Dead steam inlet structure for boiler system dead steam recovery device

Abstract

The utility model discloses a spray unit for a boiler system dead steam recovery device, which comprises a vertical vault container, a water inlet, a water outlet, a spray pipe, a spray pipe, a spray pipe, a spray pipe and a spray pipe, and is characterized in that the upper part of the vertical vault container is provided with a water inlet; the vertical vault container is provided with a circular inner wall; and the dead steam inlet pipe is arranged on the side wall of the vertical vault container and is tangentially arranged along the circular inner wall of the vertical vault container. The device is novel in structure and high in practicability. By applying the dead steam inlet structure, the inlet size of the dead steam inlet pipe is reduced, so that the dead steam inlet is pressurized and enters along the tangential circumference of the inner wall of the container, some water drops in the dead steam are attached along the inner wall of the container and flow down, primary steam-water separation is realized, and no other structures are added; a great effect can be achieved only by changing the position and the angle of the dead steam inlet, and a good boosting effect on subsequent condensation can be achieved through primary steam-water separation.

Description

Technical Field

[0001] The utility model relates to the technical field of waste steam treatment in boiler systems, and more specifically, to a waste steam inlet structure for a waste steam recovery device in a boiler system. Background Art

[0002] The cigarette industry is an industry with relatively high requirements for energy and the environment. Among them, the boiler system, as an important energy supply device in cigarette production, plays a crucial role in the production process. However, during the operation of the boiler system, a large amount of waste steam is generated, which is usually directly discharged into the atmosphere as waste water vapor. This not only causes energy waste but also brings certain pollution to the environment.

[0003] Currently, there are the following main problems in the treatment of waste steam in the boiler system of the cigarette industry:

[0004] Energy waste: In traditional waste steam treatment methods, waste steam is usually directly discharged into the atmosphere, and the heat energy and water vapor resources carried in it are not effectively utilized, resulting in energy waste. In the process of cigarette production, a large amount of heat energy is required to heat tobacco leaves and dry raw materials. Therefore, the failure to effectively recover the heat energy resources in waste steam means a waste of energy resources.

[0005] Environmental pollution: Waste steam contains a large amount of water vapor and harmful gases. Direct discharge into the atmosphere will pollute the surrounding environment and affect the lives and health of surrounding residents. Especially for cigarette factories located near cities, a large amount of waste gas emissions may cause local environmental pollution and air quality problems.

[0006] To solve the above problems, researchers have proposed a series of technical solutions and device designs, mainly including using various physical principles to realize the recovery and utilization of water vapor in waste steam, and improving the structure and control methods of traditional waste steam treatment equipment. For example, using condensers and evaporators to condense and evaporate the water vapor in waste steam, and then using separation equipment to separate liquid water and steam; using molecular sieve or membrane separation technology to achieve efficient separation of water vapor; using a liquid-temperature combined control program to optimize the waste steam treatment process and improve energy utilization efficiency, etc.

[0007] However, there are still some deficiencies in the existing technology. For example, the waste steam does not undergo preliminary condensation treatment after entering the vertical arch-top container, resulting in poor subsequent condensation treatment effect with cooling water. Summary of the Utility Model

[0008] The purpose of the utility model is to provide a waste steam inlet structure for a waste steam recovery device in a boiler system, in order to solve the technical problems existing in the background art.

[0009] To achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A steam inlet structure for a waste steam recovery device of a boiler system, comprising:

[0011] A vertical arch-top container, with a water inlet at the upper part and a water outlet at the lower part of the vertical arch-top container; the vertical arch-top container has a circular inner wall;

[0012] A waste steam inlet pipe, which is arranged on the side wall of the vertical arch-top container and is arranged tangentially along the circular inner wall of the vertical arch-top container.

[0013] In some embodiments, there are two waste steam inlet pipes, and the two waste steam inlet pipes are arranged side by side vertically.

[0014] In some embodiments, the outlet at one end of the waste steam inlet pipe inside the vertical arch-top container is beveled.

[0015] In some embodiments, the diameter of the waste steam inlet pipe gradually decreases from the outside of the vertical arch-top container towards the inside of the vertical arch-top container.

[0016] In some embodiments, the connecting end of the waste steam inlet pipe has a flange connection disc.

[0017] The beneficial effects of the present utility model compared with the prior art are:

[0018] The structure of this application is novel and highly practical. By applying the waste steam inlet structure of this application, since the inlet size of the waste steam inlet pipe is reduced, the pressure of the waste steam inlet is increased, and it enters tangentially along the inner wall of the container in a circular manner. Some water droplets in the waste steam adhere to and flow down along the inner wall of the container, achieving preliminary steam-water separation. Without adding any other structures, simply changing the position and angle of the waste steam inlet can achieve a very good effect. Achieving preliminary steam-water separation will play a very good boosting effect on subsequent condensation. Description of the Drawings

[0019] Figure 1 Is a schematic diagram of a waste steam recovery device for a boiler system;

[0020] Figure 2 And Figure 3 Are schematic structural diagrams of a waste steam recovery device for a boiler system from different perspectives;

[0021] Figure 4 Is a schematic diagram of a spray hole;

[0022] Figure 5 Is a schematic diagram of the waste steam inlet structure.

[0023] Illustration: 1 - water inlet, 2 - drain port, 3 - vertical dome container, 4 - exhaust steam inlet pipe, 5 - gravity flow priority supply interface, 6 - lower maintenance door, 7 - reclaimed water pump interface, 8 - gate valve, 9 - filter, 10 - water pump, 11 - check valve, 13 - liquid level gauge, 12 - spray hole, 14 - upper maintenance door, 15 - sewage outlet, 16 - water collection tank, 17 - grid-type packing support plate, 18 - packing, 19 - spray pipe plate, 20 - secondary water distribution pipe of spray plate, 21 - primary water distribution pipe of spray plate, 22 - temperature sensor, 23 - flange connection disc. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The described embodiments are some but not all of the embodiments of the present application. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as a limitation to the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0025] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0026] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection or an indirect connection through an intermediate medium. It can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0027] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0028] In addition, the terms "comprising", "having", and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or display that comprises a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or displays.

[0029] The following will be combined with Figures 1 - 5 , and a spray unit for a waste steam recovery device of a boiler system according to an embodiment of the present application will be described in detail. It should be noted that the following embodiments are only used to explain the present application and do not constitute a limitation to the present application. In order to more clearly describe the structure and working principle of the spray unit, it will be applied to a waste steam recovery device of a boiler system for detailed description below.

[0030] Embodiment 1:

[0031] As Figures 1 - 5 shown, a waste steam recovery device of a boiler system includes: a vertical vault container 3, a spray system, a packing 18 unit, a waste steam inlet pipe 4. The upper part of the vertical vault container 3 is provided with a water inlet 1, and the lower part is provided with a water outlet; the vertical vault container 3 has a circular inner wall; the spray system is arranged in the upper part of the vertical vault container 3 and is communicated with the water inlet 1; the packing 18 unit is arranged below the spray system; the waste steam inlet pipe 4 is arranged below the packing 18 unit.

[0032] Referring to Figure 2 , the spray system includes a spray plate primary water distribution pipe 21, a spray plate secondary water distribution pipe 20, and a spray pipe plate 19. The spray plate primary water distribution pipe 21 is connected to the water inlet 1, the spray plate secondary water distribution pipe 20 is connected to the spray plate primary water distribution pipe 21, the spray plate secondary water distribution pipe 20 is connected to the spray pipe plate 19, the spray pipe plate 19 includes a plurality of spray pipes, and each spray pipe is communicated with the spray plate secondary water distribution pipe 20; a plurality of spray holes are arranged below each spray pipe.

[0033] In some embodiments, the spray plate primary water distribution pipe 21 and the spray plate secondary water distribution pipe 20 are arranged side by side up and down, and the spray plate primary water distribution pipe 21 and the spray plate secondary water distribution pipe 20 are communicated through a plurality of water delivery pipes. The cavity volume of the spray plate primary water distribution pipe 21 is larger than the cavity volume of the spray plate secondary water distribution pipe 20; the water inflow volume of the spray plate secondary water distribution pipe 20 is larger than the water outflow volume.

[0034] The water inlet 1 enters the interior of the vertical arch-top container 3 from the top and is connected to the first-stage water distribution pipe 21 of the spray plate. The first-stage water distribution pipe 21 of the spray plate is connected to the second-stage water distribution pipe 20 of the spray plate through multiple water delivery pipes. Multiple spray pipes are connected to the second-stage water distribution pipe 20 of the spray plate to form a spray pipe plate 19. The first-stage water distribution pipe 21 of the spray plate, the second-stage water distribution pipe 20 of the spray plate, and the spray pipe plate 19 together form a spray system. The entire system is fixedly connected through the top connection plate of the vertical arch-top container 3 and the connection plate provided in the middle of the water inlet 1. The soft water tank supplies soft water, which enters the first-stage water distribution pipe and the second-stage water distribution pipe through the water inlet 1 to achieve hydraulic balance inside the pipes and then enters the spray pipe plate 19. The spray pipe plate 19 is evenly distributed with spray holes and is located above the packing 18 to achieve uniform spraying.

[0035] In some embodiments, several spray pipes form a circle, and the second-stage water distribution pipe 20 of the spray plate is arranged on the axis of symmetry of several spray pipes. The several spray pipes are arranged at equal intervals. The circle formed by the spray pipes just fits the inner wall of the vertical arch-top container 3, and the sprayed water can better cover the entire space and better contact the waste steam.

[0036] Furthermore, the spray holes provided below each spray pipe are arranged at different angles. This is convenient for covering the waste steam more comprehensively, better contacting the waste steam, and improving the quality and efficiency of waste steam treatment.

[0037] In some embodiments, the packing 18 unit includes a grid-type packing 18 support plate 17 and the packing 18. The grid-type packing 18 support plate 17 is fixed on the inner wall of the vertical arch-top container 3, and the packing 18 is fixed on the grid-type packing 18 support plate 17. The packing 18 is an S-wave packing 18 or a staggered packing 18. The plastic packing 18 is usually made of materials such as polypropylene (PP) and polyethylene (PE), and has good corrosion resistance, wear resistance, and light weight characteristics. The plastic packing 18 has good heat exchange performance, can provide a large contact area and good water flow distribution, thereby improving the cooling effect.

[0038] The main function of the packing 18 is to facilitate the steam in the waste steam to pass through the grid-type packing 18 support plate 17. After the waste steam is fully contacted and heat-exchanged with the spray water in the packing 18 and condensed, the condensate and the spray water mixture fall from the grid-type packing 18 support plate 17, so that the harmful substances in the waste steam are fully recovered and treated in the form of liquid.

[0039] Specifically, stainless steel perforated plate corrugated packing 18 and grid-type packing 18 support plates 17 can be arranged in the vertical arch-top container 3 to increase the contact area of liquid water and stabilize the packing 18 layer.

[0040] A more preferred technical solution is that the exhaust steam inlet pipe 4 is arranged tangentially along the circular inner wall of the vertical arch-top container 3, and the inlet size is reduced; the connecting end of the exhaust steam inlet pipe 4 has a flange connection disc. The outlet of one end of the exhaust steam inlet pipe 4 inside the vertical arch-top container 3 is beveled; the reduction of the inlet size increases the pressure of the exhaust steam inlet, and the beveled outlet enables it to enter tangentially along the inner wall of the container in a circular motion. Some water droplets in the exhaust steam adhere to and flow down along the inner wall of the container, achieving preliminary steam-water separation. Without adding any other structures, simply changing the position and angle of the exhaust steam inlet can achieve a very good effect. Achieving preliminary steam-water separation will play a very good boosting effect on subsequent condensation.

[0041] In some embodiments, a water collecting tank 16 is provided at the lower water outlet. The condensate and spray water mixture falls from the support plate 17 of the grid-type packing 18 and is collected in the water collecting tank 16 at the bottom of the vertical arch-top container 3. The non-condensable gas in the exhaust steam is discharged through the exhaust port 2 at the top of the vertical arch-top container 3. The lower part of the vertical arch-top container 3 is a water storage chamber for storing the mixture, and a liquid level gauge 13 is provided to detect the liquid level.

[0042] The vertical arch-top container 3 is provided with an upper inspection door 14 for inspecting the spray and packing 18, and a lower inspection door 6 for inspecting the lower part.

[0043] In some embodiments, a gravity self-flow priority supply interface 5 is connected to one side of the water collecting tank 16, a return water system is connected to the other side, and a sewage discharge port 15 is provided at the bottom of the water collecting tank 16. The return water system includes a return water pump 10 interface 7, a gate valve 8, a filter 9, a water pump 10, and a check valve 11 connected in sequence.

[0044] The water collecting tank 16 is provided with a temperature sensor 22 for detecting the temperature of the condensate. The water collecting tank 16 is provided with a gravity self-flow priority supply interface 5 to directly supply the condensate to the deaerator, and a return water pump 10 interface 7. When the water level detected by the liquid level gauge 13 reaches the high-level setting, or the water temperature detected by the temperature sensor 22 is too low and the water level reaches a certain value, the return water pump 10 system starts to pump the water to the soft water tank for reuse. A sewage discharge port 15 is provided at the bottom of the water collecting tank 16 for maintenance sewage discharge, and is blocked by a plug during normal operation.

[0045] The water pump 10 system consists of a gate valve 8, a filter 9, a water pump 10, a check valve 11, and a gate valve 8, etc. It is connected to the return water pump 10 interface 7 through the gate valve 8, and the outlet is connected to the boiler soft water tank through the gate valve 8. The filter 9 filters the water for reuse.

[0046] The specific implementation principle is as follows:

[0047] There are three control modes, namely control mode ①, control mode ②, and disabled mode. Control mode ① is the supply mode to the deaerator, control mode ② is the supply mode to the soft water tank, and the disabled mode is the stop supply mode. The detection value of the liquid level gauge is divided into four control points, including the low limit water level < low water level < medium water level < high water level.

[0048] 1) When the detection value of the liquid level gauge is less than or equal to the low limit water level, the PLC controller sets the disabled mode, disables control mode ① and control mode ②, resets and stops the water pump, and stops the valve on the gravity flow priority supply interface pipeline.

[0049] 2) When there is a demand signal from the deaerator, the detection value of the liquid level gauge is greater than the low water level and less than the high water level, and at the same time the detection value of the temperature sensor is greater than or equal to the set value (such as 60 °C), the PLC controller turns on control mode ①, resets control mode ② and the disabled mode. In control mode ①, the valve on the gravity flow priority supply interface pipeline will be opened, the stop water pump will be reset, and the high-temperature condensate will be supplied to the deaerator.

[0050] 3) When the detection value of the liquid level gauge reaches the high water level, or the water level is greater than the low water level and the detection value of the temperature sensor is less than the set value (such as 60 °C), or the detection value of the liquid level gauge is greater than the low water level and there is no demand signal from the deaerator, the PLC controller sets control mode ②, and at the same time prohibits control mode ① and resets the disabled mode. In control mode ②, the valve on the gravity flow priority supply interface pipeline will be closed. When the detection value of the liquid level gauge is greater than or equal to the high water level, the water pump operation will be set, and PID control will be entered to pump the condensate water to the soft water tank.

[0051] 4) In control mode ②, when there is a demand signal from the deaerator, the detection value of the liquid level gauge is less than or equal to the medium water level and greater than the low water level, and at the same time the detection value of the temperature sensor is greater than the set value (such as 60 °C), control mode ② will be reset, and at the same time control mode ① will be released, and the program will execute according to step "2)", and the execution of control mode ① will be restored.

[0052] Through the above control process, different demands of the exhaust steam condensate can be realized, the liquid level in the device can be reduced in time to prevent the liquid level from being too high, and the control point is set in a dead band mode to prevent the frequent start and stop of the water pump and valve caused by the fluctuation of the liquid level detection point, so as to realize the correct function.

[0053] PID adjustment process of the water pump in control mode ②:

[0054] When there is no demand signal from the deaerator and the temperature is greater than the set value (such as 60 °C), the PID set value (SP value) is automatically assigned a value slightly lower than the medium water level. The water pump realizes maintaining the water level at a position slightly lower than the medium water level through PID control, waits for the demand signal to reset control mode ②, and is ready to enter control mode ①.

[0055] In other cases, the set value (SP value) of the PID is automatically assigned a value slightly lower than the low water level. Since control mode ② starts the water pump at a high water level, there is a large error value between the set value and the actual value. The PID will increase the operating frequency of the water pump, causing the water level to drop rapidly. When there is a demand signal for the deaerator, the control mode can be promptly switched to control mode ① to meet the water demand of the deaerator. If the water temperature is lower than the set value (such as 60 degrees), control mode ② will be maintained until the low water level is reached. Optimal utilization of exhaust steam condensate can be achieved through PID control.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A waste steam inlet structure for a waste steam recovery device of a boiler system, characterized in that Comprising: A vertical domed vessel, with a water inlet at the upper part and a water outlet at the lower part; the vertical domed vessel has a circular inner wall; An exhaust steam inlet pipe, which is arranged on the side wall of the vertical domed vessel and is tangentially arranged along the circular inner wall of the vertical domed vessel.

2. The steam inlet structure for a waste steam recovery device of a boiler system according to claim 1, characterized in that, There are two exhaust steam inlet pipes, and the two exhaust steam inlet pipes are arranged side by side vertically.

3. The steam inlet structure for the waste steam recovery device of a boiler system according to claim 1, characterized in that The outlet at one end of the exhaust steam inlet pipe inside the vertical domed vessel is beveled.

4. The steam inlet structure for the waste steam recovery device of a boiler system according to claim 1, characterized in that The diameter of the exhaust steam inlet pipe gradually decreases from the outside of the vertical domed vessel towards the inside of the vertical domed vessel.

5. The steam inlet structure for the waste steam recovery device of a boiler system according to claim 1, characterized in that, The connecting end of the exhaust steam inlet pipe has a flange connection disc.

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