Waste heat utilization system in crude glycerine purification process

Abstract

The invention relates to the technical field of glycerol purification, in particular to a waste heat utilization system in a crude glycerol purification process, which comprises a distillation retort mechanism, the upper end of the distillation retort mechanism is provided with a funnel assembly for feeding, one side of the funnel assembly is provided with a primary recovery mechanism for recovering waste heat and pre-heating glycerol, and the other side of the funnel assembly is provided with a secondary recovery mechanism for pre-heating glycerol. A secondary recovery mechanism is arranged in the distillation retort mechanism, the primary recovery mechanism comprises a first square pipe and a second square pipe, a suction assembly is arranged above the first square pipe and the second square pipe, heat absorption round pipes are arranged between the air inlet end of the suction assembly and the first square pipe and between the air inlet end of the suction assembly and the second square pipe respectively, and the air outlet end of the suction assembly is communicated with an exhaust pipeline. By arranging the first-stage recovery mechanism, heat on the surfaces of the first-stage steam pipeline and the second-stage steam pipeline can be automatically collected through mutual cooperation of a first square pipe and a second square pipe, the situation that the pipelines are in a high-temperature state for a long time, and consequently air tightness is reduced can be prevented, and waste of thermal resources can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of glycerol purification, and in particular to a waste heat utilization system during the purification process of crude glycerol. Background Art

[0002] The purification of crude glycerol includes multiple steps such as pretreatment, acidification, separation, neutralization, decolorization, and distillation. Distillation is to remove volatile substances and solvent residues in glycerol. During the distillation process, glycerol vapor will be subjected to fractional condensation in a multi-component condenser connected in series. By controlling the temperature of the condenser, refined glycerol with the required purity can be obtained.

[0003] However, in the prior art, when people use distillation equipment to heat and cool glycerol fractionally, there is often a certain amount of heat on the surface of pipes and equipment. Obviously, this not only causes a certain waste of thermal resources, but also easily scalds the staff. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a waste heat utilization system during the purification process of crude glycerol, which solves the technical problem that people often cause waste of thermal resources during the distillation of crude glycerol in the prior art, and has the advantages of being able to effectively reduce the waste of thermal resources and prevent the staff from being scalded.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A waste heat utilization system during the purification process of crude glycerol, including a distillation tank mechanism. A funnel assembly for feeding is provided at the upper end of the distillation tank mechanism. A primary recovery mechanism for recovering waste heat and preheating glycerol is provided on one side of the funnel assembly. A secondary recovery mechanism is arranged inside the distillation tank mechanism. When using this system to distill and process glycerol, the primary recovery mechanism and the secondary recovery mechanism will automatically recover and utilize the heat on the surface of pipes and equipment, thereby avoiding waste of heat. The primary recovery mechanism includes a first square pipe and a second square pipe. A suction assembly is arranged above the first square pipe and the second square pipe. Heat-absorbing round pipes are respectively arranged between the intake end of the suction assembly and the first square pipe and the second square pipe. The outlet end of the suction assembly is communicated with an exhaust pipe. Heat-conducting round pipes are coaxially arranged inside both the first square pipe and the second square pipe. Intake through holes are opened at the lower ends of the first square pipe and the second square pipe. When the suction assembly is powered on and operates, it will extract the heat inside the first square pipe and the second square pipe through the heat-absorbing round pipes.

[0006] Preferably, the distillation tank mechanism is composed of a stainless-steel outer tank and a heating inner tank. At the upper end of the stainless-steel outer tank, there is a primary steam pipeline connected to the heating inner tank. The other end of the primary steam pipeline is provided with a first condenser. A secondary steam pipeline is provided on the first condenser, and the other end of the secondary steam pipeline is provided with a second condenser. During the process of heating glycerol in the heating inner tank, the glycerol vapor will first enter the first condenser through the primary steam pipeline, and then enter the second condenser through the secondary steam pipeline.

[0007] Preferably, the funnel assembly includes a glycerol feed pipe connected to the heating inner tank. A material control valve for adjusting the flow rate of glycerol is provided on the glycerol feed pipe. The upper end of the glycerol feed pipe is provided with a funnel body. After glycerol enters the funnel body, it will enter the interior of the heating inner tank through the glycerol feed pipe.

[0008] Preferably, an annular cavity is formed inside the side wall of the funnel body, and an exhaust round hole is opened at the upper end of the funnel body. The exhaust round hole is connected to the interior of the annular cavity.

[0009] Preferably, the exhaust pipeline is connected to the interior of the annular cavity. When the suction assembly operates, the heat inside the exhaust pipeline will enter the interior of the annular cavity and finally be discharged through the exhaust round hole.

[0010] Preferably, the first square pipe is coaxially sleeved outside the primary steam pipeline, and the second square pipe is coaxially sleeved outside the secondary steam pipeline. The heat-conducting round pipe is in contact with the surface of the steam pipeline. During the glycerol purification process, the heat on the surfaces of the primary steam pipeline and the secondary steam pipeline will enter the interiors of the first square pipe and the second square pipe through the heat-conducting round pipe.

[0011] Preferably, the secondary recovery mechanism includes a water storage cavity formed between the stainless-steel outer tank and the heating inner tank. An electric heater is provided at the lower end of the heating inner tank. The interior of the water storage cavity is filled with a coolant. During the heating and distillation process, the heat on the outer surface of the heating inner tank will be absorbed by the coolant.

[0012] Preferably, an inlet and outlet water pipeline is provided on the stainless-steel outer tank. After the distillation process is completed, the hot water can be discharged through the inlet and outlet water pipeline.

[0013] By means of the above technical solutions, the present invention provides a waste heat utilization system during the purification process of crude glycerol, which has at least the following beneficial effects: 1. By setting the primary recovery mechanism and using the mutual cooperation between the first square pipe and the second square pipe, the present invention can automatically collect the heat on the surfaces of the primary steam pipeline and the secondary steam pipeline, which can not only prevent the airtightness from decreasing due to the pipeline being in a high-temperature state for a long time, but also reduce the waste of thermal resources.

[0014] 2. By providing a primary recovery mechanism and using the cooperation between the exhaust pipe and the annular cavity, the present invention can automatically preheat the glycerol inside the funnel body using the recovered heat, which is helpful for the subsequent distillation process.

[0015] 3. By providing a distillation tank mechanism and using the cooperation between the primary steam pipe and the secondary steam pipe, the present invention can perform staged condensation on the glycerol vapor, thereby removing volatile substances and solvent residues in the glycerol, and effectively improving the purity of refined glycerol.

[0016] 4. By providing a funnel assembly and using the cooperation between the material control valve and the glycerol feed pipe, the present invention can pour all the glycerol into the inside of the funnel body at one time, and then perform batch feeding, without the need for workers to feed multiple times, which is convenient to use.

[0017] 5. By providing a secondary recovery mechanism and using the cooperation between the water storage cavity and the water inlet and outlet pipes, the present invention can automatically recover and utilize the waste heat on the surface of the heating inner tank during the heating and distillation process, which can not only reduce the surface temperature of the stainless steel outer tank to prevent scalding, but also prevent waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings: Figure 1 is a perspective view of the overall structure of the present invention; Figure 2 is a schematic structural diagram of the distillation tank mechanism in the present invention; Figure 3 is a schematic structural diagram of the primary recovery mechanism in the present invention; Figure 4 is a cross-sectional view of the first square pipe structure in the present invention; Figure 5 is a schematic structural diagram of the annular cavity in the present invention; Figure 6 is a schematic structural diagram of the funnel body in the present invention; Figure 7 is a schematic structural diagram of the secondary recovery mechanism in the present invention.

[0019] In the figure: 1. Distillation tank mechanism; 101. Stainless steel outer tank; 102. Primary steam pipe; 103. First condenser; 104. Secondary steam pipe; 105. Second condenser; 106. Heating inner tank; 2. Funnel assembly; 201. Funnel body; 202. Glycerol feed pipe; 203. Material control valve; 3. Primary recovery mechanism; 301. First square pipe; 302. Second square pipe; 303. Suction assembly; 304. Heat absorption round pipe; 305. Exhaust pipe; 306. Heat conduction round pipe; 307. Air inlet through hole; 308. Annular cavity; 309. Exhaust round hole; 4. Secondary recovery mechanism; 401. Water storage cavity; 402. Electric heater; 403. Coolant; 404. Water inlet and outlet pipe. Detailed implementation mode

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1

[0022] In the prior art, when people use distillation equipment to heat and cool glycerol in stages, the surfaces of pipes and equipment are often in a high-temperature state. Obviously, this not only causes a certain waste of thermal resources, but also easily scalds the staff. To solve this technical defect existing in the prior art, as Figure 1 and Figures 3 - 6 shown, this embodiment proposes a waste heat utilization system in the process of crude glycerol purification, which can automatically collect the heat on the surfaces of the primary steam pipe 102 and the secondary steam pipe 104. At the upper end of the distillation tank mechanism 1 of this system, there is a funnel assembly 2 for feeding. On one side of the funnel assembly 2, there is a primary recovery mechanism 3 for recovering waste heat and preheating glycerol. Inside the distillation tank mechanism 1, there is a secondary recovery mechanism 4. When using this system to distill and process glycerol, the primary recovery mechanism 3 and the secondary recovery mechanism 4 will automatically recover and utilize the heat on the surfaces of pipes and equipment, thereby avoiding waste of heat.

[0023] In order to automatically recover and utilize the waste heat on the pipeline, a primary recovery mechanism 3 is provided in this embodiment. Specifically, the primary recovery mechanism 3 includes a first square pipe 301 and a second square pipe 302. The first square pipe 301 is coaxially sleeved outside the primary steam pipeline 102, and the second square pipe 302 is coaxially sleeved outside the secondary steam pipeline 104. A suction assembly 303 is arranged above the first square pipe 301 and the second square pipe 302. Heat-absorbing circular pipes 304 are respectively arranged between the intake end of the suction assembly 303 and the first square pipe 301 and the second square pipe 302. The outlet end of the suction assembly 303 is communicated with an exhaust pipeline 305. Heat-conducting circular pipes 306 are coaxially arranged inside both the first square pipe 301 and the second square pipe 302, and the heat-conducting circular pipes 306 are in contact with the surface of the steam pipeline. During the glycerol purification process, the heat on the surfaces of the primary steam pipeline 102 and the secondary steam pipeline 104 will enter the interiors of the first square pipe 301 and the second square pipe 302 through the heat-conducting circular pipes 306. Intake through-holes 307 are opened at the lower ends of both the first square pipe 301 and the second square pipe 302. When the suction assembly 303 is energized and operates, it will extract the heat inside the first square pipe 301 and the second square pipe 302 through the heat-absorbing circular pipes 304. An annular cavity 308 is formed inside the side wall of the funnel body 201, and the exhaust pipeline 305 is connected to the interior of the annular cavity 308. When the suction assembly 303 operates, the heat inside the exhaust pipeline 305 will enter the interior of the annular cavity 308 and finally be discharged through the exhaust round holes 309. An exhaust round hole 309 is opened at the upper end of the funnel body 201, and the exhaust round hole 309 is connected to the interior of the annular cavity 308.

[0024] According to the above content, during the staged condensation process, the heat-conducting circular pipe 306 (made of a metal with excellent heat-conducting performance, such as copper) inside the first square pipe 301 will conduct the heat on the surface of the primary steam pipeline 102 to the interior of the first square pipe 301, and the heat-conducting circular pipe 306 inside the second square pipe 302 will conduct the heat on the surface of the secondary steam pipeline 104 to the interior of the second square pipe 302.

[0025] Next, this part of the heat will enter the interior of the exhaust pipeline 305 through the heat-absorbing circular pipe 304 under the action of the suction assembly 303. Subsequently, the heat inside the exhaust pipeline 305 will enter the interior of the annular cavity 308, and finally will be discharged outward through the exhaust round holes 309, thereby preheating the glycerol inside the funnel body 201.

[0026] In this embodiment, by setting up a primary heat recovery mechanism 3 and utilizing the mutual cooperation between the first square pipe 301 and the second square pipe 302, the heat on the surfaces of the primary steam pipe 102 and the secondary steam pipe 104 can be automatically collected. This can not only prevent the airtightness of the pipes from decreasing due to long-term exposure to high temperatures but also reduce the waste of thermal resources. Moreover, in this embodiment, by setting up the primary heat recovery mechanism 3 and utilizing the mutual cooperation between the exhaust pipe 305 and the annular cavity 308, the heat recovered can be used to automatically preheat the glycerol inside the funnel body 201, which is helpful for the subsequent distillation process.

[0027] Embodiment Two

[0028] In order to distill crude glycerol and remove volatile substances and solvent residues in the glycerol, on the basis of Embodiment One, as Figure 1 、 Figure 2 and Figure 7 shown, this embodiment sets up a distillation tank mechanism 1. Specifically, the distillation tank mechanism 1 is composed of a stainless-steel outer tank 101 and a heating inner tank 106. The upper end of the stainless-steel outer tank 101 is provided with a primary steam pipe 102 communicating with the heating inner tank 106. The other end of the primary steam pipe 102 is provided with a first condenser 103. A secondary steam pipe 104 is arranged on the first condenser 103. The other end of the secondary steam pipe 104 is provided with a second condenser 105. During the process of heating the glycerol in the heating inner tank 106, the glycerol vapor will first enter the first condenser 103 through the primary steam pipe 102, and then enter the second condenser 105 through the secondary steam pipe 104. The funnel assembly 2 includes a glycerol feed pipe 202 communicating with the heating inner tank 106. A material control valve 203 for adjusting the flow rate of glycerol is arranged on the glycerol feed pipe 202. The upper end of the glycerol feed pipe 202 is provided with a funnel body 201. After the glycerol enters the funnel body 201, it will enter the interior of the heating inner tank 106 through the glycerol feed pipe 202.

[0029] According to the above content, during the purification process of crude glycerol, the staff will put the glycerol into the interior of the funnel body 201. Subsequently, the glycerol will enter the interior of the heating inner tank 106 through the glycerol feed pipe 202.

[0030] Next, the electric heater 402 will rapidly heat the heating inner tank 106. The glycerol vapor generated during the heating process will first enter the interior of the first condenser 103 through the primary steam pipe 102, and then enter the interior of the second condenser 105 through the secondary steam pipe 104, thereby performing hierarchical condensation on the glycerol vapor to obtain refined glycerol.

[0031] In this embodiment, by setting up the distillation tank mechanism 1 and utilizing the mutual cooperation between the primary steam pipeline 102 and the secondary steam pipeline 104, the glycerol vapor can be subjected to staged condensation, thereby removing volatile substances and solvent residues in the glycerol, and effectively improving the purity of refined glycerol. Moreover, in this embodiment, by setting up the funnel assembly 2 and utilizing the mutual cooperation between the material control valve 203 and the glycerol feed pipe 202, the glycerol can be poured into the interior of the funnel body 201 all at once, and then fed in batches, eliminating the need for workers to feed materials multiple times, which is convenient to use.

[0032] Embodiment Three

[0033] In order to reduce the surface temperature of the stainless steel outer tank 101 and prevent scalding, on the basis of the above embodiment, as Figure 2 and Figure 7 shown, this embodiment sets up a secondary recovery mechanism 4. Specifically, the secondary recovery mechanism 4 includes a water storage cavity 401 opened between the stainless steel outer tank 101 and the heating inner tank 106. An electric heater 402 is provided at the lower end of the heating inner tank 106. A coolant 403 is contained inside the water storage cavity 401. During the heating and distillation process, the heat on the outer surface of the heating inner tank 106 will be absorbed by the coolant 403. An inlet and outlet water pipeline 404 is provided on the stainless steel outer tank 101. After the distillation process is completed, the hot water can be discharged through the inlet and outlet water pipeline 404.

[0034] According to the above content, before the glycerol distillation starts, the worker will first fill the interior of the water storage cavity 401 with water using the inlet and outlet water pipeline 404. Next, during the glycerol distillation process, the heat on the outer surface of the heating inner tank 106 will be absorbed by the coolant 403 inside the water storage cavity 401, effectively reducing the surface temperature of the stainless steel outer tank 101 and preventing scalding.

[0035] After the distillation process is completed, the worker will use the inlet and outlet water pipeline 404 to discharge the hot water inside the water storage cavity 401, and then use this hot water to rinse and clean the heating inner tank 106, thus realizing the recycling of resources.

[0036] In this embodiment, by setting up the secondary recovery mechanism 4 and utilizing the mutual cooperation between the water storage cavity 401 and the inlet and outlet water pipeline 404, the waste heat on the surface of the heating inner tank 106 can be automatically recycled during the heating and distillation process, which can not only reduce the surface temperature of the stainless steel outer tank 101 and prevent scalding, but also prevent waste of resources.

[0037] The control mode of the present invention is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming of those skilled in the art. The provision of power also belongs to the common knowledge in the art. And the present invention mainly aims to protect mechanical devices, so the control mode and circuit connection of the present invention will not be explained in detail.

[0038] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste heat utilization system in the process of crude glycerol purification, comprising a distillation tank mechanism (1), characterized in that: The upper end of the distillation tank mechanism (1) is provided with a funnel assembly (2) for feeding. One side of the funnel assembly (2) is provided with a primary recovery mechanism (3) for recovering waste heat and preheating glycerol. A secondary recovery mechanism (4) is arranged inside the distillation tank mechanism (1). The primary recovery mechanism (3) includes a first square pipe (301) and a second square pipe (302). A suction assembly (303) is arranged above the first square pipe (301) and the second square pipe (302). Heat-absorbing round pipes (304) are respectively arranged between the intake end of the suction assembly (303) and the first square pipe (301) and the second square pipe (302). The outlet end of the suction assembly (303) is communicated with an exhaust pipe (305). Heat-conducting round pipes (306) are coaxially arranged inside the first square pipe (301) and the second square pipe (302). Intake through holes (307) are opened at the lower ends of the first square pipe (301) and the second square pipe (302).

2. The waste heat utilization system in the process of crude glycerol purification according to claim 1, characterized in that: The distillation tank mechanism (1) is composed of a stainless steel outer tank (101) and a heating inner tank (106). The upper end of the stainless steel outer tank (101) is provided with a primary steam pipe (102) communicated with the heating inner tank (106). The other end of the primary steam pipe (102) is provided with a first condenser (103). A secondary steam pipe (104) is arranged on the first condenser (103). The other end of the secondary steam pipe (104) is provided with a second condenser (105).

3. The waste heat utilization system in the crude glycerol purification process according to claim 1, wherein: The funnel assembly (2) includes a glycerol feed pipe (202) communicated with the heating inner tank (106). A material control valve (203) for adjusting the flow rate of glycerol is arranged on the glycerol feed pipe (202). A funnel body (201) is arranged at the upper end of the glycerol feed pipe (202).

4. The waste heat utilization system in the crude glycerol purification process according to claim 3, characterized in that: An annular cavity (308) is opened inside the side wall of the funnel body (201). An exhaust round hole (309) is opened at the upper end of the funnel body (201).

5. A waste heat utilization system during the purification process of crude glycerol according to claim 1, characterized in that: The exhaust pipe (305) is communicated with the inside of the annular cavity (308).

6. The waste heat utilization system in the crude glycerol purification process according to claim 2, characterized in that: The first square pipe (301) is coaxially sleeved outside the primary steam pipe (102). The second square pipe (302) is coaxially sleeved outside the secondary steam pipe (104). The heat-conducting round pipe (306) is in contact with the surface of the steam pipe.

7. The waste heat utilization system in the crude glycerol purification process according to claim 2, wherein: The secondary recovery mechanism (4) includes a water storage cavity (401) opened between the stainless steel outer tank (101) and the heating inner tank (106). An electric heater (402) is arranged at the lower end of the heating inner tank (106). A coolant (403) is filled inside the water storage cavity (401).

8. The waste heat utilization system in the crude glycerol purification process according to claim 7, characterized in that: An inlet and outlet water pipe (404) is arranged on the stainless steel outer tank (101).

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