CN113803701A - Solid heat storage electric boiler coupling salt production system and power grid peak regulation and frequency modulation method - Google Patents
Solid heat storage electric boiler coupling salt production system and power grid peak regulation and frequency modulation method Download PDFInfo
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- 239000007787 solid Substances 0.000 title claims abstract description 178
- 238000005338 heat storage Methods 0.000 title claims abstract description 154
- 150000003839 salts Chemical class 0.000 title claims abstract description 113
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008878 coupling Effects 0.000 title claims abstract description 21
- 238000010168 coupling process Methods 0.000 title claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 43
- 230000008020 evaporation Effects 0.000 claims abstract description 43
- 238000009825 accumulation Methods 0.000 claims abstract description 21
- 230000018044 dehydration Effects 0.000 claims abstract description 21
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 21
- 238000000746 purification Methods 0.000 claims abstract description 7
- 239000012267 brine Substances 0.000 claims description 36
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical group O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 230000008569 process Effects 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- 239000011449 brick Substances 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- 239000003546 flue gas Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 230000009191 jumping Effects 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 4
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 4
- 239000004571 lime Substances 0.000 abstract description 4
- 229910052736 halogen Inorganic materials 0.000 abstract description 2
- 150000002367 halogens Chemical class 0.000 abstract description 2
- 239000012629 purifying agent Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000007738 vacuum evaporation Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000011232 storage material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
-
- 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
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/47—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to abnormal temperature, e.g. actuated by fusible plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The invention discloses a solid heat storage electric boiler coupling salt production system and a power grid peak regulation and frequency modulation method, wherein the solid heat storage electric boiler coupling salt production system comprises a solid heat storage electric boiler and a salt production device, and the solid heat storage electric boiler is connected with the salt production device; utilizing peak-shaving frequency modulation surplus power of a power grid or a power plant to heat a solid heat accumulator to realize heat accumulation, and further generating hot air or hot steam to be supplied to an evaporation unit, a dehydration unit or a drying unit of the salt manufacturing device; the purification unit is connected with the lime supply unit or the activated carbon supply unit, and the lime or the activated carbon is used as a purifying agent to purify the original halogen; the salt making device utilizes hot air or steam generated by a solid heat storage electric boiler as a heat source for evaporation, dehydration or drying. The invention has simple structure, utilizes the peak-adjusting frequency-adjusting surplus electric power to supply power for the solid heat-storage electric boiler, and uses the solid heat-storage electric boiler to provide a heat source for the salt making device, thereby improving the consumption of the peak-adjusting frequency-adjusting surplus electric power and reducing the production cost of salt making.
Description
Technical Field
The invention relates to the field of electric boilers and salt production processes, in particular to a solid heat storage electric boiler coupling salt production system and a power grid peak-load regulation and frequency modulation method.
Background
Salt is a necessity of human life, is a basic raw material in chemical industry, and has wide application in other industrial departments and agriculture, animal husbandry and fishery. The ideal target pursued by modern salt manufacturing enterprises is to reduce the energy consumption and the management cost of products; the product quality and the product comprehensive benefit are improved to achieve high quality and high price: expand product diversification to satisfy different customer's demands, increase sales volume.
Evaporative crystallization is an important operation unit of a salt making process, the mainstream technology at present is multi-effect vacuum evaporation, the number of evaporation tanks is more than two, first-effect heating steam is saturated steam sent by a thermal power plant, and heat is sequentially transferred through secondary steam of each effect to serve as a heating heat source of the next effect. The end effect exhaust steam is condensed and discharged by the circulating cooling water in the mixing condenser, and the non-condensable gas is pumped and discharged to the atmosphere by a vacuum system. However, at present, because the thermal power installation machine is excessive, most thermal power plants operate with low load, and for the thermal power plants, the pressure reduction power generation load and the peak regulation frequency modulation demand increase year by year, so that the steam parameters or the flow of the power plants for multi-effect evaporation salt production cannot meet the requirements of the salt production process.
Meanwhile, the amount of peak-shaving frequency-modulation surplus power of a thermal power plant or a thermal power plant is increased year by year, so a solution capable of consuming the peak-shaving frequency-modulation surplus power and variably consuming wind, light, water and nuclear power is urgently needed to be developed.
On the other hand, a related project of using a storage battery to participate in peak shaving frequency modulation on the load side of the power grid appears, but the storage battery has large investment and short service life, and the requirement of peak shaving frequency modulation load of the power grid cannot be met.
In view of this, the present application is specifically made.
Disclosure of Invention
The invention solves the problems that the steam parameters or flow of the existing power plant can not meet the requirements of salt production process, and the peak-shaving frequency-modulation surplus power of the power plant is gradually increased in recent years.
In order to solve the problems, the invention provides a solid heat storage electric boiler coupling salt making system which comprises a solid heat storage electric boiler and a salt making device, wherein the salt making device comprises a purification unit, an evaporation unit, a dehydration unit and a drying unit, and the solid heat storage electric boiler is connected with any one or combination of the evaporation unit, the dehydration unit and the drying unit of the salt making device; utilizing peak-shaving frequency modulation surplus power of a power grid or a power plant to heat a solid heat accumulator to realize heat accumulation, and further generating hot air or hot steam to be supplied to an evaporation unit, a dehydration unit or a drying unit of the salt making process; the evaporation unit, the dehydration unit or the drying unit realizes evaporation, dehydration or drying processes by using hot air or steam generated by the solid heat storage electric boiler as a heat source for evaporation, dehydration or drying.
Wherein the salt making device is a brine evaporation salt making device, the solid heat storage electric boiler can heat and store heat in the power supply period through the connection of the solid heat storage electric boiler and the salt making device, the heat can be continuously supplied by the residual temperature of the heated heat accumulator in the non-power supply period, the continuous heat supply of the salt manufacturing device is realized, the problem of insufficient flue gas parameters or flow in the existing power plant coupling multi-effect vacuum evaporation salt manufacturing process is solved, the salt manufacturing work can be continuously and stably carried out, meanwhile, the solid heat storage electric boiler can fully utilize the peak-shaving frequency-modulation surplus power of the power grid or the power plant for heating, effectively consumes the peak-shaving frequency-modulation surplus power of the power grid or the power plant, meanwhile, the electric network power can be utilized for heating in the low price period, the power supply cost is greatly reduced through the setting of the starting time period of the solid heat storage electric boiler, and meanwhile, the stable operation of the salt making equipment is also ensured.
Furthermore, the solid heat storage electric boiler comprises a solid heat storage electric boiler body, a power supply and control unit and a heat exchange unit; the solid heat accumulation electric boiler body comprises a heat insulation layer, a solid heat accumulator, an electric heating element, a heat exchange fan and an external heat supply pipeline.
The solid heat-storage electric boiler body is subjected to anti-corrosion treatment so as to be suitable for the surrounding environment, the heat-insulation layer can be made of multiple layers of special heat-insulation materials, the daily leakage of heat energy is controlled within 2%, the energy loss is reduced, and the stored heat energy is fully utilized.
Furthermore, the solid heat storage electric boiler is installed in a thermal power plant or a gas power plant or a nuclear power plant, and the power plant is used for peak-shaving frequency-modulation surplus electric power to supply power to the solid heat storage electric boiler.
The solid heat storage electric boiler is arranged in a power plant, and can heat the surplus electric power by fully utilizing the peak-shaving frequency-modulation of the power plant, so that the production cost is greatly reduced.
Furthermore, the solid heat storage electric boiler is installed in a transformer substation, a commercial building or an industrial park, and the surplus power is modulated by utilizing the peak shaving frequency of the power grid side or the off-peak power at night to supply power to the solid heat storage electric boiler.
Because the solid heat storage electric boiler is small in size, the solid heat storage electric boiler does not occupy too much area when being arranged in a transformer substation, a commercial building or an industrial park, can effectively utilize peak-load and frequency-modulated voltage and/or off-peak electricity on the side of a power grid to heat and store heat, and has more flexibility.
Furthermore, a temperature sensor and a temperature alarm are arranged in the solid heat storage electric boiler, so that the temperature of the solid heat storage body is monitored.
The temperature sensor and the temperature alarm can monitor the temperature of the solid heat accumulator in the boiler at any time, and guarantee is provided for safe operation of the boiler.
Furthermore, the solid heat storage electric boiler control system automatically cuts off power supply under the condition of alarm of the temperature alarm, so that the solid heat accumulator of the solid heat storage electric boiler cannot be over-heated.
The temperature sensor is connected with a power supply line, when the temperature exceeds a certain threshold value, the temperature alarm gives an alarm automatically, the boiler control system cuts off the power supply, when the temperature is lower than the certain threshold value, the boiler control system judges and determines whether to start the power supply line according to the judgment result.
Further, an air-water heat exchanger is arranged in the solid heat storage electric boiler, the air-water heat exchanger utilizes hot air to heat a heat exchange medium, the heat exchange medium is brine or water, and when the heat exchange medium is water, water vapor generated by the air-water heat exchanger is used for heating the brine.
Through wind water heat exchanger adds hot water or brine, can will fast the heat accumulation release in the solid heat accumulation electric boiler, thereby guarantee the production speed of salt manufacturing device, it is concrete, work as when the heat transfer medium is brine, brine passes through the solid heat accumulation electric boiler through wind water heat exchanger, should set up and can improve the brine temperature fast, the going on of the evaporation process of being convenient for, work as when the heat transfer medium is water, the steam that its produced is used for heating brine, and at this in-process, wind water heat exchanger only accomplishes the heat transfer through hot-blast and water, does not contact with brine, can prolong wind water heat exchanger's life.
Further, the solid heat accumulator material of the solid heat accumulation electric boiler comprises any one of solid magnesia bricks, refractory bricks, metal oxides and ceramic heat accumulators.
Wherein, the solid magnesia brick has high refractoriness, and can complete heat storage to a great extent; the refractory brick is a common heat storage material at present, so the cost is low; the decomposition/synthesis of the metal oxide is utilized to store and release heat, so that higher heat storage temperature can be obtained, and the continuous heat supply capacity of the solid heat storage electric boiler is improved; the ceramic heat accumulator is arranged in a honeycomb shape, irregular micropores are distributed on the side wall between the small holes and are communicated with each other, the micropores are communicated with each other, raw materials for manufacturing the ceramic heat accumulator can generate a large amount of far infrared rays, so that the heat efficiency of the heat accumulator is improved by more than 60 percent, and any one of the materials can be used as a heat accumulator material to obtain a good heat accumulation effect.
Furthermore, the hot air heated by the solid heat storage electric boiler enters the brine evaporation salt making system to exchange heat, and then is directly discharged to the air, or flows back to the solid heat storage electric boiler to be heated again.
Because the hot air is only used for heat exchange in the salt production device, the hot air does not contain substances which affect the environment, and can be directly discharged or recycled after being refluxed.
The invention also discloses a power grid peak regulation and frequency modulation method, which is used for the solid heat storage electric boiler coupling salt production system, and the power grid peak regulation and frequency modulation method is carried out according to the following steps:
s1: determining the installation position of the salt making system of the solid heat storage electric boiler according to the peak load regulation and frequency load demand condition of the regional power grid, and jumping to S2 if the salt making system is installed in a power plant; if the power grid is installed on the load side of the power grid, jumping to S3;
s2: arranging a solid heat storage electric boiler in a power plant, supplying power to the solid heat storage electric boiler by utilizing deep peak shaving or frequency modulation surplus power of the power plant, and using the generated hot air or steam for a brine evaporation salt making process;
s21: the method comprises the following steps that a peak-load-regulation and frequency-modulation control platform of the solid heat-storage electric boiler is arranged, is installed in a power plant centralized control room and is matched with a power plant centralized control system, so that the generated energy of a power plant, the power consumption of the solid heat-storage electric boiler and the peak-load-regulation and frequency-modulation load requirements of a power grid are matched;
s22: selecting one or more of boiler flue gas, gas turbine exhaust and steam turbine extraction as a supplementary heat source of the brine evaporation process according to the type of the power plant;
s3: a solid heat storage electric boiler is arranged on a load side of a power grid, and the load side installation position comprises any one of a transformer substation, an industrial park, a commercial building and a regional energy station;
s31: according to the peak load regulation and frequency modulation load demand condition of the load side of the power grid, setting the power of the matched solid heat storage electric boiler, and setting the scale of a brine evaporation salt making system in a matched manner;
s32: the surplus electric power and/or the low-ebb electric power are/is modulated by utilizing the peak load regulation at the load side of the power grid to supply power to the solid heat storage electric boiler, and the produced hot air or steam is used as a heat source of the brine evaporation salt making device, so that the heat load requirement of the salt making system is met.
Through this setting, can set up the connected mode of solid heat accumulation electric boiler and salt manufacturing device according to surrounding environment and facility condition to confirm the power supply mode that solid heat accumulation electric boiler inserts, make salt manufacturing device can the steady operation, and has absorbed the surplus electric power of power plant's peak regulation frequency modulation or the surplus electric power of grid load side peak regulation frequency modulation effectively, can also use the low ebb electric power to heat when peak regulation frequency modulation electric power is not enough, rationally utilizes the resource, and reduced salt manufacturing device's manufacturing cost.
Compared with the prior art, the invention has the following advantages:
1. the peak-shaving frequency-modulation surplus electric power is effectively utilized to drive the solid heat-storage electric boiler, and the heat source requirement of the brine evaporation salt-making process is stably met;
2. the electric heating has high heat efficiency, and the generated hot air or steam has high quality and can be directly applied to the production process of food salt;
3. greatly reduces the energy consumption level of the brine evaporation salt making process and reduces the energy consumption cost of the salt making process.
Drawings
Fig. 1 is a schematic structural diagram of a solid heat storage electric boiler coupled salt production system according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a solid heat storage electric boiler coupled salt production system according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a solid heat storage electric boiler coupled salt production system according to embodiment 3 of the present invention;
FIG. 4 is a schematic structural diagram of a solid heat storage electric boiler coupled salt production system according to embodiment 4 of the present invention;
fig. 5 is a flowchart of a power grid peak-shaving frequency modulation method according to embodiment 5 of the present invention.
Description of reference numerals:
1. a solid heat storage electric boiler; 101. a solid heat accumulator; 2. a purification unit; 3. an evaporation unit; 4. a dehydration unit; 5. and a drying unit.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same reference numerals are given to the same structural or functional components, and redundant description thereof is omitted. The described embodiments are merely illustrative of the inventive concept and do not limit the scope of the invention. Embodiments of the present application will be described in detail below with reference to the drawings.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be considered limiting of the scope of the present application. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The following describes a solid heat storage electric boiler coupling salt production system and a power grid peak-shaving frequency modulation method according to an embodiment of the invention with reference to the accompanying drawings.
Example 1
The embodiment provides a solid heat storage electric boiler coupling salt manufacturing system, as shown in fig. 1, which includes a solid heat storage electric boiler 1 and a salt manufacturing device, where the salt manufacturing device includes a purification unit 2, an evaporation unit 3, a dehydration unit 4 and a drying unit 5, and the solid heat storage electric boiler 1 is connected to any one or a combination of the evaporation unit 3, the dehydration unit 4 and the drying unit 5 of the salt manufacturing device; utilizing peak-shaving frequency-modulation surplus power of a power grid or a power plant to heat the solid heat accumulator 101 to realize heat accumulation, and further generating hot air or hot steam to be supplied to the evaporation unit 3, the dehydration unit 4 or the drying unit 5 of the salt manufacturing device; in the present embodiment, the purification unit 2 is connected to a lime supply unit or an activated carbon supply unit, and uses lime or activated carbon as a purifying agent to purify the raw halogen, it should be noted that other purifying media can be used in the purification unit 2; the evaporation unit 3, the dehydration unit 4 or the drying unit 5 utilize hot air or steam generated by the solid heat storage electric boiler 1 as an evaporation, dehydration or drying heat source to realize evaporation, dehydration or drying process, wherein the salt making device is a brine evaporation salt making device and is connected with the salt making device through the solid heat storage electric boiler 1, the solid heat storage electric boiler 1 can heat and store heat in a power supply period, the solid heat storage electric boiler 1 can continuously supply heat by the residual temperature of the heated solid heat storage body 101 in a non-power supply period to realize the continuous heat supply of the salt making device, the problem of insufficient smoke parameters or flow in the existing power plant coupling multi-effect vacuum evaporation salt making process is solved, the salt making work can be continuously and stably carried out, meanwhile, the solid heat storage electric boiler 1 can fully utilize the peak-adjusting and frequency-adjusting surplus electric power of the power grid or the power plant to heat, and effectively eliminate the peak-adjusting and frequency-adjusting surplus electric power of the power grid or the power plant, meanwhile, the electric network power can be utilized for heating in the low price period, the power supply cost is greatly reduced through the arrangement of the starting time period of the solid heat storage electric boiler 1, and meanwhile, the stable operation of the salt making equipment is also ensured.
In this embodiment, the solid heat storage electric boiler 1 includes a solid heat storage electric boiler body, a power supply and control unit, and a heat exchange unit; the solid heat storage electric boiler body comprises a heat insulation layer, a solid heat storage body 101, an electric heating element, a heat exchange fan and an external heat supply pipeline, the solid heat storage electric boiler body is subjected to anti-corrosion treatment so as to adapt to the surrounding environment, the heat insulation layer can be made of multiple layers of special heat insulation materials, daily leakage of heat energy is controlled within 2%, energy loss is reduced, and stored heat energy is fully utilized.
Specifically, solid heat accumulation electric boiler 1 installs in thermal power plant or gas power plant or nuclear power plant, utilizes the surplus electric power of power plant's peak regulation frequency modulation to give the power supply of solid heat accumulation electric boiler 1, but solid heat accumulation electric boiler 1 sets up and heats at the surplus electric power of peak regulation frequency modulation of the power plant of make full use of power plant, greatly reduced manufacturing cost.
As the embodiment of the invention, the solid heat storage electric boiler 1 is arranged in a transformer substation, a commercial building or an industrial park, and the peak-adjusting frequency-modulating surplus power at the side of a power grid or off-peak power at night is used for supplying power to the solid heat storage electric boiler 1, because the solid heat storage electric boiler 1 has a small volume, the solid heat storage electric boiler can be arranged in the transformer substation, the commercial building or the industrial park without occupying excessive area, and can also effectively use the peak-adjusting frequency-modulating voltage and/or off-peak power at the side of the power grid for heating and heat storage, so that the solid heat storage electric boiler has more flexibility.
Preferably, a temperature sensor and a temperature alarm are arranged in the solid heat storage electric boiler 1 to ensure the monitoring of the temperature of the solid heat storage body 101, the temperature sensor and the temperature alarm can monitor the temperature of the solid heat accumulator 101 in the boiler at any time, provide guarantee for the safe operation of the boiler, and preferably, when the solid heat storage electric boiler 1 alarms, the control system of the solid heat storage electric boiler 1 automatically cuts off power supply to ensure that the solid heat storage body 101 of the solid heat storage electric boiler 1 does not exceed the temperature, the temperature sensor is connected with a power supply line, when the temperature exceeds a certain threshold value, the temperature alarm automatically alarms, the boiler control system cuts off the power supply, when the temperature is lower than the certain threshold value, the boiler control system judges, and determining whether to start the power supply line according to the judgment result, preferably, operating according to the following steps:
a1: when the temperature is lower than a certain temperature threshold value, judging that the access place is a power plant or a power grid side, and performing A2 if the access place is the power plant; a3 is executed if the access ground is the power grid side;
a2: judging whether the peak-shaving frequency-modulation surplus power can be supplied or not, if so, starting a peak-shaving frequency-modulation surplus power supply unit; if not, alarming to prompt an operator to manually select other power supplies or execute other operations;
a3: judging whether the peak-shaving frequency-modulation surplus power can be supplied or not, if so, starting a peak-shaving frequency-modulation surplus power supply unit; otherwise, executing A31;
a31: judging whether the power supply is in a low-ebb period, if so, starting a commercial power supply unit; otherwise, alarming to prompt the operator to manually select other power supplies or execute other operations.
Preferably, the temperature sensor may be replaced with a thermostat.
In the embodiment, an air-water heat exchanger is arranged in the solid heat storage electric boiler 1, the air-water heat exchanger heats a heat exchange medium by utilizing hot air, the heat exchange medium is brine or water, when the heat exchange medium is water, the water vapor generated by the wind-water heat exchanger is used for heating the brine, the hot water or the brine is heated by the wind-water heat exchanger, the heat stored in the solid heat storage electric boiler 1 can be quickly released, thereby ensuring the production speed of the salt making device, in particular, when the heat exchange medium is brine, the brine flows through the solid heat storage electric boiler through the wind-water heat exchanger, the device can rapidly increase the temperature of brine, is convenient for the evaporation process, and when the heat exchange medium is water, the water vapor produced by the device is used for heating brine, and in the process, the wind-water heat exchanger only completes heat exchange through hot wind and water and does not contact brine, so that the service life of the wind-water heat exchanger can be prolonged.
As an embodiment of the invention, the solid heat accumulator 101 of the solid heat accumulation electric boiler 1 comprises any one of solid magnesia bricks, refractory bricks, metal oxides and ceramic heat accumulators, wherein the solid magnesia bricks have high refractoriness and can complete heat accumulation to a large extent; the refractory brick is a common heat storage material at present, so the cost is low; the decomposition/synthesis of the metal oxide is utilized to store and release heat, so that higher heat storage temperature can be obtained, and the continuous heat supply capacity of the solid heat storage electric boiler 1 is improved; the ceramic heat accumulator is arranged in a honeycomb shape, irregular micropores are distributed on the side wall between the small holes and are communicated with each other, the micropores are communicated with each other, raw materials for manufacturing the ceramic heat accumulator can generate a large amount of far infrared rays, so that the heat efficiency of the heat accumulator is improved by more than 60 percent, and any one of the materials can be used as the solid heat accumulator 101 material to obtain a good heat accumulation effect.
Specifically, the hot air after solid heat accumulation electric boiler 1 heats gets into the air after brine evaporation salt manufacturing system heat transfer and directly discharges to the sky, or the backward flow gets into solid heat accumulation electric boiler 1 and heats once more, because hot air only is used for the heat transfer in the salt manufacturing device, therefore it does not contain the material that influences the environment, can directly discharge or the backward flow back circulation use, and because hot air or the steam quality that solid heat accumulation electric boiler 1 produced are high, can directly be applied to the production of food salt.
Example 2
In the embodiment, as shown in fig. 2, compared with embodiment 1, the solid heat storage electric boiler 1 in the embodiment is arranged in a thermal power plant, a gas power plant or a nuclear power plant, and is powered by using peak-shaving frequency-modulation surplus power in the plant, the solid heat-storage electric boiler 1 can heat and store heat during the power supply period through the connection of the solid heat-storage electric boiler 1 and the salt making device, the heat can be continuously supplied by the residual temperature of the heated solid heat accumulator 101 in the non-power supply period, the continuous heat supply of the salt making device is realized, the problem of insufficient flue gas parameters or flow in the existing power plant coupling multi-effect vacuum evaporation salt making process is solved, the salt making work can be continuously and stably carried out, meanwhile, the solid heat storage electric boiler 1 can fully utilize the peak-shaving frequency-modulation surplus electric power of the power plant to heat, and effectively consumes the peak-shaving frequency-modulation surplus electric power of the power grid or the power plant.
Example 3
The embodiment provides a solid heat storage electric boiler coupling salt manufacturing system, as shown in fig. 3, compared with embodiment 1, in the embodiment, the solid heat storage electric boiler 1 is arranged in a transformer substation, a commercial building or an industrial park, and is powered by using peak-adjusting frequency-modulation surplus power in a plant, and is connected with a salt manufacturing device through the solid heat storage electric boiler 1, the solid heat storage electric boiler 1 can heat and store heat in a power supply period, and can continuously supply heat by using the residual temperature of a heated solid heat storage body 101 in a non-power supply period, so as to realize the continuous heat supply of the salt manufacturing device, solve the problem of insufficient flue gas parameter or flow in the existing multi-effect vacuum evaporation salt manufacturing process, enable the salt manufacturing work to be continuously and stably performed, and meanwhile, the solid heat storage electric boiler 1 can fully utilize the peak-adjusting surplus power for heating, and effectively eliminate the peak-adjusting frequency-modulation surplus power of a power grid or a power plant, meanwhile, the electric network power can be utilized for heating in the low price period, the power supply cost is greatly reduced through the arrangement of the starting time period of the solid heat storage electric boiler 1, and meanwhile, the stable operation of the salt making equipment is also ensured.
Example 4
The embodiment provides a solid heat storage electric boiler coupling salt manufacturing system, as shown in fig. 4, compared with embodiment 2, in the embodiment, the solid heat storage electric boiler 1 is arranged in a thermal power plant, except that the solid heat storage electric boiler 1 is connected with a salt manufacturing device, one or more of the boiler, a gas turbine and a steam turbine are also connected with the salt manufacturing device, and one or more of boiler flue gas, gas turbine exhaust and steam extraction of the steam turbine are also supplied to the salt manufacturing device to serve as a supplementary heat source of the salt manufacturing device, so that the utilization rate of high-temperature flue gas in the thermal power plant is further improved, and the salt manufacturing cost is reduced.
Example 5
The present embodiment provides a peak-load and frequency-adjustment method for a power grid, as shown in fig. 5, for a solid heat-storage electric boiler coupled salt-making system as described in embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4, where the peak-load and frequency-adjustment method for a power grid is performed according to the following steps:
s1: determining the installation position of the salt making system of the solid heat storage electric boiler according to the peak load regulation and frequency load demand condition of the regional power grid, and jumping to S2 if the salt making system is installed in a power plant; if the power grid is installed on the load side of the power grid, jumping to S3;
s2: arranging a solid heat storage electric boiler in a power plant, supplying power to the solid heat storage electric boiler by utilizing deep peak shaving or frequency modulation surplus power of the power plant, and using the generated hot air or steam for a brine evaporation salt making process;
s21: the method comprises the following steps that a peak-load-regulation and frequency-modulation control platform of the solid heat-storage electric boiler is arranged, is installed in a power plant centralized control room and is matched with a power plant centralized control system, so that the generated energy of a power plant, the power consumption of the solid heat-storage electric boiler and the peak-load-regulation and frequency-modulation load requirements of a power grid are matched;
s22: selecting one or more of boiler flue gas, gas turbine exhaust and steam turbine extraction as a supplementary heat source of the brine evaporation process according to the type of the power plant;
s3: a solid heat storage electric boiler is arranged on a load side of a power grid, and the load side installation position comprises any one of a transformer substation, an industrial park, a commercial building and a regional energy station;
s31: according to the peak load regulation and frequency modulation load demand condition of the load side of the power grid, setting the power of the matched solid heat storage electric boiler, and setting the scale of a brine evaporation salt making system in a matched manner;
s32: the method is characterized in that surplus power and/or low-ebb power are modulated by peak load regulation and frequency modulation of a power grid, power is supplied to the solid heat storage electric boiler, and produced hot air or steam is used as a heat source of a brine evaporation salt making process, so that the heat load requirement of a salt making system is met.
Through the arrangement, the connection mode of the solid heat storage electric boiler 1 and the salt making device can be set according to the surrounding environment and facility conditions, and the power supply mode accessed by the solid heat storage electric boiler 1 is determined, so that the salt making device can stably operate, the surplus power of power plant peak regulation and frequency modulation or the surplus power of power grid load side peak regulation and frequency modulation is effectively consumed, the low-valley power can be used for heating under partial conditions, resources are reasonably utilized, and the production cost of the salt making device is reduced.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A solid heat storage electric boiler coupling salt manufacturing system is characterized by comprising a solid heat storage electric boiler (1) and a salt manufacturing device, wherein the salt manufacturing device comprises a purification unit (2), an evaporation unit (3), a dehydration unit (4) and a drying unit (5),
the solid heat storage electric boiler (1) is connected with any one or combination of an evaporation unit (3), a dehydration unit (4) or a drying unit (5) of the salt making device; utilizing peak-shaving frequency-modulation surplus power of a power grid or a power plant to heat a solid heat accumulator (101) to realize heat accumulation, and further generating hot air or hot steam to be supplied to an evaporation unit (3), a dehydration unit (4) or a drying unit (5) of the salt manufacturing device;
the evaporation unit (3), the dehydration unit (4) or the drying unit (5) uses hot air or steam generated by the solid heat storage electric boiler (1) as a heat source for evaporation, dehydration or drying to realize evaporation, dehydration or drying processes.
2. The coupling salt production system of the solid heat storage electric boiler as claimed in claim 1, wherein the solid heat storage electric boiler (1) comprises a solid heat storage electric boiler body, a power supply and control unit and a heat exchange unit; the solid heat storage electric boiler body comprises a heat preservation layer, a solid heat storage body (101), an electric heating element, a heat exchange fan and an external heat supply pipeline.
3. The system for coupling the solid heat storage electric boiler with the salt production system as claimed in claim 1, wherein the solid heat storage electric boiler (1) is installed in a thermal power plant or a gas power plant or a nuclear power plant, and the solid heat storage electric boiler (1) is powered by power plant peak-shaving frequency-modulation surplus power.
4. The system for coupling the solid heat storage electric boiler to produce the salt according to claim 1, wherein the solid heat storage electric boiler (1) is installed in a substation, a commercial building or an industrial park, and the solid heat storage electric boiler (1) is powered by peak-shaving surplus electric power on the side of a power grid or off-peak electric power at night.
5. The coupled salt production system of the solid heat storage electric boiler as claimed in claim 1, wherein a temperature sensor and a temperature alarm are arranged in the solid heat storage electric boiler (1) to ensure the monitoring of the temperature of the solid heat storage body (101).
6. The system for coupling the solid heat storage electric boiler with the salt production system as claimed in claim 5, wherein the solid heat storage electric boiler (1) is automatically powered off by a control system of the solid heat storage electric boiler (1) in case of alarm of the temperature alarm, so as to ensure that the solid heat storage body (101) of the solid heat storage electric boiler (1) is not over-heated.
7. The coupling salt production system of the solid heat storage electric boiler as claimed in claim 1, wherein a wind-water heat exchanger is arranged in the solid heat storage electric boiler (1), the wind-water heat exchanger heats a heat exchange medium by hot air, the heat exchange medium is brine or water, and when the heat exchange medium is water, water vapor generated by the wind-water heat exchanger is used for heating brine.
8. The coupled solid heat storage electric boiler salt production system according to claim 1, wherein the solid heat storage body (101) material of the solid heat storage electric boiler (1) comprises any one of solid magnesia brick, refractory brick, metal oxide and ceramic heat storage body.
9. The coupling salt manufacturing system of the solid heat storage electric boiler as claimed in claim 1, wherein the hot air heated by the solid heat storage electric boiler (1) enters the air after heat exchange of the salt manufacturing device and is directly discharged to the air, or flows back to the solid heat storage electric boiler (1) to be heated again.
10. A power grid peak-load and frequency modulation method for a solid heat storage electric boiler coupled salt production system according to any one of claims 1 to 9, wherein the power grid peak-load and frequency modulation method is implemented by the following steps:
s1: determining the installation position of the salt making system of the solid heat storage electric boiler according to the peak load regulation and frequency load demand condition of the regional power grid, and jumping to S2 if the salt making system is installed in a power plant; if the power grid is installed on the load side of the power grid, jumping to S3;
s2: arranging a solid heat storage electric boiler in a power plant, supplying power to the solid heat storage electric boiler by utilizing deep peak shaving or frequency modulation surplus power of the power plant, and using the generated hot air or steam for a brine evaporation salt making process;
s21: the method comprises the following steps that a peak-load-regulation and frequency-modulation control platform of the solid heat-storage electric boiler is arranged, is installed in a power plant centralized control room and is matched with a power plant centralized control system, so that the generated energy of a power plant, the power consumption of the solid heat-storage electric boiler and the peak-load-regulation and frequency-modulation load requirements of a power grid are matched;
s22: selecting one or more of boiler flue gas, gas turbine exhaust and steam turbine extraction as a supplementary heat source of the brine evaporation process according to the type of the power plant;
s3: a solid heat storage electric boiler is arranged on a load side of a power grid, and the load side installation position comprises any one of a transformer substation, an industrial park, a commercial building and a regional energy station;
s31: according to the peak load regulation and frequency modulation load demand condition of the load side of the power grid, setting the power of the matched solid heat storage electric boiler, and setting the scale of a brine evaporation salt making system in a matched manner;
s32: the surplus electric power and/or the low-ebb electric power are/is modulated by utilizing the peak load regulation at the load side of the power grid to supply power to the solid heat storage electric boiler, and the produced hot air or steam is used as a heat source of the brine evaporation salt making device, so that the heat load requirement of the salt making system is met.
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