Steam condensate waste heat recovery device

Abstract

The utility model discloses a steam condensate waste heat recovery device, including mount pad, the top of mount pad is firmly connected with the mounting bracket, and is installed in the mounting bracket and has the flash tank, the top of flash tank is provided with the liquid inlet pipe, and the top of flash tank is connected with the steam outlet pipe, and the outside of the flash tank of mount pad top installs the condensate water storage tank for storing the condensate water in the flash tank, and the water tank is installed on the mount pad top, and the air preheating pipe is arranged in the water tank, and the second water pump is installed on the mount pad top, the utility model has the beneficial effects: the utility model separates and recycles the steam in the high temperature condensate through the flash tank, and sends to the low pressure steam pipe network utilization, directly recycles the high grade steam latent heat, and the water tank of built -in coiled pipe heat exchanger is used to the device, and the waste heat of high temperature condensate water is used to preheat the process air, and the low grade condensate water sensible heat is fully recovered, realizes the maximization recycling of heat.

Description

Technical Field

[0001] This utility model relates to the field of chemical energy recovery and utilization technology, specifically a steam condensate waste heat recovery device. Background Technology

[0002] During production, the accompanying drying unit generates a large amount of high-temperature steam condensate. This condensate, with a temperature of approximately 130-140℃, is sent to the polymerization heat demineralization tank via a steam trap under back pressure. The condensate formed after the medium-pressure steam (750-800 kPa, around 160℃) from the medium-pressure steam network exchanges with the dry air heat exchanger is subject to incomplete steam-water separation by the steam trap during transport, resulting in steam carrying into the condensate. This steam overflows from the hot water tank's overflow outlet, causing heat loss. Simultaneously, poor drainage of the condensate frequently leads to water hammer in the system, causing damage and leaks in heat exchangers, steam traps, and pipe welds, affecting stable production and increasing equipment maintenance and replacement costs.

[0003] In existing processes, the high-temperature condensate water generated after drying and heating presents several problems during transportation. Firstly, incomplete steam separation by the steam trap results in the condensate water carrying steam, which overflows from the demineralized water tank, wasting steam. Secondly, factors such as pipeline resistance cause water hammer during condensate water transportation, leading to damage to pipelines and heat exchangers, and occasional leaks or damage at weld points and heat exchangers, increasing equipment maintenance costs and affecting stable production operation. Furthermore, the heat from the high-temperature condensate is not fully utilized, resulting in energy waste. Therefore, we propose a steam condensate waste heat recovery device. Utility Model Content

[0004] The purpose of this invention is to provide a steam condensate waste heat recovery device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a steam condensate waste heat recovery device, comprising a mounting base, a mounting frame fixedly connected to the top of the mounting base, and a flash tank installed inside the mounting frame. An inlet pipe is provided at the top of the flash tank, and a steam outlet pipe is connected to the top of the flash tank. A condensate water storage tank for storing condensate water inside the flash tank is installed on the top of the mounting base outside the flash tank. A water tank is installed on the top of the mounting base, and an air preheating pipe is provided inside the water tank. A second water pump is installed on the top of the mounting base, and the inlet end of the second water pump is connected to the bottom end of the condensate water storage tank. A second water delivery pipe is fixedly connected to the outlet end of the second water pump, and the end of the second water delivery pipe is connected to the water tank. A polymer heat demineralization tank is installed on the top of the mounting base outside the water tank.

[0006] Preferably, a first water pump is fixedly installed on the top of the mounting base between the flash tank and the condensate storage tank. The inlet of the first water pump is connected to the bottom of the flash tank, and the outlet of the first water pump is fixedly connected to a first water supply pipe, the end of which is connected to the condensate storage tank. A third water pump is fixedly installed on the top of the mounting base between the water tank and the polymer thermal demineralization tank. The inlet of the third water pump is connected to the bottom of the water tank, and the outlet of the third water pump is fixedly connected to a water pipe, the end of which is connected to the polymer thermal demineralization tank.

[0007] Preferably, the air preheating pipe has an air inlet at one end outside the water tank, and two serpentine pipes are installed inside the water tank and are connected to each other. The air preheating pipe is connected to one end of the serpentine pipe at one end inside the water tank, and the other end of the serpentine pipe passes through the water tank and is connected to an air outlet pipe.

[0008] Preferably, the serpentine tube is a heat-conducting tube.

[0009] Preferably, a drain valve is installed at the end of the liquid inlet pipe, and the end of the drain valve is connected to the water outlet pipe of the drying device.

[0010] Preferably, a safety valve and a pressure gauge are respectively installed on the outer side of the top of the flash tank.

[0011] Preferably, the steam outlet pipe, air preheating pipe, and air outlet pipe are all insulated pipes.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This invention effectively separates and recovers steam from high-temperature condensate using a flash evaporator, sending it to a low-pressure steam network for utilization, directly recovering the latent heat of high-grade steam. Subsequently, the device uses the waste heat of the high-temperature condensate water to preheat the process air through a water tank with a built-in serpentine tube heat exchanger, fully recovering the sensible heat of the low-grade condensate water. This tiered and maximized recovery and utilization of heat energy from steam and condensate water significantly reduces the consumption of fresh steam and electricity.

[0014] 2. This invention actively transports condensate using a water pump, completely avoiding the problems of poor condensate drainage and water hammer caused by insufficient back pressure and pipeline resistance in the original process. This effectively protects equipment such as heat exchangers, pipelines, and welds, extending their service life. Simultaneously, the finally cooled water is discharged into the demineralized water tank, eliminating heat loss and safety hazards caused by steam escaping from the tank, greatly improving the operational stability and reliability of the entire condensate recovery system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 3 This is a cross-sectional view of the water tank of this utility model.

[0018] In the diagram: 1. Mounting base; 2. Flash tank; 3. Liquid inlet pipe; 4. Steam trap; 5. Steam outlet pipe; 6. Pressure gauge; 7. Safety valve; 8. Mounting bracket; 9. Condensate storage tank; 10. First water pump; 11. Water tank; 12. Second water pump; 13. Polymerization heat demineralization tank; 14. Third water pump; 15. First water supply pipe; 16. Second water supply pipe; 17. Air preheating pipe; 18. Serpentine pipe; 19. Air outlet pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 and Figure 2 This utility model provides a technical solution: a steam condensate waste heat recovery device, including a mounting base 1, a mounting frame 8 fixedly connected to the top of the mounting base 1, and a flash tank 2 installed inside the mounting frame 8. A liquid inlet pipe 3 is provided at the top of the flash tank 2, and a steam outlet pipe 5 is connected to the top of the flash tank 2. A condensate water storage tank 9 for storing the condensate water inside the flash tank 2 is installed on the top of the mounting base 1 outside the flash tank 2.

[0021] A water tank 11 is installed on the top of the mounting base 1, and an air preheating pipe 17 is installed inside the water tank 11. A second water pump 12 is installed on the top of the mounting base 1, and the inlet end of the second water pump 12 is connected to the bottom end of the condensate storage tank 9. A second water supply pipe 16 is fixedly connected to the outlet end of the second water pump 12, and the end of the second water supply pipe 16 is connected to the water tank 11. A polymer heat demineralization tank 13 is installed on the top of the mounting base 1 outside the water tank 11.

[0022] It should be noted that the condensate inside the flash tank 2 is placed in the condensate storage tank 9. The water in the condensate storage tank 9 is pumped into the water tank 11 by the second water pump 12, which can heat the air inside the serpentine tube 18 inside the water tank 11 and realize the recovery and utilization of waste heat.

[0023] Please see Figure 1 and Figure 2A first water pump 10 is fixedly installed on the top of the mounting base 1 between the flash tank 2 and the condensate storage tank 9. The inlet end of the first water pump 10 is connected to the bottom of the flash tank 2, and the outlet end of the first water pump 10 is fixedly connected to a first water supply pipe 15, and the end of the first water supply pipe 15 is connected to the condensate storage tank 9. A third water pump 14 is fixedly installed on the top of the mounting base 1 between the water tank 11 and the polymer thermal demineralization tank 13. The inlet end of the third water pump 14 is connected to the bottom end of the water tank 11, and the outlet end of the third water pump 14 is fixedly connected to a water pipe, and the end of the water pipe is connected to the polymer thermal demineralization tank 13.

[0024] It should be noted that when this utility model is used, the high-temperature, high-pressure condensate from the drying device first enters the flash tank 2 through the drain valve 4 and the inlet pipe 3. Due to the sudden drop in pressure, the high-temperature condensate undergoes a "flash evaporation" effect, in which a portion of it evaporates rapidly to form condensate steam, while the remaining water temperature decreases and becomes saturated condensate water. The separated condensate steam is led out through the steam outlet pipe 5 at the top. Because of its high quality, this steam can be transported to the plant's low-pressure steam network for use in other process steps that require low-pressure steam, thus achieving efficient recovery of the latent heat of steam and fundamentally eliminating the waste of steam overflowing from the demineralized water tank. The safety valve 7 and the pressure gauge 6 are used to monitor and ensure that the flash tank 2 operates under safe pressure.

[0025] The high-temperature condensate water remaining at the bottom of the tank after flash evaporation is pumped by the first water pump 10 through the first water pipe 15 into the condensate water storage tank 9 for temporary storage. The high-temperature water stored in the condensate water storage tank 9 still contains a large amount of sensible heat. The second water pump 12 pumps this high-temperature water into the water tank 11 through the second water pipe 16. The water tank 11 is equipped with an air preheating pipe 17 and a serpentine pipe 18, which constitute a high-efficiency heat exchanger. The air to be heated enters from the air inlet of the air preheating pipe 17 and flows through the serpentine pipe 18 located inside the water tank 11. The pipe wall of the serpentine pipe 18 exchanges heat with the high-temperature condensate water in the water tank 11, transferring the heat of the water to the air flowing inside the pipe. The air is fully preheated. The preheated hot air is discharged through the air outlet pipe 19 and can be sent to the drying unit or other processes that require hot air. The sensible heat of the condensate water is recovered, reducing the steam or electricity consumption required for subsequent heating.

[0026] Please see Figure 3 The air preheating pipe 17 is located at one end outside the water tank 11 as an air inlet. There are two serpentine pipes 18 inside the water tank 11, and the two serpentine pipes 18 are connected to each other. The end of the air preheating pipe 17 inside the water tank 11 is connected to one end of the serpentine pipe 18, and the other end of the serpentine pipe 18 passes through the water tank 11 and is connected to an air outlet pipe 19.

[0027] It should be noted that the serpentine tube 18 is used to transport air to be preheated. When the air passes through the serpentine tube 18, the warm water inside the water tank 11 can heat the air inside the serpentine tube 18, transferring the heat of the water to the air flowing inside the tube. The air is fully preheated, and the preheated hot air is discharged through the air outlet tube 19 and can be sent to the drying unit or other processes that require hot air, thus recovering the sensible heat of the condensate water.

[0028] Please see Figure 3 The serpentine tube 18 is a heat pipe.

[0029] It should be noted that the serpentine tube 18 is made of a heat-conducting material. Inside the water tank 11, it can quickly conduct heat, thereby rapidly transferring heat to the air inside and preheating the air.

[0030] Please see Figure 1 A drain valve 4 is installed at the end of the liquid inlet pipe 3, and the end of the drain valve 4 is connected to the water outlet pipe of the drying device.

[0031] It should be noted that, through the steam trap 4, the high-temperature condensate water can be transported from the drying device to the flash tank 2 by back pressure.

[0032] Please see Figure 1 and Figure 2 A safety valve 7 and a pressure gauge 6 are respectively installed on the outer side of the top of the flash tank 2.

[0033] It should be noted that the pressure gauge 6 can monitor the pressure inside the flash tank 2. When the pressure exceeds the set value, the safety valve 7 will automatically open to release pressure, ensuring that the flash tank 2 operates within a safe pressure range and thus guaranteeing safety.

[0034] Please see Figure 1 and Figure 3 Steam outlet pipe 5, air preheating pipe 17 and air outlet pipe 19 are all insulated pipes.

[0035] It should be noted that the steam outlet pipe 5 transports the recovered flash steam, while the air preheating pipe 17 and the gas outlet pipe 19 transport the gas to be preheated and the gas that has been preheated. The insulation layer effectively blocks the heat exchange between the high-temperature medium inside the pipe and the external environment, ensuring that the heat is delivered to the target equipment to the maximum extent.

[0036] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", 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 connection 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.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steam condensate waste heat recovery device, characterized in that, The system includes a mounting base (1), a mounting frame (8) fixedly connected to the top of the mounting base (1), and a flash tank (2) installed inside the mounting frame (8). An inlet pipe (3) is provided at the top of the flash tank (2), and a steam outlet pipe (5) is connected to the top of the flash tank (2). A condensate storage tank (9) for storing condensate inside the flash tank (2) is installed on the top of the mounting base (1) outside the flash tank (2). A water tank (1) is installed on the top of the mounting base (1). 1), and an air preheating pipe (17) is provided in the water tank (11). A second water pump (12) is installed on the top of the mounting base (1), and the inlet end of the second water pump (12) is connected to the bottom end of the condensate storage tank (9). A second water supply pipe (16) is fixedly connected to the outlet end of the second water pump (12), and the end of the second water supply pipe (16) is connected to the water tank (11). A polymer heat demineralization tank (13) is installed on the top of the mounting base (1) outside the water tank (11).

2. The steam condensate waste heat recovery device according to claim 1, characterized in that: A first water pump (10) is fixedly installed on the top of the mounting base (1) between the flash tank (2) and the condensate storage tank (9). The inlet end of the first water pump (10) is connected to the bottom of the flash tank (2). The outlet end of the first water pump (10) is fixedly connected to a first water supply pipe (15), and the end of the first water supply pipe (15) is connected to the condensate storage tank (9). A third water pump (14) is fixedly installed on the top of the mounting base (1) between the water tank (11) and the polymer heat demineralization tank (13). The inlet end of the third water pump (14) is connected to the bottom end of the water tank (11). The outlet end of the third water pump (14) is fixedly connected to a water pipe, and the end of the water pipe is connected to the polymer heat demineralization tank (13).

3. The steam condensate waste heat recovery device according to claim 1, characterized in that: The air preheating pipe (17) is located at one end outside the water tank (11) as an air inlet. The water tank (11) is equipped with two serpentine pipes (18) and the two serpentine pipes (18) are connected to each other. One end of the air preheating pipe (17) located inside the water tank (11) is connected to one end of the serpentine pipe (18). The other end of the serpentine pipe (18) passes through the water tank (11) and is connected to an air outlet pipe (19).

4. The steam condensate waste heat recovery device according to claim 3, characterized in that: The serpentine tube (18) is a heat pipe.

5. The steam condensate waste heat recovery device according to claim 1, characterized in that: The end of the liquid inlet pipe (3) is equipped with a drain valve (4), and the end of the drain valve (4) is connected to the water outlet pipe of the drying device.

6. The steam condensate waste heat recovery device according to claim 1, characterized in that: A safety valve (7) and a pressure gauge (6) are respectively installed on the outer side of the top of the flash tank (2).

7. A steam condensate waste heat recovery device according to claim 3, characterized in that: The steam outlet pipe (5), air preheating pipe (17) and air outlet pipe (19) are all insulated pipes.

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