comprises an outer cylinder, the inner cylinder is arranged at the top in the outer cylinder, the outer cylinder is used for storing standby boiler water, a boiler water inlet is formed in the bottom of the inner cylinder and used for conveying the standby boiler water to the inner cylinder, a sewage discharge outlet is formed in the bottom of the inner cylinder and used for being communicated with the outside of the outer cylinder.
Optionally, the heating electrode is a three-phase electrode, one end of the heating electrode is inserted from the top of the inner cylinder, the other end of the heating electrode extends out of the outer cylinder, an insulating sealing sleeve is sleeved on the outer surface of the heating electrode, and the insulating sealing sleeve extends from the top of the inner cylinder to the other end of the heating electrode outside the outer cylinder.
Optionally, a feed water inlet is arranged at the bottom end of the evaporator, the feed water inlet is connected with a first water pump, and the first water pump is used for controlling the feed water amount of the feed water inlet.
In addition, the present invention also provides a control method of a steam generator for controlling the steam generator of a boiler using electrodes, comprising:
when the superheated steam is produced, feeding feed water into the evaporator and only submerging a part of the boiler-water tube bundle mechanism to enable the evaporator to produce steam, and heating the steam produced by the evaporator by using the boiler-water tube bundle mechanism;
when saturated steam is produced, feed water is injected into the evaporator and flows over the top of the boiler water tube bundle mechanism, so that the evaporator generates steam, and the boiler water tube bundle mechanism is used for heating the steam generated by the evaporator.
Compared with the prior art, the steam generator of the boiler using the electrodes and the control method thereof provided by the invention have the following technical effects:
the boiler water is circulated between the inner cylinder and the boiler water tube bundle mechanism, a heating electrode is inserted into the inner cylinder to heat the boiler water in the inner cylinder, the boiler water tube bundle mechanism is arranged in the evaporator, the boiler water heated by the heating electrode is circulated into the boiler water tube bundle mechanism through the circulation pipeline, then the boiler water tube bundle mechanism is used for heating the water in the evaporator to generate saturated steam, the water is immersed in the boiler water tube bundle mechanism, and the steam generator outputs the saturated steam; the boiler water tube bundle mechanism is not completely immersed by the feed water, and saturated steam is further heated into corresponding superheated steam by the boiler water tube bundle mechanism which is not immersed by the feed water; in the process, the characteristic that the evaporator continuously generates saturated steam is utilized, and a circulating heating system formed by the inner cylinder, the boiler water tube bundle mechanism and the circulating pipeline is matched to continuously heat the feed water and the saturated steam, so that the superheated steam is continuously generated, and the superheated steam is supplied in a large scale.
In addition, a large number of electric heating tubes are used for heating saturated steam in the prior art, a single electric heating tube has high manufacturing cost, and a large number of electric heating tubes have high manufacturing cost. Thereby solving the problems of high cost and small scale of the superheated steam produced by the steam generator of the electrode boiler in the prior art.
In addition, a closed circulating system is formed by the inner cylinder, the boiler water tube bundle mechanism and the circulating pipeline, so that high-quality boiler water subjected to softening, desalting, deoxidizing and conductive ion tempering is used as a heat transfer medium and is subjected to reciprocating heat exchange circulation in the closed circulating loop without being directly converted into steam for output. The continuous input of high-quality boiler water into the inner barrel is avoided, the boiler water can not be recycled, the sewage discharge amount of the inner barrel is reduced, and the operation cost of the electrode type steam generator is further reduced.
Drawings
Fig. 1 is a schematic configuration view of a steam generator of the electrode-applied boiler according to the present invention.
Description of reference numerals:
1. an outer cylinder; 2. a boiler water inlet; 3. an inner barrel; 4 heating the electrode; 5. an insulating sealing sleeve; 6. a heater; 7. a housing; 8. a sprayer; 9. a steam outlet; 10. a steam-water separator; 11. a baffle plate; 12. a high-temperature circulating boiler water header; 13. a boiler water pipe bundle; 14. a feed water inlet; 15. a low-temperature circulating boiler water header; 16. a circulation pump; 17. a blowdown outlet; 18. a low-temperature backwater inlet; 19. a high-temperature circulating boiler water outlet; 20. a high temperature tube; 21. a cryostraw; 22. an evaporator.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; 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.
In the description herein, references to "an embodiment," "one embodiment," and "one implementation," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or implementation is included in at least one embodiment or implementation of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.
In order to solve the above technical problems, as shown in fig. 1, the present invention provides a steam generator using an electrode boiler, comprising:
an inner cylinder 3 filled with boiler water;
a heating electrode 4 inserted into the inner barrel 3, wherein the heating electrode 4 is used for heating the boiler water in the inner barrel 3;
an evaporator 22 for generating steam;
a boiler water tube bundle mechanism disposed in the evaporator 22, the boiler water tube bundle mechanism being used for heating the steam generated by the evaporator 22; and
and the circulating pipeline is used for communicating the inner cylinder 3 with the boiler water tube bundle mechanism so as to enable boiler water to circularly flow between the inner cylinder 3 and the boiler water tube bundle mechanism.
The inventor of the invention discovers through analysis that the pure electrode type steam generator in the prior art can only directly generate saturated steam and can not directly generate superheated steam mainly because the existing pure electrode type steam generator is a mode of immersing electrodes into water, electrifying and heating to gasify water, water needs to be conducted between the electrodes, and steam in a steam-water coexistence space can only be saturated steam, so that the existing electrode type steam generator can only generate saturated steam and can not generate superheated steam.
In addition, the inventor of the present invention further studies on the basis of the above, and on one hand, the existing production process of the electrode type superheated steam generator is to firstly generate saturated steam in an electrode heating manner, and then further heat the saturated steam by an electric heat pipe to convert the saturated steam into superheated steam. The process has the disadvantages that firstly, the electric heating tubes have higher manufacturing cost, and a plurality of electric heating tubes are required to be arranged in the overheating device to form a tube bundle for effectively heating saturated steam, so that the heat exchange area is increased, and the equipment cost of the electrode type steam generator for realizing steam overheating through the electric heating tubes is further increased; on the other hand, the electrode steam generator has higher quality requirements for boiler water than the evaporator 22. In order to prevent the electrode and the cylinder from being corroded in high-temperature and high-pressure water, scale is formed on the surface of the electrode along with evaporated salts of the water, and the electrode and the water are electrolyzed and converted into hydrogen, oxygen and the like which damage the safe operation of equipment, the boiler water of an electrode boiler needs to be subjected to a series of treatments such as softening, desalting, deoxidizing and the like; in order to ensure the power of the electrode type steam generator, sufficient current needs to be passed through the water between the electrodes. Therefore, ions which are weak in corrosiveness, low in scaling rate and have no catalytic effect on hydrogen evolution are selectively added into the boiler water. As the boiler water is converted into steam to be supplied to the user, high-quality boiler water is continuously supplied to the electrode type steam generator and accumulated harmful substances are discharged, thereby increasing the operation cost.
Finally, the volume and power of the electric heating tube are limited, and the requirement of large-scale production of superheated steam cannot be met, so that the yield of the superheated steam is low and the production scale is small. Moreover, the electric heating tube which is corroded in the high-temperature and high-pressure steam environment for a long time can be locally overheated, thereby causing potential safety hazards.
Therefore, the problems of high cost and small scale of the prior art for producing superheated steam by using the electrode type steam generator of the electrode boiler are caused only by the reasons.
Aiming at the above analysis, the invention discloses a closed circulating system which is formed by an inner cylinder 3, a boiler water tube bundle mechanism and a circulating pipeline, so that boiler water circularly flows between the inner cylinder 3 and the boiler water tube bundle mechanism, a heating electrode 4 is inserted into the inner cylinder 3 to heat the boiler water in the inner cylinder 3, the boiler water tube bundle mechanism is arranged in an evaporator 22, the boiler water heated by the heating electrode 4 is circulated into the boiler water tube bundle mechanism through the circulating pipeline, then the boiler water tube bundle mechanism is used to heat saturated steam generated by feed water in the evaporator 22, namely the saturated steam generated by the evaporator, the boiler water tube bundle mechanism is immersed by the feed water, and the steam generator outputs the saturated steam; so that the boiler water tube bundle mechanism is not completely immersed by the feed water, and the saturated steam is further heated into corresponding superheated steam by the boiler water tube bundle mechanism which is not immersed by the feed water; in the process, the characteristic that the evaporator 22 continuously generates saturated steam is utilized, and a circulating heating system consisting of the inner cylinder 3, the boiler water tube bundle mechanism and the circulating pipeline is matched to continuously heat the feed water and the saturated steam, so that the superheated steam is continuously generated, and the superheated steam is supplied in a large scale.
In addition, a large number of electric heating tubes are used for heating saturated steam in the prior art, a single electric heating tube has high manufacturing cost, and a large number of electric heating tubes have high manufacturing cost. Thereby solving the problems of high cost and small scale of the electrode type steam generator of the electrode boiler for producing the superheated steam in the prior art.
In addition, a closed circulating system is formed by the inner cylinder 3, the boiler water tube bundle mechanism and the circulating pipeline, so that high-quality boiler water subjected to softening, desalting, deoxidizing and conductive ion conditioning is used as a heat transfer medium and is subjected to reciprocating heat exchange circulation in the closed circulating loop without being directly converted into steam for output. The continuous input of high-quality boiler water to the inner barrel 3 is avoided, the boiler water can not be recycled, the discharge capacity of the inner barrel 3 is reduced, and the operation cost of the electrode type steam generator is greatly reduced.
Referring to fig. 1, further, the steam generator of the utility electrode boiler further includes a pressurizer installed in the circulation line.
Referring to fig. 1, further, the voltage regulator includes:
the shell 7 is arranged above the circulating pipeline, and the bottom of the shell 7 is communicated with the circulating pipeline;
the heater 6 is arranged at the bottom in the shell 7, and the heater 6 is immersed by pot water; and
and the sprayer 8 is fixed at the top in the shell 7.
The voltage stabilizer is used for ensuring the pressure inside the circulation loop to be stable. The upper part in the shell 7 is a steam space, and the sprayer 8 is fixed at the top in the shell 7; the bottom in the shell 7 is a high-temperature circulating boiler water space, and the heater 6 is arranged at the bottom in the shell 7. When the pressure needs to be increased, the heater 6 is heated, so that the water in the high-temperature circulating pot is heated and evaporated to enter the water vapor space, and the pressure of the whole circulating loop is increased; when the pressure needs to be reduced, the sprayer 8 works, and cooling water is sprayed to condense water vapor, so that the pressure of the whole circulation loop is reduced.
Referring to fig. 1, further, the circulation line includes a high temperature pipe 20, a low temperature pipe 21 and a circulation pump 16, the high temperature pipe 20 communicates the top of the inner drum 3 with the top of the boiler water tube bundle mechanism, the low temperature pipe 21 communicates the bottom of the inner drum 3 with the bottom of the boiler water tube bundle mechanism, and the circulation pump 16 is installed at the low temperature pipe 21.
According to the characteristic of upward movement of steam, the top of the inner barrel 3 is communicated with the top of the boiler water tube bundle mechanism by the high-temperature tubes 20, the bottom of the inner barrel 3 is communicated with the bottom of the boiler water tube bundle mechanism by the low-temperature tubes 21, so that high-temperature boiler water flows downwards from the top of the boiler water tube bundle mechanism, saturated steam continuously exchanges heat with the boiler water tube bundle mechanism in the rising process, the saturated steam is converted into superheated steam and continuously heated, and temperature and pressure continuously exist between the superheated steam and the boiler water tube bundle mechanism so as to ensure the performance of the superheated steam.
Referring to fig. 1, the boiler-water tube bundle mechanism further includes a high-temperature circulating boiler-water header 12, a low-temperature circulating boiler-water header 15 and a plurality of boiler-water tube bundles 13, the high-temperature circulating boiler-water header 12 is communicated with the high-temperature tubes 20, the low-temperature circulating boiler-water header 15 is communicated with the low-temperature tubes 21, and the high-temperature circulating boiler-water header 12, the boiler-water tube bundles 13 and the low-temperature circulating boiler-water header 15 are sequentially communicated from top to bottom.
Here, the wall surface of the boiler water tube bundle 13 is a main heat exchange surface for circulating boiler water and feed water and steam generation in the evaporator 22. The boiler-water tube bundle 13 may be a vertically extending tube bundle, a horizontally arranged tube bundle, a U-shaped tube bundle, an inverted U-shaped tube bundle or an S-shaped tube bundle.
The boiler water tube bundles 13 are in full contact with steam generated by the evaporator 22 and exchange heat, so that the water supply in the evaporator 22 and the generated steam are fully heated. In addition, the high-temperature circulating boiler water header 12 and the low-temperature circulating boiler water header 15 can ensure that boiler water flows through each pipeline in the boiler water pipe bundles 13, so that the heat exchange effect of a plurality of boiler water pipe bundles 13 is ensured.
Referring to fig. 1, further, the evaporator 22 is a straight-flow evaporator, a plurality of baffle plates 11 are arranged in the evaporator 22, the baffle plates 11 are arranged between the high-temperature circulation boiler water header 12 and the low-temperature circulation boiler water header 15, the baffle plates 11 can be arranged in parallel at equal intervals from top to bottom in sequence, the baffle plates 11 extend along the horizontal direction, and the boiler water tube bundle 13 passes through the baffle plates 11. The baffles 11 may be offset.
The arrangement mode of the baffle plate 11 can be shown in fig. 1, and the baffle plate 11 is used for changing the steam flow direction, increasing the steam flow distance and the steam flow speed on the surface of the circulating boiler-water tube bundle 13, thereby enhancing the heat exchange effect of the boiler-water tube bundle 13 and the steam.
Referring to fig. 1, further, the steam generator of the boiler using the electrode further includes an outer cylinder 1, the inner cylinder 3 is disposed at the top of the inner cylinder 1, the outer cylinder 1 is used for storing standby boiler water, a boiler water inlet 2 is disposed at the bottom of the inner cylinder 3, the boiler water inlet 2 is used for conveying the standby boiler water to the inner cylinder 3, a blowdown outlet 17 is disposed at the bottom of the inner cylinder 3, and the blowdown outlet 17 is used for communicating with the outside of the outer cylinder 1.
By utilizing the characteristics that the outer barrel 1 can store the standby boiler water and the boiler water inlet 2 is used for conveying the standby boiler water to the inner barrel 3, the standby boiler water contained in the outer barrel 1 can be conveyed into the inner barrel 3 through the boiler water inlet 2 by using a second water pump. Thereby conveniently supplementing the boiler water to the inner cylinder 3, and particularly supplementing the boiler water under the condition of not interrupting the work of the boiler water pipe bundle mechanism. In addition, the outer cylinder 1 can play a role in preserving heat of the inner cylinder 3, and heat generated by the heating electrode 4 for heating the inner cylinder 3 is prevented from being dissipated rapidly, so that the operating power of the heating electrode 4 is reduced.
In addition, utilize blowdown export 17 be used for with the outside intercommunication of urceolus 1 can discharge the pot water that goes bad in the inner tube 3 for a long time of operation and the harmful substance that accumulates outside the urceolus 1 through blowdown export 17 to conveniently wash the maintenance to inner tube 3, pot water tube bank mechanism and circulating line.
Referring to fig. 1, further, the heating electrode 4 is a three-phase electrode, one end of the heating electrode 4 is inserted from the top of the inner cylinder 3, the other end of the heating electrode 4 extends out of the outer cylinder 1, an insulating sealing sleeve 5 is sleeved on the outer surface of the heating electrode 4, and the insulating sealing sleeve 5 extends from the top of the inner cylinder 3 to the other end of the heating electrode 4 outside the outer cylinder 1.
The insulating seal 5 is used to prevent the current of the heating electrode 4 from being conducted to the wall surface of the outer tube 1 and to prevent the steam from leaking.
Referring to fig. 1, further, the bottom end of the evaporator 22 is provided with a feed water inlet 14, and the feed water inlet 14 is connected with a first water pump for controlling the feed water amount of the feed water inlet 14. In addition, a high-temperature circulating boiler water outlet 19 is arranged at the top of the inner cylinder 3, the high-temperature circulating boiler water outlet 19 is connected with a circulating loop high-temperature pipe section 20, a low-temperature return water inlet 18 is arranged at the bottom of the inner cylinder 3, and the low-temperature return water inlet 18 is connected with a circulating loop low-temperature pipe section 21.
Referring to fig. 1, further, a steam outlet 9 may be provided at the top of the evaporator 22, and a plurality of steam separators 10 may be provided in the evaporator 22 below the steam outlet 9, and water droplets carried by the saturated steam are filtered by the steam separators 10.
In addition, the present invention also provides a control method of a steam generator for controlling the steam generator of the boiler using the electrodes, comprising:
when the system operates stably, the water supply quantity of the first water pump is equal to the steam quantity output by the steam generator 22, and the water supply pressure and the water level in the steam generator 22 determine the output steam pressure; the voltage at the heating electrode 4 determines the electrode power, i.e. the amount of heat the circulating boiler water brings to the feed water in the steam generator 22, and determines the output steam temperature and properties. Therefore, the voltage of the heating electrode 4 and the power of the first water pump are the final determinants of the steam property, temperature and pressure at the outlet of the steam generator 22.
In addition, the water level of the feed water in the steam generator 22 and the rotation speed of the circulating pump 16 can also affect the operation of the electrode type steam generator, and whether the feed water submerges the boiler water tube bundle mechanism determines that the output of the evaporator 22 is saturated steam or superheated steam, namely, the water level has direct influence on the property of the steam instantaneously output by the steam generator 22; the change of the rotating speed of the circulating pump 16 can change the instantaneous heat transfer between the boiler water tube bundle and the water supply/steam in the steam generator, and is also an important means for adjusting the operation condition and steam parameters of the electrode type steam generator.
The power of the first water pump is controlled to realize the adjustment of the water feeding quantity and the water feeding pressure of the water feeding inlet 14, and the adjustment of parameters such as outlet steam flow, pressure and the like at the top of the evaporator 22, thereby adjusting the output steam parameters of the steam generator of the boiler applying the electrodes.
In addition, the power of the first water pump can be rapidly adjusted to rapidly change the water level inside the evaporator 22, so that the output steam property can be changed, for example, the superheated steam generated by the evaporator 22 is changed into saturated steam, and the flow and the temperature of the output superheated steam can also be adjusted by changing the distribution of the water supply heating section and the steam heating section of the boiler water pipe bundle 13 through adjusting the water level in the evaporator 22.
The voltage of the heating electrode 4 is adjusted to change the heating power, so that the heat output by the circulation loop is adjusted, and the parameters such as the temperature and the superheat degree of the steam at the outlet of the direct current steam generator 22 are adjusted; after the rotating speed of the circulating pump 16 is adjusted to change the flow speed of the circulating boiler water, the convective heat transfer coefficients of the boiler water on the two sides of the boiler water tube bundle 13 and the feed water/steam in the steam generator 22 are changed, so that the heating power of the boiler water tube bundle 13 to the feed water/steam in the steam generator 22 can be quickly adjusted, and the steam temperature of the steam outlet 9 at the top of the steam generator can be quickly adjusted.
In the production of superheated steam, feed water is injected into the evaporator 22 and only a part of the boiler water tube bundle mechanism is submerged, so that the evaporator 22 produces steam (saturated steam), and the steam produced by the evaporator 22 is heated using the boiler water tube bundle mechanism, thereby obtaining superheated steam. And evaporating the feed water to generate saturated steam, and heating the saturated steam through the boiler water tube bundle mechanism which is not immersed by the feed water to form superheated steam. When the parameter of the superheated steam needs to be changed, the first water pump needs to be adjusted firstly, the water level in the evaporator 22 is adjusted to a specified position, then the first water pump inputs water supply according to the requirement, and the heating electrode 4 is switched to the required voltage; meanwhile, the circulating pump 16 adjusts the rotating speed according to the temperature of the boiler water, and controls the heat exchange coefficient between the boiler water at the two sides of the boiler water tube bundle and the water supply/steam, so that the boiler water tube bundle 13 generates superheated steam with the flow, the temperature and the pressure meeting the requirements after heating the water supply/steam in the steam generator 22.
When saturated steam is produced, feed water is injected into the evaporator 22 and flows over the top of the boiler-water tube bundle mechanism, so that the evaporator 22 generates steam, the boiler-water tube bundle mechanism is used for heating the steam generated by the evaporator 22, and the boiler-water tube bundle mechanism and the evaporator 22 are used for simultaneously injecting water into the evaporator 22 for heating, so that the efficiency of generating saturated steam is improved. The feed water is evaporated to generate saturated steam, and the saturated steam passes through the steam-water separator to remove water drops carried in the saturated steam. When the saturated steam parameters need to be changed, the heating electrode 4 needs to be switched to the required voltage, and the first water pump needs to be switched to the required power; meanwhile, the circulating pump 16 adjusts the rotating speed according to the temperature of the boiler water, controls the heat exchange coefficient between the boiler water at the two sides of the boiler water tube bundle and the water supply, and enables the boiler water tube bundle 13 to generate saturated steam with flow, temperature and pressure meeting the requirements after heating the water supply in the steam generator 22 which does not pass through the boiler tube bundle mechanism.
In addition, it should be noted that the superheated steam and the saturated steam are distinguished by: when water is heated to boiling under a certain pressure, the water begins to be gasified into steam, and the temperature of the steam is equal to the saturation temperature under the pressure, and the steam in the state is called saturated steam. If the saturated steam is further heated, its temperature will rise and exceed the saturation temperature at that pressure, and this steam exceeding the saturation temperature is called superheated steam.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A steam generator using an electrode boiler, comprising:
an inner cylinder (3) filled with boiler water;
the heating electrode (4) is inserted into the inner barrel (3), and the heating electrode (4) is used for heating the boiler water in the inner barrel (3);
an evaporator (22) for generating steam;
the boiler water pipe bundle mechanism is arranged in the evaporator (22) and is used for heating the feed water and the generated steam in the evaporator (22); and
and the circulating pipeline is used for communicating the inner cylinder (3) with the boiler water tube bundle mechanism so as to enable boiler water to circularly flow between the inner cylinder (3) and the boiler water tube bundle mechanism.
2. The steam generator of the utility electrode boiler of claim 1, further comprising a pressurizer installed in the circulation line.
3. The steam generator of the utility electrode boiler according to claim 2, wherein the pressurizer comprises:
the shell (7) is arranged above the circulating pipeline, and the bottom of the shell (7) is communicated with the circulating pipeline;
a heater (6) arranged at the bottom in the shell (7); and
and the heater (8) is fixed at the inner top of the shell (7).
4. The steam generator of the utility electrode boiler according to claim 1, wherein the circulation line comprises high temperature tubes (20), low temperature tubes (21), and a circulation pump (16), the high temperature tubes (20) communicating the top of the inner drum (3) with the top of the boiler water tube bundle mechanism, the low temperature tubes (21) communicating the bottom of the inner drum (3) with the bottom of the boiler water tube bundle mechanism, the circulation pump (16) being installed at the low temperature tubes (21).
5. The steam generator of the boiler using the electrodes as claimed in claim 4, wherein the boiler-water tube bundle mechanism comprises a high-temperature circulating boiler-water header (12), a low-temperature circulating boiler-water header (15) and a plurality of boiler-water tube bundles (13), the high-temperature circulating boiler-water header (12) is communicated with the high-temperature tubes (20), the low-temperature circulating boiler-water header (15) is communicated with the low-temperature tubes (21), and the high-temperature circulating boiler-water header (12), the plurality of boiler-water tube bundles (13) and the low-temperature circulating boiler-water header (15) are sequentially communicated from top to bottom.
6. The steam generator of the boiler using the electrodes as claimed in claim 5, wherein the evaporator (22) is a once-through evaporator, a plurality of baffle plates (11) are disposed in the evaporator (22), the baffle plates (11) are disposed between the high temperature circulation boiler water header (12) and the low temperature circulation boiler water header (15), the baffle plates (11) are sequentially disposed in parallel at intervals from top to bottom, the baffle plates (11) extend along a horizontal direction, and the boiler water tube bundle (13) passes through the baffle plates (11).
7. The steam generator of the utility electrode boiler according to any one of claims 1 to 6, further comprising an outer cylinder (1), wherein the inner cylinder (3) is disposed at the top of the inner cylinder (1), the outer cylinder (1) is used for storing the standby boiler water, the bottom of the inner cylinder (3) is provided with a boiler water inlet (2), the boiler water inlet (2) is used for conveying the standby boiler water to the inner cylinder (3), the bottom of the inner cylinder (3) is provided with a sewage outlet (17), and the sewage outlet (17) is used for communicating with the outside of the outer cylinder (1).
8. The steam generator of the utility electrode boiler according to claim 7, characterized in that the heating electrode (4) is a three-phase electrode, one end of the heating electrode (4) is inserted from the top of the inner tube (3), the other end of the heating electrode (4) extends out of the outer tube (1), an insulating gland (5) is sleeved on the outer surface of the heating electrode (4), and the insulating gland (5) extends from the top of the inner tube (3) to the other end of the heating electrode (4) outside the outer tube (1).
9. The steam generator of the utility electrode boiler according to any one of claims 1 to 6, wherein a bottom end of the evaporator (22) is provided with a feed water inlet (14), the feed water inlet (14) is connected with a first water pump for controlling a feed water amount of the feed water inlet (14).
10. A control method of a steam generator for controlling the steam generator of the boiler using electrodes of any one of claims 1 to 9, comprising:
when producing superheated steam, injecting feed water into the evaporator (22) and only submerging a part of the boiler water tube bundle mechanism, enabling the evaporator (22) to produce steam, and heating the steam produced by the evaporator (22) by using the boiler water tube bundle mechanism;
when saturated steam is produced, feed water is injected into the evaporator (22) and the top of the boiler water tube bundle mechanism is submerged, so that the evaporator (22) generates steam, and the boiler water tube bundle mechanism is used for heating the steam generated by the evaporator (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211165166.XA CN115451392A (en) | 2022-09-23 | 2022-09-23 | Steam generator using electrode boiler and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211165166.XA CN115451392A (en) | 2022-09-23 | 2022-09-23 | Steam generator using electrode boiler and control method thereof |
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| CN115451392A true CN115451392A (en) | 2022-12-09 |
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| CN103438591A (en) * | 2013-08-30 | 2013-12-11 | 华北电力大学 | Novel trench-type solar recirculating heat collection system |
| EP3460207A1 (en) * | 2017-09-20 | 2019-03-27 | E.ON Energy Projects GmbH | Steam generator unit with power to heat function |
| CN109578966A (en) * | 2018-12-04 | 2019-04-05 | 杭州联赫节能环保技术有限公司 | A kind of heat pipe evaporator |
| CN110397907A (en) * | 2019-08-21 | 2019-11-01 | 浙江力聚热水机有限公司 | A kind of immersion electrode steam boiler |
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2022
- 2022-09-23 CN CN202211165166.XA patent/CN115451392A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438591A (en) * | 2013-08-30 | 2013-12-11 | 华北电力大学 | Novel trench-type solar recirculating heat collection system |
| EP3460207A1 (en) * | 2017-09-20 | 2019-03-27 | E.ON Energy Projects GmbH | Steam generator unit with power to heat function |
| CN109578966A (en) * | 2018-12-04 | 2019-04-05 | 杭州联赫节能环保技术有限公司 | A kind of heat pipe evaporator |
| CN110397907A (en) * | 2019-08-21 | 2019-11-01 | 浙江力聚热水机有限公司 | A kind of immersion electrode steam boiler |
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