A heat recovery structure for a distillation tower

Abstract

The utility model relates to the technical field of distillation equipment, and discloses a heat energy recovery structure for a distillation tower, comprising a tower body, wherein a reboiler and a condenser are arranged on the tower body; heating water flows in the reboiler, and the reboiler is used to heat and reboil materials in the tower body, and cooling water flows in the condenser, and the condenser is used to condense steam in the tower body; a material preheater is also arranged on the input port of the tower body, and the material preheater is connected with the reboiler and the condenser, and the material preheater is used to preheat the material for distillation processing through the cooling water in the condenser and the heating water in the reboiler. The utility model has the beneficial effect of high energy utilization rate.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation equipment, in particular to a heat energy recovery structure for a distillation tower. Background Art

[0002] Methyl methacrylate (MMA) is an important organic chemical raw material and a homopolymer or copolymer monomer, which is widely used in household appliances, automobiles, construction, sanitary ware, instruments and meters, advertising and decoration and other industries. When producing MMA, ACH method, C4 method and C2 method are mainly used for production. In the production process of ACH (acetone cyanohydrin) and MMA, it is usually necessary to use a distillation tower for distillation processing, so that the light components (low boiling substances) in the liquid phase are transferred to the gas phase, and the heavy components (high boiling substances) in the gas phase are transferred to the liquid phase, so as to achieve the purpose of separation.

[0003] For example, the patent document with the publication number CN103961895A discloses a distillation tower, which includes a tower body, a packing layer, a condenser and a reboiling heater connected to the bottom of the tower body. The packing layer is arranged in the tower body, and is composed of a tower plate, an activated carbon layer plate and a zeolite packing layer arranged on the tower plate in sequence. The condenser is connected to the top of the tower body through a conduit and a reflux pipe. An opening is arranged on the tower body corresponding to the position of the activated carbon layer plate between the tower plate and the zeolite layer. A spray pipe connected to the reflux pipe is arranged inside the tower body, and the spray pipe is provided with downward spray holes. The opening on the tower body can easily extract the activated carbon layer plate and replace the activated carbon; a spray head is arranged inside the tower body, and the refluxed condensate can be sprayed in the tower body to ensure that the condensate falls evenly and improve the distillation effect.

[0004] Although the above technical scheme can realize the uniform descending of the condensate in the tower body and improve the distillation effect, during the distillation process, the steam at the top of the tower is cooled by the condenser and the material at the bottom of the tower is heated by the reboiler heater; during the distillation process, the cooling water in the condenser will be heated by the high-temperature steam to form high-temperature water, and the heating water in the reboiler heater will still have a large amount of heat remaining after reboiled heating of the material. The high-temperature water discharged from the condenser and the reboiler heater cannot be effectively utilized, resulting in heat energy loss. Utility Model Content

[0005] The utility model aims to provide a heat energy recovery structure for a distillation tower to solve the technical problem in the prior art that high-temperature water discharged from a condenser and a reboiler heater cannot be effectively utilized, resulting in heat energy loss.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a heat energy recovery structure for a distillation tower, comprising a tower body, on which a reboiler and a condenser are provided; heating water flows in the reboiler, and the reboiler is used to heat and reboil the material in the tower body, and cooling water flows in the condenser, and the condenser is used to condense the steam in the tower body; a material preheater is also provided on the input port of the tower body, and the material preheater is connected to the reboiler and the condenser, and the material preheater is used to preheat the material for distillation processing through the cooling water in the condenser and the heating water in the reboiler.

[0007] The principle and advantage of this scheme are: when the material is subjected to distillation processing, the material is preheated in the material preheater, and the preheated material is transported to the distillation chamber for distillation processing under the action of the reboiler and the condenser. During the distillation processing, the hot water after cooling or reboiled heating in the condenser and the reboiler is transported to the material preheater through a pipeline to heat the material. In this scheme, by connecting the material preheater with the condenser and the reboiler, the high-temperature cooling water after heat exchange with the high-temperature material in the condenser and the heating water that still contains a large amount of heat after heating the material in the reboiler are transported to the material preheater to preheat the material, so that the heat in the distillation process can be fully recycled and utilized, avoiding the ineffective utilization of heat in the condenser and the reboiler, resulting in energy waste.

[0008] Preferably, as an improvement, the reboiler is located at the bottom of the tower body, and a heating water inlet and a heating water outlet are provided on the reboiler. The heating water inlet is used to transport heating water into the reboiler to heat the material; the heating water outlet is used to discharge the heating water after heat exchange with the material.

[0009] Preferably, as an improvement, the material preheater is connected to the heating water outlet, so that the heating water can be used to reboil the material in the reboiler first, ensuring the heating effect of the reboiler on the material, and because the temperature of the material in the tower body is relatively high, the reboiler still has a relatively high temperature after heating the material, and the heating water used in the reboiler is transported to the material preheater for preheating, ensuring the preheating effect, improving the utilization rate of the heating water energy, and saving the energy consumption of the distillation process.

[0010] Preferably, as an improvement, the condenser is located at the top of the tower body, and is provided with a cooling water inlet and a cooling water outlet. The cooling water inlet is used to transport cooling water into the condenser to condense the material, and the cooling water outlet is used to output the cooling water after heat exchange with the material in the condenser.

[0011] Preferably, as an improvement, the material preheater is connected to the cooling water outlet, so that the high-temperature cooling water after heat exchange with the high-temperature material steam in the condenser is transported to the material preheater to preheat the material, thereby ensuring full utilization of heat during the distillation process and avoiding energy waste.

[0012] Preferably, as an improvement, a regulating valve is further provided between the material preheater, the condenser and the reboiler, and the regulating valve is used to adjust the delivery ratio of the condenser and the reboiler to the material preheater. When preheating the material, the mixing ratio of the heating water and the cooling water can be adjusted according to the actual demand and the temperature change of the heating water and the cooling water, so as to ensure the stability and accuracy of the preheating temperature in the material preheater and the effect of the material preheating process.

[0013] Preferably, as an improvement, a balance pipe is further provided between the condenser, the reboiler and the material preheater, and the balance pipe is used to transport the remaining cooling water or heating water after the condenser and the reboiler transport the cooling water and heating water to the material preheater. When the condenser and the reboiler transport the cooling water and heating water to the material preheater, the balance pipe can recycle and transport the remaining cooling water or heating water required by the material preheater, ensure the pressure balance in the transport pipeline, enable the cooling water and the heating water to circulate normally, ensure the smoothness of the discharge of the cooling water and the heating water in the condenser and the reboiler, and ensure the smooth operation of the condenser and the reboiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the heat recovery structure of the distillation tower in the embodiment of the utility model. DETAILED DESCRIPTION

[0015] The following is further described in detail through specific implementation methods:

[0016] The figure marks in the drawings of the specification include: tower body 1, reboiler 2, steam delivery pipe 201, steam water output port 202, condenser 3, cooling water input port 301, cooling water output port 302, material preheater 4, heating water input port 401, heating water output port 402, regulating valve 5, and balance pipe 6.

[0017] As attached Figure 1 As shown, a heat energy recovery structure for a distillation tower includes a tower body 1, a reboiler 2 is provided at the bottom of the tower body 1, the reboiler 2 is used to heat and reboil the material in the tower body 1, and a condenser 3 is provided at the top of the tower body 1, and the condenser 3 is used to condense the steam at the top of the tower body 1.

[0018] A distillation chamber is opened in the tower body 1, and the extension direction of the distillation chamber is consistent with the extension direction of the tower body 1. The distillation chamber is used for distilling materials. The specific structure and distribution method inside the distillation chamber are existing technologies and will not be repeated again.

[0019] The reboiler 2 is located at the bottom of the tower body 1 and is connected to the distillation chamber. The specific structure of the reboiler 2 and the reboiler heating principle are prior art and will not be described in detail here. A steam water input port is provided on the reboiler 2. The steam water input port is connected to the steam delivery pipe 201 through a pipeline. The steam water input port is used to deliver steam into the reboiler 2 to heat the material. A steam water output port 202 is also provided on the reboiler 2. The steam water output port 202 is used to discharge the heated water after heat exchange with the material.

[0020] The condenser 3 is located at the top of the tower body 1, wherein a material feed port and a material discharge port are provided on the condenser 3, and both the material feed port and the material discharge port are connected to the distillation chamber through a pipeline, and the steam generated during the distillation process is transported from the material feed port to the condenser 3 through a pipeline for condensation processing, and the liquid formed after the steam is condensed is transported from the material discharge port through a pipeline back to the distillation chamber for further processing. The condenser 3 is provided with a cooling water input port 301 and a cooling water output port 302, wherein the cooling water input port 301 is connected to the circulating water pipe through a pipeline, and the cooling water input port 301 is used to transport cooling water into the condenser 3 to condense the material. The cooling water output port 302 is used to output the cooling water after heat exchange with the material in the condenser 3. The specific structure of the condenser 3 is prior art and will not be repeated here.

[0021] A material preheater 4 is also provided at the input port of the tower body 1, wherein the material preheater 4 is connected to the distillation chamber, and the material preheater 4 is used to preheat the material transported to the distillation chamber for distillation processing. The material preheater 4 is a heat exchanger, and preferably in this embodiment, the material preheater 4 is a plate heat exchanger. In other embodiments, other heat exchangers can also be selected for preheating processing. A heating water input port 401 and a heating water output port 402 are provided on the material preheater 4, and the heating water input port 401 and the heating water output port 402 are respectively used for the input and output of heating water in the material preheater 4. The heating water input port 401 is connected to the cooling water output port 302 and the steam water output port 202 through a pipeline, and the heating water input port 401 is used to input the water in the condenser 3 and the reboiler 2 into the material preheater 4 to heat the material. The heating water output port 402 is connected to the circulating water pipe through a pipeline, so that the heating water can be reused through the circulating water pipe after the material is heated. In the distillation process, the cooling water and heating water after reboiling in the condenser 3 can be transported to the material preheater 4, and the material can be preheated by the remaining heat in the cooling water and heating water, thereby improving the utilization rate of heat. In addition, it is avoided that the material preheater 4 needs to introduce new heating water or other heating media for preheating processing when preheating the material, thereby reducing the cost of preheating processing and reducing energy loss.

[0022] A regulating valve 5 is also provided between the heating water input port 401 and the cooling water output port 302 and the steam water output port 202, and the regulating valve 5 is used to adjust the ratio of the cooling water output port 302 and the steam water output port 202 to the heating water input port 401. When preheating the material, the mixing ratio of the heating water and the cooling water can be adjusted according to the actual demand and the temperature change of the heating water and the cooling water, so as to ensure the stability and accuracy of the preheating temperature in the material preheater 4 and the effect of the material preheating process.

[0023] The cooling water outlet 302 and the steam water outlet 202 are also connected to the balance pipe 6, one end of the balance pipe 6 is connected to the cooling water outlet 302 or the heating water outlet 402, and the other end is connected to the recovery pipeline. The balance pipe 6 is used to transport the remaining cooling water or heating water after the cooling water outlet 302 and the steam water outlet 202 are transported to the heating water input port 401. When the condenser 3 and the reboiler 2 transport the cooling water and the heating water to the material preheater 4, the balance pipe 6 can recycle and transport the remaining cooling water or heating water required by the material preheater 4, ensure the balance of the pressure in the transport pipeline, enable the cooling water and the heating water to circulate normally, ensure the smoothness of the discharge of the cooling water and the heating water in the condenser 3 and the reboiler 2, and ensure the smooth operation of the condenser 3 and the reboiler 2.

[0024] The specific implementation process is as follows:

[0025] When the material is subjected to distillation processing, the material is preheated in the material preheater 4, and the preheated material is transported to the distillation chamber for distillation processing under the action of the reboiler 2 and the condenser 3. During the distillation processing, the hot water condensed or reboiled in the condenser 3 and the reboiler 2 is transported to the material preheater 4 through a pipeline to heat the material.

[0026] Compared with the prior art, in this solution, by connecting the material preheater 4 with the condenser 3 and the reboiler 2, the high-temperature cooling water after heat exchange with the high-temperature material in the condenser 3 and the heating water still containing a large amount of heat after heating the material in the reboiler 2 are transported to the material preheater 4 for preheating the material, so that the heat in the distillation process can be fully recycled and utilized, avoiding the ineffective utilization of the heat in the condenser 3 and the reboiler 2, resulting in energy waste. And the conveying ratio of the condenser 3 and the reboiler 2 is adjusted by the regulating valve 5, so as to facilitate the adjustment of the preheating temperature in the material preheater 4 during the processing process, ensure the temperature stability of the material preheater 4 during preheating, and ensure the effect of material preheating.

[0027] The above are only embodiments of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A heat recovery structure for a distillation tower, characterized in that: It includes a tower body, on which a reboiler and a condenser are provided; heating water flows in the reboiler, and the reboiler is used to heat and reboil the material in the tower body, and cooling water flows in the condenser, and the condenser is used to condense the steam in the tower body; a material preheater is also provided on the input port of the tower body, and the material preheater is connected to the reboiler and the condenser, and the material preheater is used to preheat the material for distillation processing through the cooling water in the condenser and the heating water in the reboiler.

2. A heat recovery structure for a distillation tower according to claim 1, characterized in that: The reboiler is located at the bottom of the tower body, and is provided with a steam water inlet and a heating water outlet. The heating water inlet is used to transport heating water into the reboiler to heat the material; the heating water outlet is used to discharge the heating water after heat exchange with the material.

3. A heat recovery structure for a distillation tower according to claim 2, characterized in that: The material preheater is connected to the steam water output port.

4. The heat recovery structure for a distillation tower according to claim 1, characterized in that: The condenser is located at the top of the tower body, and is provided with a cooling water inlet and a cooling water outlet. The cooling water inlet is used to transport cooling water into the condenser to condense the material, and the cooling water outlet is used to output the cooling water after heat exchange with the material in the condenser.

5. A heat recovery structure for a distillation tower according to claim 4, characterized in that: The material preheater is connected to the cooling water output port.

6. The heat recovery structure for a distillation tower according to claim 1, characterized in that: A regulating valve is also provided between the material preheater, the condenser and the reboiler, and the regulating valve is used to adjust the conveying ratio from the condenser and the reboiler to the material preheater.

7. A heat recovery structure for a distillation tower according to claim 6, characterized in that: A balance pipe is also provided between the condenser, the reboiler and the material preheater, and the balance pipe is used to transport the remaining cooling water or heating water after the condenser and the reboiler are transported to the material preheater.

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