CN104930506A - Automatic identification method capable of utilizing proportion of alcohol-based fuel for controlling intelligent combustor to be ignited - Google Patents
Automatic identification method capable of utilizing proportion of alcohol-based fuel for controlling intelligent combustor to be ignited Download PDFInfo
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- CN104930506A CN104930506A CN201510232875.9A CN201510232875A CN104930506A CN 104930506 A CN104930506 A CN 104930506A CN 201510232875 A CN201510232875 A CN 201510232875A CN 104930506 A CN104930506 A CN 104930506A
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- alcohol
- group fuel
- intelligent burner
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- fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2207/00—Ignition devices associated with burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2208/00—Control devices associated with burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/06—Sampling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Control Of Combustion (AREA)
Abstract
The invention discloses an automatic identification method capable of utilizing the proportion of alcohol-based fuel for controlling an intelligent combustor to be ignited, and belongs to the field of biomass new energy. The method comprises the following steps of (1) presetting a starting condition; (2) preparing the alcohol-based fuel with different proportions; (3) mounting a pycnometer and a sensor controller; and (4) obtaining a detection signal, and controlling the intelligent combustor to be ignited. Salt and organic solvents are added into the alcohol-based fuel, and the alcohol-based fuel with the different proportions is obtained; through proportion sensing, ignition of the intelligent combustor is controlled, and the self automatic identification control aim is achieved; the alcohol-based fuel from abnormal channels are not combusted in the intelligent combustor, and the aims of protecting a formula of the alcohol-based fuel and protecting the intellectual property of the combustor are achieved; and meanwhile, the alcohol-based fuel from a normal channel is ensured, the fuel is safely and effectively used, and the toxic pollution and the fire risks to a customer are avoided.
Description
Technical field
The present invention relates to a kind of automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire, specifically, be the unlatching of the specific gravity sensor Controlling solenoid valve by alcohol-group fuel, and then control intelligent burner igniting, belong to living beings new energy field.
Background technology
The fuel such as liquefied gas, natural gas, kerosene, coal tar, heavy oil, diesel oil, gasoline and coal belong to fossil energy, and alcohol-group fuel and biodiesel belong to non-fossil energy.Non-fossil energy is also referred to as biomass energy.Alcohol-group fuel is the environmental protection energy, and the most fully and completely, thermal conversion efficiency is the highest, discharges based on water and carbon dioxide in burning, is the most clean, most environmental protection in future, has the fuel of development potentiality most.Alcohol-group fuel is the fuel of main body configuration exactly with alcohols (as methyl alcohol, ethanol, propyl alcohol, butanols, amylalcohol, hexanol etc.) material.From 2008, the advantage of alcohol-group fuel caused attention in the industry, but its technical difficulty is large, synthesize the fuel compared favourably with gasoline, diesel oil, also need more advanced technical research and practice.
Bio-fuel methyl alcohol: be exactly the most simply methyl alcohol in alcohol-group fuel, it is a kind of colourless, transparent, inflammable, volatile toxic liquid, to metal non-corrosiveness (except lead, aluminium) under normal temperature, slightly alcohol smell.Molecular weight 32.04, relative density 0.792 (20/4 DEG C), fusing point-97.8 DEG C, boiling point 64.5 DEG C, combustion heat 725.76KJ/mol, flash-point 12.22 DEG C during closed-cup, self-ignition point 463.89 DEG C, vapour density 1.11, vapour pressure 13.33KPa (100mmHg, 21.2 DEG C), steam and air mixture explosion limit 6.0 ~ 36.5% (volume ratio), energy and water, ethanol, ether, benzene, ketone, halogenated hydrocarbons and other organic solvents many miscible, but it is not miscible with benzinum, heat, naked light or oxidant easy firing, volatile, transport dangerous, volatilization also can make object painted surface be corroded in way.
Bio-fuel ethanol: fairly simple in alcohol-group fuel is ethanol, and it is achromaticity and clarification liquid.There are calcination taste, easily flowing, very easily from air, absorb moisture, can dissolve each other with arbitrary proportion with water and the multiple organic solvent such as chloroform, ether, azeotropic mixture (moisture 4.43%) can be formed with water, azeotropic point 78.15 DEG C, relative density 0.789 (20/4 DEG C), fusing point-114.1 DEG C, boiling point 78.5 DEG C, index of refraction (n
20 d) 1.361, during closed-cup, flash-point 13 DEG C, inflammable, and steam and air can form explosive mixture, explosion limit 3.5 ~ 18.0% (volume).
Densimeter, another name densitometer floats over according to Archimedes' principle and object the condition that liquid level balances to make, and is a kind of instrument measuring fluid density.It is an airtight glass tube; one end even thickness; inwall posts scale paper, and scale is uneven, upper thin lower close; other end is slightly expanded in blister; little lead button or mercury are housed in bubble, make glass tube vertically in detected liquid can be immersed in enough degree of depth, and can stably float in a liquid; namely when it is subject to any shake, can automatically revert to vertical resting position.When densimeter floating in a liquid time, the gravity of the liquid that itself gravity arranges with it is equal, so immerse the different degree of depth in different liquid, suffered pressure is different, and densimeter utilizes this relation scale exactly.
Intelligent burner, refers to a key igniting intelligent burner, i.e. the all-in-one of the program control adjustable design such as fuel flow rate, intake and piezoelectron igniting.At present, no matter be domestic or external, it is no matter the investigation and application comparison surface of alcohol-group fuel or intelligent burner, there is no alcohol-group fuel and the application of intelligent burner correspondence, because mutually automatically do not identify system, cause the shoddy alcohol-group fuel of improper channel to spread unchecked, such as damaged intelligent burner, surrounding enviroment etc. when polluting fuel combustion, the wrong understanding causing many people to apply alcohol-group fuel, extends the speed that alcohol-group fuel is applied.
Summary of the invention
The object of the invention is to solve the deficiencies in the prior art, a kind of automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire is provided.The present invention adds salt and organic solvent in alcohol-group fuel; obtain the alcohol-group fuel of different specific weight; the igniting of intelligent burner by densimeter sensing control; teaching display stand identifies the object of control automatically; the alcohol-group fuel of improper channel is not burnt in intelligent burner, reaches the object of protection alcohol-group fuel formula and burner intellectual property, ensure that the alcohol-group fuel of normal channels simultaneously; make it use safely and effectively, avoid the poisoning pollution and the disaster hidden-trouble that cause client.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire, comprises the steps:
(1) preset unlocking condition: select densimeter, sensing controler is preset the bound detected;
(2) alcohol-group fuel of different specific weight is prepared:
1. get 0.001 ~ 0.5g salt, 1 ~ 20mL water, by soluble in water for described salt, then add 1 ~ 20mL organic solvent, stir >=60 minutes continuously, mix, obtain solution A;
2. 10 ~ 200mL methyl alcohol, 10 ~ 180mL ethanol is got, after stirring, obtain solution B, be placed in water-bath again, constant temperature 20 ~ 50 DEG C, continuously stirring at low speed, while solution A was joined in solution B in≤30 minutes, then add 1 ~ 60mL intersolubility auxiliary agent, Keep agitation >=60 minute, obtain different specific weight alcohol-group fuel;
(3) densimeter and sensing controler are installed: be sent at alcohol-group fuel in the process of intelligent burner and densimeter and sensing controler are installed, the automatic identification of igniting is realized by fuel liquid storage tank, front end magnetic valve, transfer line, rear end magnetic valve and the intelligent burner connected successively, be connected with electric wire between densimeter and sensing controler, densimeter be arranged in wet tank or be arranged in transfer line or be arranged in intelligent burner, sensing controler being fixedly mounted near fuel liquid storage tank;
(4) detection signal is obtained, control intelligent burner whether to light a fire: adopt step (3) described densimeter to step (2) gained alcohol-group fuel examinations, obtain detection signal, whether the size of detection signal described in automatic decision and the described default upper limit of detection of step (1) and lower limit, control intelligent burner by the described sensing controler of step (3) and light a fire; When described detection signal is not when detecting within the scope of bound, front end magnetic valve and rear end magnetic valve are not all opened, then intelligent burner misfires; When detection signal is when detecting within the scope of bound, front end magnetic valve and rear end magnetic valve are all opened, and described alcohol-group fuel flows to intelligent burner, then intelligent burner igniting.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the described presetting mode of step (1) is voltage or electric current, and the upper limit of described voltage detecting is 100mV, lower limit is 1mV, and the upper limit of described current detecting is 100mA, lower limit is 1mA.
Further, step (2) 1. described in salt be one or more in sodium chloride, potassium chloride, sodium sulphate, described organic solvent is one or more in ethylene glycol, glycerine, toluene, benzinum, polyoxy butanols.
Further, step (2) 1. described in the weight of salt be 0.2g, the volume of described water is 5mL, and the volume of described organic solvent is 5mL.
Further, the consumption of described salt is 0.01 ~ 1% of alcohol-group fuel percentage by volume, and the consumption of described organic solvent is 5 ~ 15% of alcohol-group fuel percentage by volume.
Further, step (2) 2. described in intersolubility auxiliary agent be one or more in water, n-hexyl alcohol, formic acid, glycerine, ethylene glycol.
Further, step (2) 2. described in the volume of methyl alcohol be 120mL, described ethanol contend is 20mL, and the volume of described intersolubility auxiliary agent is 10mL.
Further, the consumption of described intersolubility auxiliary agent is 3 ~ 12% of alcohol-group fuel percentage by volume.
Further, the proportion of described alcohol-group fuel is 0.8 ~ 1.5, and described open-cup flash point is 20 ~ 50 DEG C.
The invention has the beneficial effects as follows:
1. the present invention adds salt and organic solvent in alcohol-group fuel; obtain the alcohol-group fuel of different specific weight; the igniting of intelligent burner by densimeter sensing control; teaching display stand identifies the object of control automatically; the alcohol-group fuel of improper channel is not burnt in intelligent burner, reaches the object of protection alcohol-group fuel formula and burner intellectual property.
2. the present invention also ensure that the alcohol-group fuel of normal channels, makes it use safely and effectively, avoids the poisoning pollution and the disaster hidden-trouble that cause client.
3. preparation method of the present invention is simple, wide market, is applicable to large-scale production.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
Detailed description of the invention
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment 1
As shown in Figure 1, the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire, comprises the steps:
(1) preset unlocking condition: select densimeter, the upper limit that predeterminated voltage detects on sensing controler is 100mV, and lower limit is 1mV;
(2) alcohol-group fuel is prepared:
1. get 0.001g sodium chloride, 1mL water, by soluble in water for described sodium chloride, then add mutual aid solvent 1mL ethylene glycol, stir 60 minutes continuously, mix, obtain solution A, wherein the amount of salt is 0.001g, and amount of liquid is 2mL;
2. get 10mL methyl alcohol, 10mL ethanol, after stirring, obtain solution B, then be placed in water-bath, constant temperature 20 ~ 50 DEG C, continuously stirring at low speed, while joined in solution B by solution A in 30 minutes, then add 1mL water, Keep agitation 60 minutes, obtains alcohol-group fuel;
Aforesaid liquid amount adds up to 23mL, and the amount of salt is 0.001g, and the consumption of salt is 0.0435% of alcohol-group fuel percentage by volume; Mutual aid solvent ethylene glycol 1mL is 4.35% of alcohol-group fuel percentage by volume, and proportion is 0.80 ~ 0.85, open-cup flash point is 28 ~ 32 DEG C;
(3) densimeter and sensing controler are installed: be sent at alcohol-group fuel in the process of intelligent burner and densimeter and sensing controler are installed, the automatic identification of igniting is realized by fuel liquid storage tank, front end magnetic valve, transfer line, rear end magnetic valve and the intelligent burner connected successively, be connected with electric wire between densimeter and sensing controler, densimeter is arranged in wet tank, sensing controler is fixedly mounted near fuel liquid storage tank;
(4) detection signal is obtained, control intelligent burner whether to light a fire: adopt step (3) described densimeter to step (2) gained alcohol-group fuel examinations, obtain detection signal, whether the size of detection signal described in automatic decision and the described default upper limit of detection of step (1) and lower limit, control intelligent burner by the described sensing controler of step (3) and light a fire; When the proportion of described alcohol-group fuel is not within 0.80 ~ 0.85 data, the voltage data of sensing setting just exceedes the scope of upper limit 100mV or lower limit 1mV, and now, front end magnetic valve and rear end magnetic valve are not all opened, then intelligent burner misfires; When detection signal is in 0.80 ~ 0.85 scope, front end magnetic valve and rear end magnetic valve are all opened, and described alcohol-group fuel flows to intelligent burner, then intelligent burner igniting.
Embodiment 2
As shown in Figure 1, the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire, comprises the steps:
(1) preset unlocking condition: select densimeter, the upper limit that predetermined current detects on sensing controler is 100mA, lower limit is 1mA;
(2) alcohol-group fuel is prepared:
1. get 0.2g potassium chloride, 5mL water, by soluble in water for described potassium chloride, then add 5mL glycerine, stir 90 minutes continuously, mix, obtain solution A, wherein the consumption of salt is 0.2g, and amount of liquid is 10mL;
2. 120mL methyl alcohol, 20mL ethanol is got, after stirring, obtain solution B, be placed in water-bath again, constant temperature 20 ~ 50 DEG C, continuously stirring at low speed, while solution A was joined in solution B in 20 minutes, then add 5mL n-hexyl alcohol, 5mL formic acid, Keep agitation 80 minutes, obtains alcohol-group fuel;
Aforesaid liquid amount amounts to 160mL, and the consumption of salt is 0.2g, and the consumption of salt is 0.13% of alcohol-group fuel percentage by volume, and proportion is 0.85 ~ 0.90, open-cup flash point is 17 ~ 23 DEG C;
(3) densimeter and sensing controler are installed: be sent at alcohol-group fuel in the process of intelligent burner and densimeter and sensing controler are installed, the automatic identification of igniting is realized by fuel liquid storage tank, front end magnetic valve, transfer line, rear end magnetic valve and the intelligent burner connected successively, be connected with electric wire between densimeter and sensing controler, densimeter is arranged in transfer line, sensing controler is fixedly mounted near fuel liquid storage tank;
(4) detection signal is obtained, control intelligent burner whether to light a fire: adopt step (3) described densimeter to step (2) gained alcohol-group fuel examinations, obtain detection signal, whether the size of detection signal described in automatic decision and the described default upper limit of detection of step (1) and lower limit, control intelligent burner by the described sensing controler of step (3) and light a fire; When the proportion of described alcohol-group fuel is not within 0.85 ~ 0.90, the voltage data of sensing setting just exceedes the scope of upper limit 100mA or lower limit 1mA, and now, front end magnetic valve and rear end magnetic valve are not all opened, then intelligent burner misfires; When detection signal is in 0.85 ~ 0.90 scope, front end magnetic valve and rear end magnetic valve are all opened, and described alcohol-group fuel flows to intelligent burner, then intelligent burner igniting.
Embodiment 3
As shown in Figure 1, the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire, comprises the steps:
(1) preset unlocking condition: select densimeter, the upper limit that predeterminated voltage detects on sensing controler is 100mV, lower limit is 1mV;
(2) alcohol-group fuel is prepared:
1. 0.3g potassium chloride, the mixture of 0.2g sodium sulphate, 20mL water is got, by soluble in water for the mixture of described potassium chloride and sodium sulphate, add the mixed liquor of 10mL toluene, 5mL benzinum and 5mL polyoxy butanols again, continuous stirring 70 minutes, mix, obtain solution A, wherein, the consumption of salt is 0.5g, and amount of liquid is 40mL;
2. 200mL methyl alcohol, 180mL ethanol is got, after stirring, obtain solution B, be placed in water-bath again, constant temperature 20 ~ 50 DEG C, continuously stirring at low speed, while solution A was joined in solution B in 25 minutes, then add the mixed liquor of 12mL water, 12mL n-hexyl alcohol, 12mL formic acid, 12mL glycerine, 12mL ethylene glycol, Keep agitation 70 minutes, obtains alcohol-group fuel.
Aforesaid liquid amount amounts to 480mL, and the consumption of salt is 0.5g, and the consumption of salt is 0.10% of alcohol-group fuel percentage by volume, and proportion is 0.90 ~ 0.95, open-cup flash point is 24 ~ 30 DEG C;
(3) densimeter and sensing controler are installed: be sent at alcohol-group fuel in the process of intelligent burner and densimeter and sensing controler are installed, the automatic identification of igniting is realized by fuel liquid storage tank, front end magnetic valve, transfer line, rear end magnetic valve and the intelligent burner connected successively, be connected with electric wire between densimeter and sensing controler, densimeter is arranged in intelligent burner, sensing controler is fixedly mounted near fuel liquid storage tank;
(4) detection signal is obtained, control intelligent burner whether to light a fire: adopt step (3) described densimeter to step (2) gained alcohol-group fuel examinations, obtain detection signal, whether the size of detection signal described in automatic decision and the described default upper limit of detection of step (1) and lower limit, control intelligent burner by the described sensing controler of step (3) and light a fire; When the proportion of described alcohol-group fuel is not within 0.90 ~ 0.95, the voltage data of sensing setting just exceedes the scope of upper limit 100mV or lower limit 1mV, and now, front end magnetic valve and rear end magnetic valve are not all opened, then intelligent burner misfires; When detection signal is in 0.90 ~ 0.95 scope, front end magnetic valve and rear end magnetic valve are all opened, and described alcohol-group fuel flows to intelligent burner, then intelligent burner igniting.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire, is characterized in that, comprise the steps:
(1) preset unlocking condition: select densimeter, sensing controler is preset the bound detected;
(2) alcohol-group fuel of different specific weight is prepared:
1. get 0.001 ~ 0.5g salt, 1 ~ 20mL water, by soluble in water for described salt, then add 1 ~ 20mL organic solvent, stir >=60 minutes continuously, mix, obtain solution A;
2. 10 ~ 200mL methyl alcohol, 10 ~ 180mL ethanol is got, after stirring, obtain solution B, be placed in water-bath again, constant temperature 20 ~ 50 DEG C, continuously stirring at low speed, while solution A was joined in solution B in≤30 minutes, then add 1 ~ 60mL intersolubility auxiliary agent, Keep agitation >=60 minute, obtain different specific weight alcohol-group fuel;
(3) densimeter and sensing controler are installed: be sent at alcohol-group fuel in the process of intelligent burner and densimeter and sensing controler are installed, the automatic identification of igniting is realized by fuel liquid storage tank, front end magnetic valve, transfer line, rear end magnetic valve and the intelligent burner connected successively, be connected with electric wire between densimeter and sensing controler, densimeter be arranged in wet tank or be arranged in transfer line or be arranged in intelligent burner, sensing controler being fixedly mounted near fuel liquid storage tank;
(4) detection signal is obtained, control intelligent burner whether to light a fire: adopt step (3) described densimeter to step (2) gained alcohol-group fuel examinations, obtain detection signal, whether the size of detection signal described in automatic decision and the described default upper limit of detection of step (1) and lower limit, control intelligent burner by the described sensing controler of step (3) and light a fire; When described detection signal is not when detecting within the scope of bound, front end magnetic valve and rear end magnetic valve are not all opened, then intelligent burner misfires; When detection signal is when detecting within the scope of bound, front end magnetic valve and rear end magnetic valve are all opened, and described alcohol-group fuel flows to intelligent burner, then intelligent burner igniting.
2. the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire according to claim 1, it is characterized in that, the described presetting mode of step (1) is voltage or electric current, the upper limit of described voltage detecting is 100mV, lower limit is 1mV, and the upper limit of described current detecting is 100mA, lower limit is 1mA.
3. the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire according to claim 1, it is characterized in that, step (2) 1. described in salt be one or more in sodium chloride, potassium chloride, sodium sulphate, described organic solvent is one or more in ethylene glycol, glycerine, toluene, benzinum, polyoxy butanols.
4. the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire according to claim 1, it is characterized in that, step (2) 1. described in the weight of salt be 0.2g, the volume of described water is 5mL, and the volume of described organic solvent is 5mL.
5. the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire according to claim 4, it is characterized in that, the consumption of described salt is 0.01 ~ 1% of alcohol-group fuel percentage by volume, and the consumption of described organic solvent is 5 ~ 15% of alcohol-group fuel percentage by volume.
6. the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire according to claim 1, it is characterized in that, step (2) 2. described in intersolubility auxiliary agent be one or more in water, n-hexyl alcohol, formic acid, glycerine, ethylene glycol.
7. the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire according to claim 1, it is characterized in that, step (2) 2. described in the volume of methyl alcohol be 120mL, described ethanol contend is 20mL, and the volume of described intersolubility auxiliary agent is 10mL.
8. the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire according to claim 7, is characterized in that, the consumption of described intersolubility auxiliary agent is 3 ~ 12% of alcohol-group fuel percentage by volume.
9. the automatic identifying method utilizing alcohol-group fuel specific gravity control intelligent burner to light a fire according to any one of claim 1-8, is characterized in that, the proportion of described alcohol-group fuel is 0.8 ~ 1.5, and described open-cup flash point is 20 ~ 50 DEG C.
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| CN112120269A (en) * | 2020-10-22 | 2020-12-25 | 云南省烟草农业科学研究院 | Alcohol-based fuel for tobacco curing and curing method for improving appearance quality of tobacco leaves |
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Denomination of invention: Automatic identification method capable of utilizing proportion of alcohol-based fuel for controlling intelligent combustor to be ignited Effective date of registration: 20190708 Granted publication date: 20170811 Pledgee: Bank of China Limited by Share Ltd Guilin branch Pledgor: Guilin Ganlong EP Technology Co., Ltd. Registration number: 2019450000029 |