Energy-saving waste heat recovery system

Abstract

The utility model provides an energy-saving waste heat recovery system. The energy-saving waste heat recovery system comprises a reaction tower, a raw material backflow assembly and a waste heat recovery assembly, the reaction tower is used for reacting reaction raw materials and generating high-temperature steam raw materials, and the reaction tower is provided with a high-temperature steam raw material discharge port and a high-temperature steam raw material feed port; the raw material backflow assembly comprises a backflow pipeline, and the backflow pipeline is connected to the high-temperature steam raw material discharging opening and the feeding opening; the waste heat recovery assembly comprises a heat exchanger and a waste heat recovery unit, the heat exchanger is arranged on the backflow pipeline, the waste heat recovery unit is provided with a heat exchange pipeline, and the heat exchanger is used for conducting heat transfer on the high-temperature steam raw materials in the backflow pipeline and heat exchange media in the heat exchange pipeline. According to the utility model, the recovery and utilization of reaction waste heat can be realized, the heat exchange and cooling effects are achieved, and the steam which can be reused can be generated.

Description

Technical Field

[0001] The utility model relates to the technical field of energy recovery equipment, and more specifically to an energy-saving waste heat recovery system. Background Art

[0002] In existing equipment for preparing diphenyl carbonate, the DPC reaction tower generally uses a motor to drive the fan blades to generate wind for cooling. Air cooling requires power supply to the motor, which increases power consumption. At the same time, the hot air discharged by the air cooling will cause the ambient temperature around the top of the tower to rise. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] The technical problem to be solved by the utility model is that the existing DPC reaction tower cooling method consumes electricity and causes the ambient temperature around the tower top to rise.

[0005] (II) Technical solution

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model provides an energy-saving waste heat recovery system, comprising a reaction tower, a raw material reflux component and a waste heat recovery component; the reaction tower is used for supplying reaction raw materials to react and generate high-temperature steam raw materials, and the reaction tower has a high-temperature steam raw material discharge port and a feed port; the raw material reflux component comprises a reflux pipe, and the reflux pipe is connected to the high-temperature steam raw material discharge port and the feed port; the waste heat recovery component comprises a heat exchanger and a waste heat recovery unit, the heat exchanger is arranged on the reflux pipe, and the waste heat recovery unit has a heat exchange pipe, and the heat exchanger is used to transfer heat between the high-temperature steam raw material in the reflux pipe and the heat exchange medium in the heat exchange pipe.

[0008] Preferably, the raw material reflux assembly further includes a reflux tank and a reflux pump; the reflux tank and the reflux pump are provided on the reflux pipeline.

[0009] Preferably, the reaction tower further comprises a reboiler, and the reboiler is connected to the bottom of the reaction tower.

[0010] Preferably, the waste heat recovery component is a lithium bromide absorption refrigeration unit.

[0011] Preferably, the waste heat recovery unit includes a waste heat exchanger, a condenser, an absorber, an evaporator and a steam-water separator, the waste heat exchanger is connected to the condenser, the condenser is connected to the evaporator, the evaporator is connected to the absorber, the absorber is connected to the steam-water separator, the waste heat exchanger has a waste hot water inlet and a waste hot water outlet, the waste hot water inlet is connected to the outlet of the heat exchange pipe, the waste hot water outlet is connected to the inlet of the heat exchange pipe, the condenser, absorber and evaporator are used to transfer the heat of the heat exchange medium in the heat exchange pipe to the steam-water separator and form steam output.

[0012] Preferably, the waste heat recovery unit further includes a water supply pipeline, and the steam-water separator is connected to the water supply pipeline.

[0013] Preferably, the waste heat recovery unit further comprises a sewage pipe, and the sewage pipe is connected to the steam-water separator.

[0014] Preferably, the steam-water separator has a pressure relief valve outlet.

[0015] (III) Beneficial effects

[0016] The above technical solution of the utility model has at least the following advantages:

[0017] 1. In the utility model, the waste heat recovery unit has a heat exchange pipe, and the heat exchanger is used to transfer heat between the high-temperature steam raw material in the return pipe and the heat exchange medium in the heat exchange pipe. The heat in the high-temperature steam raw material is transferred to the waste heat recovery unit through the heat exchange medium, so that the waste heat recovery unit generates reusable steam, thereby realizing the recovery of waste heat.

[0018] 2. Compared with air cooling, it reduces the power loss of equipment and does not release heat into the production environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a structural schematic diagram of an energy-saving waste heat recovery system provided by an embodiment of the utility model.

[0021] Figure 2 It is a front view of the waste heat recovery unit provided in an embodiment of the utility model.

[0022] Figure 3 It is a left view of the waste heat recovery unit provided by an embodiment of the utility model.

[0023] Figure 4 It is a right view of the waste heat recovery unit provided by an embodiment of the utility model.

[0024] The reference numerals in the figures are:

[0025] 1. Reaction tower; 2. Raw material reflux assembly; 3. Waste heat recovery assembly; 4. Reboiler; 11. High-temperature steam raw material outlet; 12. Inlet; 21. Reflux pipeline; 22. Reflux tank; 23. Reflux pump; 31. Heat exchanger; 32. Waste heat recovery unit; 321. Heat exchange pipeline; 322. Waste heat exchanger; 323. Condenser; 324. Absorber; 325. Evaporator; 326. Steam-water separator; 327. Make-up water pipeline; 328. Sewage pipeline; 3221. Waste hot water inlet; 3222. Waste hot water outlet; 3231. Cooling water inlet; 3232. Cooling water outlet; 3261. Pressure relief valve outlet. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly located on the other element or indirectly located on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, and do not indicate that a device or element must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The following is a more detailed description of the specific implementation of the present utility model in conjunction with specific embodiments:

[0030] like Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the embodiment of the utility model provides an energy-saving waste heat recovery system, including a reaction tower 1, a raw material reflux component 2 and a waste heat recovery component 3; the reaction tower 1 is used for reacting the reaction raw materials and generating high-temperature steam raw materials, and the reaction tower 1 has a high-temperature steam raw material outlet 11 and an inlet 12; the raw material reflux component 2 includes a reflux pipeline 21, and the reflux pipeline 21 is connected to the high-temperature steam raw material outlet 11 and the inlet 12; the waste heat recovery component 3 includes a heat exchanger 31 and a waste heat recovery unit 32, the heat exchanger 31 is arranged on the reflux pipeline 21, and the waste heat recovery unit 32 has a heat exchange pipeline 321, and the heat exchanger 31 is used to transfer heat between the high-temperature steam raw material in the reflux pipeline 21 and the heat exchange medium in the heat exchange pipeline 321. Specifically, the reaction tower 1 is used for the production of diphenyl carbonate. The heat exchanger 31 is a plate heat exchanger or a tube heat exchanger.

[0031] As one of the optional implementations of this embodiment, the raw material reflux assembly 2 further includes a reflux tank 22 and a reflux pump 23; the reflux tank 22 and the reflux pump 23 are provided on the reflux pipeline 21. The reflux tank 22 is provided downstream of the heat exchanger 31. The high-temperature steam raw material is converted into liquid raw material after heat exchange in the heat exchanger 31. The reflux tank 22 is used to receive and store part of the liquid raw material, play a buffering role, and stabilize the hydraulic pressure in the pipe; the reflux pump 23 is used to pump the liquid raw material from the reflux tank 22 to the reaction tower 1.

[0032] As one of the optional implementations of this embodiment, the reaction tower 1 further includes a reboiler 4 , and the reboiler 4 is connected to the bottom of the reaction tower 1 .

[0033] As one of the optional implementations of this embodiment, the waste heat recovery component 3 is a lithium bromide absorption refrigeration unit.

[0034] As one of the optional implementations of this embodiment, the waste heat recovery unit 32 includes a waste heat exchanger 322, a condenser 323, an absorber 324, an evaporator 325 and a steam-water separator 326. The waste heat exchanger 322 is connected to the condenser 323, the condenser 323 is connected to the evaporator 324, the evaporator 325 is connected to the absorber 324, the absorber 324 is connected to the steam-water separator 326, the waste heat exchanger 322 has a waste hot water inlet 3221 and a waste hot water outlet 3222, the waste hot water inlet 3221 is connected to the outlet of the heat exchange pipe 321, the waste hot water outlet 3222 is connected to the inlet of the heat exchange pipe 321, the condenser 323, the absorber 324 and the evaporator 325 are used to transfer the heat of the heat exchange medium in the heat exchange pipe 321 to the steam-water separator 326 and form steam output. In this embodiment, the functions of the condenser 323, the absorber 324, the evaporator 325 and the steam-water separator 326 are the same as the functions of the corresponding structures of the lithium bromide absorption refrigeration unit in the prior art, and this application will not repeat them. The condenser 323 has a cooling water inlet 3231 and a cooling water outlet 3232, which are used to connect to a cooling water source, and the cooling water is used to perform heat exchange with a heat exchange medium to achieve cooling of the heat exchange medium. In this embodiment, since the waste heat recovery unit 32 is located near the seaside, the cooling water source is preferably seawater. Among them, the pipe diameters of the cooling water inlet 3231 and the cooling water outlet 3232 are larger than the pipe diameters of the waste hot water inlet 3221 and the waste hot water outlet 3222, so as to increase the amount of circulating cooling water, improve the cooling effect, and improve the cooling efficiency.

[0035] As one of the optional implementations of this embodiment, the waste heat recovery unit 32 further includes a water supply pipe 327, and the steam-water separator 326 is connected to the water supply pipe 327. The water supply pipe 327 is used to connect to a water supply source, and a water supply pump can be added to pump water when actually needed. The water in the water supply pipe is used for heat exchange to form steam output.

[0036] As one of the optional implementations of this embodiment, the waste heat recovery unit 32 further includes a sewage pipe 328, which is connected to the steam-water separator 326. The sewage pipe 328 is used to discharge sewage in the steam-water separator 326, and a valve is provided on the sewage pipe 328 to control the on-off of the sewage pipe 328.

[0037] As one of the optional implementations of this embodiment, the steam-water separator 326 has a pressure relief valve outlet 3261. The pressure relief valve outlet 3261 is used to release the air pressure in the steam-water separator 326.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving waste heat recovery system, characterized in that: include: A reaction tower, used for reacting the reaction raw materials and generating high-temperature steam raw materials, the reaction tower having a high-temperature steam raw material discharge port and a feed port; A raw material reflux assembly, comprising a reflux pipeline, wherein the reflux pipeline is connected to the high-temperature steam raw material outlet and the feed inlet; The waste heat recovery component includes a heat exchanger and a waste heat recovery unit. The heat exchanger is arranged on the return pipe. The waste heat recovery unit has a heat exchange pipe. The heat exchanger is used to transfer heat between the high-temperature steam raw material in the return pipe and the heat exchange medium in the heat exchange pipe.

2. The energy-saving waste heat recovery system according to claim 1, characterized in that: The raw material reflux component also includes a reflux tank and a reflux pump; the reflux tank and the reflux pump are arranged on the reflux pipeline.

3. The energy-saving waste heat recovery system according to claim 1, characterized in that: The reaction tower further includes a reboiler connected to the bottom of the reaction tower.

4. The energy-saving waste heat recovery system according to claim 1, characterized in that: The waste heat recovery component is a lithium bromide absorption refrigeration unit.

5. The energy-saving waste heat recovery system according to claim 1, characterized in that: The waste heat recovery unit includes a waste heat exchanger, a condenser, an absorber, an evaporator and a steam-water separator. The waste heat exchanger is connected to the condenser, the condenser is connected to the evaporator, the evaporator is connected to the absorber, and the absorber is connected to the steam-water separator. The waste heat exchanger has a waste hot water inlet and a waste hot water outlet. The waste hot water inlet is connected to the outlet of the heat exchange pipe, and the waste hot water outlet is connected to the inlet of the heat exchange pipe. The condenser, absorber and evaporator are used to transfer the heat of the heat exchange medium in the heat exchange pipe to the steam-water separator and form steam output.

6. The energy-saving waste heat recovery system according to claim 5, characterized in that: The waste heat recovery unit also includes a water supply pipeline, and the steam-water separator is connected to the water supply pipeline.

7. The energy-saving waste heat recovery system according to claim 5, characterized in that: The waste heat recovery unit also includes a sewage pipe, and the sewage pipe is connected to the steam-water separator.

8. The energy-saving waste heat recovery system according to claim 5, characterized in that: The steam-water separator has a pressure relief valve outlet.

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