CN211953262U - Electrode type boiler for heating molten salt - Google Patents
Electrode type boiler for heating molten salt Download PDFInfo
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- CN211953262U CN211953262U CN202020440354.9U CN202020440354U CN211953262U CN 211953262 U CN211953262 U CN 211953262U CN 202020440354 U CN202020440354 U CN 202020440354U CN 211953262 U CN211953262 U CN 211953262U
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Abstract
The utility model discloses an electrode boiler of heating fused salt, include: a housing formed with an accommodation chamber; the low-temperature molten salt distribution header extends into the accommodating cavity and is vertically arranged and can spray molten salt to at least one direction; and an electrode heating unit comprising an electrically connectable electrode plate arranged in the accommodation chamber in a direction substantially parallel to the low-temperature molten salt distribution header, the electrode plate being capable of communicating and heating molten salt when molten salt is injected thereto and capable of cutting off communication and stopping heating when no molten salt is injected thereto. The utility model discloses a fused salt is as conducting medium and to fused salt direct heating's technique and equipment, can effectively satisfy the heating requirement of energy storage application.
Description
Technical Field
The utility model relates to an energy storage technology field, more specifically say, relate to an electrode boiler that provides possible heating fused salt for the electrical heating fused salt carries out extensive heat-retaining.
Background
Along with the increasing installed power of wind power and photovoltaic unstable power supplies in China, the capacity of the coal-fired generator assembling machine is limited, so that the output of unstable and discontinuous power supplies in the whole power grid is greatly increased year by year, the condition can not cause great threat to the safe operation of the power grid, and the power of the power generation side cannot follow the increase of the load of the power utilization side, so that the power supply capacity is insufficient. The current countermeasure is peak shaving by using a coal-fired power plant or a large number of newly-added wind power photovoltaic installations. However, when the installed capacity of wind power and photovoltaic exceeds the regulation capacity of the power grid, wind and light are abandoned. In order to reduce the phenomenon of wind and light abandonment, people propose to consume the wind and light abandonment through a plurality of energy storage modes such as batteries, water pumping, compressed air and the like. However, the battery energy storage technology has problems of service life, safety and the like, and meanwhile, the energy storage cost is still extremely high, and the large-scale application condition is not met. The pumped storage cost is lower, the technology is mature, but the construction site is limited by water resources and geographical conditions, and the popularization and the application are limited. The compressed air energy storage has high cost and also has no engineering popularization and application.
The fused salt energy storage has the advantages of flexible site selection, high heat storage efficiency, large heat storage capacity and the like, and the problems of other energy storage technologies can be effectively solved by utilizing the fused salt energy storage. However, the energy storage of the molten salt requires the use of a wind and light abandoning power supply to heat the molten salt for storage and standby. The method can be divided into resistance heating, induction heating, arc heating, electron beam heating, infrared heating, medium heating and the like according to different electric energy conversion modes.
The conventional electrode boiler is usually used for heating water/steam, is limited by conditions such as water vapor physical parameters and equipment manufacturing, and is generally not more than 250 ℃ in the temperature of a heating working medium, so that the conventional electrode boiler is usually used for a heating system, and is poor in economical efficiency and limited in popularization and application due to the fact that a mode of utilizing abandoned wind and abandoned light power sources to generate electricity through heat storage is adopted. In addition, mechanical sealing forms such as sealing rings, spring washers and the like are generally adopted among insulators of the insulating sleeve of the existing jet-flow type electrode boiler, and as the operation time is increased, the molten salt fails in the sealing mode.
Disclosure of Invention
To the problem that exists among the prior art, the utility model provides an electrode boiler that can adopt electrode method heating fused salt adopts this technique can effectively solve the not high problem of current electrode boiler heating temperature, carries out extensive heat-retaining for the electrical heating fused salt and provides a practical technique and equipment.
The utility model provides an electrode boiler of heating fused salt, include:
a housing forming an accommodating chamber;
the low-temperature molten salt distribution header extends into the accommodating cavity and is vertically arranged and can spray molten salt to at least one direction;
and an electrode heating unit comprising an electrically connectable electrode plate arranged in the accommodation chamber in a direction substantially parallel to the low-temperature molten salt distribution header, the electrode plate being capable of communicating and heating molten salt when molten salt is injected thereto and capable of cutting off communication and stopping heating when no molten salt is injected thereto.
According to the utility model discloses an embodiment of electrode boiler of heating fused salt, the input of low temperature fused salt distribution collection case passes through low temperature fused salt flow control valve and links to each other with fused salt pump and low temperature fused salt storage tank, and the output of low temperature fused salt distribution collection case stretches into from the casing bottom and holds the chamber and spray the fused salt.
According to the utility model discloses an embodiment of electrode boiler of heating fused salt, the output of low temperature fused salt distribution header has at least one row of nozzle of arranging along length direction, at least one row of nozzle can be to at least one direction injection fused salt.
According to the utility model discloses an embodiment of the electrode boiler of heating fused salt, electrode heating unit is still including setting up the high voltage bushing joint on the casing, high voltage bushing joint has the power incoming end that is located outside the casing and is located the plate electrode incoming end and the connection of casing power incoming section and the intermediate junction section of plate electrode incoming end.
According to the utility model discloses an embodiment of the electrode boiler of heating fused salt, high voltage bushing connects's power incoming end and abandon the wind and abandon the light power and link to each other, the plate electrode links to each other with high voltage bushing connects's plate electrode incoming end.
According to the utility model discloses an embodiment of electrode boiler of heating fused salt, the plate electrode includes positive plate and negative plate and separation the guiding gutter of positive plate and negative plate, the guiding gutter can receive the fused salt that low temperature fused salt distribution collection case sprayed and form the fused salt flow with positive plate and negative plate switch-on and heat the route.
According to an embodiment of the electrode boiler for heating molten salt of the present invention, the intermediate connection section of the high voltage bushing joint comprises an electrode lead-in and an insulating bushing arranged outside the electrode lead-in, the insulating bushing comprising an outer insulator, an intermediate insulator and an inner insulator; and the power supply access end of the high-voltage sleeve joint is also provided with a ventilation pipe seat which is internally filled with gas.
According to the utility model discloses an embodiment of the electrode boiler of heating fused salt, the electrode boiler is still including setting up the plate electrode below at electrode heating unit and being used for preventing by the counter electrode board that discharges and puncture, counter electrode board ground connection sets up.
According to the utility model discloses an embodiment of electrode boiler of heating fused salt, the bottom of casing is provided with high temperature fused salt export takeover, high temperature fused salt export takeover links to each other with high temperature fused salt storage tank through high temperature fused salt liquid level control valve.
According to the utility model discloses an embodiment of electrode boiler of heating fused salt, still be provided with on the casing to holding the chamber and introducing the casing of interior pressure and fill the pressure tube socket and carry out the casing unloading tube socket of pressure release to holding the chamber, still be provided with the level gauge on the casing.
Compared with the prior art, the utility model discloses the electrode boiler of heating fused salt can effectively solve the problem that current electric boiler starts slowly, power density is low, solves the not enough problem of heating temperature through the extension runner simultaneously, adopts gaseous steady voltage technique to guarantee that fused salt efflux route is stable to utilize the gas seal to solve the unsmooth problem of solidifying of fused salt in service.
Drawings
Fig. 1 shows a schematic structural view of an electrode boiler heating molten salt according to an exemplary embodiment of the present invention.
Fig. 2 shows a schematic structural view of a high voltage casing joint in an electrode boiler heating molten salt according to an exemplary embodiment of the present invention.
Fig. 3 shows a schematic structural view of an electrode plate in an electrode boiler heating molten salt according to an exemplary embodiment of the present invention.
Description of reference numerals:
1-shell, 2-electrode plate, 3-low temperature fused salt, 4-counter electrode plate, 5-high temperature fused salt, 6-high temperature fused salt outlet connecting pipe, 7-high temperature fused salt liquid level control valve, 8-low temperature fused salt flow control valve, 9-nozzle, 10-low temperature fused salt distribution header, 11-shell pressurizing pipe seat, 12-liquid level meter, 13-shell emptying pipe seat, 14-high voltage sleeve joint, 15-vent pipe seat, 16-external insulator, 17-intermediate insulator, 18-internal insulator and 19-electrode leading-in end.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The molten salt has a very low vapor pressure (about several Pa), and can be heated at a high temperature under normal pressure, which makes it possible to increase the size and temperature of the electric boiler. Simultaneously, the technique and the equipment that utilize to abandon wind to abandon light heating fused salt need satisfy that heating power is big (tens MW level), heating power density is high, heating temperature is even, load control range is wide, load response speed is fast, long service life, requirement such as heating efficiency height, so the utility model discloses a technique and the equipment of resistance-type direct heating fused salt satisfy the heating requirement of energy storage application.
Specifically, the resistance heating is an electric heating method which converts electric energy into heat energy by utilizing joule effect of current, the resistance heating is the most mature electric heating method applied to the widest technology, and is generally divided into direct heating and indirect heating, the direct heating is to directly heat voltage to an object to be heated, when current flows through the object to be heated, the object to be heated is used as resistance heating, and the heat energy is applied to the object to be heated, belongs to internal heating, and is higher in heating efficiency. Indirect resistance heating requires a special heating element, and heat energy generated by the heating element is transferred to an object to be heated by radiation, convection, conduction and other modes.
The electrode type boiler for heating molten salt according to the present invention will be described in detail hereinafter.
Fig. 1 shows a schematic structural view of an electrode boiler heating molten salt according to an exemplary embodiment of the present invention.
As shown in fig. 1, according to an exemplary embodiment of the present invention, the electrode type boiler for heating molten salt mainly includes a casing 1, a low temperature molten salt distribution header 9, and an electrode heating unit. Wherein, casing 1 is the main structure spare of boiler and is used for holding the fused salt and installs other main assembly, and low temperature fused salt distribution header 9 is used for inputing and distributing low temperature fused salt in to the casing, and electrode heating unit then utilizes abandoning wind and abandoning the photoelectric source or other energy sources to become high temperature fused salt with low temperature fused salt heating.
Specifically, the housing 1 forms a receiving cavity having a predetermined volume to receive the molten salt.
The low-temperature molten salt distribution header 8 extends into the accommodating cavity and is vertically arranged and can inject molten salt to at least one direction. As shown in fig. 1, the input end of the low-temperature molten salt distribution header 8 is connected with a molten salt pump and a low-temperature molten salt storage tank (not shown) through a low-temperature molten salt flow control valve 8, and the output end of the low-temperature molten salt distribution header 8 extends into the containing cavity from the bottom of the shell 1 to inject the low-temperature molten salt 3. Preferably, low temperature fused salt distribution collection case 8 is L shape structure, and the output has certain length and vertical arrangement in holding the chamber, specifically can control the low temperature fused salt volume and pressure, height isoparametric that get into in low temperature fused salt distribution collection case 8 through fused salt pump and low temperature fused salt capacity control valve 8, realizes the fused salt injection control of different height and different volume from this.
Wherein the output end of the low-temperature molten salt distribution header 9 has at least one row of nozzles 9 arranged along the length direction, the at least one row of nozzles being capable of injecting molten salt in at least one direction. For example, there may be 2 to 5 rows of nozzles arranged along the length, each row including 10 to 20 nozzles, different rows of nozzles may inject molten salt toward different directions, and different nozzles in each row may inject molten salt at different heights. Specifically, a molten salt pump is used for sending low-temperature molten salt 3 higher than the melting point of the molten salt into the low-temperature molten salt distribution header 10, and the molten salt is input into the accommodating cavity in a mode of being sprayed out from the low-temperature molten salt distribution header 10.
The electrode heating unit comprises in particular an electrically connectable electrode plate 2 arranged in the housing cavity along a direction substantially parallel to the low temperature molten salt distribution header 10, the electrode plate 2 being capable of communicating and heating the molten salt when molten salt is injected thereon and of cutting off communication and stopping heating when no molten salt is injected thereon. That is, when low temperature fused salt 3 sprays to the electrode plate 2 that is located the casing inside from low temperature fused salt distribution header 10, because the fused salt is the conductor, the low temperature fused salt that sprays flows through electrode plate 2 from top to bottom after with the electrode plate intercommunication, and low temperature fused salt 3 relies on fused salt self resistance to be heated gradually to required temperature in the flow process, and the high temperature fused salt 5 after being heated relies on the dead weight to flow out and send to equipment such as holding tank.
When the low-temperature molten salt distribution header 9 is provided with a plurality of rows of nozzles which spray in different directions, a plurality of groups of electrode heating units are arranged to correspond to the nozzles, so that the molten salt is efficiently heated.
Fig. 2 shows a schematic structural view of a high voltage casing joint in an electrode boiler heating molten salt according to an exemplary embodiment of the present invention.
As shown in fig. 2, the electrode heating unit of the present invention further includes a high voltage bushing 14 disposed on the housing 1, wherein the high voltage bushing 14 has a power inlet located outside the housing 1 and a plate electrode inlet located inside the housing 1 and an intermediate connecting section connecting the power inlet and the plate electrode inlet. In particular, the intermediate connection section of the high voltage bushing terminal 14 comprises an electrode lead-in 19 and an insulating bushing arranged outside the electrode lead-in. Since the high voltage bushing terminal 14 assumes the function of power supply connection, it is necessary that the insulating bushing has a good insulating function in order to prevent the electrodes from being connected through the boiler body. The utility model discloses an insulation support includes external insulator 16, middle insulator 17 and internal insulator 18 to the best quality is sealed to the realization.
Preferably, in order to prevent the exchange of gas inside and outside the boiler and avoid the problem that mechanical seal is easy to lose efficacy, the utility model discloses seal through filling the area pressure gas between the insulator on the insulation support sealing mode. Specifically, the power supply connection end of the high-voltage casing joint 14 is further provided with a ventilation pipe seat 15 for introducing gas inwards, and the inside and the outside of the electrode boiler are isolated by introducing appropriate pressure gas, so that the electrode boiler can be further sealed.
The utility model discloses a high voltage bushing connects 14's power incoming end can abandon the light power with abandoning wind and link to each other, and plate electrode 2 then links to each other with high voltage bushing connects 14's plate electrode incoming end.
Fig. 3 shows a schematic structural view of an electrode plate in an electrode boiler heating molten salt according to an exemplary embodiment of the present invention.
As shown in fig. 3, according to a preferred embodiment of the present invention, the electrode plate 2 comprises a positive plate and a negative plate and a guiding groove for separating the positive plate and the negative plate, the guiding groove can receive the molten salt injected by the low-temperature molten salt distribution header and connect the positive plate and the negative plate to form a molten salt flowing heating path. The diversion trench can prolong the heating time of the low-temperature molten salt, and is arranged in an S shape or a zigzag shape. The positive electrode plate and the negative electrode plate are not connected to each other, but once the molten salt is injected into the flow guide grooves of the electrode plate, the molten salt serves as a conductor to connect the positive electrode plate and the negative electrode plate to form a passage, and the molten salt itself becomes a resistor and is heated.
In addition, the electrode type boiler may further include a counter electrode plate 4 disposed below the electrode plate 2 of the electrode heating unit and preventing the discharge breakdown, and the counter electrode plate 4 is disposed to be grounded for protecting personal and equipment safety.
The bottom of casing 1 is provided with high temperature fused salt export takeover 6, and high temperature fused salt export takeover 6 links to each other with high temperature fused salt storage tank (not shown) through high temperature fused salt level control valve 7, and the liquid level of high temperature fused salt 5 in casing 1 can be adjusted through high temperature fused salt level control valve 7, and liquid level feedforward signal is provided by level gauge 12 that sets up on casing 1.
The utility model discloses a still be provided with on casing 1 and to holding the chamber and introducing the casing of interior pressure and pressurize tube socket 11 and carry out the casing unloading tube socket 13 of pressure release to holding the chamber. In order to ensure that the pressure of a fused salt outlet is constant and low-temperature fused salt jet flow meets the design requirement, certain internal pressure needs to be applied to the shell 1, the internal pressure is introduced by the shell pressurizing pipe seat 11, and when the fused salt in the shell 1 needs to be discharged completely, an air source on the shell pressurizing pipe seat 11 is closed and the shell emptying pipe seat 13 is communicated with the atmosphere.
In order to ensure that the low-temperature molten salt 3 does not generate thermal shock on the electrode boiler under the working condition of cold starting, the electrode boiler needs to be preheated, the preheating mode is that water with pressure is heated in the electrode boiler to 220-260 ℃, then the water in the shell is discharged completely, and then the low-temperature molten salt 3 is added for heating and warming.
The low-temperature molten salt 3 that needs to be heated enters the low-temperature molten salt distribution header 10 through the low-temperature molten salt flow control valve 7, the molten salt in the low-temperature molten salt distribution header 10 is sprayed out after reaching a certain liquid level, a passage is formed when the low-temperature molten salt 3 flows through the electrode plate 2, the low-temperature molten salt becomes a resistor to be heated, the liquid level of the low-temperature molten salt 3 in the low-temperature molten salt distribution header 10 is adjusted through the low-temperature molten salt flow control valve 8, and therefore the contact between the low-temperature molten salt 3 and the electrode plate 2 is changed, and. The heated low-temperature molten salt 3 is collected into the shell 1 along the electrode plate 2 by means of gravity to become high-temperature molten salt 5, and the liquid level of the high-temperature molten salt 5 in the shell 1 is regulated and output through the high-temperature molten salt level control valve 7.
The present invention will be further described with reference to the following examples.
Example (b):
taking an electrode boiler with rated thermal power of 40MW as an example, low-temperature molten salt 3 at 300 ℃ is sent to a low-temperature molten salt distribution header 10, and the flow rate of the low-temperature molten salt is 580 kg/s. 3 rows of nozzles are arranged on the low-temperature molten salt distribution header, each row is provided with sixteen nozzles 9, the flow of each nozzle is 12.08kg/s, the nozzle flow velocity is 3m/s, and the radius of each nozzle is 15 mm.
In order to ensure that the phenomena of cutoff and the like do not occur in the high-temperature liquid level in the shell, the height of the liquid level in the shell is controlled to be 0.8m, and the working pressure of the shell is 0.1 MPa.
When the electrode boiler is 50% of rated power, the flow of low-temperature molten salt is 290kg/s, the liquid level in the distribution header is controlled to be sprayed out from eight rows of nozzles at the lower part, so that the contact area of the molten salt and the electrode is reduced by half, the operation of 50% of power is protected and maintained, and the power of the molten salt electrode boiler can be adjusted in a stepless mode through the flow of the molten salt.
In summary, the electrode boiler for heating the fused salt by using the electrode method can effectively solve the problem of low heating temperature of the current electrode boiler, and provides a practical technology and equipment for large-scale heat storage of the electrically heated fused salt; in the sealing mode of the insulating sleeve, pressurized gas is filled between the insulators for sealing, so that the problem that mechanical sealing is prone to failure can be solved.
The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. An electrode boiler for heating molten salt, comprising:
a housing forming an accommodating chamber;
the low-temperature molten salt distribution header extends into the accommodating cavity and is vertically arranged and can spray molten salt to at least one direction;
and an electrode heating unit comprising an electrically connectable electrode plate arranged in the accommodation chamber in a direction substantially parallel to the low-temperature molten salt distribution header, the electrode plate being capable of communicating and heating molten salt when molten salt is injected thereto and capable of cutting off communication and stopping heating when no molten salt is injected thereto.
2. An electrode boiler for heating molten salt according to claim 1, wherein the input end of the low-temperature molten salt distribution header is connected with a molten salt pump and a low-temperature molten salt storage tank through a low-temperature molten salt flow control valve, and the output end of the low-temperature molten salt distribution header extends into the containing cavity from the bottom of the shell to spray molten salt.
3. An electrode boiler for heating molten salt as claimed in claim 2, wherein the output of the low temperature molten salt distribution header has at least one row of nozzles arranged along the length, the at least one row of nozzles being capable of injecting molten salt in at least one direction.
4. An electrode boiler heating molten salts as claimed in claim 1, characterized in that the electrode heating unit further comprises a high voltage bushing joint provided on the casing, the high voltage bushing joint having a power supply access outside the casing and an electrode plate access inside the casing and an intermediate connection section connecting the power supply access and the electrode plate access.
5. An electrode boiler for heating molten salt as claimed in claim 4, wherein the power supply access end of the high voltage casing joint is connected with a wind and light abandoning power supply, and the electrode plate is connected with the electrode plate access end of the high voltage casing joint.
6. An electrode boiler for heating molten salt as claimed in claim 1 or 5, wherein the electrode plates include positive and negative electrode plates and a gutter separating the positive and negative electrode plates, the gutter being capable of receiving molten salt injected from the low temperature molten salt distribution header and communicating the positive and negative electrode plates to form a molten salt flow heating path.
7. An electrode boiler heating molten salt as claimed in claim 4, characterized in that the intermediate connection section of the high voltage bushing joint comprises an electrode lead-in and an insulating bushing arranged outside the electrode lead-in, the insulating bushing comprising an outer insulator, an intermediate insulator and an inner insulator; and the power supply access end of the high-voltage sleeve joint is also provided with a ventilation pipe seat which is internally filled with gas.
8. An electrode boiler for heating molten salt as claimed in claim 1, further comprising a counter electrode plate disposed below the electrode plate of the electrode heating unit and for preventing breakdown by electric discharge, the counter electrode plate being disposed to be grounded.
9. An electrode boiler for heating molten salt as claimed in claim 1, characterized in that the bottom of the shell is provided with a high-temperature molten salt outlet connection pipe, and the high-temperature molten salt outlet connection pipe is connected with a high-temperature molten salt storage tank through a high-temperature molten salt level control valve.
10. An electrode boiler for heating molten salt as claimed in claim 1, wherein the shell is further provided with a shell pressurizing tube seat for introducing internal pressure into the accommodating cavity and a shell emptying tube seat for decompressing the accommodating cavity, and the shell is further provided with a liquid level meter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020440354.9U CN211953262U (en) | 2020-03-31 | 2020-03-31 | Electrode type boiler for heating molten salt |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020440354.9U CN211953262U (en) | 2020-03-31 | 2020-03-31 | Electrode type boiler for heating molten salt |
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| CN211953262U true CN211953262U (en) | 2020-11-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115060070A (en) * | 2022-06-23 | 2022-09-16 | 北新建材(陕西)有限公司 | Temperature cycle control using system for heating cold water by using waste heat of dryer |
-
2020
- 2020-03-31 CN CN202020440354.9U patent/CN211953262U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115060070A (en) * | 2022-06-23 | 2022-09-16 | 北新建材(陕西)有限公司 | Temperature cycle control using system for heating cold water by using waste heat of dryer |
| CN115060070B (en) * | 2022-06-23 | 2024-03-15 | 北新建材(陕西)有限公司 | Temperature circulation control using system for heating cold water by utilizing waste heat of dryer |
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