Device for comprehensively utilizing tetrahydrofuran raffinate
By designing a comprehensive utilization device for tetrahydrofuran residues, using a chain control mechanism and a thermal oil heater, safe evaporation and combustion of tetrahydrofuran residues are achieved, and the safety and reuse rate of hazardous waste residues in the prior art are solved, and the overall benefits are improved.
Patent Information
- Application Number
- CN202421692578.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In the prior art, there is a large amount of condensate in the treatment of tetrahydrofuran residue, which leads to the risk of backfire, fire, explosion, etc. of the heat medium furnace, and hazardous waste must be sent to dispose of regularly, resulting in a low reuse rate of hazardous waste residue.
A device for comprehensive utilization of tetrahydrofuran residue was designed, including a buffer tank, a conveying pump, a liquid inlet tube, an evaporator, an air outlet tube and a heat medium furnace. Through a chain control mechanism and a thermal oil heater, the safe evaporation and combustion of tetrahydrofuran residue was achieved.
Through this device, a large amount of condensate is avoided from being transported to the hot medium furnace, the risks of fire and explosion are reduced, the reuse rate of hazardous waste and residual liquid is improved, the regular hazardous waste disposal is avoided, and the overall benefits are improved.
Smart Images
Figure CN222930301U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hazardous waste recycling, in particular to a device for comprehensive utilization of tetrahydrofuran residual liquid. Background Art
[0002] During the production of PBAT / PBT / PBS / PBSA / PBST, a certain amount of esterification water will be generated, which mainly contains tetrahydrofuran, water, and miscellaneous alcohols. In the tetrahydrofuran recovery process, tetrahydrofuran in the esterification water is separated from other substances to obtain THF with a purity of more than 99.95%. The separation adopts a three-tower process of an atmospheric primary distillation tower, a pressurized rectification tower, and an atmospheric purification tower. Among them, the primary distillation tower is heated and evaporated by steam, and the gas phase is cooled and then enters the rectification tower. The rectification tower is pressurized and reboiled and evaporated. The THF extracted from the bottom of the tower enters the middle of the purification tower after heat exchange. The bottom of the purification tower is heated by steam. After separation in the purification tower, waste residual liquid will be generated at the bottom of the tower. The waste residual liquid is an azeotrope and is a high-boiling impurity. After being condensed by circulating water in a steam condenser, it is sent to an external product storage tank through a discharge pump and regularly sent to a unit with hazardous waste disposal qualifications for disposal. Summary of the Utility Model
[0003] In view of this, the utility model provides a device for comprehensive utilization of tetrahydrofuran residual liquid, and the main purpose is to improve the reuse rate of hazardous waste residual liquid and improve the comprehensive benefit.
[0004] To achieve the above purpose, the utility model mainly provides the following technical solutions:
[0005] The utility model provides a device for comprehensive utilization of tetrahydrofuran residual liquid, which includes: a buffer tank, a transfer pump, a liquid inlet pipe, an evaporator, an air outlet pipe, and a heat medium furnace connected in sequence;
[0006] Wherein, a first flow meter and a first regulating valve are installed on the liquid inlet pipe, a second flow meter and a second regulating valve are installed on the air outlet pipe, a first pressure sensor is installed on the shell of the evaporator, and the first flow meter, the first regulating valve, and the second flow meter constitute a first interlock control mechanism, and the first pressure sensor and the second regulating valve constitute a second interlock control mechanism.
[0007] The purpose of the utility model and the solution to its technical problems can be further realized by the following technical measures.
[0008] Optionally, it further includes a balance pipe and a third regulating valve. One end of the balance pipe is connected to the shell of the evaporator, and the other end is connected to the upper end of the buffer tank. The third regulating valve is installed on the balance pipe, and a second pressure sensor is installed on the upper end of the buffer tank. The first pressure sensor, the second pressure sensor, and the third regulating valve constitute a third interlock control mechanism.
[0009] Optionally, the evaporator adopts a heat-conducting oil heater, which is provided with a U-shaped heating pipe. A plurality of baffles are arranged in a staggered manner in the shell side of the heat-conducting oil heater for forming a baffle space in the shell side of the heat-conducting oil heater. The liquid inlet pipe and the gas outlet pipe are respectively connected to opposite ends of the baffle space.
[0010] Optionally, it further includes a liquid level sensor, which is installed on the shell of the evaporator. The liquid level sensor and the first regulating valve form a fourth interlocking control mechanism.
[0011] Optionally, a safety valve is installed at the upper end of the shell of the evaporator.
[0012] Optionally, the upper end of the shell of the evaporator is connected to one end of an emergency vent pipe, and the other end of the emergency vent pipe is connected to a flame arrester.
[0013] Optionally, the upper end of the shell of the evaporator is connected to a pressure gauge.
[0014] Optionally, the balance pipe is provided with a U-shaped pipe section, which is arranged between the third regulating valve and the other end of the balance pipe.
[0015] By means of the above technical solutions, the utility model has at least the following advantages:
[0016] The buffer tank is used to store the tetrahydrofuran residual liquid. The tetrahydrofuran residual liquid enters the evaporator through the transfer pump and the liquid inlet pipe in sequence. The residual liquid evaporates and gasifies in the evaporator, and the tetrahydrofuran residual gas then enters the heat medium furnace along the gas outlet pipe.
[0017] Through this device, a large amount of condensate is prevented from being transported to the heat medium furnace, backfire of the heat medium furnace is avoided, risks such as fire and explosion are avoided. At the same time, the combustion of the tetrahydrofuran residual liquid also avoids the need to regularly send it to a hazardous waste treatment unit for disposal, improves the recycling rate of the hazardous waste residual liquid, and improves the comprehensive benefits.
[0018] The first flowmeter, the first regulating valve and the second flowmeter are integrated into the DCS control system to form a first interlocking control mechanism for controlling the fluid flow in and out of the evaporator.
[0019] The first pressure sensor and the second regulating valve are integrated into the DCS control system to form a second interlocking control mechanism for stabilizing the gas phase pressure in the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic structural diagram of a device for comprehensive utilization of tetrahydrofuran residual liquid provided by an embodiment of the utility model;
[0021] Figure 2 It is a top view of the evaporator.
[0022] The reference numerals in the drawings of the specification include: buffer tank 1, transfer pump 2, evaporator 3, heat medium furnace 4, first flowmeter 5, first regulating valve 6, second flowmeter 7, second regulating valve 8, first pressure sensor 9, third regulating valve 10, second pressure sensor 11, baffle 12, liquid level sensor 13, safety valve 14, flame arrester 15, pressure gauge 16, U-shaped pipe section 17. Detailed Description of the Preferred Embodiments
[0023] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended utility model purpose, the following combines the drawings and preferred embodiments to detail the specific implementation manners, structures, features, and effects of the application according to the present invention. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.
[0024] The present invention will be further described in detail below with reference to the drawings and embodiments.
[0025] As Figure 1 shown, a device for comprehensive utilization of tetrahydrofuran residual liquid provided by an embodiment of the present invention includes: a buffer tank 1, a transfer pump 2, a liquid inlet pipe, an evaporator 3, an air outlet pipe, and a heat medium furnace 4 connected in sequence;
[0026] Wherein, the liquid inlet pipe is provided with a first flowmeter 5 and a first regulating valve 6, the air outlet pipe is provided with a second flowmeter 7 and a second regulating valve 8, the housing of the evaporator 3 is provided with a first pressure sensor 9, the first flowmeter 5, the first regulating valve 6, and the second flowmeter 7 constitute a first interlock control mechanism, and the first pressure sensor 9 and the second regulating valve 8 constitute a second interlock control mechanism.
[0027] The working process of a device for comprehensive utilization of tetrahydrofuran residual liquid is as follows:
[0028] The buffer tank 1 is used to store tetrahydrofuran residual liquid. The tetrahydrofuran residual liquid sequentially passes through the transfer pump 2 and the liquid inlet pipe and enters the evaporator 3. The residual liquid evaporates and gasifies in the evaporator 3, and the tetrahydrofuran residual gas then enters the heat medium furnace 4 along the air outlet pipe.
[0029] Through this device, a large amount of condensate is prevented from being transported to the heat medium furnace 4, backfire of the heat medium furnace 4 is avoided, and risks such as fire and explosion are avoided. At the same time, the combustion of tetrahydrofuran residual liquid also avoids the need to regularly send it to a hazardous waste treatment unit for disposal, improves the recycling rate of hazardous waste residual liquid, and improves the comprehensive benefits.
[0030] The first flowmeter 5, the first regulating valve 6, and the second flowmeter 7 are integrated into the DCS control system to form a first interlocking control mechanism for controlling the fluid flow into and out of the evaporator 3.
[0031] The first pressure sensor 9 and the second regulating valve 8 are integrated into the DCS control system to form a second interlocking control mechanism for stabilizing the gas phase pressure in the evaporator 3.
[0032] As Figure 1 shown, in the specific embodiment, a balance pipe and a third regulating valve 10 are further included. One end of the balance pipe is connected to the housing of the evaporator 3, and the other end is connected to the upper end of the buffer tank 1. The third regulating valve 10 is installed on the balance pipe. A second pressure sensor 11 is installed at the upper end of the buffer tank 1. The first pressure sensor 9, the second pressure sensor 11, and the third regulating valve 10 form a third interlocking control mechanism.
[0033] In this embodiment, specifically, the first pressure sensor 9, the second pressure sensor 11, and the third regulating valve 10 are integrated into the DCS control system to form a third interlocking control mechanism.
[0034] The central processor of the DCS control system obtains the electrical signal of the pressure difference between the buffer tank 1 and the evaporator 3 through the first pressure sensor 9 and the second pressure sensor 11. When the second regulating valve 8 is fully open and the pressure difference is still too large, the third regulating valve 10 is opened, and the air pressure in the evaporator 3 can be partially discharged to the buffer tank 1, while avoiding too large a pressure difference between the inlet and outlet of the transfer pump 2.
[0035] As Figure 1 and Figure 2 shown, in the specific embodiment, the evaporator 3 uses a heat-conducting oil heater. The heat-conducting oil heater is provided with U-shaped heating tubes. A plurality of baffles 12 are arranged in a staggered manner in the shell side of the heat-conducting oil heater for forming a baffle space in the shell side of the heat-conducting oil heater. The liquid inlet pipe and the gas outlet pipe are respectively connected to the opposite ends of the baffle space.
[0036] In this embodiment, specifically, the tetrahydrofuran residue liquid enters the baffle space, can stay in the evaporator 3 for a long time, fully receive the heat of the heat-conducting oil, and gasify to a large extent.
[0037] As Figure 1 shown, in the specific embodiment, a liquid level sensor 13 is further included. The liquid level sensor 13 is installed on the housing of the evaporator 3. The liquid level sensor 13 and the first regulating valve 6 form a fourth interlocking control mechanism.
[0038] In this embodiment, specifically, the liquid level sensor 13 detects the residual liquid level in the evaporator 3 and transmits an electrical signal to the central processor of the DCS control system. The central processor adjusts the opening degree of the first regulating valve 6 accordingly, thereby adjusting the residual liquid level in the evaporator 3.
[0039] As Figure 1 shown, in a specific embodiment, a safety valve 14 is installed at the upper end of the housing of the evaporator 3.
[0040] In this embodiment, specifically, when the air pressure in the evaporator 3 suddenly rises to the popping pressure of the safety valve 14, the safety valve 14 pops up, and the high-pressure gas in the evaporator 3 is discharged to avoid dangerous situations.
[0041] As Figure 1 shown, in a specific embodiment, one end of the emergency vent pipe is connected to the upper end of the housing of the evaporator 3, and the other end of the emergency vent pipe is connected to a flame arrester 15.
[0042] In this embodiment, specifically, the flame arrester 15 ensures safe discharge during emergency venting.
[0043] As Figure 1 shown, in a specific embodiment, the upper end of the housing of the evaporator 3 is connected to a pressure gauge 16.
[0044] In this embodiment, specifically, the operator can confirm whether the air pressure in the evaporator 3 is within the safe range by observing the reading of the on-site pressure gauge 16.
[0045] As Figure 1 shown, in a specific embodiment, the balance pipe is provided with a U-shaped pipe section 17, and the U-shaped pipe section 17 is arranged between the third regulating valve 10 and the other end of the balance pipe.
[0046] In this embodiment, specifically, liquid is retained in the U-shaped pipe section 17. When the gas pressure in the evaporator 3 is within the controllable range, the third regulating valve 10 is closed. If the valve core of the closed third regulating valve 10 leaks internally, after the evaporation gas in the evaporator 3 passes through the third regulating valve 10, the liquid in the U-shaped pipe section 17 can also play a role of liquid seal, hindering the gas from entering the buffer tank 1 to a certain extent and improving the controllability of the device.
[0047] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of them should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims
1. A device for comprehensive utilization of tetrahydrofuran residue, characterized in that: include: A buffer tank, a delivery pump, a liquid inlet pipe, an evaporator, an air outlet pipe and a heat medium furnace connected in sequence; Among them, the liquid inlet pipe is installed with a first flow meter and a first regulating valve, the air outlet pipe is installed with a second flow meter and a second regulating valve, the shell of the evaporator is installed with a first pressure sensor, the first flow meter, the first regulating valve and the second flow meter constitute a first interlocking control mechanism, and the first pressure sensor and the second regulating valve constitute a second interlocking control mechanism.
2. The device for comprehensive utilization of tetrahydrofuran residue according to claim 1, characterized in that: It also includes a balancing pipe and a third regulating valve, one end of the balancing pipe is connected to the shell of the evaporator, and the other end is connected to the upper end of the buffer tank, the third regulating valve is installed on the balancing pipe, and a second pressure sensor is installed on the upper end of the buffer tank, and the first pressure sensor, the second pressure sensor and the third regulating valve constitute a third interlocking control mechanism.
3. The device for comprehensive utilization of tetrahydrofuran residue according to claim 1, characterized in that: The evaporator adopts a thermal oil heater, which is equipped with a U-shaped heating tube. The shell side of the thermal oil heater is staggered with multiple baffles to form a baffle space in the shell side of the thermal oil heater. The liquid inlet pipe and the air outlet pipe are respectively connected to the opposite ends of the baffle space.
4. The device for comprehensive utilization of tetrahydrofuran residue according to claim 1, characterized in that: It also includes a liquid level sensor, which is installed on the shell of the evaporator. The liquid level sensor and the first regulating valve constitute a fourth interlocking control mechanism.
5. The device for comprehensive utilization of tetrahydrofuran residual liquid according to any one of claims 1 to 4, characterized in that: A safety valve is installed on the upper end of the shell of the evaporator.
6. The device for comprehensive utilization of tetrahydrofuran residual liquid according to any one of claims 1 to 4, characterized in that: The upper end of the shell of the evaporator is connected to one end of the emergency vent pipe, and the other end of the emergency vent pipe is connected to the flame arrester.
7. The device for comprehensive utilization of tetrahydrofuran residual liquid according to any one of claims 1 to 4, characterized in that: The upper end of the shell of the evaporator is connected to a pressure gauge.
8. The device for comprehensive utilization of tetrahydrofuran residue according to claim 2, characterized in that: The balancing pipe is provided with a U-shaped pipe section, and the U-shaped pipe section is arranged between the third regulating valve and the other end of the balancing pipe.