CN112774566A - Production process and system of propylene glycol type solar low-temperature heat utilization working medium - Google Patents

Production process and system of propylene glycol type solar low-temperature heat utilization working medium Download PDF

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CN112774566A
CN112774566A CN202110179368.9A CN202110179368A CN112774566A CN 112774566 A CN112774566 A CN 112774566A CN 202110179368 A CN202110179368 A CN 202110179368A CN 112774566 A CN112774566 A CN 112774566A
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feeding
propylene glycol
working medium
pipeline
pigment
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程庆来
柴永峰
贾利凯
李碧柳
李城序
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China Tianchen Engineering Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80Forming a predetermined ratio of the substances to be mixed
    • B01F35/83Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
    • B01F35/833Flow control by valves, e.g. opening intermittently
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/60Safety arrangements
    • B01F35/605Safety devices concerning the operation of the mixer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80Forming a predetermined ratio of the substances to be mixed
    • B01F35/88Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/883Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using flow rate controls for feeding the substances
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/08Materials not undergoing a change of physical state when used
    • C09K5/10Liquid materials

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Abstract

The invention provides a production process and a system of a propylene glycol type solar low-temperature heat utilization working medium, wherein the working medium comprises the following components in percentage by mass, and propylene glycol is 40-50%; 47-57% of deionized water; 2.2 to 3.6 percent of additive; 0.1 to 0.2 percent of pigment; the production process and the system of the propylene glycol type solar low-temperature heat utilization working medium only use common chemical equipment such as pipelines, valves, flow meters, pipe cleaners and the like, can continuously produce, do not use special materials and import equipment, have a simple system and are low in investment cost.

Description

Production process and system of propylene glycol type solar low-temperature heat utilization working medium
Technical Field
The invention belongs to the technical field of chemical process, and particularly relates to a production process and a system of a propylene glycol type solar low-temperature heat utilization working medium.
Background
Solar energy utilization is an important field of renewable resource utilization, and the most mature product of global solar energy low-temperature heat utilization belongs to a solar water heater at present. The solar water heater industry in China forms a mutually matched industrial chain of mechanical equipment, raw material processing, marketing, installation service and the like, and a plurality of famous brand enterprises are emerged.
Compared with a vacuum tube solar water heater, the flat plate solar water heater has the advantages of good safety, easy integrated installation with a building, strong pressure resistance in the application fields of urban residential users and engineering, and more obvious advantages of being suitable for a pressure-bearing system. Since 2010, the research and development of the flat-plate solar water heater break through the technical and structural defects of the initial product, the market sales in China is increased year by year, and the flat-plate solar water heater occupies about 30-40% of the market share in China at present; in the European and American markets, the flat-plate solar water heater occupies more than 90% of the market share.
The operation of the flat plate solar water heater usually needs to heat the heat-conducting working medium first, and the heat collector absorbs heat energy and conducts the heat energy to the heat-conducting working medium. Along with the rise of the temperature of the heat-conducting working medium, the heated liquid working medium is heated in the heat collector under the action of the circulation of the pump, then enters the heat exchanger of the water storage tank to transfer heat energy to the living water through heat exchange, and the heat-conducting working medium is gradually cooled after heat transfer. The cooled heat-conducting working medium is returned to the heat collector and is heated again in the heat collecting plate. This process is repeated until the domestic water in the water storage tank is heated to the set temperature.
The heat conducting working medium in the flat-plate solar water heater is called as solar low-temperature heat utilization working medium in the field of scientific research. The propylene glycol type solar low-temperature heat utilization working medium has the natural advantages of high temperature resistance, low freezing point, no volatility, weak metal corrosion, difficult oxidation, long service life, low price, easy obtainment and the like, and is widely applied to flat-plate solar water heaters. Jiangfu et al in the patent Heat transfer Medium for solar Water heaters (patent No. 201410063609.3) propose a method for preparing a heat transfer medium for solar Water heaters by adding additives such as polymaleic anhydride, alginic acid, borax and the like into propylene glycol and mixing in a batch reactor. The heat exchange medium for the solar water heater produced by the method enhances the metal corrosion inhibition effect and prolongs the service life, but the production process adopts an intermittent production mode of physically mixing the reaction kettles, has lower production efficiency and is not beneficial to large-scale batch production. Furthermore, the price of the organic carboxylic acid synthesized by polymaleic anhydride, alginic acid and the like is higher, and the production cost is increased. In addition, additives such as borax and the like are harmful to human bodies and are not intrinsically safe heat transfer working media, which is more unfavorable for popularization and promotion of products.
In conclusion, a novel and efficient continuous production process and system are urgently needed to be developed in the production of the solar low-temperature heat utilization working medium, so that the production efficiency and the automation level of the preparation process of the propylene glycol type solar low-temperature heat utilization working medium are improved.
Disclosure of Invention
In view of the above, one of the objectives of the present invention is to provide a propylene glycol type solar low-temperature heat utilization working medium, which comprises the following components by mass:
Figure BDA0002941720780000021
preferably, the additive is a mixture of sebacic acid, disodium hydrogen phosphate, sodium nitrate, sodium benzoate, benzotriazole and potassium hydroxide, wherein the mass percentage of each component is as follows:
Figure BDA0002941720780000022
Figure BDA0002941720780000031
preferably, the pigment is one of lemon yellow, weak acid green, weak acid blue and carmine.
The invention also provides a production system of the propylene glycol type solar low-temperature heat utilization working medium, which comprises a propylene glycol feeding pipeline, a deionized water feeding pipeline, an additive feeding pipeline and a pigment feeding pipeline, wherein the additive feeding pipeline comprises an additive feeding pipe main path and a plurality of additive feeding pipe branch paths, the additive feeding pipe branch paths are communicated with the additive feeding pipe main path, the pigment feeding pipeline comprises a pigment feeding pipe main path and a plurality of pigment feeding pipe branch paths, the pigment feeding pipe branch paths are communicated with the pigment feeding pipe main path, the propylene glycol feeding pipeline, the deionized water feeding pipeline, the additive feeding pipe main path and the pigment feeding pipe main path are communicated with a mixing pipeline, a pipe cleaner is arranged in the mixing pipeline, and the mixing pipeline is communicated with an inlet of a working medium product tank
Preferably, the additive feeding pipe branch comprises a sebacic acid feeding pipe branch, a disodium hydrogen phosphate feeding pipe branch, a sodium nitrate feeding pipe branch, a sodium benzoate feeding pipe branch, a benzotriazole feeding pipe branch and a potassium hydroxide feeding pipe branch; the pigment feeding pipe branch comprises a lemon yellow feeding pipe branch, a weak acid green feeding pipe branch and a weak acid blue feeding pipe branch;
the propylene glycol feeding pipeline is communicated with the starting point of the pipe cleaner, the deionized water pipeline, the additive feeding pipe main path and the pigment feeding pipe main path are communicated with the middle point of the pipe cleaner, and the inlet of the working medium product tank is communicated with the end point of the pipe cleaner;
after the order is finished, a pigging ball is launched from the starting point of the pipe cleaner to the ending point of the pipe cleaner, and all materials remained in the mixing pipe are cleaned out and enter a final product, so that the proportion precision of each component in the previous production mixing process is ensured, the residue does not influence the next production mixing process, and the cross contamination is avoided;
the propylene glycol feeding pipeline, the deionized water feeding pipeline, the pigment feeding pipe branch and the additive feeding pipe branch are respectively provided with a feeding flow meter, a feeding flow regulating valve and a feeding automatic switch valve.
Preferably, the material of the feed flowmeter, the material of the feed flow regulating valve, the material of the feed automatic switch valve and the material of the feed pipeline are all stainless steel.
The feeding flowmeter, the flow regulating valve and the feeding switch valve are all commercially available products.
The feeding flowmeter on the feeding pipeline is a high-precision flowmeter, and the type of the feeding flowmeter can be selected from a Micro Motion F series Coriolis flowmeter manufactured by Emerson, an RCCT39 series mass flowmeter manufactured by the Yanghe company, and a Proline PromassF 300 series mass flowmeter manufactured by E + H company.
The third purpose of the invention is to provide a production method of the propylene glycol type solar low-temperature heat utilization working medium, which comprises the following steps:
s1: calculating the mass percentage of each component according to the performance requirement of the solar low-temperature heat utilization working medium and the yield of the working medium, determining the adding time and sequence of each additive, pigment, propylene glycol and deionized water, and determining the adding flow of each additive, pigment, propylene glycol and deionized water, wherein automatic feeding switch valves on a propylene glycol feeding pipeline and a deionized water feeding pipeline are opened firstly, and under the action of a feeding flow meter and a feeding flow regulating valve, the propylene glycol and the deionized water are fed and mixed at the same time according to a certain proportion;
s2: when the feeding amounts of the propylene glycol and the deionized water reach 30-50% of the calculated values, the feeding automatic switch valves on the additive feeding pipe branches and the pigment feeding pipe branches are opened, and after the feeding of the additives and the pigments is finished, the feeding automatic switch valves on the additive feeding pipe branches and the pigment feeding pipe branches are closed;
s3: when the feeding amount of the propylene glycol and the deionized water reaches 90% of the calculated value, the opening degree of flow regulating valves on a propylene glycol feeding pipeline and a deionized water feeding pipeline is regulated, and the feeding speed of the propylene glycol and the deionized water is reduced;
s4: and when the feeding amounts of the propylene glycol and the deionized water reach 100 percent of the calculated value, closing the feeding switch valves on the propylene glycol feeding pipeline and the deionized water feeding pipeline.
Preferably, after the additives and the pigments are fed in step S2 for 1-10min, the feeding automatic switch valves on each additive feeding pipe branch and each pigment feeding pipe branch are closed.
Preferably, the operating temperature of the working medium is normal temperature-60 ℃, and the operating pressure is 0.2-0.5 MPaG.
Compared with the prior art, the production process and the system of the propylene glycol type solar low-temperature heat utilization working medium have the following beneficial effects:
1. according to the production process and the system of the propylene glycol type solar low-temperature heat utilization working medium, a borax additive harmful to a human body is not used, no harm is caused to the human body and the environment even if leakage occurs, only common chemical equipment such as a pipeline, a valve, a flowmeter and a pipe cleaner is used, no special material and imported equipment are used, the system is simple, and the investment cost is low;
2. compared with the reaction kettle type mixed intermittent production process, the production process and the system of the propylene glycol type solar low-temperature heat utilization working medium realize continuous production, obviously improve the production efficiency, adopt pipeline conveying and mixing in the whole process, avoid the need of multiple times of material pouring when the reaction kettle is used, and reduce material leakage and loss;
3. according to the production process and the system of the propylene glycol type solar low-temperature heat utilization working medium, online mixing is realized through proportional flow control, mechanical stirring is not needed, the production cost is reduced, meanwhile, the risk that workers suffer mechanical injury is avoided, and the production process is safer;
4. the production process and the system of the propylene glycol type solar low-temperature heat utilization working medium have the advantages that the automation degree of the process system is high, and the adding and mixing processes of materials such as propylene glycol, deionized water, additives, pigments and the like are all automatically controlled.
5. According to the production process and system of the propylene glycol type solar low-temperature heat utilization working medium, the pipe cleaner is arranged on the mixing pipeline, so that the residual quantity is reduced to the greatest extent, and cross contamination is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow diagram of a process and a system for producing a propylene glycol type solar low-temperature heat utilization working medium according to an embodiment of the present invention.
Description of reference numerals:
the code numbers of the automatic control instrument and the valve in the figure 1 are as follows:
an FT 101-propylene glycol feed flow meter; FT 102-deionized water feed flow meter; an FT 111-sebacic acid feed flow meter; FT 112-disodium phosphate feed flow meter; FT 113-sodium nitrate feed flow meter; FT 114-sodium benzoate feed flow meter; a FT 115-benzotriazole feed flow meter; FT 116-potassium hydroxide feed flow meter; FT 121-lemon yellow feed flow meter; FT 122-Weak acid Green feed flowmeter; FT 123-weak acid blue feed flow meter;
FV 101-propylene glycol feed flow control valve; FV 102-deionized water feed flow control valve; FV 111-sebacic acid feed flow regulating valve; FV 112-disodium hydrogen phosphate feed flow control valve; FV 113-sodium nitrate feed flow regulating valve; FV 114-sodium benzoate feed flow control valve; FV 115-benzotriazole feeding flow regulating valve; FV 116-potassium hydroxide feed flow control valve; FV 121-lemon yellow feed flow regulating valve; FV 122-weak acid green feed flow regulating valve; FV 123-weak acid blue feed flow regulating valve;
an automatic XV 101-propylene glycol feeding switch valve; XV 102-deionized water feed automatic on-off valve; an automatic charge switching valve for XV 111-sebacic acid; an XV 112-disodium hydrogen phosphate feed automatic on-off valve; an automatic charge switch valve for XV 113-sodium nitrate; XV 114-sodium benzoate feeding automatic switch valve; an automatic charging on-off valve of XV 115-benzotriazole; an XV 116-Potassium hydroxide feed automatic on-off valve; an XV 121-lemon yellow feeding automatic switch valve; XV 122-Weak acid Green feed auto-on-off valve; an XV 123-weak acid blue feeding automatic switch valve;
PS 131-pig start point; PS132-PS134 pig midpoint; PS 135-pig termination point;
in FIG. 1, the material code is: 201-propylene glycol feed; 202-deionized water feed; 211-sebacic acid feed; 212-disodium hydrogen phosphate feed; 213-sodium nitrate feed; 214-sodium benzoate feed; 215-benzotriazole feeding; 216-potassium hydroxide feed; 221-lemon yellow feed; 222-weak acid green feed; 223-weak acid blue feed; 231-mixing materials; 232-discharging the product.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
All numerical designations such as temperature, pressure, length, mass, flow, including ranges, are approximations. It is to be understood, although not always explicitly stated that all numerical designations are preceded by the term "about". It is also to be understood that, although not always explicitly recited, the reagents described herein are merely exemplary and equivalents thereof are known in the art.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
According to the order requirement, 50 tons of propylene glycol solar low-temperature heat utilization working medium with the freezing point not higher than-20 ℃ and yellow apparent color is produced. Firstly, determining the mass ratio of each component in the working medium as follows: 43% of propylene glycol and 54% of deionized water; the mass ratio of the additive is as follows: 0.5% of sebacic acid, 0.8% of disodium hydrogen phosphate, 0.2% of sodium nitrate, 0.4% of sodium benzoate, 0.4% of benzotriazole and 0.6% of potassium hydroxide; 0.1 percent of pigment (lemon yellow). Secondly, feeding propylene glycol and deionized water in the same proportion, adding sebacic acid, disodium hydrogen phosphate and potassium hydroxide when the feeding amount of the propylene glycol is 35% of the calculated value, then adding sodium nitrate, sodium benzoate and benzotriazole, and finally adding pigment lemon yellow. Third, when the amount of propylene glycol and deionized water added reaches 90% of the calculated amount, the control system automatically reduces the feed rate of propylene glycol and deionized water for accurate metering. When the feeding amount of each component reaches 100 percent of the calculated value, the automatic switch valve on each feeding pipeline is immediately and automatically closed. Fourthly, the tube cleaning ball is launched from the starting point of the tube cleaner to the end point of the tube cleaner, all materials remained in the mixing tube are cleaned out and enter a final product, and the production task is finished.
The propylene glycol type solar low-temperature heat utilization working medium product produced at this time is subjected to chemical analysis to obtain the following data and conclusion: the ice point is-21.2 ℃, the boiling point is 102.8 ℃, the pH value is 7.8, the appearance is free of precipitates and suspended matters, the product is clear, transparent and bright yellow, and has no pungent smell, and the product quality meets the requirements of NB/T34073-2018.
Example 2
The propylene glycol type solar low-temperature heat utilization working medium production process and system provided by the invention have the same operation process as that of the embodiment 1 in the embodiment 2. Example 2 differs from example 1 in that:
according to the order requirement, 80 tons of propylene glycol type solar low-temperature heat utilization working medium with the freezing point not higher than-25 ℃ and green apparent color is produced. Firstly, determining the mass ratio of each component in the working medium as follows: 44.8% of propylene glycol and 52.2% of deionized water; the mass ratio of the additive is as follows: 0.7 percent of sebacic acid, 0.7 percent of disodium hydrogen phosphate, 0.4 percent of sodium nitrate, 0.3 percent of sodium benzoate, 0.2 percent of benzotriazole and 0.6 percent of potassium hydroxide; pigment (weak acid green) 0.1%. Secondly, the propylene glycol and the deionized water are fed in the same proportion, sebacic acid, disodium hydrogen phosphate and potassium hydroxide are added when the feeding amount of the propylene glycol is 38% of the calculated value, then sodium nitrate, sodium benzoate and benzotriazole are added, and finally pigment weak acid green is added.
The propylene glycol type solar low-temperature heat utilization working medium product produced at this time is subjected to chemical analysis to obtain the following data and conclusion: the ice point is-25.8 ℃, the boiling point is 103.2 ℃, the pH value is 7.8, the appearance is free of precipitates and suspended matters, the product is clear, transparent and light green, and has no pungent smell, and the product quality meets the requirements of NB/T34073-2018.
Example 3
The propylene glycol type solar low-temperature heat utilization working medium production process and the propylene glycol type solar low-temperature heat utilization working medium production system are the same as the operation process of the embodiment 1 in the embodiment 3. Example 3 differs from example 1 in that:
according to the order requirement, 100 tons of propylene glycol solar low-temperature heat utilization working medium with the freezing point not higher than-30 ℃ and blue apparent color is produced. Firstly, determining the mass ratio of each component in the working medium as follows: 46.3% of propylene glycol and 50.7% of deionized water; the mass ratio of the additive is as follows: 0.7 percent of sebacic acid, 0.7 percent of disodium hydrogen phosphate, 0.4 percent of sodium nitrate, 0.3 percent of sodium benzoate, 0.2 percent of benzotriazole and 0.6 percent of potassium hydroxide; pigment (weak acid blue) 0.1%. Secondly, feeding propylene glycol and deionized water in the same proportion, adding sebacic acid, disodium hydrogen phosphate and potassium hydroxide when the feeding amount of the propylene glycol is 40% of the calculated value, then adding sodium nitrate, sodium benzoate and benzotriazole, and finally adding pigment weak acid blue.
The propylene glycol type solar low-temperature heat utilization working medium product produced at this time is subjected to chemical analysis to obtain the following data and conclusion: the ice point is-30.9 ℃, the boiling point is 103.8 ℃, the pH value is 7.7, the appearance is free of precipitates and suspended matters, the product is clear, transparent and light blue, and has no pungent smell, and the product quality meets the requirements of NB/T34073-2018.
Example 4
The propylene glycol type solar low-temperature heat utilization working medium production process and the propylene glycol type solar low-temperature heat utilization working medium production system have the same operation process as that of the embodiment 1 in the embodiment 4. Example 4 differs from example 1 in that:
according to the order requirement, 150 tons of propylene glycol solar low-temperature heat utilization working medium with the freezing point not higher than-35 ℃ and red apparent color is produced. Firstly, determining the mass ratio of each component in the working medium as follows: 48.5 percent of propylene glycol and 48.5 percent of deionized water; the mass ratio of the additive is as follows: 0.7 percent of sebacic acid, 0.7 percent of disodium hydrogen phosphate, 0.4 percent of sodium nitrate, 0.3 percent of sodium benzoate, 0.2 percent of benzotriazole and 0.6 percent of potassium hydroxide; pigment (carmine) 0.1%. Secondly, feeding propylene glycol and deionized water in the same proportion, adding sebacic acid, disodium hydrogen phosphate and potassium hydroxide when the feeding amount of the propylene glycol is 42% of the calculated value, then adding sodium nitrate, sodium benzoate and benzotriazole, and finally adding pigment carmine.
The propylene glycol type solar low-temperature heat utilization working medium product produced at this time is subjected to chemical analysis to obtain the following data and conclusion: the ice point is-36.1 ℃, the boiling point is 104.2 ℃, the pH value is 7.7, the appearance is free of precipitates and suspended matters, the product is clear, transparent and pink, and has no pungent smell, and the product quality meets the requirements of NB/T34073-2018.
Comparative example
The production process of the heat exchange medium for the conventional solar water heater is a reaction kettle type mixed intermittent production process, and comprises the following specific operation steps:
(1) pumping 550kg of propylene glycol into a first reaction kettle, starting the first reaction kettle to stir, then adding 4kg of benzotriazole, 1kg of dry polymaleic acid, 1kg of alginic acid and 0.5kg of simethicone, and stirring for 30 minutes to completely dissolve various additives;
(2) 439kg of deionized water is pumped into a second reaction kettle, the second reaction kettle is started for stirring, then 3kg of borax and 2kg of sodium benzoate are added, stirring is carried out for 30 minutes to completely dissolve various additives, the mixed solution in the first reaction kettle and the second reaction kettle is pumped into a third reaction kettle, the third reaction kettle is started for stirring, 0.1kg of sodium hydroxide is added, the pH value is adjusted to 8.8, 0.2kg of brilliant blue dye is added, stirring is continued for 30 minutes to finally form a blue transparent solution, and sub-packaging can be carried out after the blue transparent solution is inspected to be qualified and filtered through a filter of 0.5-1 um.
Compared with the comparative example, the invention has the advantages of low investment of the production process and the system, investment of the equipment such as the feeding pipeline, the feeding flow regulating valve, the feeding flowmeter, the pipe cleaner and the like within 100 ten thousand yuan, annual output of the invention can reach 10 ten thousand tons, and in addition, the invention has no material pouring loss because the pipeline is used in the whole process and the material pouring process is not needed.
The batch production process of the reaction kettle of the comparative example at least needs 3 reaction kettles, 3 stirrers, 3 material transfer pumps, corresponding feeding pipelines, valves, electrical equipment and the like, the equipment investment is more than 200 ten thousand yuan, the annual output is less than 5 ten thousand tons, and the batch production process of the reaction kettles used in the comparative example needs material pouring, and the material pouring loss rate is about 1%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The propylene glycol type solar low-temperature heat utilization working medium is characterized in that: the working medium comprises the following components in percentage by mass:
Figure FDA0002941720770000011
2. the propylene glycol type solar low-temperature heat utilization working medium according to claim 1, characterized in that: the additive is a mixture of sebacic acid, disodium hydrogen phosphate, sodium nitrate, sodium benzoate, benzotriazole and potassium hydroxide, wherein the mass percent of each component is as follows:
Figure FDA0002941720770000012
3. the propylene glycol type solar low-temperature heat utilization working medium according to claim 1, characterized in that: the pigment is one of lemon yellow, weak acid green, weak acid blue and carmine.
4. The production system of the propylene glycol type solar low-temperature heat utilization working medium as claimed in any one of claims 1 to 3, characterized in that: including propylene glycol charge-in pipeline, deionized water charge-in pipeline, additive charge-in pipeline and pigment charge-in pipeline, the additive charge-in pipeline includes an additive inlet pipe main road and a plurality of additive inlet pipe branch roads, and a plurality of additive inlet pipe branch roads all communicate with additive inlet pipe main road, pigment charge-in pipeline includes a pigment inlet pipe main road and a plurality of pigment inlet pipe branch roads, and a plurality of pigment inlet pipe branch roads all communicate with pigment inlet pipe main road, and propylene glycol charge-in pipeline, deionized water charge-in pipeline, additive inlet pipe main road and pigment inlet pipe main road all communicate with the mixing line, are equipped with the pig in the mixing line, and the mixing line communicates with the entry of working medium product jar.
5. The production system of the propylene glycol type solar low-temperature heat utilization working medium according to claim 4, characterized in that: the additive feeding pipe branch comprises a sebacic acid feeding pipe branch, a disodium hydrogen phosphate feeding pipe branch, a sodium nitrate feeding pipe branch, a sodium benzoate feeding pipe branch, a benzotriazole feeding pipe branch and a potassium hydroxide feeding pipe branch; the pigment feeding pipe branch comprises a lemon yellow feeding pipe branch, a weak acid green feeding pipe branch and a weak acid blue feeding pipe branch;
the propylene glycol feeding pipeline is communicated with the starting point of the pipe cleaner, the deionized water pipeline, the additive feeding pipe main path and the pigment feeding pipe main path are communicated with the middle point of the pipe cleaner, and the inlet of the working medium product tank is communicated with the end point of the pipe cleaner;
the propylene glycol feeding pipeline, the deionized water feeding pipeline, the pigment feeding pipe branch and the additive feeding pipe branch are respectively provided with a feeding flow meter, a feeding flow regulating valve and a feeding automatic switch valve.
6. The production system of the propylene glycol type solar low-temperature heat utilization working medium according to claim 4 or 5, characterized in that: the material of feeding flowmeter, feeding flow control valve, feeding automatic switch valve and feeding pipeline is stainless steel material.
7. The production system of the propylene glycol type solar low-temperature heat utilization working medium according to claim 6, characterized in that: the feed flowmeter is a high-precision flowmeter.
8. The production method of the propylene glycol type solar low-temperature heat utilization working medium as claimed in any one of claims 1 to 3, characterized in that: the method comprises the following steps:
s1: calculating the mass percentage of each component according to the performance requirement of the solar low-temperature heat utilization working medium and the yield of the working medium, determining the adding time and sequence of each additive, pigment, propylene glycol and deionized water, and determining the adding flow of each additive, pigment, propylene glycol and deionized water, wherein automatic feeding switch valves on a propylene glycol feeding pipeline and a deionized water feeding pipeline are opened firstly, and under the action of a feeding flow meter and a feeding flow regulating valve, the propylene glycol and the deionized water are fed and mixed at the same time according to a certain proportion;
s2: when the feeding amounts of the propylene glycol and the deionized water reach 30-50% of the calculated values, the feeding automatic switch valves on the additive feeding pipe branches and the pigment feeding pipe branches are opened, and after the feeding of the additives and the pigments is finished, the feeding automatic switch valves on the additive feeding pipe branches and the pigment feeding pipe branches are closed;
s3: when the feeding amount of the propylene glycol and the deionized water reaches 90% of the calculated value, the opening degree of flow regulating valves on a propylene glycol feeding pipeline and a deionized water feeding pipeline is regulated, and the feeding speed of the propylene glycol and the deionized water is reduced;
s4: and when the feeding amounts of the propylene glycol and the deionized water reach 100 percent of the calculated value, closing the feeding switch valves on the propylene glycol feeding pipeline and the deionized water feeding pipeline.
9. The production method of the propylene glycol type solar low-temperature heat utilization working medium according to claim 8, characterized by comprising the following steps: and after the additives and the pigments in the S2 are fed for 1-10min, the feeding automatic switch valves on the additive feeding pipe branches and the pigment feeding pipe branches are closed.
10. The production method of the propylene glycol type solar low-temperature heat utilization working medium according to claim 8, characterized by comprising the following steps: the operating temperature of the working medium is normal temperature-60 ℃, and the operating pressure is 0.2-0.5 MPaG.
CN202110179368.9A 2021-02-09 2021-02-09 Production process and system of propylene glycol type solar low-temperature heat utilization working medium Pending CN112774566A (en)

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