A waste heat cascade utilization system for hydrogen peroxide production process

Abstract

This invention provides a waste heat cascade utilization system for hydrogen peroxide production, including a hydrogenated liquid regeneration circuit, a working fluid regeneration circuit, and a hydrogenated liquid working fluid heat exchanger. The hydrogenated liquid regeneration circuit includes a hydrogenated liquid self-heat exchanger, a hydrogenated liquid heater, and a first bleached clay bed. The working fluid regeneration circuit includes a working fluid self-heat exchanger, a working fluid heater, and a second bleached clay bed. The outlet of the first bleached clay bed is connected to the inlet of the hot medium channel of the hydrogenated liquid self-heat exchanger; the outlet of the hot medium channel of the hydrogenated liquid self-heat exchanger is connected to the inlet of the hot medium channel of the working fluid heat exchanger; the outlet of the cold medium channel of the working fluid self-heat exchanger is connected to the inlet of the cold medium channel of the working fluid heat exchanger; the outlet of the cold medium channel of the working fluid heat exchanger is connected to the inlet of the working fluid heater; and the outlet of the working fluid heater is connected to the inlet of the second bleached clay bed. This invention forms a waste heat cascade utilization structure with one source and two uses.

Description

Technical Field

[0001] This utility model relates to an energy recovery system for hydrogen peroxide production, specifically a waste heat cascade utilization system for the hydrogen peroxide production process, belonging to the field of chemical equipment technology. Background Technology

[0002] Industrial-grade hydrogen peroxide is currently mainly produced using the anthraquinone process. In the anthraquinone process, to maintain the activity of the working fluid and the stability of the process, continuous regeneration of byproducts and degradation products generated during production is essential. These degradation products mainly originate from two stages: first, during hydrogenation, the carbonyl bond may undergo hydrogenolysis or deep hydrogenation of aromatic rings due to the action of the catalyst; second, during oxidation, the components of the working fluid may also undergo oxidative degradation.

[0003] Currently, the industry standard for regeneration involves passing a working fluid or hydrogenated liquid containing degradation products through a bed of activated alumina or similar clay at a specific temperature. This requires heating the liquid before regeneration and then cooling it afterward to meet the requirements of subsequent storage or processes. This necessary "heat-then-cool" cycle results in significant energy consumption and is one of the key factors limiting the energy cost of hydrogen peroxide production.

[0004] To alleviate this problem, existing technologies generally employ self-heat recovery solutions. Specifically, both the hydrogenated liquid regeneration loop and the working fluid regeneration loop typically use the following independent heat recovery system structure: the cold liquid to be regenerated first enters a heat exchanger, where it preheats and exchanges heat with the hot liquid after passing through the regeneration bed. The preheated liquid is then finally heated by a steam heater before being sent to the regeneration bed. After passing through the regeneration bed, the hot liquid releases some heat in the heat exchanger and is finally cooled by a terminal cooler before entering the storage tank. In this independent heat recovery system, the heat recovery of each loop is limited to its own internal components. After heat exchange, the hot fluid itself still carries a considerable amount of unused residual heat, which is ultimately carried away by the cooling medium, resulting in wasted thermal energy. Utility Model Content

[0005] Based on the above background, the purpose of this utility model is to provide a waste heat cascade utilization system for the hydrogen peroxide production process, and to solve the technical problem of heat energy waste caused by incomplete waste heat recovery in the hydrogen peroxide production process in the prior art.

[0006] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0007] A waste heat cascade utilization system for hydrogen peroxide production includes a hydrogenated liquid regeneration circuit, a working liquid regeneration circuit, and a hydrogenated liquid working liquid heat exchanger connecting the hydrogenated liquid regeneration circuit and the working liquid regeneration circuit. The hydrogenated liquid regeneration circuit includes a hydrogenated liquid self-heat exchanger, a hydrogenated liquid heater, and a first bleaching clay bed. The working liquid regeneration circuit includes a working liquid self-heat exchanger, a working liquid heater, and a second bleaching clay bed. The outlet of the first bleaching clay bed is connected to the inlet of the hot medium channel of the hydrogenated liquid self-heat exchanger. The outlet of the hot medium channel of the hydrogenated liquid self-heat exchanger is connected to the inlet of the hot medium channel of the hydrogenated liquid working liquid heat exchanger. The outlet of the cold medium channel of the working liquid self-heat exchanger is connected to the inlet of the cold medium channel of the hydrogenated liquid working liquid heat exchanger. The outlet of the cold medium channel of the hydrogenated liquid working liquid heat exchanger is connected to the inlet of the working liquid heater. The outlet of the working liquid heater is connected to the inlet of the second bleaching clay bed.

[0008] By using a heat exchanger to heat-couple the hydrogen regeneration circuit and the working fluid regeneration circuit, not only is heat recovery achieved in each circuit, but the residual heat remaining in the hydrogen circuit after the first recovery is also transferred to the working fluid circuit in a stepped manner.

[0009] Preferably, the outlet of the cold medium channel of the hydrogenated liquid's own heat exchanger is connected to the inlet of the hydrogenated liquid heater, and the outlet of the hydrogenated liquid heater is connected to the inlet of the first clay bed.

[0010] Preferably, the outlet of the second clay bed is connected to the inlet of the heat medium channel of the working fluid's own heat exchanger.

[0011] Preferably, the hydrogenated liquid regeneration circuit further includes a hydrogenated liquid filter, a hydrogenated liquid cooler, and a hydrogenated liquid storage tank, and the heat medium channel outlet of the hydrogenated liquid working fluid heat exchanger is sequentially connected to the hydrogenated liquid filter, the hydrogenated liquid cooler, and the hydrogenated liquid storage tank.

[0012] Preferably, the working fluid regeneration circuit further includes a primary filter, a secondary filter, and a regeneration fluid storage tank, with the heat medium channel outlet of the working fluid's own heat exchanger sequentially connected to the primary filter, the secondary filter, and the regeneration fluid storage tank.

[0013] Preferably, both the hydrogenated liquid heater and the working fluid heater are connected to an external steam source.

[0014] Preferably, the heat exchanger for the hydrogenated liquid itself, the heat exchanger for the working fluid itself, and the heat exchanger for the hydrogenated liquid working fluid are all plate heat exchangers.

[0015] Preferably, a first flow control valve is provided on the inlet pipe of the hot medium channel of the hydrogenated working fluid heat exchanger, and a second flow control valve is provided on the inlet pipe of the cold medium channel of the hydrogenated working fluid heat exchanger.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] This utility model discloses a waste heat cascade utilization system for hydrogen peroxide production. By adding a heat exchanger for the hydrogenated liquid working fluid and constructing a specific pipeline connection, the waste heat material in the hydrogenated liquid regeneration loop, which still retains a relatively high temperature after the first stage of self-heat recovery, is used to preheat the material in the working fluid regeneration loop. This forms a waste heat cascade utilization structure with one source and two uses, recovering the heat that would be directly cooled and discharged in the traditional process. It can reduce the steam consumption of the working fluid heater and reduce the total energy consumption of the entire system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a waste heat cascade utilization system in the hydrogen peroxide production process according to this utility model.

[0020] In the diagram: 1. Heat exchanger for hydrogenated liquid itself; 2. Heater for hydrogenated liquid; 3. First clay bed; 4. Heat exchanger for working fluid itself; 5. Heater for working fluid; 6. Second clay bed; 7. Heat exchanger for hydrogenated liquid working fluid; 8. Hydrogenated liquid filter; 9. Hydrogenated liquid cooler; 10. Hydrogenated liquid storage tank; 11. Primary filter; 12. Secondary filter; 13. Regenerated liquid storage tank. Detailed Implementation

[0021] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0022] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the field. Unless otherwise specified, the methods in the following embodiments are conventional methods in the field. Unless otherwise specified, the components or equipment in the following embodiments are general standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0023] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following detailed description, many specific details are set forth to facilitate explanation and provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may be practiced by those skilled in the art without these specific details.

[0024] like Figure 1 As shown in the figure, an embodiment of the present invention discloses a waste heat cascade utilization system for hydrogen peroxide production process, including a hydrogenated liquid regeneration circuit, a working fluid regeneration circuit, and a hydrogenated liquid working fluid heat exchanger 7 connecting the hydrogenated liquid regeneration circuit and the working fluid regeneration circuit.

[0025] The hydrogenated liquid regeneration circuit includes a hydrogenated liquid self-heat exchanger 1, a hydrogenated liquid heater 2, and a first clay bed 3. The outlet of the first clay bed 3 is connected to the inlet of the hot medium channel of the hydrogenated liquid self-heat exchanger 1, the outlet of the hot medium channel of the hydrogenated liquid self-heat exchanger 1 is connected to the inlet of the hot medium channel of the hydrogenated liquid working fluid heat exchanger 7, the outlet of the cold medium channel of the hydrogenated liquid self-heat exchanger 1 is connected to the inlet of the hydrogenated liquid heater 2, and the outlet of the hydrogenated liquid heater 2 is connected to the inlet of the first clay bed 3. The hydrogenated liquid regeneration circuit also includes a hydrogenated liquid filter 8, a hydrogenated liquid cooler 9, and a hydrogenated liquid storage tank 10. The outlet of the hot medium channel of the hydrogenated liquid working fluid heat exchanger 7 is sequentially connected to the hydrogenated liquid filter 8, the hydrogenated liquid cooler 9, and the hydrogenated liquid storage tank 10.

[0026] The working fluid regeneration circuit includes a working fluid self-heat exchanger 4, a working fluid heater 5, and a second clay bed 6. The cold medium channel outlet of the working fluid self-heat exchanger 4 is connected to the cold medium channel inlet of the hydrogenated working fluid heat exchanger 7. The cold medium channel outlet of the hydrogenated working fluid heat exchanger 7 is connected to the inlet of the working fluid heater 5. The outlet of the working fluid heater 5 is connected to the inlet of the second clay bed 6. The outlet of the second clay bed 6 is connected to the hot medium channel inlet of the working fluid self-heat exchanger 4. The working fluid regeneration circuit also includes a primary filter 11, a secondary filter 12, and a regeneration fluid storage tank 13. The hot medium channel outlet of the working fluid self-heat exchanger 4 is sequentially connected to the primary filter 11, the secondary filter 12, and the regeneration fluid storage tank 13.

[0027] Both the hydrogenated liquid heater 2 and the working fluid heater 5 are connected to an external steam source. The hydrogenated liquid self-heating exchanger 1, the working fluid self-heating exchanger 4, and the hydrogenated liquid working fluid heat exchanger 7 are all plate heat exchangers. A first flow control valve is installed on the inlet pipe of the hot medium channel of the hydrogenated liquid working fluid heat exchanger 7, and a second flow control valve is installed on the inlet pipe of the cold medium channel of the hydrogenated liquid working fluid heat exchanger 7.

[0028] The workflow of the waste heat cascade utilization system in the hydrogen peroxide production process is as follows.

[0029] The regenerated hydrogenated liquid (approximately 48-55°C) from the outside first enters the cold medium channel of the hydrogenated liquid's own heat exchanger 1. Simultaneously, the high-temperature hydrogenated liquid (approximately 68-70°C) flowing out from the outlet of the first clay bed 3 enters the hot medium channel of the hydrogenated liquid's own heat exchanger 1. Here, the high-temperature hydrogenated liquid transfers heat to the low-temperature hydrogenated liquid, achieving the first stage of heat recovery. After heat exchange, the low-temperature hydrogenated liquid is preheated, while the high-temperature hydrogenated liquid cools down to approximately 60-62°C.

[0030] After being preheated by the hydrogenated liquid's own heat exchanger 1, the hydrogenated liquid enters the hydrogenated liquid heater 2, where it is further heated by an external steam source to the target temperature required for the regeneration process (approximately 68-70°C). It then enters the first clay bed 3 for regeneration. The hot hydrogenated liquid (approximately 60-62°C) flowing out of the first clay bed 3 and having completed the first stage of heat recovery via the hydrogenated liquid's own heat exchanger 1 is introduced into the inlet of the heat medium channel of the hydrogenated liquid working fluid heat exchanger 7 for the next stage of cascade heat exchange.

[0031] The external working fluid (approximately 53-55°C) enters the cold medium channel of the working fluid's own heat exchanger 4. At the same time, the high-temperature working fluid (approximately 58-60°C) flowing out from the outlet of the second clay bed 6 enters the hot medium channel of the working fluid's own heat exchanger 4 to preheat the incoming cold working fluid.

[0032] The working fluid, preheated by its own heat exchanger 4, enters the cold medium channel of the hydrogenated working fluid heat exchanger 7. Here, it exchanges heat with the hot hydrogenated fluid (approximately 60-62°C) from the hydrogenated regeneration circuit and is further heated. This step makes full use of the waste heat from the hydrogenated circuit.

[0033] The working fluid, after being further heated by the hydrogenated working fluid heat exchanger 7, enters the working fluid heater 5, where it receives final supplemental heating from an external steam source, and then enters the second clay bed 6 for regeneration. Since the hydrogenated working fluid heat exchanger 7 already provides some heat, the amount of steam required by the working fluid heater 5 is significantly reduced.

[0034] After the hot hydrogenated liquid, which has been released from the working fluid heat exchanger 7, has its cascade utilization value, it flows out from the outlet of its hot medium channel (at a temperature of about 55-58°C), and then enters the hydrogenated liquid filter 8 for filtration, enters the hydrogenated liquid cooler 9 for final cooling (to about 49-51°C), and finally enters the hydrogenated liquid storage tank 10 for storage.

[0035] After releasing heat in the working fluid heat exchanger 4, the working fluid flows out from its heat medium channel outlet (at a temperature of about 53-55℃), and then enters the primary filter 11 and the secondary filter 12 in sequence. The filtered liquid enters the regeneration liquid storage tank 13 for storage.

[0036] The hydrogen regeneration circuit and the working fluid regeneration circuit are thermally coupled by the hydrogenated liquid working fluid heat exchanger 7. The waste heat after the first heat exchange in the hydrogenated liquid regeneration circuit is successfully used to heat the material in the working fluid regeneration circuit, realizing the cascade utilization of heat and significantly improving the energy utilization efficiency of the system without adding complicated equipment.

[0037] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A cascaded utilization system of waste heat of a hydrogen peroxide production process, characterized by: The waste heat utilization system of the hydrogen peroxide production process includes a hydrogenated liquid regeneration circuit, a working liquid regeneration circuit, and a hydrogenated liquid working liquid heat exchanger (7) connecting the hydrogenated liquid regeneration circuit and the working liquid regeneration circuit. The hydrogenated liquid regeneration circuit includes a hydrogenated liquid self-heat exchanger (1), a hydrogenated liquid heater (2), and a first bleaching bed (3). The working liquid regeneration circuit includes a working liquid self-heat exchanger (4), a working liquid heater (5), and a second bleaching bed (6). The outlet of the first bleaching bed (3) is connected to the hydrogenated liquid itself. The inlet of the heat medium channel of the heat exchanger (1) is connected to the outlet of the heat medium channel of the hydrogenated liquid self-heating exchanger (1), which is connected to the inlet of the heat medium channel of the hydrogenated liquid working fluid heat exchanger (7). The outlet of the cold medium channel of the working fluid self-heating exchanger (4) is connected to the inlet of the cold medium channel of the hydrogenated liquid working fluid heat exchanger (7). The outlet of the cold medium channel of the hydrogenated liquid working fluid heat exchanger (7) is connected to the inlet of the working fluid heater (5), which is connected to the inlet of the second clay bed (6).

2. A system for the cascade utilization of waste heat from a hydrogen peroxide production process according to claim 1, characterized in that: The cold medium channel outlet of the hydrogenated liquid self-heat exchanger (1) is connected to the inlet of the hydrogenated liquid heater (2), and the outlet of the hydrogenated liquid heater (2) is connected to the inlet of the first clay bed (3).

3. A system for the cascade utilization of waste heat from a hydrogen peroxide production process according to claim 1, characterized in that: The outlet of the second clay bed (6) is connected to the inlet of the heat medium channel of the working fluid self-heat exchanger (4).

4. A system for the cascade utilization of waste heat from a hydrogen peroxide production process according to claim 1, characterized in that: The hydrogenated liquid regeneration circuit also includes a hydrogenated liquid filter (8), a hydrogenated liquid cooler (9), and a hydrogenated liquid storage tank (10). The heat medium channel outlet of the hydrogenated liquid working fluid heat exchanger (7) is sequentially connected to the hydrogenated liquid filter (8), the hydrogenated liquid cooler (9), and the hydrogenated liquid storage tank (10).

5. A system for the cascade utilization of waste heat from a hydrogen peroxide production process according to claim 1, characterized in that: The working fluid regeneration circuit also includes a primary filter (11), a secondary filter (12), and a regeneration fluid storage tank (13). The heat medium channel outlet of the working fluid heat exchanger (4) is sequentially connected to the primary filter (11), the secondary filter (12), and the regeneration fluid storage tank (13).

6. A system for the cascade utilization of waste heat from a hydrogen peroxide production process according to claim 1, characterized in that: Both the hydrogenated liquid heater (2) and the working liquid heater (5) are connected to an external steam source.

7. A waste heat cascade utilization system for hydrogen peroxide production process according to claim 1, characterized in that: The hydrogenated liquid self-heat exchanger (1), the working fluid self-heat exchanger (4), and the hydrogenated liquid working fluid heat exchanger (7) are all plate heat exchangers.

8. A system for the cascade utilization of waste heat from a hydrogen peroxide production process according to claim 1, characterized in that: A first flow control valve is provided on the inlet pipe of the hot medium channel of the hydrogenated working fluid heat exchanger (7), and a second flow control valve is provided on the inlet pipe of the cold medium channel of the hydrogenated working fluid heat exchanger (7).

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