CN112628514B - Liquid phosphorus supply system and method for keeping liquid phosphorus stably supplied - Google Patents
Liquid phosphorus supply system and method for keeping liquid phosphorus stably supplied Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-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
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/32—Heating of pipes or pipe systems using hot fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/35—Ohmic-resistance heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
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Abstract
The invention relates to a liquid phosphorus supply system and a method for keeping stable supply of liquid phosphorus, comprising the following steps: the device comprises a phosphorus melting tank, a conveying pipeline, a heat insulation pipe for conveying steam, a steam main pipe, a steam coil, an electric heating device and a liquid pump, wherein a discharge port of the phosphorus melting tank is communicated with a feed port of the conveying pipeline; the steam coil pipe and the heating device are respectively positioned in the phosphorus melting tank, and the steam coil pipe and the heat preservation pipe are respectively communicated with the steam main pipe; the liquid pump is arranged on the conveying line and used for pumping liquid phosphorus. According to the liquid phosphorus supply system disclosed by the invention, when the steam system breaks down, the continuous supply of liquid phosphorus can be ensured, and the stability of downstream production can be ensured.
Description
Technical Field
The invention belongs to the technical field of phosphorus chemical industry production by taking yellow phosphorus as a raw material, and particularly relates to a liquid phosphorus supply system and a method for keeping stable supply of liquid phosphorus.
Background
Yellow phosphorus is an important industrial raw material, and is a colorless to yellow waxy solid, has garlic odor, and gives off light green phosphorescence in a dark place. The melting point is 44.1 ℃, the boiling point is 280.5 ℃, the property is unstable and flammable, and the spontaneous combustion can be caused and the combustion and the explosion can be caused when the air is contacted. In the chemical field, yellow phosphorus is an important chemical basic raw material for producing phosphorus pentoxide, phosphoric acid, polyphosphoric acid, polyphosphate, glufosinate-ammonium, triethyl phosphate and the like. For example, the conventional thermal phosphoric acid process is: the yellow phosphorus product is used as a raw material, the yellow phosphorus and air are oxidized and reacted to generate phosphorus pentoxide gas, and the phosphorus pentoxide gas is absorbed by water to obtain the thermal phosphoric acid product. The yellow phosphorus is directly melted by a pump and is directly conveyed to the next process, the raw material liquid phosphorus is supplied in the world at present, basically, the liquid phosphorus is directly pumped by the pump and is conveyed to the next process, in the traditional chemical production, in order to melt the solid yellow phosphorus and ensure that the yellow phosphorus is in a liquid phase flowing state, a special coal-fired boiler is required to provide a required heat source for a phosphorus melting tank, phosphorus supply equipment, pipelines and the like, the yellow phosphorus is used as a main liquid substance in a melting pipeline, the melting point of the yellow phosphorus is about 44 ℃, in order to prevent the pipeline from being blocked due to the solidification of the molten yellow phosphorus in the pipeline, a steam pipeline is generally adopted to wrap the outside of the melting pipeline behind a melting tank at present, the temperature of the melting pipeline is protected, but if a steam system fails, the yellow phosphorus in the melting pipeline quickly solidifies and the pressure of the pipeline increases after solidification, the supply mode is easy to cause pipeline breakage to cause phosphorus leakage, spontaneous combustion is quickly generated in air due to liquid phosphorus leakage to cause frequent safety accidents, meanwhile, when a pump is overhauled, spontaneous combustion is generated due to the existence of residual phosphorus when the pump is in contact with air, the safety accidents that maintainers are burned and equipment loss is increased and difficult to repair are often caused, and the supply of liquid phosphorus is stopped due to subsequent overhaul, so that the problems of downstream raw material breakage, unstable production system, poor product quality, high energy consumption and the like are caused.
Disclosure of Invention
The technical problem solved by the invention is as follows: the liquid phosphorus supply system and the method for keeping the liquid phosphorus stably supplied are provided, and the problems that downstream raw materials are broken, a production system is unstable, the product quality is poor, the energy consumption is high and the like due to unstable liquid phosphorus supply caused by steam supply failure in the prior art are solved.
The specific solution provided by the invention is as follows:
the liquid phosphorus supply system based on the invention comprises: the system comprises a phosphorus melting tank, a conveying pipeline, a heat insulation pipe for conveying steam, a steam main pipe, a steam coil, an electric heating device and a liquid pump, wherein a discharge port of the phosphorus melting tank is communicated with a feed port of the conveying pipeline, the heat insulation pipe is sleeved outside the conveying pipeline, a heat insulation interlayer is arranged between the conveying pipeline and the heat insulation pipe, the heat insulation interlayer is fixed on the outer wall of the conveying pipeline, a phase change material is filled in the heat insulation interlayer, and the phase change temperature of the phase change material is between the phosphorus melting point and the steam temperature; the steam coil pipe and the heating device are respectively positioned in the phosphorus melting tank, and the steam coil pipe and the heat preservation pipe are respectively communicated with the steam main pipe; the liquid pump is arranged on the conveying line and used for pumping liquid phosphorus.
Based on the liquid phosphorus supply system, the heat-insulating interlayer containing the phase-change material layer is wrapped on the outer wall of the conveying pipeline from the discharge port of the phosphorus melting tank to the spraying device, the outer side of the phase-change material is in a steam atmosphere, the inner layer is the conveying pipeline, when the steam system normally operates, a steam main pipe continuously conveys steam to the heat-insulating pipe to enable yellow phosphorus in the conveying pipeline to keep a molten state, when the steam system fails and can not normally supply steam, the temperature of the conveying pipeline is gradually reduced, when the temperature is lower than the phase-change temperature of the phase-change material layer, the phase-change material is changed from a liquid state to a solid state and releases heat, temperature protection is continuously provided for the conveying pipeline, time is won for overhauling the steam system, pipelines are prevented from being blocked by yellow phosphorus solidification, equipment loss and safety accidents are reduced, continuous supply of downstream liquid phosphorus is guaranteed, and after the steam system recovers, the phase-change material absorbs heat from the steam, and is changed from solid state to liquid state, and stores heat for next use; when the main steam pipe can not normally supply steam, the temperature in the phosphorus melting tank can be reduced, and the electric heating device can be opened to supply heat to the phosphorus melting tank, so that the supply of liquid phosphorus in the conveying pipeline is guaranteed. From this, but use cyclic utilization's steam system to supply heat for melting phosphorus groove and pipeline under normal condition, when steam breaks down, adopt electric heater unit to supply heat to guarantee the continuous supply of low reaches liquid phosphorus, guarantee the stability of production, after steam system resumes normally, reuse steam and be responsible for and supply heat for melting phosphorus groove and pipeline.
On the basis of the scheme, the invention can be further improved as follows:
further, the phase change temperature of the phase change material is 55-90 ℃.
The phase-change material can meet the requirement of continuously providing temperature protection for a conveying pipeline when the wanted temperature is 50-90 ℃.
Further, the phase change material is selected from Fe (NO) 3 ) 2 ·6H 2 O、Na 3 PO 4 ·12H 2 O、Na 2 P 2 O 7 ·10H 2 O、Mg(NO 3 ) 2 ·6H 2 O、MgCl 2 ·6H 2 O、Al(NO 3 ) 2 ·9H 2 O、Na 2 SO 4 ·10H 2 O or Na 2 HPO 4 ·12H 2 And O is any one or a combination of a plurality of O.
The inorganic hydrated salt phase-change material is widely applied due to the advantages of low price, high latent heat storage capacity, high heat conductivity and the like, the temperature of the phase-change material layer is higher than the melting point of phosphorus and lower than the steam temperature, the raw materials are easy to purchase, the price is low, and the inorganic hydrated salt phase-change material can be used as a heat storage phase-change material to meet the heat storage requirement.
Further, the phase change material is Fe (NO) 3 ) 2 ·6H 2 O、Na 2 P 2 O 7 ·10H 2 O69 and Mg (NO) 3 ) 2 ·6H 2 O, or a composite phase change material.
The single inorganic hydrous salt phase-change material adopted in the prior art has general supercooling and phase separation phenomena, and the composite phase-change material can realize the phase-change temperature regulation of 60-70 ℃ by regulating the proportion of all components and has larger phase-change latent heat, thermal stability and fusion degree.
Based on the liquid phosphorus supply system, the phase change material also comprises 5-30% of fatty acid.
Although a great deal of systematic research on phase change materials is carried out by relevant scholars at home and abroad in recent years, some phase change materials are commercialized, but the problems of heat storage performance, durability and the like still exist. If the phase-change material is subjected to multiple cold and hot cycles, the mixture can generate supercooling and phase separation phenomena, so that the heat storage performance of the material is reduced, and therefore, the development of the phase-change material with stable performance and large phase-change latent heat has great significance.
The single inorganic hydrous salt phase-change material adopted in the prior art has general supercooling and phase separation phenomena, the single organic phase-change material has small phase-change latent heat, different phase-change materials are selected according to different phase-change temperatures, the complexity is high, and the used phase-change material is expensive.
Further, the fatty acid is selected from one or more of stearic acid, capric acid, lauric acid or palmitic acid.
Therefore, the composite phase change material with the phase change temperature of 62-68 ℃ can be obtained based on the combination, and has large latent heat of phase change and good heat conduction performance.
In practical application, the stearic acid selected above can also be other fatty acids. The composite phase change material of the embodiment of the present invention is not limited to the stearic acid, and any other fatty acid having similar properties to stearic acid is within the scope of the embodiment of the present invention.
The device further comprises a plurality of valves and temperature sensors, wherein each valve is arranged between the heat preservation pipe and the steam main pipe, and the temperature sensors are respectively arranged in the phosphorus melting tank and the conveying pipeline.
But through the temperature reading on each temperature sensor in real time monitoring phosphorus melting groove and the pipeline, especially when steam system breaks down, steam temperature in the insulating tube and the temperature in the steam main pipe all reduce, before the temperature in the insulating tube reaches the phase change material temperature, close the insulating tube with each valve between the steam main pipe, avoid the heat of insulating tube to transmit between the steam main pipe for the heat of phase change material layer release is used for the phosphorus heating in the conveyer pipe as far as possible, prevents that it from solidifying and blockking up the conveyer pipe, thereby causes equipment damage, occurence of failure or unable normal transport liquid phosphorus.
Further, the conveying pipeline comprises a plurality of conveying pipes which are sequentially arranged along the conveying direction of the liquid phosphorus, the heat preservation pipe comprises a plurality of sleeves, one sleeve is sleeved outside each conveying pipe, the sleeves are communicated with each other, each sleeve is communicated with the steam main pipe, each sleeve and the steam main pipe are respectively provided with a plurality of electromagnetic valves, and the conveying pipes are respectively provided with the heat preservation interlayer.
Conveying pipes are arranged between a discharge hole of the phosphorus melting tank and a feed inlet of the liquid pump, between a discharge hole of the liquid pump and the spraying device and between other necessary conveying points, and a phase change material layer is wrapped around each conveying pipe, so that temperature protection is continuously provided for the conveying pipes, and the maintenance of a steam system is strived for; the sleeves are communicated with each other, so that partial heat among the sleeves is mutually transferred, the temperature among the sleeves tends to be consistent, and the conveying pipe and the liquid phosphorus are uniformly heated.
The temperature sensor, the electromagnetic valves and the electric heating device are respectively electrically connected with the control device; the temperature sensor in the phosphorus melting tank monitors the temperature of liquid phosphorus in the phosphorus melting tank and sends the temperature to the control device, and the temperature sensor in the conveying pipeline monitors the temperature of the liquid phosphorus in the conveying pipeline and sends the temperature to the control device; when the temperature in the phosphorus melting tank is reduced to a preset first threshold value, the control device controls the electric heating device to be started and maintains the temperature in the phosphorus melting tank above the first temperature, when the temperature in the conveying pipeline is reduced to the phase change temperature of the phase change material, the phase change material releases heat to supply heat for liquid phosphorus in the conveying pipe, and when the temperature in the conveying pipeline is reduced to a second threshold value, the control device controls the electric heating device to improve heating power and controls the temperature in the phosphorus melting tank to be maintained above a second temperature; the phase transition temperature is above the second threshold and below the second temperature, the first temperature is above the first threshold and below the second temperature.
According to the liquid phosphorus supply system, the temperature of liquid phosphorus in the phosphorus melting tank is monitored by the temperature sensor in the phosphorus melting tank and is sent to the control device, the temperature of the liquid phosphorus in the conveying pipeline is monitored by the temperature sensor in the conveying pipeline and is sent to the control device, and then the starting and heating power of the electric heating device is automatically controlled by the control device, so that the stable supply of the liquid phosphorus of a downstream production system is guaranteed. Specifically, after steam system breaks down, adopt electric heater unit for melting phosphorus groove heat supply, use phase change material to replace steam for the conveying line heat supply, guarantee the normal supply of liquid phosphorus in the short time after the trouble takes place, guarantee production efficiency, when the trouble duration is longer, improve electric heater unit's power, make electric heater unit for melting phosphorus groove and melt phosphorus pipeline and last the heat supply, use phase change material to reduce the unsteady of liquid phosphorus temperature in the conveying line simultaneously, guarantee long-time interior liquid phosphorus normal supply.
The invention provides a method for keeping stable supply of liquid phosphorus, which uses the liquid phosphorus supply system to convey the liquid phosphorus to a downstream production system, and specifically comprises the following steps:
adding the yellow phosphorus solid into a phosphorus melting tank for melting, and continuously supplying heat to liquid phosphorus by using a steam coil;
starting a liquid pump to convey liquid phosphorus to a downstream production system;
when steam system broke down, when unable normal transport steam in to steam coil, opened electric heater unit and carry out the heat supply for the liquid phosphorus that melts in the phosphorus groove, work as when the temperature in the pipeline falls to phase change material's phase transition temperature, phase change material release heat supplies heat for the liquid phosphorus in the pipeline to guarantee the continuous supply of liquid phosphorus, the stability of guarantee production, after steam system resumes normally, reuse steam supplies heat for melting phosphorus groove and pipeline.
Specifically, before the yellow phosphorus solid is added into the phosphorus melting tank to be melted, water is added into the phosphorus melting tank, then steam is introduced into the steam coil pipe, the steam coil pipe heats the water in the phosphorus melting tank, and then the yellow phosphorus solid is added into the phosphorus melting tank.
The melting point of the yellow phosphorus is 44 ℃, the density of the yellow phosphorus is higher than that of water, so that the yellow phosphorus can be melted, stored and immersed under water, and then the heating coil with steam is continuously utilized to continuously supply heat to liquid phosphorus in the phosphorus melting tank, so that the liquid phosphorus can be pumped normally.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flow chart according to an embodiment of the present invention.
In fig. 1, the names of the components represented by the respective reference numerals are as follows:
1. a phosphorus melting tank; 11. a discharge port;
2. a transfer line;
3. a heat preservation pipe;
4. a heat-insulating interlayer;
5. a steam coil;
6. a main steam pipe;
7. a valve;
8. an electric heating device;
9. a temperature sensor;
10. and (4) a liquid pump.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention is described below with reference to a specific embodiment in conjunction with fig. 1.
The liquid phosphorus supply system based on the invention comprises: the device comprises a phosphorus melting tank 1, a conveying pipeline 2, a heat preservation pipe 3 for conveying steam, a steam main pipe 6, a steam coil pipe 5, an electric heating device 8 and a liquid pump 10, wherein a discharge hole of the phosphorus melting tank 1 is communicated with a feed inlet of the conveying pipeline, the heat preservation pipe is sleeved outside the conveying pipeline, a heat preservation interlayer is arranged between the conveying pipeline and the heat preservation pipe, the heat preservation interlayer is fixed on the outer wall of the conveying pipeline, a phase-change material is filled in the heat preservation interlayer 4, and the phase-change temperature of the phase-change material is between the phosphorus melting point and the water vapor temperature; the steam coil pipe 5 and the heating device 8 are respectively positioned in the phosphorus melting tank 1, and the steam coil pipe 5 and the heat preservation pipe are respectively communicated with the steam main pipe 6; the liquid pump is arranged on the conveying line and used for pumping liquid phosphorus. But use cyclic utilization's steam system to supply heat for melting phosphorus groove and pipeline under normal condition, when steam breaks down, continuously provide temperature protection for pipeline through phase change material, adopt electric heater unit to supply heat to the continuous supply of guarantee low reaches liquid phosphorus, the stability of guarantee production, after steam system resumes normally, reuse steam and be responsible for supplying heat for melting phosphorus groove and pipeline.
Based on the liquid phosphorus supply system, the phase change temperature of the phase change material is 55-90 ℃.
The phase-change material can meet the requirement of continuously providing temperature protection for a conveying pipeline when the wanted temperature is 50-90 ℃.
Based on the liquid phosphorus supply system of the invention, the phase change material is selected from Fe (NO) 3 ) 2 ·6H 2 O、Na 3 PO 4 ·12H 2 O、Na 2 P 2 O 7 ·10H 2 O、Mg(NO 3 ) 2 ·6H 2 O、MgCl 2 ·6H 2 O、Al(NO 3 ) 2 ·9H 2 O、Na 2 SO 4 ·10H 2 O or Na 2 HPO 4 ·12H 2 And O is any one or a combination of a plurality of O.
The inorganic hydrated salt phase-change material is widely applied due to the advantages of low price, high volume of latent heat storage capacity, high heat conductivity and the like, the temperature of the phase-change material layer is higher than the melting point of phosphorus and lower than the steam temperature, the raw materials are easy to purchase, the price is low, and the inorganic hydrated salt phase-change material can be used as a heat storage phase-change material to meet the heat storage requirement.
According to the liquid phosphorus supply system, the phase-change material is Fe (NO) 3 ) 2 ·6H 2 O、Na 2 P 2 O 7 ·10H 2 O69 and Mg (NO) 3 ) 2 ·6H 2 O, or a composite phase change material.
The single inorganic hydrous salt phase-change material adopted in the prior art has general supercooling and phase separation phenomena, and the composite phase-change material can realize the phase-change temperature regulation of 60-70 ℃ by regulating the proportion of all components and has larger phase-change latent heat, thermal stability and fusion degree.
The composite phase change material of the embodiment of the invention is not limited to the composite phase change material, and any other composite phase change material similar to the composite phase change material is within the protection scope of the embodiment of the invention.
Based on the liquid phosphorus supply system, the phase change material also comprises 5-30% of fatty acid.
Further, the fatty acid is selected from one or more of stearic acid, capric acid, lauric acid or palmitic acid. Based on the combination, the composite material with the phase change temperature of 62-68 ℃ can be obtained, and has large latent heat of phase change and good heat conduction performance.
In practical application, the stearic acid selected above can also be other fatty acids. The composite phase change material of the embodiment of the present invention is not limited to the stearic acid, and any other fatty acid having similar properties to stearic acid is within the scope of the embodiment of the present invention.
Although a great deal of systematic research on phase change materials is carried out by relevant scholars at home and abroad in recent years, some phase change materials are commercialized, but the problems of heat storage performance, durability and the like still exist. For example, after the phase-change material is subjected to multiple cold and hot cycles, the mixture is supercooled and phase-separated, so that the heat storage performance of the material is reduced, and therefore, the development of the phase-change material with stable performance and large phase-change latent heat is of great significance. The single inorganic hydrated salt phase-change material adopted in the prior art has general supercooling and phase separation phenomena, the single organic phase-change material has small phase-change latent heat, different phase-change materials are selected according to different phase-change temperatures, the complexity is high, and the used phase-change material is high in price.
According to the liquid phosphorus supply system, the fatty acid is one or more selected from stearic acid, capric acid, lauric acid or palmitic acid.
The liquid phosphorus supply system based on the invention further comprises a plurality of valves and temperature sensors, wherein each valve 7 is arranged between the heat preservation pipe and the steam main pipe 6, and a plurality of temperature sensors 9 are respectively arranged in the phosphorus melting tank 1 and the conveying pipeline 2.
But through the temperature reading on each temperature sensor in real time monitoring phosphorus melting groove and the pipeline, especially steam temperature in the insulating tube and the temperature in the steam main pipe all reduce when steam system breaks down, before the temperature in the insulating tube reaches the phase change material temperature, close the insulating tube with each valve between the steam main pipe, avoid the heat of insulating tube to transmit between the steam main pipe for the heat of phase change material layer release is used for the phosphorus heating in the conveyer pipe as far as possible, prevents that it from solidifying and blockking up the conveyer pipe, thereby causes equipment damage, occurence of failure or unable normal transport liquid phosphorus.
Specifically, the steam coil 5 is connected in series to the steam main pipe 6, each of the heat preservation pipes is connected in parallel to the steam main pipe 6 through a branch pipe, and each of the valves 7 is arranged on each of the branch pipes 8.
The liquid phosphorus supply system is characterized in that the conveying pipeline 2 comprises a plurality of conveying pipes which are sequentially arranged along the conveying direction of the liquid phosphorus, the heat preservation pipe comprises a plurality of sleeves, each conveying pipe is sleeved with one sleeve, the sleeves are communicated with one another, each sleeve is communicated with a steam main pipe 6, each sleeve and the steam main pipe are respectively provided with a plurality of electromagnetic valves, and each conveying pipe is provided with the heat preservation interlayer.
Between the discharge gate in molten phosphorus groove to the feed inlet of drawing liquid pump, all set up the conveyer pipe between the discharge gate of drawing liquid pump to the atomizer and between other necessary delivery points, and each conveyer pipe all need wrap up one deck phase change material layer on every side, thereby continuously provide temperature protection for the conveyer pipe, strive for the time for steam system overhauls, and communicate each other between each sleeve pipe, make the mutual transmission of part heat between each sleeve pipe, the temperature between each sleeve pipe tends to unanimity, make conveyer pipe and liquid phosphorus be heated evenly.
The liquid phosphorus supply system further comprises a control device, each valve 7 is an electromagnetic valve, and each temperature sensor 9, each electromagnetic valve and the electric heating device 8 are respectively and electrically connected with the control device; the temperature sensor in the phosphorus melting tank 1 monitors the temperature of liquid phosphorus in the phosphorus melting tank 1 and sends the temperature to the control device, and the temperature sensor in the conveying pipeline monitors the temperature of the liquid phosphorus in the conveying pipeline and sends the temperature to the control device; when the temperature in the phosphorus melting tank 1 is reduced to a preset first threshold value, the control device controls the electric heating device to be started and maintains the temperature in the phosphorus melting tank 1 above the first temperature, when the temperature in the conveying pipeline is reduced to the phase change temperature of the phase change material, the phase change material releases heat to supply heat for liquid phosphorus in the conveying pipe, and when the temperature in the conveying pipeline is reduced to a second threshold value, the control device controls the electric heating device to improve heating power and controls the temperature in the phosphorus melting tank to be maintained above the second temperature; the phase transition temperature is higher than the second threshold and lower than the second temperature, and the first temperature is higher than the first threshold and lower than the second temperature.
The temperature of liquid phosphorus in the phosphorus melting tank 1 is monitored by the temperature sensor in the phosphorus melting tank 1 and is sent to the control device, the temperature of the liquid phosphorus in the conveying pipeline is monitored by the temperature sensor in the conveying pipeline and is sent to the control device, and then heating and power control of the electric heating device are realized by the control device, so that the supply of the liquid phosphorus of a downstream production system and the stability of the temperature are guaranteed.
Preferably, the heating device comprises a plurality of heating plates, the heating plates are uniformly distributed in the phosphorus melting tank to ensure the uniformity of heating liquid phosphorus in the heating tank, and heating wires are respectively arranged in the heating plates.
The method for keeping the stable supply of the liquid phosphorus by using the liquid phosphorus supply system comprises the following specific steps: when a steam system fails and steam cannot be normally conveyed into the steam coil, the temperature in the phosphorus melting tank 1 and the temperature in the conveying pipeline 2 are gradually reduced, when the temperature in the phosphorus melting tank 1 is reduced to a first threshold temperature preset in a control device, the control device controls the electric heating device to be started, the temperature in the phosphorus melting tank 1 is controlled to be maintained at the first temperature, when the temperature in the conveying pipeline is reduced to the phase change temperature of the phase change material, the phase change material releases heat to supply heat for liquid phosphorus in the conveying pipeline, and when the temperature in the conveying pipeline is reduced to a second threshold temperature, the control device controls the electric heating device to improve heating power and controls the temperature in the phosphorus melting tank to be maintained at a second temperature; the phase transition temperature is above the second threshold temperature and below the second temperature; the first temperature is higher than the first threshold temperature and lower than the second temperature.
In a specific embodiment, in a normal state, the temperature of molten phosphorus in the molten phosphorus tank is as follows: 60-90 ℃, the phase change temperature of the phase change material is 68 ℃, and the temperature of the steam main pipe is controlled to ensure that the temperature of the liquid phosphorus in the liquid phosphorus conveying temperature conveying pipeline is 70 +/-5 ℃ for conveying. When the steam system has a fault, monitoring the temperature of liquid phosphorus in the phosphorus melting tank 1 through a temperature sensor in the phosphorus melting tank 1 and sending the temperature to a control device, and monitoring the temperature of the liquid phosphorus in the conveying pipeline through a temperature sensor in the conveying pipeline and sending the temperature to the control device; due to the failure of a steam system, when the temperature in the phosphorus melting tank 1 is reduced to 60 ℃ which is a preset first threshold value, the control device controls the electric heating device to be started and maintains the temperature in the phosphorus melting tank 1 to be higher than 70 ℃, when the temperature in the conveying pipeline is reduced to 68 ℃ which is the phase change temperature of the phase change material, the phase change material releases heat to supply heat for liquid phosphorus in the conveying pipeline, and when the temperature in the conveying pipeline is reduced to 67 ℃ which is a second threshold value, the control device controls the electric heating device to improve the heating power and controls the temperature in the phosphorus melting tank to be maintained to be higher than 75 ℃ which is the second temperature, so that the temperature of the liquid phosphorus in the conveying pipeline is controlled to be 70 +/-5 ℃.
Based on the liquid phosphorus supply system, temperature protection can be continuously provided for the conveying pipeline when the steam system fails, the pipeline is prevented from being blocked by yellow phosphorus solidification, and time is won for overhauling the steam system; adopt electric heater unit for melting phosphorus groove heat supply, use phase change material to replace steam for the conveying line heat supply, can ensure the normal supply of liquid phosphorus in the short time after the trouble takes place, guarantee production efficiency, when the trouble duration is longer, improve electric heater unit's power, make electric heater unit for melting phosphorus groove and melt phosphorus pipeline and last the heat supply, and use phase change material to reduce the unsteady of liquid phosphorus temperature simultaneously, guarantee long-time interior liquid phosphorus normal supply.
The method for keeping the stable supply of liquid phosphorus comprises the following steps:
adding yellow phosphorus solid into a phosphorus melting tank 1 for melting, and continuously supplying heat to liquid phosphorus by using a steam coil 5;
starting a liquid pump 10 to convey liquid phosphorus to a downstream production system;
when steam system breaks down, can't be to steam coil 5 in the normal transport steam, open electric heater unit 8 and carry out the heat supply for the liquid phosphorus in the phosphorus melting groove 1, work as when the temperature in the pipeline 2 falls to phase change material's phase transition temperature, phase change material release heat supplies heat for the liquid phosphorus in the pipeline 2 to guarantee the continuous supply of liquid phosphorus, the stability of guarantee production, after steam system resumes normally, reuse steam supplies heat for phosphorus melting groove and pipeline.
According to the method for keeping stable supply of liquid phosphorus, before yellow phosphorus solid is added into the phosphorus melting tank to be melted for 1, water is firstly added into the phosphorus melting tank 1, then steam is introduced into the steam coil pipe 5, the steam coil pipe is enabled to heat the water in the phosphorus melting tank 1, and then the yellow phosphorus solid is added into the phosphorus melting tank 1.
Although embodiments of the present invention have been described in detail above, those of ordinary skill in the art will appreciate that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A liquid phosphorus supply system, comprising: the device comprises a phosphorus melting tank (1), a conveying pipeline (2), a heat preservation pipe (3) for conveying steam, a steam main pipe (6), a steam coil pipe (5), an electric heating device (8) and a liquid pump (10), wherein a discharge hole (11) of the phosphorus melting tank (1) is communicated with a feed inlet of the conveying pipeline, the conveying pipeline is sleeved with the heat preservation pipe, a heat preservation interlayer is arranged between the conveying pipeline and the heat preservation pipe, the heat preservation interlayer is fixed on the outer wall of the conveying pipeline, a phase change material is filled in the heat preservation interlayer (4), and the phase change temperature of the phase change material is between a phosphorus melting point and the temperature of water vapor; the steam coil (5) and the electric heating device (8) are respectively positioned in the phosphorus melting tank (1); the steam coil pipe (5) and the heat preservation pipe are respectively communicated with the steam main pipe (6); the liquid pump is arranged on the conveying line and used for pumping liquid phosphorus;
the liquid phosphorus supply system also comprises a plurality of valves and temperature sensors, each valve (7) is arranged between the heat-insulating pipe (3) and the steam main pipe (6), and a plurality of temperature sensors (9) are respectively arranged in the phosphorus melting tank (1) and the conveying pipeline (2);
the liquid phosphorus supply system also comprises a control device, each valve (7) is an electromagnetic valve, and each temperature sensor (9), each electromagnetic valve and the electric heating device (8) are respectively and electrically connected with the control device; the temperature sensor in the phosphorus melting tank (1) monitors the temperature of liquid phosphorus in the phosphorus melting tank (1) and sends the temperature to the control device, and the temperature sensor in the conveying pipeline monitors the temperature of the liquid phosphorus in the conveying pipeline and sends the temperature to the control device; when the temperature in the phosphorus melting tank (1) is reduced to a preset first threshold value, the control device controls the electric heating device to be started and maintain the temperature in the phosphorus melting tank (1) above the first temperature, when the temperature in the conveying pipeline is reduced to the phase change temperature of the phase change material, the phase change material releases heat to supply heat for liquid phosphorus in the conveying pipeline, and when the temperature in the conveying pipeline is reduced to a second threshold value, the control device controls the electric heating device to improve heating power and control the temperature in the phosphorus melting tank to be maintained above the second temperature; the phase transition temperature is higher than the second threshold and lower than the second temperature, and the first temperature is higher than the first threshold and lower than the second temperature.
2. The liquid phosphorus supply system of claim 1, wherein the phase change material has a phase change temperature of 50-90 ℃.
3. The liquid phosphorus supply system according to claim 1,characterized in that the phase change material is selected from Fe (NO) 3 ) 2 ·6H 2 O、Na 3 PO 4 ·12H 2 O、Na 2 P 2 O 7 ·10H 2 O、Mg(NO 3 ) 2 ·6H 2 O、MgCl 2 ·6H 2 O、Al(NO 3 ) 2 ·9H 2 O、Na 2 SO 4 ·10H 2 O or Na 2 HPO 4 ·12H 2 And O is any one or a combination of a plurality of O.
4. The liquid phosphorus supply system of claim 1, wherein the phase change material is Fe (NO) 3 ) 2 ·6H 2 O、Na 2 P 2 O 7 ·10H 2 O and Mg (NO) 3 ) 2 ·6H 2 O, or a composite phase change material.
5. The liquid phosphorus supply system of claim 1, wherein the phase change material further comprises 5% -30% fatty acids.
6. The liquid phosphorus supply system of claim 5, wherein the fatty acid is selected from one or more of stearic acid, capric acid, lauric acid or palmitic acid.
7. The liquid phosphorus supply system according to claim 1, wherein the delivery pipeline (2) comprises a plurality of delivery pipes arranged in sequence along the delivery direction of the liquid phosphorus, the heat preservation pipe comprises a plurality of sleeves, each delivery pipe is sleeved with one sleeve, the sleeves are communicated with each other, each sleeve is communicated with the main steam pipe (6), each sleeve and the main steam pipe are respectively provided with a plurality of electromagnetic valves, and each delivery pipe is provided with the heat preservation interlayer.
8. A method for maintaining a stable supply of liquid phosphorus, wherein a liquid phosphorus supply system according to any one of claims 1 to 7 is used to deliver liquid phosphorus to a downstream production system, comprising the steps of:
adding yellow phosphorus solid into a phosphorus melting tank (1) for melting, and continuously supplying heat to liquid phosphorus by using a steam coil (5);
starting a liquid pump (10) to convey liquid phosphorus to a downstream production system;
when the steam system fails and cannot normally convey steam into the steam coil (5), the electric heating device (8) is started to supply heat for liquid phosphorus in the phosphorus melting tank (1).
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| CN103615624A (en) * | 2013-11-30 | 2014-03-05 | 中国科学院电工研究所 | Fused salt pipeline heating device |
| CN109996987A (en) * | 2016-09-09 | 2019-07-09 | 恩文特服务有限责任公司 | Automatic re-melting control system |
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| CH436878A (en) * | 1966-03-18 | 1967-05-31 | Mancar Trust | Fire-proof glass fiber reinforced plastic pipe |
| CN202280996U (en) * | 2011-10-31 | 2012-06-20 | 张铭泰 | Device for conveying liquid yellow phosphorus with pipe |
| CN202803212U (en) * | 2012-09-15 | 2013-03-20 | 湖北三才堂化工科技有限公司 | Phosphorus melting tank |
| CN205933233U (en) * | 2016-05-27 | 2017-02-08 | 徐州贵能化工有限公司 | A phosphorus melting tank for phosphorus trichloride production line |
| CN105972339A (en) * | 2016-07-11 | 2016-09-28 | 江苏爱能森科技有限公司 | Preheating and solidification-preventing conveying pipeline structure |
| CN110234922A (en) * | 2017-01-30 | 2019-09-13 | 斯维兹波尔管理股份公司 | Method for keeping temperature of fluid medium |
| CN109354803A (en) * | 2018-10-23 | 2019-02-19 | 佛山科学技术学院 | A kind of anti-icing blocking package covers cladding material, casing and its manufacture craft |
| KR102095201B1 (en) * | 2019-06-25 | 2020-03-31 | 김영덕 | Fluid line heating jacket |
| CN111336347A (en) * | 2020-02-11 | 2020-06-26 | 西安交通大学 | Heat energy supply device for heat storage and insulation pipeline |
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| CN103615624A (en) * | 2013-11-30 | 2014-03-05 | 中国科学院电工研究所 | Fused salt pipeline heating device |
| CN109996987A (en) * | 2016-09-09 | 2019-07-09 | 恩文特服务有限责任公司 | Automatic re-melting control system |
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