Steam waste heat recycling device

Abstract

The utility model provides a steam waste heat recycling device which comprises a box body, a heat exchange cavity is formed in the box body, a plurality of vertical partition plates dividing the heat exchange cavity into independent sealed pressurizing chambers are vertically fixed in the heat exchange cavity, the top of each pressurizing chamber communicates with an air inlet pipe through an air inlet branch pipe, and a one-way valve and an air path valve are installed on the air inlet branch pipe; an exhaust pipe used for pressure relief is arranged at the bottom of each pressurizing chamber, an S-shaped heat exchange pipe is arranged in each pressurizing chamber, the lower ends of the heat exchange pipes are communicated with the water inlet pipe, the upper ends of the heat exchange pipes are communicated with the water outlet pipe, and waterway valves are installed at the two ends of the heat exchange pipes respectively. According to the steam waste heat recycling device, steam is compressed through the compressor, the saturation temperature of the steam is effectively increased, the heat transfer temperature difference is increased, and the heat exchange efficiency is improved. And meanwhile, more heat can be recycled through latent heat released during condensation of the high-pressure steam, and the utilization rate of waste heat is increased. By controlling the water path valve and the air path valve, each pressurizing chamber circularly carries out four-stage steps, so that the water outlet pipe has continuous water flow.

Description

TECHNICAL FIELD

[0001] The present application relates to steam waste heat recycling technology in production, especially to a steam waste heat recycling device. BACKGROUND

[0002] In many industrial production processes, such as chemical industry, power, papermaking and other industries, steam is widely used as a heating medium. After these steam completes its process task, it often still contains a large amount of heat, i.e. waste heat. The traditional method is to directly discharge the waste heat steam into the atmosphere, which causes great waste of energy and aggravates environmental pollution.

[0003] The existing steam waste heat recycling device uses a fan to guide the steam into a heat exchanger, and recycles the waste heat in the steam by heat exchange between the steam and the cold water in the heat exchanger. Because the steam and the cold water in the heat exchanger are in contact and heat exchange at normal pressure, the steam has low density and low saturation temperature, and the heat exchange efficiency is low, so the utilization rate of the waste heat in the steam is also low. CONTENT OF THE INVENTION

[0004] The present application provides a steam waste heat recycling device to solve the problem of low heat exchange efficiency of the existing steam waste heat recycling device and the problem that the cold water needs to be in contact with the steam for a long time to continuously discharge water during heat exchange.

[0005] The present application provides a steam waste heat recycling device, which comprises a box body, a heat exchange cavity is arranged in the box body, a plurality of vertical partition plates are vertically fixed in the heat exchange cavity to divide the heat exchange cavity into independent sealed pressurized chambers, the top of each pressurized chamber is communicated with an air inlet pipe through an air inlet branch pipe, a one-way valve and an air path valve are installed on the air inlet branch pipe, an exhaust pipe for pressure relief is arranged at the bottom of the pressurized chamber, an S-shaped heat exchange pipe is arranged in each pressurized chamber, the lower end of the heat exchange pipe is communicated with a water inlet pipe, and the upper end of the heat exchange pipe is communicated with a water outlet pipe, and a water path valve is installed at each end of the heat exchange pipe.

[0006] Optionally, a horizontal partition plate is sealingly fixed below the heat exchange cavity, the horizontal partition plate divides the lower part in the box body into a condensation cavity, the exhaust pipe is installed on the horizontal partition plate to discharge the condensed water and steam in the heat exchange cavity into the condensation cavity, and an air path valve is installed on the exhaust pipe.

[0007] Optionally, the water inlet pipe is communicated with the heat exchange pipe through a water inlet branch pipe, and the water inlet branch pipe is arranged in the condensation cavity and can be preheated by the discharged steam.

[0008] Optionally, the exhaust pipe and the water inlet branch pipe are arranged in parallel, and a plurality of exhaust ports are installed on the side wall of the exhaust pipe and face the water inlet branch pipe.

[0009] Optionally, a condensed water pipe is installed at the bottom of the box body and communicated with the condensation cavity.

[0010] The steam waste heat recovery device provided in this application utilizes a compressor to compress the steam injected into the heat exchange chamber before exchanging heat with the cold water in the heat exchange tubes. Compression effectively increases the saturation temperature of the steam, widening the temperature difference between the steam and water, thereby improving heat exchange efficiency. Simultaneously, high-pressure steam releases more latent heat upon condensation than low-pressure steam, allowing for the recovery of more heat and enhancing waste heat utilization.

[0011] Furthermore, by controlling the water and gas valves, the pressurized chambers within the heat exchange cavity can sequentially undergo four stages: cold water injection, steam injection, continuous heat exchange, and water release and pressure relief, thus improving heat exchange efficiency without affecting the continuous water flow in the outlet pipe. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a front view of a steam waste heat recovery device provided in an embodiment of this application;

[0014] Figure 2 A steam waste heat recovery device provided in an embodiment of this application Figure 1 Top view;

[0015] Figure 3 A steam waste heat recovery device provided in an embodiment of this application Figure 1 A sectional view;

[0016] Figure 4 A steam waste heat recovery device provided in an embodiment of this application Figure 2 A sectional view.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Box body; 2. Horizontal partition; 3. Vertical partition; 4. Water inlet pipe; 5. Water inlet branch pipe; 6. Heat exchange pipe; 7. Water outlet pipe; 8. Water valve; 9. Air inlet pipe; 10. Air inlet branch pipe; 11. Check valve; 12. Air valve; 13. Exhaust pipe; 14. Exhaust port; 15. Condensate pipe. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0020] like Figures 1-4 As shown, one embodiment of this application provides a steam waste heat recovery device, including a housing 1, within which a heat exchange chamber is provided. Multiple vertical partitions 3 are vertically fixed within the heat exchange chamber, dividing it into independent sealed pressurization chambers. The top of each pressurization chamber is connected to an inlet pipe 9 via an inlet branch pipe 10. The inlet pipe 9 is connected to a steam discharge port via a compressor. A one-way valve 11 and a gas passage valve 12 are installed on the inlet branch pipe 10. An exhaust pipe 13 for depressurization is provided at the bottom of the pressurization chamber. Each pressurization chamber is equipped with an S-shaped heat exchange tube 6, the lower end of which is connected to a water inlet pipe 4, and the upper end of which is connected to a water outlet pipe 7. Water passage valves 8 are installed at both ends of the heat exchange tube 6.

[0021] During operation, control the water valve 8 to inject cold water into the heat exchange tube 6 through the inlet pipe 4. Simultaneously, the compressor, connected to the steam outlet, injects steam into the heat exchange chamber through the inlet pipe 9 and inlet branch pipe 10, and pressurizes it through compression, generating high-pressure steam in the heat exchange chamber to exchange heat with the cold water in the heat exchange tube 6. After heat exchange is complete, the water in the heat exchange tube 6 is discharged through the outlet pipe 7, and the steam in the heat exchange chamber is released through the exhaust pipe 13, along with the condensate.

[0022] Each heat exchange in the pressurization chamber requires four stages: injecting cold water, injecting steam, continuous heat exchange, and releasing water and depressurizing. By controlling the valves, the pressurization chamber can be operated sequentially through these four stages, ensuring that each pressurization chamber is in one stage and forming a cycle. This maintains a continuous flow of water from one set of heat exchange tubes 6 to the outlet pipe 7.

[0023] In this embodiment, a compressor is used to compress the steam injected into the heat exchange chamber before it exchanges heat with the cold water in the heat exchange tube 6. Compression effectively increases the saturation temperature of the steam and increases the temperature difference between the steam and water, thereby improving the heat exchange efficiency. At the same time, high-pressure steam releases more latent heat during condensation than low-pressure steam, allowing for the recovery of more heat and improving the utilization rate of waste heat.

[0024] Furthermore, by controlling the water and gas valves, the pressurized chambers within the heat exchange cavity can sequentially undergo four stages: cold water injection, steam injection, continuous heat exchange, and water release and pressure relief, thus improving heat exchange efficiency without affecting the continuous water flow in the outlet pipe 7.

[0025] In one possible implementation, a horizontal partition 2 is sealed and fixed below the heat exchange chamber, the horizontal partition 2 separates the lower part of the box 1 into the condensation chamber, the exhaust pipe 13 is installed on the horizontal partition 2 to discharge the condensate and steam in the heat exchange chamber into the condensation chamber, and an air passage valve 12 is installed on the exhaust pipe 13.

[0026] The upper part of the housing 1 is divided into a heat exchange chamber by the partition 2, which does not affect the heat exchange of the steam in the pressurization chamber after pressurization. The lower part of the partition 2 is the condensation chamber. After the steam and condensate in the pressurization chamber are depressurized, they are discharged into the condensation chamber through the exhaust pipe 13. After further cooling in the condensation chamber, they are collected as condensate and temporarily stored.

[0027] In one possible implementation, the water inlet pipe 4 is connected to the heat exchange pipe 6 via a water inlet branch pipe 5, and the water inlet branch pipe 5 is located in the condensation chamber and can be preheated by the discharged steam.

[0028] The water inlet branch pipe 5 is located inside the condensing chamber. It is connected to each heat exchange tube 6 in parallel through multiple water inlet branch pipes 5. It can preheat the water in the water inlet branch pipe 5 inside the condensing chamber by utilizing the secondary waste heat and the residual temperature of the condensate after steam heat exchange, thereby improving the utilization rate of waste heat.

[0029] In one possible implementation, the exhaust pipe 13 is arranged parallel to the water inlet branch pipe 5, and a plurality of exhaust ports 14 fixed toward the water inlet branch pipe 5 are installed on the side wall of the exhaust pipe 13.

[0030] When the heat exchange chamber is depressurized, steam and condensate are discharged from the exhaust port 14 to the water inlet branch pipe 5 through the exhaust pipe 13. This allows the steam entering the condensation chamber to have more full contact with the water inlet branch pipe 5, further improving the preheating effect on the cold water in the water inlet branch pipe 5. The condensate formed after contact flows down the water inlet branch pipe 5 to the bottom of the box 1.

[0031] In one possible implementation, a condensate pipe 15 communicating with the condensation chamber is installed at the bottom of the housing 1.

[0032] The condensate drain pipe 15 is used to drain the condensate temporarily stored at the bottom of the box 1.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A steam waste heat recovery device comprising a box (1), characterized in that: The box (1) is internally provided with a heat exchange cavity, a plurality of vertical partition plates (3) are vertically fixed in the heat exchange cavity to separate the heat exchange cavity into independent sealed pressurized chambers, the top of each pressurized chamber is communicated with an air inlet pipe (9) through an air inlet branch pipe (10), a one-way valve (11) and an air path valve (12) are installed on the air inlet branch pipe (10), the bottom of the pressurized chamber is provided with an exhaust pipe (13) for pressure relief, an S-shaped heat exchange pipe (6) is arranged in each pressurized chamber, the lower end of the heat exchange pipe (6) is communicated with a water inlet pipe (4), and the upper end of the heat exchange pipe (6) is communicated with a water outlet pipe (7); water path valves (8) are respectively installed at the two ends of the heat exchange pipe (6).

2. The apparatus according to claim 1, wherein: A horizontal partition plate (2) is sealingly fixed below the heat exchange cavity, the horizontal partition plate (2) separates the lower part in the box (1) into a condensation cavity, the exhaust pipe (13) is installed on the horizontal partition plate (2) and is used for discharging condensed water and steam in the heat exchange cavity into the condensation cavity, and an air path valve (12) is installed on the exhaust pipe (13).

3. The apparatus according to claim 2, wherein: The water inlet pipe (4) is communicated with the heat exchange pipe (6) through a water inlet branch pipe (5), and the water inlet branch pipe (5) is arranged in the condensation cavity and can be preheated by the discharged steam.

4. The apparatus according to claim 3, wherein: The exhaust pipe (13) is arranged in parallel with the water inlet branch pipe (5), and a plurality of exhaust ports (14) are installed on the side wall of the exhaust pipe (13) and are fixed towards the water inlet branch pipe (5).

5. The apparatus according to claim 1, wherein: A condensate pipe (15) is installed at the bottom of the box (1) and is communicated with the condensation cavity.

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