Steam condensation waste heat recycling device for making and refining

Abstract

The steam condensation waste heat recycling device comprises an evaporation tank, a sugar boiling tank, a steam condensation water balance box, a tubular heater and a collection box. A recycled steam condensate outlet of the evaporation tank is communicated with a steam condensate balance box pipeline; a recycled steam condensate outlet of the sugar boiling tank is communicated with a steam condensate balance box pipeline; an outlet of the steam condensate balance box is communicated with a heat source inlet pipeline of the tubular heater; a heat source outlet of the tubular heater is communicated with a collecting box pipeline; an outlet of the collecting box is communicated with the filter-pressing seepage water storage tank through a pipeline; and a liquid inlet of the tubular heater is communicated with the mixed juice storage tank through a pipeline. The device can fully recycle waste heat of steam condensate, reduce energy consumption, guarantee a heating source of the last-effect evaporation tank and the vacuum degree of the last-effect evaporation tank, and enable steam for evaporation to be controlled more stably.

Description

Technical Field

[0001] This application relates to the field of sugar production technology, and in particular to a device for recovering and utilizing waste heat from sugar refining steam condensation. Background Technology

[0002] In sugar production, the existing treatment method for the condensate generated during evaporation and boiling is as follows: part of the condensate is used as boiler feedwater for recycling; part is used as process water; and the remaining condensate is discharged into the condensate circulation system, cooled, and then used as circulating water or equipment cooling water.

[0003] Because the condensate temperature is high, its discharge into the condensate circulation system will raise the temperature of the condensate before it is processed by the cooling system, increasing the load on the cooling system and increasing the energy consumption of the cooling equipment. Especially when the ambient temperature is high, the cooling effect of the cooling system is difficult to guarantee. The high temperature of the circulating water after cooling will further reduce the condensation efficiency of the condenser, which in turn will affect the vacuum degree of the evaporator and crystallizer, resulting in an increase in steam consumption.

[0004] Meanwhile, because the condensate temperature is high, in order to maintain a relatively stable and high vacuum in the evaporator and crystallizer, it is necessary to increase the circulating water flow rate and the energy consumption of the circulating water pump. All of these increase the production cost of the sugarcane sugar plant, and the heat of this part of the condensate cannot be effectively recovered and utilized.

[0005] The information disclosed in the background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] This application provides a device for recovering and utilizing the waste heat of condensate from refining processes to address the aforementioned technical problems. This device can fully recover the waste heat of condensate, reduce energy consumption, ensure the heating source of the last-effect evaporator and the vacuum degree of the last-effect evaporator, and make the steam control for evaporation more stable.

[0007] This application provides a device for recovering and utilizing waste heat from refining steam condensation, including: an evaporator, a sugar boiling tank, a steam condensation water balance tank, a shell-and-tube heater, and a collection tank;

[0008] The condensate recovery outlet of the evaporator is connected to the condensate balance tank pipeline;

[0009] The condensate outlet of the sugar boiling tank is connected to the condensate balance tank pipeline;

[0010] The outlet of the condensate balance box is connected to the heat source inlet pipe of the shell-and-tube heater; the heat source outlet of the shell-and-tube heater is connected to the collection box pipe.

[0011] The outlet of the collection box is connected to the pipeline of the filter press permeate storage tank;

[0012] The inlet of the tubular heater is connected to the pipeline of the mixed juice storage tank.

[0013] Preferably, the shell-and-tube heater comprises: a shell, a tube structure, and a tank;

[0014] The tubular structure is housed within the shell;

[0015] The tank body includes: a heat exchange section, an inlet chamber, and an outlet chamber; the outlet of the tubular structure is positioned directly opposite the outlet chamber; the inlet of the tubular structure is positioned directly opposite the inlet chamber.

[0016] The shell is housed within the heat exchange section.

[0017] Preferably, the shell-and-tube heater includes: mounting flanges; mounting flanges are respectively provided at both ends of the shell; the shell is detachably connected to the tank through the mounting flanges.

[0018] Preferably, it includes: a juice outlet pipe and a juice inlet pipe; the juice outlet pipe is connected to the liquid outlet chamber; the juice inlet pipe is connected to the liquid inlet chamber.

[0019] Preferably, the outlet of the vapor-condensate balance tank is connected to the inlet pipe of the shell; the outlet of the shell is connected to the collection tank pipe.

[0020] Preferably, it includes: a transfer pump, a condensate return pipe, and valves; the condensate return pipe connects the outlet of the condensate balance tank to the inlet of the shell; the transfer pump and valves are installed on the condensate return pipe.

[0021] Preferably, it includes: a water outlet pipe and a valve; the liquid outlet of the shell is connected to the collection tank through the water outlet pipe; and a valve is installed on the water outlet pipe.

[0022] Preferably, it includes: a level gauge; the level gauge is installed on the evaporator.

[0023] Preferably, it includes: an evaporation condensate recovery pipe and a valve; the evaporation condensate outlet of the evaporator is connected to the condensate balance box through the evaporation condensate recovery pipe; and a valve is installed on the evaporation condensate recovery pipe.

[0024] Preferably, it includes: a condensate recovery pipe for boiling sugar and a valve; the condensate recovery outlet of the boiling sugar tank is connected to the condensate balance box through the condensate recovery pipe for boiling sugar; and a valve is installed on the condensate recovery pipe for boiling sugar.

[0025] The beneficial effects that this application can produce include:

[0026] 1) The waste heat recovery and utilization device for condensate generated during sugar refining provided in this application can realize the recovery and utilization of waste heat from condensate generated during sugar refining, and use it as a heat source for primary heating of mixed juice, replacing the primary heating of mixed juice for extraction of juice vapor from evaporator, thereby saving heat energy, reducing fuel (bagasse) consumption, reducing the temperature and flow rate of circulating water, saving energy consumption, and reducing production costs.

[0027] 2) The waste heat recovery and utilization device for condensate from refining processes provided in this application effectively utilizes the waste heat of condensate while reducing the cooling tower load and circulating water temperature and flow rate, providing a solid guarantee for the stable vacuum of the crystallizer and evaporator. Under the condition of meeting production process requirements, it reduces steam consumption, energy consumption, and fresh water intake, and saves fuel (bagasse), achieving significant results in energy conservation, consumption reduction, and increased efficiency in production.

[0028] 3) The waste heat recovery and utilization device for refining steam provided in this application uses steam condensate instead of steam from the fourth-effect evaporation to heat the mixed juice, which can reduce the extraction of steam from the fourth-effect evaporation, ensure the heating heat source and vacuum degree of the last-effect evaporation tank, make the steam control for evaporation more stable, thereby effectively improving the evaporation efficiency, reducing the steam consumption of the evaporation station on the boiler, reducing the boiler steam load, and reducing the consumption of fuel (bagasse). Attached Figure Description

[0029] Figure 1 A schematic diagram of a refining steam condenser waste heat recovery and utilization device in at least one embodiment provided in this application;

[0030] Figure 2 A partially enlarged structural schematic diagram of the waste heat recovery and utilization device for refining steam condenser in at least one embodiment provided in this application;

[0031] Legend:

[0032] Evaporator 1, Sugar boiling tank 12, Level gauge 11, Evaporation condensate recovery pipe 112, Sugar boiling condensate recovery pipe 121, Condensate balance tank 13, Transfer pump 131

[0033] 14. Shell and tube heater; 141. Shell and tube structure; 142. Mounting flange; 143.

[0034] Collection Box 15

[0035] 132. Condensate recycling pipe; 133. Juice outlet pipe; 134. Juice inlet pipe; 135. Water outlet pipe; 136. Delivery pipe.

[0036] Valve 3. Detailed Implementation

[0037] 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 embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] Technical means not detailed in this application and not used to solve the technical problems of this application are all set according to common general knowledge in the field, and multiple common general knowledge setting methods can be implemented.

[0040] See Figures 1-2 The waste heat recovery and utilization device for refining steam condensation provided in this application includes: an evaporator 1, a sugar boiling tank 12, a steam condensate balance tank 13, a tubular heater 14, and a collection tank 15; the steam condensate outlet at the top of the evaporator 1 is connected to the liquid inlet pipe of the steam condensate balance tank 13; the steam condensate outlet at the top of the sugar boiling tank 12 is connected to the liquid inlet pipe of the steam condensate balance tank 13; the liquid outlet of the steam condensate balance tank 13 is connected to the heat source liquid inlet pipe of the tubular heater 14; the heat source liquid outlet of the tubular heater 14 is connected to the liquid inlet pipe of the collection tank 15. The outlet of the collection tank 15 is connected to the pipeline of the filter press permeate storage tank, and the liquid inlet of the tubular heater 14 is connected to the pipeline of the mixed juice storage tank.

[0041] With this configuration, the device can make full use of the waste heat of the condensate generated during the cooking process of the evaporator 1 and the sugar boiling tank 12. The temperature of the recovered condensate entering the tube heater 14 is 80-85°C. After heating the mixed juice, the temperature drops to 50-60°C and is then used in the pressing permeate and other process water, thus realizing the full utilization of the waste heat of the condensate recovery water.

[0042] Mixed juice refers to the juice extracted from sugarcane using a sugar press, where hot water is added to maximize sugar extraction. Since the resulting syrup is not just pure sugar juice, it is collectively called mixed juice. The mixed juice is introduced into the tube structure of the tubular heater 14, where it exchanges heat with the condensed water to raise its temperature from 30°C to 50-60°C, thus achieving heating.

[0043] This device uses excess condensate from evaporation and sugar boiling as a heating source instead of the IV-stage juice vapor. It heats the mixed juice in one stage at a time, raising the temperature from 30°C to 50-55°C. While meeting the production process requirements, the condensate temperature is also reduced from 80-85°C to 55-60°C. The condensate after heating can also meet the production process requirements of press permeate water, eliminating the need to add more cold water for cooling and reducing the amount of fresh water used.

[0044] Secondly, the use of condensate water for heating the mixed juice instead of extracting steam from the fourth-effect evaporator ensures the heating source and vacuum level of the final-effect evaporator, making the steam control for evaporation more stable. This effectively improves evaporation efficiency, reduces the steam consumption of the evaporation station on the boiler, lowers the boiler steam load, and reduces fuel (bagasse) consumption.

[0045] In one specific embodiment, it includes: a level gauge 11; the level gauge 11 is disposed on the evaporator 1 and is used to observe and detect the material level in the tank.

[0046] In one specific embodiment, it includes: an evaporation condensate recovery pipe 112 and a valve 3; one end of the evaporation condensate recovery pipe 112 is connected to the condensate outlet of the evaporator 1, and the other end is connected to the condensate balance box 13; the valve 3 is disposed on the evaporation condensate recovery pipe 112.

[0047] In one specific embodiment, it includes: a sugar boiling condensate recovery pipe 121 and a valve 3; one end of the sugar boiling condensate recovery pipe 121 is connected to the condensate outlet of the sugar boiling tank 12, and the other end is connected to the condensate balance box 13; the valve 3 is disposed on the sugar boiling condensate recovery pipe 121.

[0048] In one specific embodiment, the evaporation condensate recovery pipe 112, the sugar boiling condensate recovery pipe 121, and the condensate balance tank 13 are connected in parallel. With this connection, the condensate discharge can be adjusted and controlled according to the condensate discharge situation.

[0049] In one specific embodiment, the system includes a transfer pump 131, which is installed on a pipeline connecting the condensate balance tank 13 and the shell-and-tube heater 14. The transfer pump 131 can adjust the flow rate of the recovered condensate according to the heat exchange requirements.

[0050] In one specific embodiment, the shell-and-tube heater 14 includes: a tank, a shell 141, a tube structure 142, and a mounting flange 143; the tube structure 142 is housed within the shell 141; both ends of the tube structure 142 are respectively provided with openings, which are located on the outer layer of the shell 141; the shell 141 is closed on the side wall of the tube structure 142; both ends of the shell 141 are respectively provided with mounting flanges 143; the tank includes: a heat exchange section, an inlet chamber, and an outlet chamber; the outlet of the tube structure 142 is positioned directly opposite the outlet chamber; the inlet of the tube structure 142 is positioned directly opposite the inlet chamber.

[0051] The shell 141 is detached and installed inside the tank via mounting flange 143; both ends of the tank are connected to the inner cavities of the tubes in the tube structure 142; a mixture is introduced into the bottom of the tank, flows upward into the tube structure 142, exchanges heat with the recovered steam condensate flowing inside the shell 141, and then flows out from the top of the tank. In one specific embodiment, the inlet of the shell 141 is connected to the steam condensate balance tank 13 via a pipeline; the outlet of the shell 141 is connected to the collection tank 15.

[0052] In one specific embodiment, the system includes: a condensate recycling pipe 132 and a water outlet pipe 135; the inlet of the housing 141 is connected to the condensate balance tank 13 via the condensate recycling pipe 132, and a transfer pump 131 and a valve 3 are installed on the condensate recycling pipe 132. Condensate at 80-85°C is transported in the condensate recycling pipe 132. The outlet of the housing 141 is connected to the collection tank 15 via the water outlet pipe 135, and a valve 3 is installed on the water outlet pipe 135, which transports water at 50-60°C.

[0053] In one specific embodiment, it includes: a delivery pipe 136; one end of the delivery pipe 136 is connected to the outlet of the collection tank 15, and the other end is connected to the filter press permeate tank. It is used to deliver water to the filter press permeate tank and other process sections.

[0054] In one specific embodiment, the system includes: a juice outlet pipe 133 and a juice inlet pipe 134; the juice inlet pipe 134 is connected to the liquid inlet of the tank, and a valve 3 is installed on the juice inlet pipe 134; the juice inlet pipe 134 conveys mixed juice at a temperature of 30°C. The juice outlet pipe 133 is connected to the liquid outlet of the tank; a valve is installed on the juice outlet pipe 133; the juice outlet pipe 133 conveys mixed juice at a temperature of 50-60°C. The valves 3 installed on each pipeline can control the flow of each material according to production needs.

[0055] The device was put into production at Mengpeng Sugar Industry Co., Ltd. in Mengla County during the 2024 / 2025 crushing season. It can increase the inlet temperature of the mixed juice from 30℃ to 50-55℃ to better meet the production process requirements. At the same time, the steam condensate generated after heating meets the needs of the pressing permeate production process and can be preheated and recycled.

[0056] Based on calculations and on-site verification, assuming a daily sugarcane crushing capacity of 5,000 tons and a crushing season of 160 days, and using the specific heat of the mixed juice at 16°Bx as 3.718 [KJ / (kg.℃)], with the mixed juice comprising 102%, raising the temperature of the mixed juice from 30℃ to 55℃ requires the following heat: 5000 × 1000 × 102% × (55 - 30) × 3.718 = 474,045,000 (KJ). Roughly estimating based on the average calorific value of bagasse at 15,000 kJ / kg, the required bagasse consumption is: 474,045,000 ÷ 15,000 = 31,603 (kg). Considering a total crushing season processing capacity of 800,000 tons of sugarcane, requiring 160 days of processing, the aforementioned heat source modification can save approximately 5,056.48 tons of fuel (bagasse). At a selling price of 150 yuan per ton of bagasse, this can generate a profit of 758,000 yuan per year.

[0057] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steam condensate waste heat recovery device, characterized by comprising: It comprises: Evaporation tank (1), sugar boiling tank (12), condensation water balance tank (13), tube heater (14), collection tank (15); The recovery condensation water outlet of the evaporation tank (1) is in pipeline communication with the condensation water balance tank (13); The recovery condensation water outlet of the sugar boiling tank (12) is in pipeline communication with the condensation water balance tank (13); The outlet of the condensation water balance tank (13) is in pipeline communication with the heat source inlet of the tube heater (14); the heat source outlet of the tube heater (14) is in pipeline communication with the collection tank (15); The outlet of the collection tank (15) is in pipeline communication with the filter press permeate water storage tank; The liquid inlet of the tube heater (14) is in pipeline communication with the mixed juice storage tank.

2. The apparatus according to claim 1, wherein The tube heater (14) comprises: a shell (141), a tube structure (142), and a tank body; The tube structure (142) is arranged in the shell (141); The tank body comprises: a heat exchange section, a liquid inlet cavity, and a liquid outlet cavity; the liquid outlet of the tube structure (142) is arranged opposite to the liquid outlet cavity; the liquid inlet of the tube structure (142) is arranged opposite to the liquid inlet cavity; The shell (141) is arranged in the heat exchange section.

3. The apparatus according to claim 2, wherein The tube heater (14) comprises: mounting flanges (143); the two ends of the shell (141) are respectively provided with mounting flanges (143); the shell (141) is detachably connected with the tank body through the mounting flanges (143).

4. The apparatus according to claim 2, wherein It comprises: Juice outlet pipe (133) and juice inlet pipe (134); the juice outlet pipe (133) is in communication with the liquid outlet cavity; the juice inlet pipe (134) is in communication with the liquid inlet cavity.

5. The apparatus according to claim 2, wherein The liquid outlet of the condensation water balance tank (13) is in pipeline communication with the liquid inlet of the shell (141); the liquid outlet of the shell (141) is in pipeline communication with the collection tank (15).

6. The apparatus according to claim 5, wherein It comprises: Delivery pump (131), condensation water recycling pipe (132), and valve (3); the condensation water recycling pipe (132) connects the liquid outlet of the condensation water balance tank (13) and the liquid inlet of the shell (141); the delivery pump (131) and the valve (3) are arranged on the condensation water recycling pipe (132).

7. The apparatus according to claim 5, wherein It comprises: Water outlet pipe (135) and valve (3); the liquid outlet of the shell (141) and the collection tank (15) are connected through the water outlet pipe (135); the valve (3) is arranged on the water outlet pipe (135).

8. The apparatus according to claim 1, wherein It comprises: Liquid level meter (11); the liquid level meter (11) is arranged on the evaporation tank (1).

9. The apparatus according to claim 1, wherein It comprises: Evaporation condensation water recovery pipe (112) and valve (3); the recovery condensation water outlet of the evaporation tank (1) and the condensation water balance tank (13) are connected through the evaporation condensation water recovery pipe (112); the valve (3) is arranged on the evaporation condensation water recovery pipe (112).

10. The apparatus according to claim 1, wherein It comprises: Sugar boiling condensation water recovery pipe (121) and valve (3); the recovery condensation water outlet of the sugar boiling tank (12) and the condensation water balance tank (13) are connected through the sugar boiling condensation water recovery pipe (121); the valve (3) is arranged on the sugar boiling condensation water recovery pipe (121).

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