A kind of exhaust steam recovery device of boiler system

Abstract

The present invention discloses a boiler system exhaust steam recovery device, comprising: a vertical vault container, wherein the upper portion of the vertical vault container is provided with a water inlet, and the lower portion is provided with a water outlet; a spray system, wherein the spray system is arranged at the upper portion of the vertical vault container and is connected with the water inlet; a packing unit, wherein the packing unit is arranged below the spray system; and an exhaust steam inlet pipe, wherein the exhaust steam inlet pipe is arranged below the packing unit. The present application has a novel structure and strong practicality. It has significant effects and functions such as improving exhaust steam treatment efficiency, reducing environmental pollution, improving energy utilization, and intelligent control, and has broad application prospects and economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of boiler system exhaust steam treatment, and more particularly to a boiler system exhaust steam recovery device. Background Art

[0002] The cigarette industry is an industry with high requirements for energy and environment. The boiler system, as an important energy supply equipment in cigarette production, plays a vital role in the production process. However, during the operation of the boiler system, a large amount of exhaust steam is generated, which is usually regarded as waste steam and directly discharged into the atmosphere, which not only leads to energy waste, but also brings certain pollution to the environment.

[0003] At present, there are several main problems in the treatment of exhaust steam in boiler systems in the tobacco industry:

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

[0005] Environmental pollution: Exhaust gas contains a large amount of water vapor and harmful gases. Directly emitting it into the atmosphere will pollute the surrounding environment and affect the lives and health of surrounding residents. Especially for cigarette factories located around cities, large amounts of exhaust gas emissions may cause local environmental pollution and air quality problems.

[0006] In order to solve the above problems, researchers have proposed a series of technical solutions and device designs, mainly including the use of various physical principles to realize the recovery and utilization of water vapor in exhaust steam, and improving the structure and control methods of traditional exhaust steam treatment equipment. For example, using condensers and evaporators to condense and evaporate water vapor in exhaust 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 liquid-temperature joint control program to optimize the exhaust steam treatment process and improve energy efficiency, etc.

[0007] However, the existing technology still has some shortcomings. For example, although the steam heating plate heat exchange principle, flash evaporator and intermediate medium heat exchanger can partially recover the water vapor in the exhaust steam, there are problems of energy waste and environmental pollution, and it is impossible to completely recover the water vapor in the exhaust steam. Summary of the invention

[0008] The purpose of the present invention is to provide a boiler system exhaust steam recovery device to solve the technical problems existing in the background technology.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A boiler system exhaust steam recovery device, comprising:

[0011] A vertical vaulted container, wherein the vertical vaulted container is provided with a water inlet at the top and a water outlet at the bottom;

[0012] A spray system, the spray system is arranged in the upper part of the vertical vault container and is connected with the water inlet;

[0013] A packing unit, wherein the packing unit is arranged below the spray system;

[0014] An exhaust steam inlet pipe is arranged below the packing unit.

[0015] In some embodiments, the spray system includes a first-level water distribution pipe of a spray plate, a second-level water distribution pipe of a spray plate and a spray tube plate, the first-level water distribution pipe of the spray plate is connected to the water inlet, the second-level water distribution pipe of the spray plate is connected to the first-level water distribution pipe of the spray plate, the second-level water distribution pipe of the spray plate is connected to the spray tube plate, the spray tube plate includes a plurality of spray pipes, each of which is connected to the second-level water distribution pipe of the spray plate; a plurality of spray holes are arranged under each spray pipe.

[0016] In some embodiments, the first-level water distribution pipe of the spray plate and the second-level water distribution pipe of the spray plate are arranged side by side up and down, and the first-level water distribution pipe of the spray plate and the second-level water distribution pipe of the spray plate are connected by a number of water pipes, and the cavity volume of the first-level water distribution pipe of the spray plate is larger than the cavity volume of the second-level water distribution pipe of the spray plate; the water inflow of the second-level water distribution pipe of the spray plate is greater than the water outflow.

[0017] In some embodiments, a plurality of spray pipes form a circle, and the secondary water distribution pipe of the spray plate is arranged on the axial symmetry line of the plurality of spray pipes.

[0018] In some embodiments, a plurality of spray pipes are arranged at equal intervals.

[0019] In some embodiments, the packing unit includes a grid-type packing support plate and a packing, wherein the grid-type packing support plate is fixed on the inner wall of the vertical vault container, and the packing is fixed on the grid-type packing support plate, and the packing is an S-wave packing or an obliquely staggered packing.

[0020] In some embodiments, the exhaust steam inlet pipe is arranged tangentially along the circular inner wall of the vertical dome container, and the inlet size is reduced.

[0021] In some embodiments, a liquid level gauge is provided at the bottom of the vertical vault container.

[0022] In some embodiments, the lower water outlet is provided with a water collection tank, one side of the water collection tank is connected to a gravity-flow priority supply interface, the other side is connected to a return water system, and a sewage outlet is provided at the bottom of the water collection tank.

[0023] In some embodiments, the return water system includes a return water pump interface, a gate valve, a filter, a water pump, and a check valve connected in sequence.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The invention has novel structure and strong practicability, and has significant effects and functions such as improving exhaust steam treatment efficiency, reducing environmental pollution, improving energy utilization rate and intelligent control, and has broad application prospects and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a boiler system exhaust steam recovery device;

[0027] Figure 2 and Figure 3 Schematic diagram of the structure of the boiler system exhaust steam recovery device from different perspectives.

[0028] Illustration: 1-water inlet, 2-drain port, 3-vertical dome container, 4-exhaust steam inlet pipe, 5-gravity priority supply interface, 6-lower inspection door, 7-recycling water pump interface, 8-gate valve, 9-filter, 10-water pump, 11-check valve, 13-liquid level gauge, 14-upper inspection door, 15-drain port, 16-water collection tank, 17-grid type filler support plate, 18-filler, 19-spray tube plate, 20-spray plate secondary water distribution pipe, 21-spray plate primary water distribution pipe, 22-temperature sensor. DETAILED DESCRIPTION

[0029] In order to make the purpose, 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 in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0030] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0034] The following will be combined Figure 1-Figure 3 , a boiler system exhaust steam recovery device involved in the embodiment of the present application is described in detail. It is worth noting that the following embodiments are only used to explain the present application and do not constitute a limitation on the present application.

[0035] Embodiment 1:

[0036] like Figure 1-3 As shown, a boiler system exhaust steam recovery device includes: a vertical arch container 3, a spray system, a packing unit 18, and an exhaust steam inlet pipe 4. The vertical arch container 3 is provided with a water inlet 1 at the upper part and a water outlet at the lower part; the spray system is arranged at the upper part of the vertical arch container 3 and is connected with the water inlet 1; the packing unit 18 is arranged below the spray system; and the exhaust steam inlet pipe 4 is arranged below the packing unit 18.

[0037] See also Figure 2The spray system includes a spray plate primary water distribution pipe 21, a spray plate secondary water distribution pipe 20 and a spray tube 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 tube plate 19, and the spray tube plate 19 includes a plurality of spray pipes, each of which is connected to the spray plate secondary water distribution pipe 20; a plurality of spray holes are arranged under each spray pipe.

[0038] In some embodiments, the first-level water distribution pipe 21 of the spray plate and the second-level water distribution pipe 20 of the spray plate are arranged side by side up and down, and the first-level water distribution pipe 21 of the spray plate and the second-level water distribution pipe 20 of the spray plate are connected by a number of water pipes, and the cavity volume of the first-level water distribution pipe 21 of the spray plate is larger than the cavity volume of the second-level water distribution pipe 20 of the spray plate; the water inflow of the second-level water distribution pipe 20 of the spray plate is greater than the water outflow.

[0039] The water inlet 1 enters the container from the top of the vertical arch container 3 and is connected to the primary water distribution pipe 21 of the spray plate. The primary water distribution pipe 21 of the spray plate is connected to the secondary water distribution pipe 20 of the spray plate through a multi-way water pipe. The secondary water distribution pipe 20 of the spray plate is connected to a multi-way spray pipe to form a spray pipe plate 19. The primary water distribution pipe 21 of the spray plate, the secondary water distribution pipe 20 of the spray plate and the spray pipe plate 19 together constitute a spray system. The entire system is fixedly connected through the top connecting plate of the vertical arch container 3 and the connecting plate set in the middle of the water inlet 1. The soft water tank supplies soft water to enter the primary water distribution pipe and the secondary water distribution pipe through the water inlet 1 to achieve hydraulic balance in the pipe and enter the spray pipe plate 19. The spray pipe plate 19 is evenly distributed with spray holes and is located above the filler 18 to achieve uniform spraying.

[0040] In some embodiments, a plurality of spray pipes form a circle, and the spray plate secondary water distribution pipe 20 is arranged on the axisymmetric line of the plurality of spray pipes. The plurality of spray pipes are arranged at equal intervals. The spray pipes form a circle that just fits the inner wall of the vertical vault container 3, and the sprayed water can better cover the entire space and can better contact the exhaust steam.

[0041] In some embodiments, the packing 18 unit includes a grid-type packing 18 support plate 17 and a packing 18, wherein the grid-type packing 18 support plate 17 is fixed on the inner wall of the vertical vault container 3, and the packing 18 is fixed on the grid-type packing 18 support plate 17, and the packing 18 is an S-wave packing 18 or an oblique 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. 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.

[0042] The main function of the packing 18 is to facilitate the steam in the exhaust steam to pass through the support plate 17 of the grid-type packing 18. After the exhaust steam is fully in contact with the spray water for heat exchange and condensation, the condensate and the spray water mixture falls from the support plate 17 of the grid-type packing 18, so that the harmful substances in the exhaust steam can be fully recovered and processed in the form of liquid.

[0043] Specifically, a stainless steel perforated plate corrugated packing 18 and a grid type packing 18 support plate 17 may be arranged in the vertical dome container 3 to increase the contact area of ​​the liquid water and stabilize the packing 18 layer.

[0044] A more preferred technical solution is that the exhaust steam inlet pipe 4 is arranged tangentially along the circular inner wall of the vertical dome container 3, and the inlet size is reduced. The reduced inlet size allows the exhaust steam inlet to be pressurized and enter along the tangential circumference of the container inner wall. Some water droplets in the exhaust steam adhere to and flow down along the inner wall of the container, achieving preliminary steam-water separation. No other structures are added, and only the position and angle of the exhaust steam inlet are changed to achieve a very large effect. The realization of preliminary steam-water separation will have a good boosting effect on subsequent condensation.

[0045] In some embodiments, the lower water outlet is provided with a water collecting tank 16, and the mixture of condensate and spray water falls from the grid-type filler 18 support plate 17 and collects in the water collecting tank 16 at the bottom of the vertical vault container 3. The non-condensable gas in the exhaust steam is discharged through the drain port 2 at the top of the vertical vault container 3. The lower part of the vertical vault container 3 is a water storage chamber for storing the mixed liquid, and a liquid level meter 13 is provided to detect the liquid level.

[0046] The vertical dome container 3 is provided with an upper inspection door 14 for inspection of the spray and filler 18, and a lower inspection door 6 for inspection of the lower part.

[0047] In some embodiments, one side of the water collection tank 16 is connected to a gravity-flow priority supply interface 5, and the other side is connected to a return water system, and a sewage outlet 15 is provided at the bottom of the water collection tank 16. The return water system includes a reuse water pump 10 interface 7, a gate valve 8, a filter 9, a water pump 10, and a check valve 11 connected in sequence.

[0048] The water collection tank 16 is provided with a temperature sensor 22 to detect the temperature of the condensate. The water collection tank 16 is provided with a gravity self-flow priority supply interface 5 to directly supply the condensate to the deaerator, and is provided with a reuse water pump 10 interface 7. When the water level reaches the high liquid level setting through the liquid level meter 13, or the temperature sensor 22 detects that the water temperature is too low and the water level reaches a certain value, the return water pump 10 system starts to pump water to the soft water tank for reuse. A sewage outlet 15 is provided at the bottom of the water collection tank 16 for maintenance and sewage discharge, and is sealed with a plug for normal operation.

[0049] The water pump 10 system is composed of a gate valve 8, a filter 9, a water pump 10, a check valve 11 and a gate valve 8. The water pump 10 is connected to the reuse 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 and reuses it.

[0050] The specific implementation principle is as follows:

[0051] 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 disabled mode is the stop supply mode. The level gauge detection value is divided into four control points, including low limit water level < low water level < medium water level < high water level.

[0052] 1) When the level gauge detection value is less than or equal to the lower limit water level, the PLC controller sets the disable mode, disables control mode ① and control mode ②, resets and stops the water pump, and stops the valve on the gravity priority supply interface pipe.

[0053] 2) When the deaerator has a demand signal and the level gauge detection value is greater than the low water level and less than the high water level, and the temperature sensor detection value is greater than or equal to the set value (such as 60°C), the PLC controller connects to control mode ①, resets control mode ② and disable mode. In control mode ①, the valve on the gravity self-flow priority supply interface pipe will be opened, the water pump will be reset and stopped, and the high-temperature condensate will be supplied to the deaerator.

[0054] 3) When the liquid level meter detection value reaches the high water level, or the water level is greater than the low water level and the temperature sensor detection value is less than the set value (such as 60°C), or the liquid level meter detection value is greater than the low water level and there is no demand signal from the deaerator, the PLC controller sets control mode ②, and prohibits control mode ① and reset disable mode. In control mode ②, the valve on the gravity self-flow priority supply interface pipe will be closed. When the liquid level meter detection value is greater than or equal to the high water level, the water pump is set to run and enter PID control to pump the condensate to the soft water tank.

[0055] 4) In control mode ②, when there is a demand signal from the deaerator, and the detection value of the liquid level gauge is less than or equal to the middle water level and greater than the low water level, and the detection value of the temperature sensor is greater than the set value (such as 60°C), control mode ② will be reset and control mode ① will be released at the same time. The program will follow step "2)" to resume the execution of control mode ①.

[0056] Through the above control process, different demands for exhaust steam condensate can be met, and the liquid level in the device can be reduced in time to prevent the liquid level from being too high. The control point is set in a hysteresis mode to prevent the fluctuation of the liquid level detection point from causing frequent start and stop of the water pump and valve, thereby achieving correct function.

[0057] PID regulation process of the water pump in control mode ②:

[0058] When there is no demand signal from the deaerator and the temperature is greater than the set value (such as 60℃), the pid set value (SP value) is automatically assigned to a value slightly below the middle water level. The water pump maintains the water level slightly below the middle water level through pid control, waiting for the demand signal to reset control mode ② and prepare to enter control mode ①.

[0059] In other cases, the set value (SP value) of pid is automatically assigned to a value slightly lower than the lower limit water level. Since control mode ② starts the water pump at a high water level, the error between the set value and the actual value is large. pid will speed up the operation frequency of the water pump to quickly drop the water level. When there is a deaerator demand signal, the control mode can be converted to control mode ① in time 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 lower limit water level is reached. Optimal utilization of exhaust steam condensate can be achieved through pid control.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A boiler system exhaust steam recovery device, characterized in that: include: A vertical vaulted container, wherein the vertical vaulted container is provided with a water inlet at the top and a water outlet at the bottom; A spray system, the spray system is arranged in the upper part of the vertical vault container and is connected with the water inlet; A packing unit, wherein the packing unit is arranged below the spray system; An exhaust steam inlet pipe is arranged below the packing unit.

2. A boiler system exhaust steam recovery device according to claim 1, characterized in that: The spray system includes a first-level water distribution pipe of a spray plate, a second-level water distribution pipe of a spray plate and a spray tube plate. The first-level water distribution pipe of the spray plate is connected to the water inlet, the second-level water distribution pipe of the spray plate is connected to the first-level water distribution pipe of the spray plate, the second-level water distribution pipe of the spray plate is connected to the spray tube plate, and the spray tube plate includes a plurality of spray pipes, each of which is connected to the second-level water distribution pipe of the spray plate; a plurality of spray holes are provided under each spray pipe.

3. A boiler system exhaust steam recovery device according to claim 2, characterized in that: The first-level water distribution pipe of the spray plate and the second-level water distribution pipe of the spray plate are arranged side by side up and down, and are connected by a number of water pipes. The cavity volume of the first-level water distribution pipe of the spray plate is larger than the cavity volume of the second-level water distribution pipe of the spray plate; the water inflow of the second-level water distribution pipe of the spray plate is greater than the water outflow.

4. A boiler system exhaust steam recovery device according to claim 2, characterized in that: A plurality of spray pipes form a circle, and the secondary water distribution pipe of the spray plate is arranged on the axial symmetry line of the plurality of spray pipes.

5. The boiler system exhaust steam recovery device according to claim 2, characterized in that: Several sprinkler pipes are arranged at equal intervals.

6. A boiler system exhaust steam recovery device according to any one of claims 1 to 5, characterized in that: The packing unit comprises a grid-type packing support plate and packing, wherein the grid-type packing support plate is fixed on the inner wall of the vertical vault container, and the packing is fixed on the grid-type packing support plate, and the packing is an S-wave packing or an obliquely staggered packing.

7. The boiler system exhaust steam recovery device according to claim 1, characterized in that: The exhaust steam inlet pipe is arranged tangentially along the circular inner wall of the vertical dome container, and the inlet size is reduced.

8. The boiler system exhaust steam recovery device according to claim 1, characterized in that: A liquid level gauge is provided at the lower part of the vertical arch container.

9. The boiler system exhaust steam recovery device according to claim 1, characterized in that: The lower water outlet is provided with a water collecting tank, one side of the water collecting tank is connected to a gravity self-flow priority supply interface, the other side is connected to a return water system, and a sewage outlet is provided at the bottom of the water collecting tank.

10. The boiler system exhaust steam recovery device according to claim 9, characterized in that: The water return system comprises a water return pump interface, a gate valve, a filter, a water pump and a check valve which are connected in sequence.

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