CN108943651B - Heat exchange and heat preservation pipeline structure - Google Patents
Heat exchange and heat preservation pipeline structure Download PDFInfo
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- CN108943651B CN108943651B CN201810508820.XA CN201810508820A CN108943651B CN 108943651 B CN108943651 B CN 108943651B CN 201810508820 A CN201810508820 A CN 201810508820A CN 108943651 B CN108943651 B CN 108943651B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Abstract
The invention discloses a heat exchange and heat preservation pipeline structure which comprises a waste heat collection and heat preservation pipeline, a first cooling heat exchange pipeline, a second cooling heat exchange pipeline, a waste heat conveying and heat preservation pipeline and a return material and heat preservation pipeline; the waste heat collecting heat preservation pipeline is respectively connected with the first cooling heat exchange pipeline, the second cooling heat exchange pipeline and the waste heat conveying heat preservation pipeline in series, the first cooling heat exchange pipeline and the second cooling heat exchange pipeline are connected in parallel and then connected with the waste heat conveying heat preservation pipeline in parallel, and then connected with the feed back heat preservation pipeline in series through the centrifugal separation device. The invention has the advantages of fully utilizing the waste heat generated in the factory production, gradually cooling the pipe by using the waste heat and improving the strength of the pipe.
Description
Technical Field
The invention relates to the technical field of pipes, in particular to a heat exchange and insulation pipeline structure.
Background
The prior art plastic pipe processing process generally comprises the following steps: mixing, extrusion molding, cooling, drawing, cutting and the like. Wherein the mixing is to mix the resin with other auxiliary agents; the extrusion molding is to melt and extrude the mixed materials through an extruder; the drawing is to continuously and automatically draw the pipe which is cooled and hardened out from the machine head by the formed pipe body, and the finished product is obtained by variable frequency speed regulation and cutting.
At present, air cooling or water cooling is mostly adopted for cooling. The air cooling is to blow air to the surface of the tube body under the action of an air blower, so that the exchange rate of air around the tube body is increased, and the cooling efficiency is improved. Because the air quantity acted on the surface of the pipe body by the blower is difficult to ensure the uniformity, the pipe body is not uniformly cooled, and the phenomenon of strong and weak joints of the pipe body is easy to occur. And the traditional water cooling mode is adopted for carrying out limit cooling, so that the cooling rate of the pipe body is too high, the stress of the pipe body is concentrated, and the brittleness is larger.
A large amount of reaction residues can remain in the fine chemical engineering resin raw material processing process, a large amount of waste heat is often stored in the substances, and the waste of the part of waste heat can be caused by the traditional recovery and purification processes.
For example, patent application 201310384232.7 discloses a distillation process for synthetic resin production, which comprises distilling the water-washed synthetic resin mixture in a distillation still, condensing the distilled organic solvent and water in a cooling condenser, and separating the organic solvent into layers in a phase separator to recover the organic solvent. It can be seen that the waste heat associated with the distilled material is directly exchanged in the condenser and is not fully utilized.
For another example, in the preparation method of the phenolic resin disclosed in patent application 201010568431.X, the technical scheme of the preparation method includes that the reaction product is heated and distilled to dehydrate, and it can be seen that moisture in the reaction system is separated from the system after being evaporated into a gaseous state. It is known that the process of moisture gasification is an endothermic reaction, with the heat in the steam being relatively large, and this patent does not provide a solution to this part of the waste heat utilization.
Referring to the waste gas and waste water treatment mode of chemical plants in the prior art, the waste gas and waste water are generally recycled after being directly condensed and treated. According to the production system of the refined dimer acid, the mentioned high-temperature waste gas treatment device and the waste water treatment system disclosed in the patent application 201510362369.1, the structure of the device can be known that the high-temperature waste gas and waste water generated in the production system are directly subjected to condensation separation treatment, and the stored waste heat is not effectively utilized.
How to apply the above-mentioned production waste heat to the pipe cooling treatment has important practical significance in the research of the technology of realizing uniform and gradual cooling.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the heat exchange and heat preservation pipeline structure which makes full use of the waste heat produced in a factory, gradually cools the pipe by using the waste heat and improves the strength of the pipe.
The invention solves the technical problems through the following technical means: a heat exchange and heat preservation pipeline structure comprises a waste heat collection and heat preservation pipeline, a first cooling and heat exchange pipeline, a second cooling and heat exchange pipeline, a waste heat conveying and heat preservation pipeline and a feed back and heat preservation pipeline; the waste heat collecting heat-insulating pipeline is respectively connected with the first cooling heat exchange pipeline, the second cooling heat exchange pipeline and the waste heat conveying heat-insulating pipeline in series, and the first cooling heat exchange pipeline and the second cooling heat exchange pipeline are connected in parallel, then connected with the waste heat conveying heat-insulating pipeline in parallel and then connected with the feed back heat-insulating pipeline in series through a centrifugal separation device;
the first cooling heat exchange pipeline is arranged in a first water-cooling tank body assembly, the first water-cooling tank body assembly comprises a plurality of first water-cooling tank bodies, and the first cooling heat exchange pipeline is sequentially arranged from front to back according to a cooling sequence; the number of the first cooling heat exchange pipelines is multiple and the first cooling heat exchange pipelines are connected in parallel, and each first cooling heat exchange pipeline extends from the starting end of the first water cooling tank body at the starting position to the tail end of the first water cooling tank body at the ending position;
the second cooling heat exchange pipeline is arranged in a second water-cooling tank body assembly, the second water-cooling tank body assembly comprises a plurality of second water-cooling tank bodies, and the second water-cooling tank bodies are sequentially arranged from front to back according to a cooling sequence; the number of the second cooling heat exchange pipelines is a plurality of and the second cooling heat exchange pipelines are connected in parallel, and each second cooling heat exchange pipeline extends from the starting end of the second water cooling tank body located at the starting position to the tail end of the second water cooling tank body located at the ending position.
Preferably, the heat exchange and heat preservation pipeline structure further comprises a third cooling heat exchange pipeline, and the first cooling heat exchange pipeline and the second cooling heat exchange pipeline are connected in parallel, then connected in series with the third cooling heat exchange pipeline, and then connected in parallel with the waste heat conveying and heat preservation pipeline;
the third heat exchange pipeline is arranged in a third water-cooling tank body assembly, the third water-cooling tank body assembly comprises a plurality of third water-cooling tank bodies, and the third water-cooling tank bodies are sequentially arranged from front to back according to a cooling sequence; the number of the third cooling heat exchange pipelines is a plurality of and the third cooling heat exchange pipelines are connected in parallel, and each third cooling heat exchange pipeline extends from the starting end of the third water cooling tank body positioned at the starting position to the tail end of the third water cooling tank body positioned at the ending position.
Preferably, the openings of all the water cooling tank bodies are upward, and corresponding cooling heat exchange pipelines are arranged on the inner walls and the bottom walls of two sides of each water cooling tank body.
Preferably, the bottom of each group of water-cooling tank body assembly is provided with a water collecting tank, and the water collecting tank is communicated with the corresponding water-cooling tank body or extends to the upper part of the opening of the corresponding water-cooling tank body through a pipeline.
Preferably, pumps and valves are provided on all the pipes.
Preferably, a liquid level sensor and a temperature sensor are arranged on the inner side wall of each water-cooling tank body; the pump is a servo pump, and the valve is an electromagnetic valve.
Preferably, the heat supply source of the waste heat collecting and heat insulating pipeline is a distillation kettle, and the waste heat conveying and heat insulating pipeline is surrounded on the reaction kettle; and the material returned by the feed back heat insulation pipeline is used for the reaction kettle.
Preferably, all the heat-insulating pipelines have the same structure and are formed by connecting one or more heat-insulating pipe materials in sequence; the heat-insulation pipe comprises a pipe body, wherein the pipe body comprises an inner pipe body and an outer pipe body, and a gap layer is formed between the inner pipe body and the outer pipe body;
a framework is arranged in the gap layer, and two ends of the framework are respectively connected with the inner-layer pipe body and the outer-layer pipe body; the skeletons are wound at intervals by taking the central axis of the pipe body as the center, an accommodating through cavity is formed between every two adjacent skeletons and between the inner-layer pipe body and the outer-layer pipe body, and heat insulation foam materials are filled in the accommodating through cavity;
the heat insulation foam material comprises the following raw materials in parts by mass: 20-30 parts of polyvinyl chloride, 2-4 parts of polyacrylate emulsion, 0.5-0.8 part of maleic acid-acrylic acid copolymer sodium salt, 2-3 parts of coral tree powder, 1-2 parts of schima superba powder, 0.5-2 parts of aramid short fiber sheet, 1-2 parts of polyimide short fiber sheet, 0.5-1 part of azodicarbonamide, 0.5-1 part of tween, 0.3-0.6 part of alumina powder, 0.1-0.3 part of magnesium oxide powder and 0.2-0.5 part of silicon dioxide powder;
the pipe further comprises an end cover ring, and the end cover ring can cover the end part of the pipe body; the end cover ring is provided with a plurality of convex blocks, and the periphery of each convex block is coated with a rubber layer; the protruding block with hold logical chamber one-to-one, just protruding block can with hold logical chamber interference fit.
Preferably, a groove is formed in the inner wall of the accommodating through cavity, the groove extends to the opening of the accommodating through cavity from a position close to the opening of the accommodating through cavity, and a protruding structure matched with the groove is arranged on the outer surface of the rubber layer.
Preferably, all the cooling heat exchange pipelines are made of copper pipes or stainless steel pipes.
The invention has the advantages that: according to the invention, the first pipe after being extruded sequentially passes through the first cooling tank, the second cooling tank and the third cooling tank, the temperature of the first pipe is gradually reduced due to the gradual reduction of the temperature of the first cooling tank, the second cooling tank and the third cooling tank, and similarly, the temperature of the second pipe is also gradually reduced due to the sequential passing of the second pipe sequentially through the fourth cooling tank and the fifth cooling tank.
Compared with the air cooling technology in the prior art, the tube is always immersed in the heat exchange medium, so that the phenomenon of uneven heat exchange is avoided.
Compared with the water cooling in the prior art, the cooling of the invention adopts a gradually-reduced temperature cooling mode and then carries out the cold water cooling in the prior art, thereby avoiding the phenomenon of stress concentration caused by sudden change of the pipe body. The heat of each cooling tank is derived from the waste heat in the high-temperature steam distilled by the distillation still, the part of the waste heat is effectively utilized, the energy consumption is saved, and the effects of energy conservation and environmental protection are achieved.
Part of the waste heat of the invention can also be used for the effect of heat preservation of the reaction kettle. In actual production, the number of reaction kettles in a factory is large, and the waste heat energy of the invention supplies heat for a plurality of reaction kettles.
After the heat exchange medium is acted by the centrifugal separation device, the heat exchange medium can be partially recycled, so that the energy consumption is further saved.
According to the invention, the number of the first cooling heat exchange pipelines and the number of the second cooling heat exchange pipelines are multiple, so that the number of high-temperature steam flowing into the first cooling heat exchange pipelines and the second cooling heat exchange pipelines can be selected according to actual cooling requirements, and the temperature of each water cooling tank body can be controlled through the shunting effect.
Drawings
Fig. 1 is a structural flow chart of a heat exchange and insulation pipeline structure for processing a plastic pipe in embodiment 1 of the present invention.
Fig. 2 is a structural flow chart of a heat exchange and insulation pipeline structure for processing a plastic pipe in embodiment 2 of the present invention.
Fig. 3 is a schematic structural view of a second water-cooling tank assembly according to the present invention.
Fig. 4 is a partial enlarged view of fig. 3 of the present invention.
FIG. 5 is a schematic structural view of the heat-insulating pipe processed according to the present invention.
FIG. 6 is a schematic structural view of a pipe body in the heat-insulating pipe according to the present invention.
FIG. 7 is a schematic view of an end face structure of a pipe body in the heat insulation pipe of the present invention.
FIG. 8 is a schematic structural view of an end cap ring in the process of processing the heat insulation pipe material.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Example 1
As shown in fig. 1, the embodiment discloses a heat exchange and heat preservation pipeline structure for processing plastic pipes, which comprises a waste heat collection and heat preservation pipeline, a first cooling heat exchange pipeline, a second cooling heat exchange pipeline, a waste heat conveying and heat preservation pipeline, a feed back and heat preservation pipeline, a reaction kettle, a first water-cooling tank body assembly, a second water-cooling tank body assembly, a centrifugal separation device and a distillation kettle.
The first water-cooling tank body component comprises a plurality of first water-cooling tank bodies, and the second water-cooling tank body component comprises a plurality of second water-cooling tank bodies.
The feed end of the waste heat collecting and heat insulating pipeline is communicated with a steam outlet of the distillation kettle, and the discharge end of the waste heat collecting and heat insulating pipeline is divided into three branches. The first branch is connected with the plurality of first cooling heat exchange pipelines respectively, and each first cooling heat exchange pipeline extends from the starting end of the first water cooling tank body located at the starting position to the tail end of the first water cooling tank body located at the ending position. The number of the first water cooling tank bodies is three, and the first cooling tank, the second cooling tank and the third cooling tank are sequentially arranged from the starting end to the tail end.
The second branch is connected to a plurality of second cooling heat exchanging pipes, as shown in fig. 3, each second cooling heat exchanging pipe 1001 extends from the start end of the second water-cooling tank body located at the start position to the end of the second water-cooling tank body located at the end position. The number of the second water cooling tank bodies in this embodiment is two, and the fourth cooling tank 1002 and the fifth cooling tank 1003 are arranged in sequence from the start end to the end.
The first water-cooling tank body assembly and the third water-cooling tank body assembly described below refer to the structure of the second water-cooling tank body assembly described above. And a guide roller is arranged in each cooling groove and is used for supporting the pipe body and providing guidance for conveying the pipe body.
The pipeline of the third branch is connected with the feed inlet of the waste heat conveying heat-insulating pipeline, and the waste heat conveying heat-insulating pipeline is wound on the reaction kettle.
The first cooling heat exchange pipeline and the second cooling heat exchange pipeline of the invention are respectively connected in parallel after penetrating out of the third cooling tank and the fifth cooling tank, then connected in parallel with the discharge port of the waste heat conveying heat preservation pipeline and then communicated with the feed port of the centrifugal separation device, and the discharge port of the centrifugal separation device can be communicated with the reaction kettle through the feed back heat preservation pipeline.
According to the invention, a part of high-temperature steam distilled from the distillation still is conveyed to the first cooling heat exchange pipeline, the high-temperature steam exchanges heat with water in the first cooling tank, the second cooling tank and the third cooling tank in sequence, so that the water temperatures of the first cooling tank, the second cooling tank and the third cooling tank are improved, and the temperatures of the first cooling tank, the second cooling tank and the third cooling tank are decreased gradually due to the fact that the heat exchange amount of the first cooling tank, the second cooling tank and the third cooling tank is decreased gradually.
In a similar way, a part of the high-temperature steam is conveyed to the second cooling heat exchange pipeline, and the high-temperature steam exchanges heat with the water in the fourth cooling tank and the water in the fifth cooling tank in sequence, so that the water temperatures of the fourth cooling tank and the fifth cooling tank are improved. Similarly, the heat exchange amount of the fourth cooling tank and the fifth cooling tank is gradually reduced, so that the temperature of the fourth cooling tank and the temperature of the fifth cooling tank are gradually reduced.
And a part of the high-temperature steam is conveyed to the waste heat conveying heat-insulating pipeline to insulate the temperature of the reaction kettle, the medium flowing out of a discharge port of the conveying heat-insulating pipeline, the medium in the first cooling heat-exchanging pipeline after penetrating out of the third cooling tank and the medium in the second cooling heat-exchanging pipeline after penetrating out of the fifth cooling tank are subjected to mixed heat exchange and then enter the centrifugal separation device to be subjected to light-weight phase separation, and the separated water is supplied to the reaction kettle again through a discharge port of the centrifugal separation device.
The first water-cooling tank body component and the second water-cooling tank body component are used for cooling plastic parts extruded by the extruder, such as a pipe body. The reactor and the still of the present invention may be used for processing a resin required for a pipe. The resin produced by the reaction kettle is mixed with other auxiliary materials after being distilled, and flows into the water cooling tank body assembly of the invention for cooling after being extruded by the extruder. Because the cooling characteristics of the pipe bodies made of different materials are different, different pipe bodies are cooled in different water-cooling tank body assemblies. In this embodiment, two types of pipe bodies, i.e., the first water-cooling tank assembly and the second water-cooling tank assembly, are cooled, and it is obvious to those skilled in the art that other two or more types of water-cooling tank assemblies can be selected according to the requirement of the type and quantity of the pipe bodies actually produced.
According to the invention, the temperature of the first pipe is gradually reduced due to the gradual reduction of the temperature of the first cooling tank, the second cooling tank and the third cooling tank, and similarly, the temperature of the second pipe is also gradually reduced due to the gradual reduction of the temperature of the second pipe through the fourth cooling tank and the fifth cooling tank.
Compared with the air cooling technology in the prior art, the tube is always immersed in the heat exchange medium, so that the phenomenon of uneven heat exchange is avoided; compared with the water cooling in the prior art, the cooling of the invention adopts a gradually-reduced temperature cooling mode and then carries out the cold water cooling in the prior art, thereby avoiding the phenomenon of stress concentration caused by sudden change of the pipe body.
The heat of each cooling tank is derived from the waste heat in the high-temperature steam distilled by the distillation still, the part of the waste heat is effectively utilized, the energy consumption is saved, and the effects of energy conservation and environmental protection are achieved. Part of the waste heat of the invention can also be used for the effect of heat preservation of the reaction kettle. In actual production, the number of reaction kettles in a factory is large, and the waste heat energy of the invention supplies heat for a plurality of reaction kettles.
In addition, the heat exchange medium can be partially recycled after being acted by the centrifugal separation device, so that the energy consumption is further saved.
According to the invention, the number of the first cooling heat exchange pipelines and the number of the second cooling heat exchange pipelines are multiple, so that the number of high-temperature steam flowing into the first cooling heat exchange pipelines and the second cooling heat exchange pipelines can be selected according to actual cooling requirements, and the temperature of each water cooling tank body can be controlled through the shunting effect.
The direction of the arrows in the figures of the invention is indicated as the flow direction of the medium in the pipe body.
Example 2
As shown in fig. 2, the present embodiment is different from the above embodiments in that: the heat exchange and heat preservation pipeline structure further comprises a third cooling heat exchange pipeline, and the first cooling heat exchange pipeline, the second cooling heat exchange pipeline and the waste heat conveying and heat preservation pipeline are connected in parallel and then connected in series with the third cooling heat exchange pipeline.
The third heat exchange pipeline is arranged in a third water-cooling tank body assembly, and the third water-cooling tank body assembly comprises a plurality of third water-cooling tank bodies which are sequentially arranged from front to back according to a cooling sequence. The number of the third cooling heat exchange pipelines is a plurality of and the third cooling heat exchange pipelines are connected in parallel, and each third cooling heat exchange pipeline extends from the starting end of the third water cooling tank body at the starting position to the tail end of the third water cooling tank body at the ending position. The third water-cooling tank body component is provided with a sixth cooling tank and a seventh cooling tank in sequence from the starting end to the tail end.
Because the temperature of the medium flowing out of the discharge port of the waste heat conveying heat-insulating pipeline is higher, after the medium is mixed with the medium flowing out of the first cooling heat exchange pipeline and the second cooling heat exchange pipeline, the waste heat of the medium is possibly higher, and the part of waste heat is applied to the cooling systems of other pipes again, so that the utilization rate of the waste heat is further improved. In order to improve the heat exchange efficiency, all cooling heat exchange pipelines are made of copper pipes or stainless steel pipes with high heat conductivity coefficients.
Example 3
As shown in fig. 3 to 4, the present embodiment is different from the above embodiments in that: the openings of all the water cooling tank bodies of the embodiment are upward, and corresponding cooling heat exchange pipelines are arranged on the inner walls and the bottom walls of two sides of each water cooling tank body. The front end and the rear end of each water-cooling tank body are respectively provided with a material guide port 1004 which is used for allowing the pipe to penetrate into and out of the tank body.
In some embodiments, a water collecting tank 1005 is disposed at the bottom of each group of water-cooled tank assemblies, and the water collecting tank 1005 is communicated with or extends to the upper part of the opening of the corresponding water-cooled tank body through a pipeline 1006. The contact part of each heat exchange pipeline and the corresponding groove body is sealed by a sealing element.
Because the pipe has a gap with the material guiding opening of the water cooling tank body in the flowing process, water in the tank body can gradually flow out of the material guiding opening, and the water level in the tank body is gradually reduced. In order to supply water to the tank body, the water level of the tank body is ensured. According to the invention, the bottom of each group of water-cooled tank body assembly is provided with the water collecting tank, the effluent water is collected in the water collecting tank, and the water in the water collecting tank is pumped into the tank body again through the pipeline for circulating water supply.
The invention can also be provided with a liquid level sensor and a temperature sensor on the inner side wall of each water-cooling tank body. And all the pipelines are provided with pumps and valves. The pump is preferably a servo pump and the valve is preferably a solenoid valve.
The invention monitors the temperature of each tank body in real time through the liquid level sensor, and reasonably shunts the waste heat by matching the action of the electromagnetic valve and the servo pump. The liquid sensor monitors the water level of the tank body, and when the water level of the tank body is lower than a set water level, the water in the water collecting tank is supplemented to the corresponding tank body through the action of the electromagnetic valve and the servo pump.
Example 4
The embodiment discloses a preparation method of a heat insulation foaming material, which comprises the following steps:
(1) stirring 2 parts of coral tree powder, 1 part of schima superba powder, 0.5 part of aramid short fiber sheet, 1 part of polyimide short fiber sheet, 0.3 part of alumina powder, 0.1 part of magnesia powder, 0.2 part of silicon dioxide powder, 0.5 part of maleic acid-acrylic acid copolymer sodium salt, 20 parts of polyvinyl chloride and 2 parts of polyacrylate emulsion for 30min at the temperature of 20 ℃ and the speed of 400 r/min;
(2) adding 0.5 part of azodicarbonamide and 0.5 part of tween into the mixture obtained in the step (1), pouring the mixture into a mold preheated to 40 ℃ after 10 seconds, and then placing the mold into an oven at 70 ℃ for foaming for 10 min.
Example 5
The embodiment discloses a preparation method of a heat insulation foaming material, which comprises the following steps:
(1) stirring 3 parts of coral tree powder, 2 parts of schima superba powder, 2 parts of aramid short fiber sheet, 2 parts of polyimide short fiber sheet, 0.6 part of alumina powder, 0.3 part of magnesia powder, 0.5 part of silica powder, 0.8 part of maleic acid-acrylic acid copolymer sodium salt, 30 parts of polyvinyl chloride and 4 parts of polyacrylate emulsion for 20min at the temperature of 35 ℃ and the speed of 600 r/min;
(2) and (3) adding 1 part of azodicarbonamide and 1 part of tween into the step (1), pouring the mixture into a mold preheated to 40 ℃ after 15 seconds, and then placing the mold into an oven at 70 ℃ for foaming for 10 min.
Example 6
The embodiment discloses a preparation method of a heat insulation foaming material, which comprises the following steps:
(1) stirring 2 parts of coral tree powder, 2 parts of schima superba powder, 1.5 parts of aramid short fiber sheet, 1.5 parts of polyimide short fiber sheet, 0.4 part of alumina powder, 0.2 part of magnesium oxide powder, 0.3 part of silicon dioxide powder, 0.6 part of maleic acid-acrylic acid copolymer sodium salt, 25 parts of polyvinyl chloride and 3 parts of polyacrylate emulsion for 20min at the temperature of 30 ℃ and the speed of 500 r/min;
(2) adding 0.7 part of azodicarbonamide and 0.7 part of tween into the mixture obtained in the step (1), pouring the mixture into a mold preheated to 40 ℃ after 13 seconds, and then placing the mold into an oven at 70 ℃ for foaming for 10 min.
Example 7
The embodiment discloses a preparation method of a heat insulation foaming material, which comprises the following steps:
(1) stirring 28 parts of polyvinyl chloride, 2 parts of coral tree powder, 1 part of schima superba powder, 1 part of aramid short fiber sheet, 1 part of polyimide short fiber sheet, 0.5 part of alumina powder, 0.2 part of magnesium oxide powder, 0.35 part of silicon dioxide powder, 0.65 part of maleic acid-acrylic acid copolymer sodium salt and 3 parts of polyacrylate emulsion for 20min at the temperature of 30 ℃ and at the speed of 450 r/min;
(2) and (3) adding 1 part of azodicarbonamide and 1 part of tween into the step (1), pouring the mixture into a mold preheated to 35 ℃ after 15 seconds, and then placing the mold into an oven at 65 ℃ for foaming for 15 min.
Example 8
The embodiment discloses a preparation method of a heat insulation foaming material, which comprises the following steps:
(1) stirring 23 parts of polyvinyl chloride, 3 parts of coral tree powder, 2 parts of schima superba powder, 1 part of aramid short fiber sheet, 2 parts of polyimide short fiber sheet, 0.5 part of alumina powder, 0.2 part of magnesium oxide powder, 0.35 part of silicon dioxide powder, 0.6 part of maleic acid-acrylic acid copolymer sodium salt and 4 parts of polyacrylate emulsion for 20min at the temperature of 28 ℃ and at the speed of 500 r/min;
(2) adding 0.8 part of azodicarbonamide and 0.8 part of tween to the mixture obtained in the step (1), pouring the mixture into a mold preheated to 45 ℃ after 15 seconds, and then placing the mold into an oven at 70 ℃ for foaming for 15 min.
Example 9
The embodiment discloses a preparation method of a heat insulation foaming material, which comprises the following steps:
(1) stirring 25 parts of polyvinyl chloride, 2 parts of coral tree powder, 2 parts of schima superba powder, 1.5 parts of aramid short fiber sheet, 1.5 parts of polyimide short fiber sheet, 0.6 part of maleic acid-acrylic acid copolymer sodium salt and 3 parts of polyacrylate emulsion for 20min at the temperature of 30 ℃ and the speed of 500 r/min;
(2) adding 0.7 part of azodicarbonamide and 0.7 part of Tween, pouring into a mold preheated to 40 ℃ after 13s, and then placing into an oven at 70 ℃ for foaming for 10 min.
Example 10
The embodiment discloses a preparation method of a heat insulation foaming material, which comprises the following steps:
(1) stirring 25 parts of polyvinyl chloride, 0.4 part of alumina powder, 0.2 part of magnesia powder, 0.3 part of silicon dioxide powder, 0.6 part of maleic acid-acrylic acid copolymer sodium salt and 3 parts of polyacrylate emulsion for 20min at the temperature of 30 ℃ and the speed of 500 r/min;
(2) adding 0.7 part of azodicarbonamide and 0.7 part of Tween, pouring into a mold preheated to 40 ℃ after 13s, and then placing into an oven at 70 ℃ for foaming for 10 min.
Example 11
(1) Stirring 25 parts of polyvinyl chloride and 3 parts of polyacrylate emulsion for 20min at the temperature of 30 ℃ and the speed of 500 r/min;
(2) adding 0.7 part of azodicarbonamide and 0.7 part of Tween, pouring into a mold preheated to 40 ℃ after 13s, and then placing into an oven at 70 ℃ for foaming for 10 min.
Example 12
The embodiment discloses a preparation method of a heat insulation foaming material, which comprises the following steps:
(1) stirring 25 parts of polyvinyl chloride, 0.2 part of alumina powder, 0.1 part of magnesia powder, 0.2 part of maleic acid-acrylic acid copolymer sodium salt and 3 parts of polyacrylate emulsion for 20min at the temperature of 30 ℃ and the speed of 500 r/min;
(2) adding 0.7 part of azodicarbonamide and 0.7 part of Tween, pouring into a mold preheated to 40 ℃ after 13s, and then placing into an oven at 70 ℃ for foaming for 10 min.
Example 13
The thermal insulation foaming materials prepared by the methods of the above embodiments are tested, the porosity is measured and calculated, and the results are shown in Table 1 by the Archimedes drainage method according to the GB/T2997-1982.
As is clear from Table 1, the total porosity of the thermal insulation foam produced by the production method of the present invention (examples 4 to 8) was 65% or more, and the closed porosity thereof was stabilized at 62% or more, and was as high as 64%. The total porosity and closed porosity of the foams of examples 9 to 11 were increased as compared with those of examples 4 to 8, and the reason for this was probably that the number of foaming steps was reduced because the presence of solid-phase powder such as oxide occupied the space and position of the system. However, the total porosity and closed porosity of the foam of example 12 were increased as compared with those of examples 9 to 11, and the viscosity of the system was reduced by adding a small amount of solid phase, which may cause the bubbles generated in the foaming step to be easily broken and overflowed.
Example 14
The thermal conductivity coefficient (W/m.K, normal temperature) and the flame retardant property of the thermal insulation foam material prepared by the method of each example are tested, and the results are shown in Table 2.
As is clear from Table 2, the thermal insulation foam produced by the production method of the present invention (examples 4 to 8) had a thermal conductivity of about 0.03 to 0.04W/m.K and an oxygen index of about 45. The foam of example 9, to which no insulating oxide was added, had a thermal conductivity of approximately 0.055W/m.K and an oxygen index of less than 45. The foam material of example 10, which was not added with natural flame-retardant plants and flame-retardant fibers, had a thermal conductivity of approximately 0.05W/m.K and an oxygen index of less than 45. Example 11, which was foamed only with the resin, had the highest thermal conductivity and the lowest oxygen index.
In conclusion, the invention foams polyvinyl chloride and acrylate together, uses polyacrylic acid to make up the deficiency of low melt strength of polyvinyl chloride, and in addition, because polyvinyl chloride contains halogen, adopts acrylate to partially replace polyvinyl chloride, can reduce potential safety hazard. The heat-insulating oxide, the natural flame-retardant plants and the flame-retardant heat-insulating short fibers are added to replace the chemical synthetic flame retardant in the prior art, particularly the phosphorus-containing flame retardant, so that the flame-retardant heat-insulating flame-retardant flame-. The staple fiber sheet of the present invention is a staple fiber cut into chips, and the length thereof is less than 1 mm. The heat-insulating foaming material provided by the invention is prepared by mixing the raw materials, utilizes the effects of the raw materials to supplement each other, and has the advantages that the closed porosity can reach 64%, the heat conductivity coefficient can be as low as 0.03W/m.K, and the oxygen index is higher than 45.
Example 15
As shown in fig. 5 to 6, the embodiment discloses a multilayer heat insulation pipe, which includes a pipe body 11, where the pipe body 11 includes an inner pipe body 11 and an outer pipe body 112, and a gap layer is formed between the inner pipe body 11 and the outer pipe body 112;
as shown in fig. 7, a skeleton 13 is provided in the gap layer, and both ends of the skeleton 13 are connected to the inner pipe 11 and the outer pipe 112, respectively; the skeletons 13 are wound at intervals by taking the central axis of the pipe body 11 as a center, an accommodating through cavity 14 is formed between every two adjacent skeletons 13 and the inner pipe body 11 and the outer pipe body 112, and heat insulation foam materials are filled in the accommodating through cavity 14;
the heat insulation foam material comprises the following raw materials in parts by mass: 20-30 parts of polyvinyl chloride, 5-10 parts of ethyl acrylate, 0.5-2 parts of ammonium persulfate, 0.5-0.8 part of maleic acid-acrylic acid copolymer sodium salt, 0.5-1 part of sodium dodecyl benzene sulfonate, 2-3 parts of coral tree powder, 1-2 parts of schima superba powder, 0.5-2 parts of aramid short fiber sheet, 1-2 parts of polyimide short fiber sheet, 0.5-1 part of azodicarbonamide, 0.5-1 part of tween, 0.3-0.6 part of aluminum oxide powder, 0.1-0.3 part of magnesium oxide powder and 0.2-0.5 part of silicon dioxide powder. Of course, the insulating foam of the present invention may also be prior art.
As shown in fig. 5 and 8, the tube further includes an end cap ring 15, and the end cap ring 15 can cover the end of the tube 11; the end cover ring 15 is provided with a plurality of convex blocks, and the periphery of each convex block is coated with a rubber layer 151; the protruding blocks correspond to the accommodating through cavities 14 one to one, and the protruding blocks can be in interference fit with the accommodating through cavities 14.
In the conventional foaming material, the foaming material is sprayed in the interlayer of the pipe body 11 by the spraying action of a foaming gun, so that the foaming material naturally expands in the interlayer to realize the filling action. The foaming material is in disorder expansion and expansion foaming in the interlayer, so that the filling uniformity of the foaming material in the interlayer is poor. The pipe can adopt a filling method to cut the foamed material into small blocks, the small blocks are filled between the inner layer pipe body 11 and the outer layer pipe body 112 to form the containing through cavity 14, the filling uniformity is controllable, the end part of the pipe body 11 is sealed in a stamping mode, the foamed material is ensured to be always remained in the containing through cavity 14, and the phenomenon that the interface adhesive force between the traditional foamed material and the pipe wall is low to cause falling off is avoided.
In some embodiments, a groove 141 is formed on an inner wall of the accommodating through cavity 14, the groove 141 extends from a position close to an opening of the accommodating through cavity 14 to the opening of the accommodating through cavity 14, and a protrusion structure 1511 adapted to the groove 141 is disposed on an outer surface of the rubber layer 151.
The matching of the groove 141 and the raised structure 1511 can increase the contact area between the accommodating through cavity 14 and the rubber layer 151, thereby improving the closeness of the capping of the end cap ring 15.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A heat exchange and heat preservation pipeline structure is characterized by comprising a waste heat collection and heat preservation pipeline, a first cooling heat exchange pipeline, a second cooling heat exchange pipeline, a waste heat conveying and heat preservation pipeline and a return material and heat preservation pipeline; the waste heat collecting heat-insulating pipeline is respectively communicated with the first cooling heat exchange pipeline, the second cooling heat exchange pipeline and the waste heat conveying heat-insulating pipeline, and the first cooling heat exchange pipeline and the second cooling heat exchange pipeline are connected in parallel, then connected in parallel with the waste heat conveying heat-insulating pipeline and then connected in series with the feed back heat-insulating pipeline through a centrifugal separation device; the first cooling heat exchange pipeline is arranged in a first water-cooling tank body assembly, the first water-cooling tank body assembly comprises a plurality of first water-cooling tank bodies, and the first cooling heat exchange pipeline is sequentially arranged from front to back according to a cooling sequence; the number of the first cooling heat exchange pipelines is multiple and the first cooling heat exchange pipelines are connected in parallel, and each first cooling heat exchange pipeline extends from the starting end of the first water cooling tank body at the starting position to the tail end of the first water cooling tank body at the ending position; the second cooling heat exchange pipeline is arranged in a second water-cooling tank body assembly, the second water-cooling tank body assembly comprises a plurality of second water-cooling tank bodies, and the second water-cooling tank bodies are sequentially arranged from front to back according to a cooling sequence; the number of the second cooling heat exchange pipelines is multiple and the second cooling heat exchange pipelines are connected in parallel, and each second cooling heat exchange pipeline extends from the starting end of the second water cooling tank body located at the starting position to the tail end of the second water cooling tank body located at the ending position.
2. The heat exchange and insulation pipeline structure according to claim 1, further comprising a third cooling heat exchange pipeline, wherein the first cooling heat exchange pipeline and the second cooling heat exchange pipeline are connected in parallel with the waste heat conveying and insulation pipeline and then connected in series with the third cooling heat exchange pipeline; the third cooling heat exchange pipeline is arranged in a third water-cooling tank body assembly, the third water-cooling tank body assembly comprises a plurality of third water-cooling tank bodies, and the third water-cooling tank bodies are sequentially arranged from front to back according to a cooling sequence; the number of the third cooling heat exchange pipelines is multiple and the third cooling heat exchange pipelines are connected in parallel, and each third cooling heat exchange pipeline extends from the starting end of the third water cooling tank body positioned at the starting position to the tail end of the third water cooling tank body positioned at the ending position.
3. The heat exchange and insulation pipeline structure according to claim 1 or 2, wherein the openings of all the water cooling tank bodies are upward, and corresponding cooling and heat exchange pipelines are arranged on the inner walls and the bottom walls of two sides of each water cooling tank body.
4. The heat exchange and insulation pipeline structure according to claim 1 or 2, wherein a water collection tank is arranged at the bottom of each group of water cooling tank body assemblies, and the water collection tank is respectively communicated with the corresponding water cooling tank body or extends to the upper part of the opening of the corresponding water cooling tank body through a pipeline.
5. The heat exchange and insulation pipeline structure according to claim 1 or 2, wherein a pump and a valve are provided on all the pipelines.
6. The heat exchange and insulation pipeline structure as claimed in claim 5, wherein a liquid level sensor and a temperature sensor are arranged on the inner side wall of each water-cooling tank body; the pump is a servo pump, and the valve is an electromagnetic valve.
7. The heat exchange and insulation pipeline structure according to claim 1 or 2, wherein the heat supply source of the waste heat collection and insulation pipeline is a distillation kettle, and the waste heat delivery and insulation pipeline is surrounded on the reaction kettle; and the material returned by the feed back heat insulation pipeline is used for the reaction kettle.
8. The heat exchange and insulation pipeline structure according to claim 1 or 2, wherein all insulation pipelines have the same structure and are formed by sequentially connecting one or more insulation pipes end to end; the heat-insulation pipe comprises a pipe body, wherein the pipe body comprises an inner pipe body and an outer pipe body, and a gap layer is formed between the inner pipe body and the outer pipe body; a framework is arranged in the gap layer, and two ends of the framework are respectively connected with the inner-layer pipe body and the outer-layer pipe body; the skeletons are wound at intervals by taking the central axis of the pipe body as the center, an accommodating through cavity is formed between every two adjacent skeletons and between the inner-layer pipe body and the outer-layer pipe body, and heat insulation foam materials are filled in the accommodating through cavity; the heat insulation foam material comprises the following raw materials in parts by mass: 20-30 parts of polyvinyl chloride, 5-10 parts of ethyl acrylate, 0.5-2 parts of ammonium persulfate, 0.5-0.8 part of maleic acid-acrylic acid copolymer sodium salt, 0.5-1 part of sodium dodecyl benzene sulfonate, 2-3 parts of coral tree powder, 1-2 parts of schima superba powder, 0.5-2 parts of aramid short fiber sheet, 1-2 parts of polyimide short fiber sheet, 0.5-1 part of azodicarbonamide, 0.5-1 part of tween, 0.3-0.6 part of alumina powder, 0.1-0.3 part of magnesium oxide powder and 0.2-0.5 part of silicon dioxide powder; the pipe further comprises an end cover ring, and the end cover ring can cover the end part of the pipe body; the end cover ring is provided with a plurality of convex blocks, and the periphery of each convex block is coated with a rubber layer; the protruding block with hold logical chamber one-to-one, just protruding block can with hold logical chamber interference fit.
9. The heat exchange and insulation pipeline structure according to claim 8, wherein a groove is formed in the inner wall of the accommodating through cavity, the groove extends from a position close to the opening of the accommodating through cavity, and a protruding structure matched with the groove is arranged on the outer surface of the rubber layer.
10. The heat exchange and insulation pipeline structure according to claim 1 or 2, wherein all the cooling heat exchange pipelines are made of copper pipes or stainless steel pipes.
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| CN108943651B true CN108943651B (en) | 2020-07-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3312338A1 (en) * | 1982-05-13 | 1983-11-17 | Veb Kombinat Textima, Ddr 9010 Karl-Marx-Stadt | Device for cooling film webs, in particular for plastics processing machines |
| CN200995472Y (en) * | 2007-01-30 | 2007-12-26 | 熊猫电子集团有限公司 | Cooling-water circulating system for sizing channel of extruder |
| CN206186324U (en) * | 2016-08-31 | 2017-05-24 | 和则宏（天津）新型建材有限公司 | High temperature waste heat recovery type tubular product cooling system that corrected tubular product position |
| CN206718431U (en) * | 2017-03-27 | 2017-12-08 | 重庆市翼艳翔建材有限公司 | A kind of building materials plastic tube production and processing bosh |
| CN206840672U (en) * | 2017-01-26 | 2018-01-05 | 长沙宝之暖保温材料有限公司 | It is a kind of can waste heat recovery extrusion molding cooling system |
-
2018
- 2018-05-24 CN CN201810508820.XA patent/CN108943651B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3312338A1 (en) * | 1982-05-13 | 1983-11-17 | Veb Kombinat Textima, Ddr 9010 Karl-Marx-Stadt | Device for cooling film webs, in particular for plastics processing machines |
| CN200995472Y (en) * | 2007-01-30 | 2007-12-26 | 熊猫电子集团有限公司 | Cooling-water circulating system for sizing channel of extruder |
| CN206186324U (en) * | 2016-08-31 | 2017-05-24 | 和则宏（天津）新型建材有限公司 | High temperature waste heat recovery type tubular product cooling system that corrected tubular product position |
| CN206840672U (en) * | 2017-01-26 | 2018-01-05 | 长沙宝之暖保温材料有限公司 | It is a kind of can waste heat recovery extrusion molding cooling system |
| CN206718431U (en) * | 2017-03-27 | 2017-12-08 | 重庆市翼艳翔建材有限公司 | A kind of building materials plastic tube production and processing bosh |
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