A bdo condensate system waste heat recovery system

Abstract

The utility model relates to a kind of BDO condensate system waste heat recovery system, comprising: heating heat exchanger, the heating heat exchanger has the first side and second side with each other heat exchange, the import and export of the first side are communicated feed line and return line respectively, the import and export of the second side are communicated heating return water line and heating water line respectively;Condensate water line, one end of the condensate water line is communicated condensate input line, and condensate input line is used to transport the steam condensate generated by BDO production device, the other end of the condensate water line is communicated the feed line, to steam condensate generated by BDO production device is transported to the first side by the feed line after heat exchange and is discharged from the return line. By steam condensate waste heat in BDO production process for heating heat exchanger heating and heating line heat exchange, replace traditional steam consumption, significantly reduce energy cost.

Description

Technical Field

[0001] This utility model relates to the industrial field, and in particular to a waste heat recovery system for a BDO condensate system. Background Technology

[0002] The production process of BDO (1,4-butanediol) from formaldehyde and acetylene generates a large amount of condensate, primarily from the condensate produced after the distillation system's 2.3 MPa steam is used for heating. The condensate flow rate is approximately 100 t / h, and the temperature can reach 98-100℃. Currently, the condensate is typically cooled by circulating water in a condensate heat exchanger and then sent to public utilities for recycling. However, in practice, there are instances where the waste heat from the condensate is not fully recovered and utilized.

[0003] Heating heat exchangers typically supply steam at one end, and the steam transfers heat to the heating circuits via the heating heat exchange station. This method usually consumes 0.5 MPa of steam for heating, resulting in relatively high energy consumption.

[0004] In view of the actual problems of incomplete recovery and utilization of waste heat in BDO condensate system and high energy consumption of heating heat exchangers, this utility model uses the waste heat of steam condensate generated by BDO production unit to heat the heating pipeline, so as to make full use of the waste heat of steam condensate and save energy consumption. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a waste heat recovery system for BDO condensate system, which exchanges the waste heat of steam condensate generated by BDO production unit with heating equipment, so as to make full use of the waste heat of steam condensate and save energy consumption.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A waste heat recovery system for BDO condensate system, comprising: A heating heat exchanger having a first side and a second side for heat exchange with each other, wherein the inlet and outlet of the first side are respectively connected to a supply pipe and a return pipe, and the inlet and outlet of the second side are respectively connected to a heating return water pipe and a heating supply water pipe. The condensate supply pipeline has one end connected to the condensate input pipeline, which is used to transport the steam condensate generated by the BDO production unit. The other end of the condensate supply pipeline is connected to the supply pipeline, so that the steam condensate generated by the BDO production unit is transported to the first side through the supply pipeline, undergoes heat exchange, and is discharged from the return pipeline.

[0007] The beneficial effects of the above-mentioned technical solution of this utility model are: the waste heat of steam condensate in the BDO production process is used to heat the heating heat exchanger and exchange heat with the heating pipeline, replacing the traditional 0.5MPa steam consumption, and significantly reducing energy costs.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, it also includes: a condensate heat exchanger having a third side and a fourth side for heat exchange with each other, the inlet and outlet of the third side being connected to the circulating water supply pipeline and the circulating water return pipeline respectively, the inlet and outlet of the fourth side being connected to the condensate input pipeline and the condensate output pipeline respectively, and the condensate input through the condensate input pipeline being discharged from the condensate output pipeline after heat exchange.

[0010] The beneficial effects of adopting the above-mentioned further scheme are: it enables the cascade utilization of waste heat, with the high-temperature condensate first used for heating, and then cooled to a recoverable temperature by circulating water through a condensate heat exchanger. This avoids heat waste, reduces the condensate delivery temperature, and decreases the subsequent cooling load.

[0011] Furthermore, it also includes: a condensate return water pipeline, one end of which is connected to the return pipeline, and the other end of which is connected to the condensate input pipeline.

[0012] The beneficial effects of adopting the above-mentioned further scheme are: forming a closed-loop regulation system, controlling the condensate flow rate of the heating heat exchanger through reflux, avoiding a sudden drop in condensate temperature that would reduce heat exchange efficiency, and ensuring stable delivery of condensate to the downstream recovery node.

[0013] Furthermore, it also includes: a first switching valve, which is disposed in the condensate return water pipeline and is used to control the flow rate of the condensate return water pipeline; When the first switching valve is completely closed, the condensate return water pipeline is disconnected from the return pipeline; When the first switching valve is fully open, the condensate return water pipeline is connected to the return pipeline; Part or all of the discharge from the return pipeline is returned to the condensate input pipeline via the condensate return water pipeline.

[0014] The beneficial effects of adopting the above-mentioned further solutions are: achieving precise flow regulation: dynamically allocating the destination of condensate according to heating demand (all sent out or part returned), ensuring stable heating temperature, and adapting to changes in heat load in different seasons.

[0015] Furthermore, the condensate supply pipeline is connected to one end of the condensate input pipeline, and the condensate return pipeline is connected to the other end of the condensate input pipeline.

[0016] The beneficial effects of adopting the above-mentioned further scheme are: optimizing the fluid path, ensuring that the high-temperature condensate preferentially enters the heating heat exchanger, and the low-temperature condensate returns from the downstream point after heat exchange, thus avoiding heat loss caused by the mixing of hot and cold fluids.

[0017] Furthermore, it also includes: a temperature sensor and a controller, wherein the temperature sensor is installed on the heating water supply pipe, and the controller is electrically connected to the temperature sensor and the first switching valve; The beneficial effects of adopting the above-mentioned further solutions are: to achieve fully automatic temperature control, to monitor the temperature of heating pipes in real time, to dynamically adjust the condensate return flow through valve opening, to maintain a constant heating temperature, to reduce manual intervention and improve system reliability.

[0018] Furthermore, it also includes: a second switching valve, which is installed on the condensate supply water pipeline.

[0019] The advantages of adopting the above-mentioned further solutions are: by setting a second switching valve, the system flexibility can be enhanced, the condensate supply can be quickly cut off (such as during the non-heating season), or the condensate / steam mixing ratio can be adjusted to meet the needs of complex operating conditions.

[0020] Furthermore, it also includes: a first steam pipeline and a second steam pipeline, wherein the first steam pipeline is connected to the supply pipeline; and the second steam pipeline is connected to the return pipeline.

[0021] The beneficial effects of adopting the above-mentioned further scheme are: by setting up a first steam pipeline and a second steam pipeline, a dual heat source redundancy system is constructed, which automatically switches to steam to supplement heat when the condensate heat is insufficient, ensuring the stability of heating under extreme weather conditions; the valve control design avoids heat source interference.

[0022] Furthermore, it also includes: a third valve and a fourth valve; the third valve is disposed on the first steam pipeline; the fourth valve is disposed on the second steam pipeline.

[0023] The beneficial effects of adopting the above-mentioned further solutions are: by precisely controlling the flow rate and opening degree of the steam pipeline, the heat source supply can be precisely controlled, the control accuracy can be improved, and energy consumption can be reduced.

[0024] Furthermore, it also includes: a fifth valve, the first end, the second end, and the third end of the fifth valve being connected to the supply pipeline, the condensate water supply pipeline, and the first steam pipeline, respectively. The fifth valve can be switched to connect the condensate water supply pipeline to the supply pipeline, or the first steam pipeline to the supply pipeline, or both the condensate water supply pipeline and the first steam pipeline to the supply pipeline.

[0025] The beneficial effects of adopting the above-mentioned further scheme are as follows: By using the fifth valve, the connection between the condensate supply pipeline and the supply pipeline can be switched so that the condensate supply pipeline supplies the supply pipeline alone; or the connection between the first steam pipeline and the supply pipeline can be switched so that the first steam pipeline supplies the supply pipeline alone; or the connection between the condensate supply pipeline and the first steam pipeline can be switched so that both the condensate supply pipeline and the first steam pipeline supply the supply pipeline together. This allows the corresponding control mode to be determined according to the actual situation, fully adapting to control requirements and saving energy consumption. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the waste heat recovery system of the BDO condensate system of this utility model.

[0027] The attached diagram lists the components represented by each number as follows: 1. Heating heat exchanger; 2. Condensate supply pipeline; 3. Condensate input pipeline; 4. Condensate heat exchanger; 5. Condensate output pipeline; 6. Condensate return pipeline; 7. First switching valve; 8. Second switching valve; 9. First steam pipeline; 10. Second steam pipeline; 11. Supply pipeline; 12. Return pipeline; 13. Heating return pipeline; 14. Heating supply pipeline; 15. Condensate external pump; 16. Third valve; 17. Fourth valve; 18. Temperature sensor; 19. Controller; 20. Fifth valve; 41. Circulating water supply pipeline; 42. Circulating water return pipeline. Detailed Implementation

[0028] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0029] like Figure 1 As shown, this embodiment provides a waste heat recovery system for a BDO condensate system, including: Heating heat exchanger 1 has a first side and a second side for exchanging heat with each other. The inlet and outlet of the first side are respectively connected to the supply pipe 11 and the return pipe 12, and the inlet and outlet of the second side are respectively connected to the heating return water pipe 13 and the heating supply water pipe 14. The condensate supply pipeline 2 has one end connected to the condensate input pipeline 3, which is used to transport the steam condensate generated by the BDO production unit. The other end of the condensate supply pipeline 2 is connected to the supply pipeline 11, so that the steam condensate generated by the BDO production unit is transported through the supply pipeline 11 to the first side and exchanged with the second side before being discharged from the return pipeline 12.

[0030] The above-mentioned technical solution of this utility model uses the waste heat of steam condensate in the BDO production process to supply heat to the heating heat exchanger 1 and exchange heat with the heating pipeline, replacing the traditional 0.5MPa steam consumption and significantly reducing energy costs.

[0031] Specifically, the heating return water pipe 13 is used for water supply, and the heating supply water pipe 14 is used for drainage. During the BDO production process, the waste heat of the steam condensate is exchanged in the heating heat exchanger 1 and then transferred through the heating supply water pipe 14 for heating.

[0032] Specifically, a condensate delivery pump 15 is installed on the condensate input pipeline 3 to deliver the condensate from the condensate input pipeline 3 to the condensate water supply pipeline 2.

[0033] Based on the above technical solution, it also includes: a condensate heat exchanger 4, which has a third side and a fourth side for heat exchange with each other. The inlet and outlet of the third side are respectively connected to the circulating water supply pipeline 41 and the circulating water return pipeline 42. The inlet and outlet of the fourth side are respectively connected to the condensate input pipeline 3 and the condensate output pipeline 5. The condensate input by the condensate input pipeline 3 is discharged from the condensate output pipeline 5 after heat exchange.

[0034] The above technical solution enables the cascade utilization of waste heat. The high-temperature condensate is first used to provide heating, and then cooled to a recoverable temperature by circulating water in the condensate heat exchanger 4. This avoids heat waste, reduces the condensate delivery temperature, and decreases the subsequent cooling load.

[0035] Specifically, the circulating water supply pipe 41 is used for supplying water, and the circulating water return pipe 42 is used for draining water.

[0036] Based on the above technical solution, it also includes: a condensate return water pipeline 6, one end of which is connected to the return pipeline 12, and the other end of which is connected to the condensate input pipeline 3.

[0037] The above technical solution forms a closed-loop regulation system. By controlling the condensate flow rate of the heating heat exchanger 1 through reflux, the heat exchange efficiency is reduced due to a sudden drop in condensate temperature, while ensuring that the condensate is stably transported to the downstream recovery node.

[0038] Based on the above technical solution, it also includes: a first switching valve 7, which is disposed on the condensate return water pipeline 6 and is used to control the flow rate of the condensate return water pipeline 6; When the first switching valve 7 is completely closed, the condensate return water pipeline 6 is disconnected from the return pipeline 12; When the first switching valve 7 is fully open, the condensate return water pipeline 6 is connected to the return pipeline 12; Part or all of the discharge from the return pipe 12 is returned to the condensate input pipe 3 via the condensate return water pipe 6.

[0039] The above technical solution enables precise flow regulation: the destination of condensate is dynamically allocated according to heating demand (all sent out or part returned), ensuring stable heating temperature and adapting to changes in heat load in different seasons.

[0040] Based on the above technical solution, the condensate supply pipe 2 is connected to one end of the condensate input pipe 3, and the condensate return pipe 6 is connected to the other end of the condensate input pipe 3.

[0041] By using the above technical solution, the fluid path is optimized to ensure that the high-temperature condensate preferentially enters the heating heat exchanger 1, and the low-temperature condensate returns from the downstream point after heat exchange, thus avoiding heat loss caused by the mixing of hot and cold fluids.

[0042] Based on the above technical solution, it also includes: a temperature sensor 18 and a controller 19. The temperature sensor 18 is installed on the heating water supply pipe 14 and is used to measure the temperature on the heating water supply pipe 14. The controller 19 is electrically connected to the temperature sensor 18 and the first switching valve 7. The controller 19 controls the opening of the first switching valve 7 based on the temperature measured by the temperature sensor 18, so as to control the flow rate of the condensate return water pipeline 6.

[0043] The above technical solution enables fully automatic temperature control, real-time monitoring of heating pipe temperature, dynamic adjustment of condensate return flow through valve opening, maintaining constant heating temperature, reducing manual intervention and improving system reliability.

[0044] Based on the above technical solution, it also includes: a second switching valve 8, which is disposed on the condensate supply water pipeline 2 and is used to control the condensate supply water pipeline 2 to be fully connected or partially connected or disconnected from the supply pipeline 11.

[0045] The above technical solutions can enhance system flexibility, allowing for rapid cutoff of condensate supply (such as during non-heating seasons) or adjustment of the condensate / steam mixing ratio to adapt to complex operating conditions.

[0046] Based on the above technical solution, it also includes: a first steam pipeline 9 and a second steam pipeline 10, wherein the first steam pipeline 9 is connected to the supply pipeline 11; and the second steam pipeline 10 is connected to the return pipeline 12.

[0047] The above technical solutions construct a dual-heat-source redundant system, which automatically switches to steam for supplementary heating when the condensate heat is insufficient, ensuring heating stability under extreme weather conditions; the valve control design avoids heat source interference.

[0048] Based on the above technical solution, it also includes: a third valve 16 and a fourth valve 17. The third valve 16 is disposed on the first steam pipeline 9 and is used to control the first steam pipeline 9 to be fully connected or partially connected or disconnected from the supply pipeline 11. The fourth valve 17 is disposed on the second steam pipeline 10 and is used to control the second steam pipeline 10 to be fully connected or partially connected or disconnected from the return pipeline 12.

[0049] By employing the aforementioned technical solutions, precise control of the steam pipeline flow rate and opening degree can be achieved, thereby enabling precise control of the heat source supply, improving control accuracy, and reducing energy consumption.

[0050] Based on the above technical solution, it also includes: a fifth valve 20, the first end, the second end and the third end of the fifth valve 20 being connected to the supply pipeline 11, the condensate water supply pipeline 2 and the first steam pipeline 9 respectively. The fifth valve 20 can be switched to connect the condensate water supply pipeline 2 to the supply pipeline 11, or the first steam pipeline 9 to the supply pipeline 11, or the condensate water supply pipeline 2 and the first steam pipeline 9 to the supply pipeline 11.

[0051] Through the above technical solution, the fifth valve 20 switches the connection between the condensate supply pipeline 2 and the supply pipeline 11, so that the condensate supply pipeline 2 supplies water to the supply pipeline 11 alone; or switches the connection between the first steam pipeline 9 and the supply pipeline 11, so that the first steam pipeline 9 supplies water to the supply pipeline 11 alone; or switches the connection between the condensate supply pipeline 2 and the first steam pipeline 9, so that the condensate supply pipeline 2 and the first steam pipeline 9 supply water to the supply pipeline 11 together. Thus, the corresponding control mode can be determined according to the actual situation, fully adapting to control requirements and saving energy consumption.

[0052] Reference Figure 1 As shown, this embodiment of the utility model fully utilizes the waste heat of the condensate in the heating heat exchanger 1 by setting up a condensate water supply pipeline 2 and a condensate return water pipeline 6, thereby saving steam consumption.

[0053] In this embodiment of the invention, the first steam pipeline 9 and the second steam pipeline 10 are closed, and the steam from the original heating heat exchange station is cut off. The condensate inlet pipeline 2 and the condensate return pipeline 6 are opened, allowing heat exchange between the steam condensate and the heating pipelines, recovering the waste heat from the condensate. After heat exchange, the condensate enters the condensate return pipeline 6, then enters the condensate heat exchanger 4, and is discharged through the condensate pipeline.

[0054] In this embodiment of the utility model, the heating heat exchanger 1 adopts an automatic temperature control system. The condensate return water pipeline 6 of the heating heat exchange station is equipped with an automatic regulating valve. By setting a thermocouple temperature detection in the heating water supply pipeline 14 as a feedback signal, a logical relationship is set with the automatic control valve to adjust the opening of the regulating valve, thereby realizing automatic control of the water supply temperature of the heating heat exchanger 1.

[0055] This embodiment of the invention utilizes the waste heat of the condensate system to heat the return water of the heating heat exchange station, which can reduce steam consumption and save energy. On the other hand, after the heat from the condensate system is exchanged through the heating heat exchanger, the load on the condensate external circulating water heat exchanger is reduced, saving circulating water consumption.

[0056] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A waste heat recovery system for a BDO condensate system, characterized in that, include: Heating heat exchanger (1) has a first side and a second side for exchanging heat with each other. The inlet and outlet of the first side are respectively connected to the supply pipe (11) and the return pipe (12). The inlet and outlet of the second side are respectively connected to the heating return water pipe (13) and the heating supply water pipe (14). Condensate supply pipeline (2), one end of which is connected to condensate input pipeline (3), which is used to transport steam condensate generated by the BDO production unit, and the other end of which is connected to the supply pipeline (11).

2. The system according to claim 1, characterized in that, Also includes: The condensate heat exchanger (4) has a third side and a fourth side for heat exchange with each other. The inlet and outlet of the third side are respectively connected to the circulating water supply pipeline (41) and the circulating water return pipeline (42). The inlet and outlet of the fourth side are respectively connected to the condensate input pipeline (3) and the condensate output pipeline (5).

3. The system according to claim 2, characterized in that, Also includes: Condensate return water pipeline (6), one end of which is connected to the return pipeline (12), and the other end of which is connected to the condensate input pipeline (3).

4. The system according to claim 3, characterized in that, Also includes: The first switching valve (7) is installed on the condensate return water pipeline (6).

5. The system according to claim 4, characterized in that, The condensate supply pipe (2) is connected to one end of the condensate input pipe (3), and the condensate return pipe (6) is connected to the other end of the condensate input pipe (3).

6. The system according to claim 4 or 5, characterized in that, Also includes: Temperature sensor (18) and controller (19), wherein the temperature sensor (18) is installed on the heating water supply pipe (14), and the controller (19) is electrically connected to the temperature sensor (18) and the first switching valve (7).

7. The system according to claim 1, characterized in that, Also includes: The second switching valve (8) is installed on the condensate supply water pipeline (2).

8. The system according to claim 1 or 7, characterized in that, Also includes: The first steam pipeline (9) and the second steam pipeline (10) are connected to the supply pipeline (11) and the second steam pipeline (10) is connected to the return pipeline (12).

9. The system according to claim 8, characterized in that, Also includes: The third valve (16) and the fourth valve (17) are provided on the first steam pipeline (9) and the fourth valve (17) is provided on the second steam pipeline (10).

10. The system according to claim 9, characterized in that, Also includes: The fifth valve (20) has its first, second and third ends connected to the supply pipeline (11), the condensate water supply pipeline (2) and the first steam pipeline (9) respectively. The fifth valve (20) can be switched to connect the condensate water supply pipeline (2) to the supply pipeline (11), or the first steam pipeline (9) to the supply pipeline (11), or both the condensate water supply pipeline (2) and the first steam pipeline (9) to the supply pipeline (11).

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