Energy-saving chemical synthesis reaction heat recycling device

Abstract

The utility model provides energy -conserving type chemical synthesis reaction heat recycling device relates to heat recovery equipment technical field, including inner reaction cauldron, outer heat exchange jar and outer liquid storage jar, the outside of inner reaction cauldron is surrounded with outer heat exchange jar, the outside of outer heat exchange jar is surrounded with outer liquid storage jar, the inside of outer heat exchange jar is provided with inner spiral heat exchange tube, the outside annular array of inner spiral heat exchange tube is fixedly connected with the equalizing temperature part, the lower extreme of inner spiral heat exchange tube and lower communicating pipe intercommunication fixed, the outside upper and lower part of outer heat exchange jar all are provided with annular array mode with the ring flow intercommunication hole, the equalizing temperature part is through to the outside of outer heat exchange jar, and the tail end of equalizing temperature part extends to the inside of outer liquid storage jar. The heat exchange jar and inner reaction cauldron form the airtight annular cavity between, and the outer heat exchange jar realizes the heat preservation work to inner reaction cauldron, reduces the heat loss condition, solves the problem that the reaction cauldron and tubular heat exchanger all need to increase the heat preservation layer, and the equipment cost problem is increased.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery equipment technology, and in particular to an energy-saving chemical synthesis reaction heat recovery and utilization device. Background Technology

[0002] In the chemical synthesis industry, most exothermic reactions (such as esterification, hydrogenation, polymerization, oxidation, etc.) release a large amount of reaction heat. By recovering the reaction heat and using it for raw material preheating, process insulation, etc., we can turn waste into treasure, reduce dependence on external energy, and reduce environmental thermal pollution caused by heat emissions.

[0003] Traditional heat exchange devices, such as shell-and-tube heat exchangers, are set up independently. Heat loss occurs during the process from the reactor to the tube heat exchanger, reducing the utilization rate of heat recovery. At the same time, both the reactor and the tube heat exchanger need to be insulated to further reduce heat loss from the outside of the reactor and the tube heat exchanger, which increases the equipment cost. Summary of the Invention

[0004] This invention provides an energy-saving chemical synthesis reaction heat recovery and utilization device. The inner spiral heat exchange tube and the outer heat exchange tank work together to transfer the heat in the steam to the raw materials, thereby realizing the recovery and utilization of reaction heat in chemical synthesis. A closed annular cavity is formed between the outer heat exchange tank and the inner reactor. The outer heat exchange tank performs heat preservation work on the inner reactor, further reducing heat loss.

[0005] This utility model provides an energy-saving chemical synthesis reaction heat recovery and utilization device, specifically including: an inner reaction vessel, an outer heat exchange tank, and an outer liquid storage tank. The outer heat exchange tank surrounds the outer side of the inner reaction vessel, and the outer liquid storage tank surrounds the outer side of the outer heat exchange tank. The inner reaction vessel is used for exothermic synthesis reactions such as esterification and hydrogenation reactions. An upper liquid inlet pipe is connected and fixed to the upper part of the inner reaction vessel, and an upper gas collecting funnel is fixedly connected to the top of the inner reaction vessel to collect the high-temperature gas generated by the reaction. A lower liquid outlet pipe is connected and fixed to the lower part of the inner reaction vessel to discharge the reaction products.

[0006] Furthermore, the external heat exchange tank forms an annular heat exchange cavity, and an inner spiral heat exchange tube is provided inside the external heat exchange tank. A heat equalization element is fixedly connected to the outer annular array of the inner spiral heat exchange tube. The lower end of the inner spiral heat exchange tube is connected and fixed to the lower connecting pipe. Circulation connecting holes are opened in annular arrays on both the upper and lower parts of the outer side of the external heat exchange tank.

[0007] Furthermore, the heat exchanger extends to the outside of the outer heat exchange tank, and its tail end extends to the inside of the outer liquid storage tank, thereby increasing the heat exchange area and improving heat transfer efficiency.

[0008] Furthermore, the external liquid storage tank is connected to the external liquid storage tank through a circulation connecting hole, and the lower connecting pipe extends to the outside of the external liquid storage tank to discharge the condensed liquid.

[0009] Furthermore, the upper end of the inner spiral heat exchange tube is connected to the upper gas collecting funnel pipe, and the steam generated by the reaction enters the inner spiral heat exchange tube through the upper gas collecting funnel. The inner spiral heat exchange tube and the outer heat exchange tank work together to transfer the heat in the steam to the raw material as waste heat.

[0010] Furthermore, the upper part of the outer liquid storage tank is connected and fixed with an upper feed pipe, and the lower part of the outer liquid storage tank is connected and fixed with a lower discharge pipe. A closed annular cavity is formed between the outer heat exchange tank and the inner reaction vessel, and the outer heat exchange tank provides insulation for the inner reaction vessel.

[0011] Furthermore, the lower discharge pipe extends to the inside of the outer heat exchange tank, and the lower discharge pipe is connected to the upper liquid inlet pipe. A variable frequency pump is installed on the pipe, and the raw materials in the outer storage tank are driven by the pump to enter the inner reactor for chemical synthesis reaction through the lower discharge pipe connected to the upper liquid inlet pipe.

[0012] This utility model provides an energy-saving chemical synthesis reaction heat recovery and utilization device, which has the following beneficial effects:

[0013] The combination of the inner spiral heat exchange tube and the outer heat exchange tank allows the heat in the steam to be transferred to the waste heat of the raw materials, realizing the recovery and utilization of the reaction heat in chemical synthesis. The outer heat exchange tank and the inner reactor form a closed annular cavity, and the outer heat exchange tank can keep the inner reactor warm, further reducing heat loss and reducing surface heat loss compared to traditional exposed reactors.

[0014] The external liquid storage tank achieves the exchange of hot and cold liquid flow and forms a convection circulation through the circulating connecting hole and the external heat exchange tank, which enhances the flexibility of waste heat utilization. The external liquid storage tank further increases the amount of heated raw materials, improving the raw material processing capacity compared to the heat exchange tube system with unidirectional flow. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0016] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.

[0017] In the attached diagram:

[0018] Figure 1 A schematic diagram of the overall structure of this application is shown;

[0019] Figure 2 A schematic diagram of the cross-sectional structure of the external liquid storage tank of this application is shown;

[0020] Figure 3 A schematic diagram of the cross-sectional structure of the external heat exchanger tank of this application is shown;

[0021] Figure 4 A schematic diagram of the heat spreader structure of this application is shown;

[0022] Figure 5 A schematic diagram of the lower connecting pipe of this application is shown;

[0023] Figure 6 This invention illustrates a structural schematic diagram of the external liquid storage tank and the external heat exchange tank in their separated states.

[0024] Figure label:

[0025] 1. Inner reactor; 101. Upper liquid inlet pipe; 102. Upper gas collecting funnel; 103. Lower liquid outlet pipe;

[0026] 2. External heat exchanger tank; 201. Internal spiral heat exchanger tube; 202. Heat exchanger assembly; 203. Lower connecting pipe; 204. Circulation connecting hole;

[0027] 3. External storage tank; 301. Upper feed pipe; 302. Lower discharge pipe. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] Example 1: Please refer to Figures 1 to 6 :

[0030] This invention proposes an energy-saving chemical synthesis reaction heat recovery and utilization device, including an inner reaction vessel 1, an outer heat exchange tank 2, and an outer storage tank 3. The inner reaction vessel 1 is used for exothermic synthesis reactions such as esterification and hydrogenation. An upper liquid inlet pipe 101 is fixedly connected to the upper part of the inner reaction vessel 1, and an upper gas collecting funnel 102 is fixedly connected to the top of the inner reaction vessel 1 to collect the high-temperature gas generated by the reaction. A lower liquid outlet pipe 103 is fixedly connected to the lower part of the inner reaction vessel 1. 03. The reaction products are discharged. The outer heat exchange tank 2 surrounds the inner reactor 1, forming an annular heat exchange cavity. An inner spiral heat exchange tube 201 is installed inside the outer heat exchange tank 2. The inner spiral heat exchange tube 201 is made of copper with a thermal conductivity ≥380W / (m·K). The steam generated by the reaction enters the inner spiral heat exchange tube 201 through the upper gas collecting funnel 102. The inner spiral heat exchange tube 201 and the outer heat exchange tank 2 work together to transfer the residual heat of the raw materials from the steam. A heat-spreading element 202 is fixedly connected to the outer ring array of the tube 201. The lower end of the inner spiral heat exchange tube 201 is connected and fixed to the lower connecting tube 203. Circulation connecting holes 204 are opened in a ring array on the upper and lower parts of the outer heat exchange tank 2. The heat-spreading element 202 extends through to the outer side of the outer heat exchange tank 2, and its tail end extends to the inner side of the outer liquid storage tank 3, thereby expanding the heat exchange area and improving heat transfer efficiency. The outer heat exchange tank 2 is surrounded by the outer liquid storage tank 3, which is connected to the outer liquid storage tank 3 through the circulation connecting holes. 204 is connected to the outer storage tank 3. The lower connecting pipe 203 extends to the outside of the outer storage tank 3 to discharge the condensed liquid. The lower discharge pipe 302 extends to the inside of the outer heat exchange tank 2. The lower discharge pipe 302 is connected to the upper inlet pipe 101. A variable frequency pump is installed on the pipe. The raw material enters the outer storage tank 3 through the upper inlet pipe 301. The raw material in the outer storage tank 3 enters the inner reactor 1 through the lower discharge pipe 302 connected to the upper inlet pipe 101 and is driven by the pump to carry out the chemical synthesis reaction.

[0031] In this embodiment, the upper end of the inner spiral heat exchange tube 201 is connected to the upper gas collecting funnel 102. The steam generated by the reaction enters the inner spiral heat exchange tube 201 through the upper gas collecting funnel 102. The inner spiral heat exchange tube 201 and the outer heat exchange tank 2 work together to transfer the heat in the steam to the raw materials, thereby realizing the recovery and utilization of the reaction heat in chemical synthesis, shortening the distance between the inner reactor 1 and the outer heat exchange tank 2, and reducing the heat loss when flowing between the inner reactor 1 and the outer heat exchange tank 2.

[0032] In this embodiment, the upper part of the outer liquid storage tank 3 is connected and fixed with an upper feed pipe 301, and the lower part of the outer liquid storage tank 3 is connected and fixed with a lower discharge pipe 302. A closed annular cavity is formed between the outer heat exchange tank 2 and the inner reactor 1. The outer heat exchange tank 2 provides insulation for the inner reactor 1, reducing heat loss. Compared with the traditional exposed reactor, it further reduces heat loss caused by surface heat dissipation, further reduces the energy consumption required to maintain the reaction temperature, and reduces the cost of setting up the reactor insulation layer.

[0033] In this second embodiment, based on the first embodiment, the lower drain pipe 103 is connected to the inner reactor 1 to realize the recycling of the condensed liquid, which helps to reduce the temperature and reduce the loss of substances caused by steam. It also realizes the recovery of reaction gases (such as the residual heat temperature of water vapor generated by esterification reaction, 150-250℃). The cooled gas enters the inner reactor 1 through the lower drain pipe 103 to recover materials, which saves energy and reduces material loss.

[0034] The working principle of this embodiment: Chemical synthesis reactions, such as esterification, are carried out inside the inner reactor 1. Raw materials enter the outer storage tank 3 through the upper feed pipe 301. The raw materials in the outer storage tank 3 are then connected to the upper feed pipe 101 through the lower discharge pipe 302 and driven by a pump to enter the inner reactor 1 for chemical synthesis. The steam generated by the reaction enters the inner spiral heat exchange tube 201 through the upper gas collecting funnel 102. The cooperation between the inner spiral heat exchange tube 201 and the outer heat exchange tank 2 utilizes the heat from the steam to transfer the residual heat of the raw materials, thus realizing the heat of reaction in the chemical synthesis. The recyclable inner spiral heat exchange tube 201 is made of copper (thermal conductivity ≥380W / (m·K)). Its spiral winding design maximizes contact with the outer wall of the inner reactor 1 and high-temperature reaction gases, such as the 150-250℃ steam generated during esterification. This captures heat and directionally transfers it to the raw materials in the outer heat exchange tank 2. The raw materials can be stably preheated from room temperature (25℃) to 60-100℃. This reduces external heating energy consumption by 30%–40% per batch. For example, with an annual production of 1000 tons of ethyl acetate, this translates to an annual steam energy saving of approximately 1.2 × 10⁻⁶ tons. 6 GJ, a closed annular cavity is formed between the external heat exchange tank 2 and the internal reactor 1. The external heat exchange tank 2 also provides insulation for the internal reactor 1, further reducing heat loss. Compared with the traditional exposed reactor, it reduces surface heat loss by more than 60%, further reducing the energy consumption required to maintain the reaction temperature and reducing the cost of setting up the insulation layer.

[0035] The external liquid storage tank 3 achieves the exchange of hot and cold liquid flow and forms a convection circulation through the circulating connecting hole 204 and the external heat exchange tank 2, which enhances the flexibility of waste heat utilization. The external liquid storage tank 3 further expands the amount of heated raw materials, increasing the raw material processing capacity by 2-3 times compared to the heat exchange tube system with a single-direction flow. The gas waste heat of the internal spiral heat exchange tube 201 and the vessel waste heat of the external heat exchange tank 2 form a cascade recovery. Combined with the medium circulation flow of the external liquid storage tank 3 and the external heat exchange tank 2, the comprehensive utilization rate of reaction heat is increased from less than 50% in traditional devices to more than 80%, reducing environmental thermal pollution caused by reaction heat emissions.

[0036] The following points should be noted in this article:

[0037] 1. The accompanying drawings of the embodiments disclosed herein only involve structures relevant to the embodiments disclosed herein; other structures may refer to general designs.

[0038] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0039] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An energy-saving chemical synthesis reaction heat recovery and utilization device, comprising: An inner reactor (1), an outer heat exchange tank (2), and an outer liquid storage tank (3) are provided. The outer heat exchange tank (2) surrounds the outer side of the inner reactor (1), and the outer liquid storage tank (3) surrounds the outer side of the outer heat exchange tank (2). An inner spiral heat exchange tube (201) is provided inside the outer heat exchange tank (2). A heat equalization element (202) is fixedly connected to the outer side of the inner spiral heat exchange tube (201) in an annular array. The lower end of the inner spiral heat exchange tube (201) is connected and fixed to the lower connecting pipe (203). A circulating connecting hole (204) is provided in an annular array on the upper and lower parts of the outer side of the outer heat exchange tank (2).

2. The energy-saving chemical synthesis reaction heat recovery and utilization device according to claim 1, characterized in that, The upper part of the inner reactor (1) is connected to and fixed with an upper liquid inlet pipe (101), the top of the inner reactor (1) is fixedly connected with an upper gas collecting funnel (102), and the lower part of the inner reactor (1) is connected to and fixed with a lower liquid outlet pipe (103).

3. The energy-saving chemical synthesis reaction heat recovery and utilization device according to claim 1, characterized in that, The heat exchanger (202) extends through to the outside of the outer heat exchange tank (2), and the tail end of the heat exchanger (202) extends to the inside of the outer liquid storage tank (3).

4. The energy-saving chemical synthesis reaction heat recovery and utilization device according to claim 3, characterized in that, The outer liquid storage tank (3) is connected to the outer liquid storage tank (3) through the circulation communication hole (204), and the lower communication pipe (203) extends to the outside of the outer liquid storage tank (3).

5. The energy-saving chemical synthesis reaction heat recovery and utilization device according to claim 2, characterized in that, The upper end of the inner spiral heat exchange tube (201) is connected to the upper gas collecting funnel (102) pipe.

6. The energy-saving chemical synthesis reaction heat recovery and utilization device according to claim 2, characterized in that, The upper part of the outer liquid storage tank (3) is connected and fixed with an upper feed pipe (301), and the lower part of the outer liquid storage tank (3) is connected and fixed with a lower discharge pipe (302).

7. The energy-saving chemical synthesis reaction heat recovery and utilization device according to claim 6, characterized in that, The lower discharge pipe (302) extends to the inside of the outer heat exchange tank (2), and the lower discharge pipe (302) and the upper liquid inlet pipe (101) are connected.

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