A heat recovery glycol column reboiler

Abstract

The utility model relates to a kind of heat recovery's ethylene glycol tower reboiler, including reboiler body, reboiler body includes reboiler tank and the heat conduction ring fixed in reboiler tank inside;Heat insulator, the heat insulator includes protective cover and the heat energy utilization mechanism being set in protective cover, the heat energy utilization mechanism is used to utilize the heat emitted by heat conduction ring;Wherein, heat energy utilization mechanism includes storage tube and with the liquid inlet pipe of storage tube liquid inlet end communication, the liquid outlet pipe is communicated between the storage tube liquid outlet end and reboiler tank, and heat energy utilization mechanism is arranged on the surface of reboiler body, and the waste heat generated on the surface of reboiler tank is utilized, water in storage tube is heated, realizes the water in reboiler tank is heated and handled, heat energy utilization mechanism directly adheres to the surface of reboiler tank, and the heat exchange between water flow in storage tube and tank wall is used to preheat normal temperature inlet water to close process temperature, replace the heating mode of additional steam or electric energy consumption of conventional need.

Description

Technical Field

[0001] This utility model relates to the technical field of reboiler equipment, specifically to a heat recovery ethylene glycol tower reboiler. Background Technology

[0002] In the ethylene glycol production process, the reboiler of the distillation column is a key heat transfer device. Its core function is to heat the crude ethylene glycol solution at the bottom of the column with steam, providing the heat required for material vaporization and ensuring distillation separation efficiency. Most existing ethylene glycol column reboilers adopt a shell-and-tube structure. During operation, the internal heating medium temperature is usually maintained at 120-180℃. Heat will be conducted and radiated outward through the metal shell, resulting in surface heat loss.

[0003] During the operation of the reboiler, process water needs to be continuously replenished. In the existing process, room temperature water is often directly introduced, which requires additional steam or electricity to heat it to the temperature required by the process, further increasing the energy consumption of the equipment. There is a lack of heat recovery from the reboiler. Therefore, we need to provide a heat recovery ethylene glycol tower reboiler. Utility Model Content

[0004] The purpose of this invention is to provide a heat recovery ethylene glycol tower reboiler, which is equipped with a heat utilization mechanism on the surface of the reboiler body. The residual heat generated on the surface of the reboiler tank is utilized to heat the water in the storage tube, thereby heating the water entering the reboiler tank. The heat utilization mechanism is directly attached to the surface of the reboiler tank, and the room temperature inlet water is preheated to near the process temperature through heat exchange between the water flow in the storage tube and the tank wall. This solves the problem mentioned in the background art of lacking heat recovery from the reboiler.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a heat recovery ethylene glycol tower reboiler, comprising: The reboiler body includes a reboiler tank and a heat-conducting ring fixed inside the reboiler tank. A heat insulator, comprising a protective cover and a heat utilization mechanism disposed within the protective cover, the heat utilization mechanism being used to utilize the heat emitted by the heat-conducting ring; The thermal energy utilization mechanism includes a storage pipe and an inlet pipe connected to the inlet end of the storage pipe, and a drain pipe is connected between the outlet end of the storage pipe and the reboiler tank.

[0006] Preferably, the storage tube is configured as a heat-conducting tube, and the storage tube is spirally wound around the surface of the reboiler tank.

[0007] Preferably, a heat transfer cylinder is fixedly mounted on the surface of the heat-conducting ring, and the surface of the heat transfer cylinder is provided with a spiral groove for embedding the storage tube.

[0008] Preferably, it also includes a drain device, which includes a short tube, a long tube, and a control valve tube. The three lowest points at the bottom of the storage tube are connected to three short tubes, and the three short tubes are connected to each other through a long tube. The surface of the long tube is provided with two control valve tubes.

[0009] Preferably, a pressure relief valve is installed on the top of the protective cover, and the protective cover is configured as a heat insulation cover.

[0010] Preferably, both the inlet pipe and the outlet pipe are insulated pipes.

[0011] Preferably, thermally conductive silicone grease is provided between the heat transfer cylinder and the heat-conducting ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention features a heat utilization mechanism on the surface of the reboiler body. It utilizes the residual heat generated on the surface of the reboiler tank to heat the water in the storage tube, thereby heating the water entering the reboiler tank. The heat utilization mechanism is directly attached to the surface of the reboiler tank. Through heat exchange between the water flow in the storage tube and the tank wall, the ambient temperature incoming water is preheated to near the process temperature, replacing the traditional heating method that requires additional steam or electricity. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional rear view of the structure of this utility model; Figure 3 This is a perspective view of the heat preservation device of this utility model; Figure 4 This is a partial exploded perspective view of the structure of this utility model; Figure 5 This is a perspective view of the thermal energy utilization mechanism of this utility model.

[0014] In the diagram: 100, Reboiler body; 110, Reboiler tank; 120, Heat-conducting ring; 200, Insulator; 210, Protective cover; 220, Heat utilization mechanism; 221, Storage pipe; 222, Liquid inlet pipe; 223, Liquid outlet pipe; 3, Heat transfer cylinder; 4, Spiral groove; 5, Liquid drainer; 51, Short pipe; 52, Long pipe; 53, Control valve pipe; 6, Pressure relief valve gauge. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-5 This utility model provides a technical solution: a heat recovery ethylene glycol tower reboiler, comprising: The reboiler body 100 includes a reboiler tank 110 and a heat-conducting ring 120 fixed inside the reboiler tank 110. The heat preservation device 200 includes a protective cover 210 and a heat energy utilization mechanism 220 disposed inside the protective cover 210. The heat energy utilization mechanism 220 is used to utilize the heat emitted by the heat conducting ring 120. The heat energy utilization mechanism 220 includes a storage pipe 221 and an inlet pipe 222 connected to the inlet end of the storage pipe 221. A drain pipe 223 is connected between the outlet end of the storage pipe 221 and the reboiler tank 110. Specifically, a heat utilization mechanism 220 is provided on the surface of the reboiler body 100. It utilizes the waste heat generated on the surface of the reboiler tank 110 to heat the water in the storage tube 221, thereby heating the water entering the reboiler tank 110. The heat utilization mechanism 220 is directly attached to the surface of the reboiler tank 110. Through heat exchange between the water flow in the storage tube 221 and the tank wall, the ambient temperature water is preheated to near the process temperature, replacing the traditional heating method that requires additional steam or electricity. The recovery of surface waste heat does not require additional drive energy, reducing the energy consumption cost of preheating the water. On the other hand, after the preheated water enters the reboiler tank 110, it can reduce the heat load of the main heating system of the reboiler, indirectly reducing steam consumption.

[0017] The storage tube 221 is configured as a heat-conducting tube, and the storage tube 221 is spirally wound on the surface of the reboiler tank 110. Furthermore, the storage tube 221 is made of copper alloy heat-conducting tube. The liquid inlet end of the storage tube 221 is sealed to the liquid inlet pipe 222 through a flange, and the liquid outlet end is sealed to the liquid outlet pipe 223 through a flange. The spiral winding structure extends the residence time of the water flow in the tube 52 on the surface of the reboiler tank 110, thereby improving the waste heat absorption efficiency.

[0018] A heat transfer cylinder 3 is fixedly installed on the surface of the heat conduction ring 120, and a spiral groove 4 for embedding the storage tube 221 is opened on the surface of the heat transfer cylinder 3. It should be noted that the heat transfer cylinder 3 is made of cast aluminum. The inner ring of the heat transfer cylinder 3 is fixedly connected to the outer ring of the heat conduction ring 120 by welding. Thermal grease is filled between the inner ring of the heat transfer cylinder 3 and the outer ring of the heat conduction ring 120, filling the tiny gaps between them. The groove depth of the spiral groove 4 is adapted to the outer diameter of the storage tube 221. After the storage tube 221 is embedded in the groove, it is fixed by high-temperature resistant sealant, so that the storage tube 221 and the heat transfer cylinder 3 are in full contact. The heat of the heat conduction ring 120 is evenly conducted to the storage tube 221 through the heat transfer cylinder 3. At the same time, the thermal grease reduces the interface thermal resistance.

[0019] It also includes a drain device 5, which includes a short tube 51, a long tube 52 and a control valve tube 53. The three lowest points at the bottom of the storage tube 221 are connected to three short tubes 51, and the three short tubes 51 are connected to each other through the long tube 52. The surface of the long tube 52 is provided with two control valve tubes 53. It is worth noting that the short pipe 51 is welded to the bottom of the storage pipe 221, and the inner diameter of the short pipe 51 is smaller than that of the storage pipe 221. The other end of the three short pipes 51 is sealed to the long pipe 52. The control valve pipe 53 is either a ball valve or a gate valve. When water accumulates in the storage pipe 221 or maintenance is required, opening the control valve pipe 53 can quickly drain the liquid in the pipe, avoiding corrosion or freezing of the storage pipe 221 due to liquid retention, and improving the flexibility and safety of the drainage operation.

[0020] The protective cover 210 is equipped with a pressure relief valve gauge 6 on its top, and the protective cover 210 is configured as a heat insulation cover; Furthermore, the protective cover 210 uses rock wool or aluminum silicate wool as the insulation core material, and is wrapped with color steel plate or stainless steel plate on the outside. The pressure relief valve gauge 6 is installed at the preset opening on the top of the protective cover 210 through a threaded interface. The detection end of the pressure relief valve gauge 6 extends into the interior of the protective cover 210, and the exhaust end is connected to the outside atmosphere. The insulation core material can reduce the loss of residual heat from the protective cover 210 to the outside, and avoid secondary waste of heat energy. The pressure relief valve gauge 6 can monitor the air pressure generated by heat accumulation inside the protective cover 210 in real time. When the air pressure exceeds the safe value, it will automatically release pressure, which solves the problem of shell deformation or sealing failure caused by excessive air pressure inside the protective cover 210.

[0021] Both the inlet pipe 222 and the outlet pipe 223 are insulated pipes; Specifically, the outer layer of the inlet pipe 222 and the outlet pipe 223 is wrapped with a polyurethane insulation layer, and the inner layer is made of polyethylene or galvanized steel pipe. One end of the inlet pipe 222 is connected to the external water supply pipeline through a quick connector, and the other end is connected to the inlet end of the storage pipe 221. A solenoid valve controlled by a PLC controller is connected in series on the inlet pipe 222. One end of the outlet pipe 223 is connected to the outlet end of the storage pipe 221, and the other end extends to the feed port of the reboiler tank 110 and is fixed by a flange. The insulation layer can reduce the heat loss of the water after preheating in the pipe, ensuring that the water entering the reboiler tank 110 still maintains a high temperature. The solenoid valve works with the PLC controller to realize the automatic adjustment of the inlet volume.

[0022] Thermal grease is provided between the heat transfer cylinder 3 and the heat conduction ring 120; The thermal grease is made of high-temperature resistant organic silicon material. The thermal grease is applied evenly when the heat transfer cylinder 3 and the heat transfer ring 120 are assembled, with a thickness of 0.5-2mm. The thermal grease has good adhesion to the metal surfaces of the heat transfer cylinder 3 and the heat transfer ring 120, and does not melt or deteriorate within the operating temperature range of the reboiler tank 110.

[0023] The reboiler tank 110 and control valve tube 53 involved in this application are implemented using existing mature technologies and are connected to an external PLC controller and power supply. This is a conventional technical means in this field, so their specific circuit connections, control logic and working process will not be described in detail.

[0024] The reboiler tank 110 of this device generates heat during operation. A heat-conducting ring 120 is embedded within the reboiler tank 110 and is welded to it to absorb the heat. A protective cover 210, which serves as an insulation cover, is provided on the surface of the reboiler tank 110. The heat-conducting ring 120 extends the heat outwards, while the protective cover 210 traps the heat. A storage tube 221, spirally installed within the protective cover 210, extends the liquid's path and ensures sufficient heating. The storage tube 221 is made of a heat-conducting material and is installed within a spiral groove 4 on the surface of the heat transfer cylinder 3. The surface of the storage tube 221 has an increased contact area with the heat transfer cylinder 3, resulting in better heating. The inlet end of the liquid inlet pipe 222 is equipped with a water pump to transport the liquid. The heated liquid flows into the reboiler tank 110 through the drain pipe 223 for use. The drain pipe 223 is made of heat-insulating material to reduce heat loss. Three short pipes 51 are connected to the three lowest points at the bottom of the storage tube 221. The three short pipes 51 are connected to each other through a long pipe 52. The surface of the long pipe 52 is equipped with two control valve pipes 53, which can discharge the liquid in the storage tube. The top of the protective cover 210 is equipped with a pressure relief valve gauge 6 to balance the internal pressure of the protective cover 210.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat recovery ethylene glycol tower reboiler, characterized in that, include: The reboiler body (100) includes a reboiler tank (110) and a heat-conducting ring (120) fixed inside the reboiler tank (110). The heat insulator (200) includes a protective cover (210) and a heat utilization mechanism (220) disposed inside the protective cover (210), the heat utilization mechanism (220) being used to utilize the heat emitted by the heat-conducting ring (120); The thermal energy utilization mechanism (220) includes a storage pipe (221) and an inlet pipe (222) connected to the inlet end of the storage pipe (221). The outlet end of the storage pipe (221) is connected to the reboiler tank (110) by a drain pipe (223).

2. The reboiler for heat recovery of an ethylene glycol tower according to claim 1, characterized in that: The storage tube (221) is configured as a heat-conducting tube, and the storage tube (221) is spirally wound around the surface of the reboiler tank (110).

3. The reboiler for heat recovery ethylene glycol tower according to claim 2, characterized in that: A heat transfer cylinder (3) is fixedly installed on the surface of the heat-conducting ring (120), and a spiral groove (4) for embedding the storage tube (221) is provided on the surface of the heat transfer cylinder (3).

4. The reboiler for heat recovery ethylene glycol tower according to claim 2, characterized in that: It also includes a drain device (5), which includes a short tube (51), a long tube (52) and a control valve tube (53). The storage tube (221) has three short tubes (51) connected to its three lowest points. The three short tubes (51) are connected to each other through the long tube (52). The surface of the long tube (52) is provided with two control valve tubes (53).

5. The reboiler for heat recovery of an ethylene glycol tower according to claim 1, characterized in that: The protective cover (210) is equipped with a pressure relief valve (6) on its top, and the protective cover (210) is configured as a heat insulation cover.

6. The reboiler for heat recovery of an ethylene glycol tower according to claim 1, characterized in that: Both the inlet pipe (222) and the outlet pipe (223) are insulated pipes.

7. The reboiler for heat recovery ethylene glycol tower according to claim 3, characterized in that: Thermal grease is provided between the heat transfer cylinder (3) and the heat conduction ring (120).

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