Moisture removal wind pressure control device and method

Abstract

The invention relates to the field of air pressure control, in particular to a moisture removal air pressure control device and method.The moisture removal air pressure control device comprises an electric control air door module, a PLC and a pressure difference detection module, detection data are converted into analog signals through the pressure difference detection module and input into the PLC, the PLC converts the detection data, and the analog signals are sent to the electric control air door module; the opening degree of the air door is adjusted by the electric air door adjusting module controlled by the PLC, so that the moisture removal air pressure of the moisture removal air pipe is accurately controlled, the moisture removal air pressure range of the moisture removal air pipe meets the process requirement, and stable operation of equipment in each process is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of wind pressure control, and more specifically, to a dehumidification wind pressure control device and method. Background Art

[0002] The management of the dehumidification system in the silk-making workshop involves multiple process sections, such as the slicing line, stem line, leaf line, silk line, burley tobacco line, and ginseng line. Each process section has different dehumidification requirements during the production process. There are several key problems in the current system that need to be solved: First, when the production equipment is fully turned on, the dehumidification effect is not satisfactory due to the air volume and air pressure of the fan. Secondly, when some equipment is shut down, such as the stem line and burley tobacco line, the relevant dehumidification ducts cannot be closed, resulting in the overall dehumidification network remaining in full operation regardless of whether the equipment is fully turned on or not. This situation not only increases the energy consumption and operating costs of the equipment, but also reduces the efficiency and environmental adaptability of the equipment.

[0003] In addition, the dehumidification pipes in the prior art have serious water and dust blockage problems, and the dehumidification air ducts are designed to be fully sealed and opaque. Operators cannot directly observe the internal conditions of the pipes, making it difficult to detect and deal with blockages in a timely manner, which directly affects the operation effect and stability of the dehumidification system. Summary of the invention

[0004] In order to overcome at least one of the defects of the prior art described above, the present invention provides a dehumidification wind pressure control device and method.

[0005] The present invention aims to solve the above technical problems at least to a certain extent.

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0007] A dehumidification wind pressure control device is arranged in a dehumidification duct, comprising: a PLC controller, an electric adjustable damper module and a pressure difference detection module connected by the PLC controller, the electric adjustable damper module and the pressure difference detection module are both installed in the dehumidification duct, the electric adjustable damper module comprises a damper, and the damper is provided with an opening and closing stroke.

[0008] Furthermore, the electric adjustable damper module also includes a rotating shaft, the dampers are symmetrically arranged along the rotating shaft, and the dampers rotate around the rotating shaft.

[0009] Furthermore, the electric damper module further comprises: a valve electric structure and a bearing, wherein the valve electric structure is connected to the driving end of the rotating shaft, and the bearings are respectively sleeved on both ends of the rotating shaft.

[0010] Furthermore, the damper is fixedly connected to the rotating shaft via a plurality of fastening components.

[0011] Furthermore, the pressure difference detection module includes a static pressure contact and a total pressure contact, a total pressure hole is provided at one end of the total pressure contact, and a static pressure hole is provided at one end of the static pressure contact, the total pressure hole and the static pressure hole face in opposite directions, the total pressure hole faces away from the airflow direction, and the static pressure hole faces the airflow direction.

[0012] Furthermore, the pressure difference detection module also includes a temperature sensor, and the temperature sensor is provided at the connection between the static pressure contact and the total pressure contact.

[0013] A method for controlling the wind pressure of dehumidification is provided, and the method is applied to the dehumidification wind pressure control device, and comprises the following steps:

[0014] S1: The pressure difference detection module sends the detection data to the PLC controller;

[0015] S2: The PLC controller generates a corresponding control signal according to the detection data, and sends the control signal to the electric damper module. The electric damper module controls the opening and closing degree of the damper according to the control signal, thereby adjusting the negative pressure value in the dehumidification pipe.

[0016] Further, in step S1, the pressure difference detection module sends the detection data to the PLC controller, including:

[0017] The pressure difference detection module detects the negative pressure value in the dehumidification pipe. After the pressure difference detection module converts the negative pressure value in the dehumidification pipe into an analog signal, the analog signal is sent to the PLC controller.

[0018] Further, the PLC controller generates a corresponding control signal according to the detection data, and sends the control signal to the electric damper adjustment module, and the electric damper adjustment module controls the opening and closing degree of the damper according to the control signal, thereby adjusting the negative pressure value in the dehumidification pipe, including:

[0019] The PLC controller obtains the target opening and closing degree from a preset opening and closing degree curve. The PLC controller generates a corresponding control signal based on the detection data and the target opening and closing degree, and sends the control signal to the electric damper module. The electric damper module controls the damper to the target opening and closing degree according to the control signal, thereby adjusting the negative pressure value in the dehumidification duct.

[0020] Furthermore, the preset opening and closing degree curve includes:

[0021] Opening degree = (negative pressure value in the dehumidification pipe - B) / A

[0022] In the formula, A is the weight and B is the negative pressure value when the damper is closed.

[0023] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0024] The present invention includes a PLC controller, an electric damper module connected by the PLC controller, and a pressure difference detection module. The present invention converts detection data into analog signals through the pressure difference detection module and sends them into an analog input block. The detection data is converted into analog signals through the pressure difference detection module and input into the PLC controller. The PLC controller converts the detection data. The electric damper module controlled by the PLC controller adjusts the damper opening to achieve precise control of the dehumidification air pressure of the dehumidification air duct, so that the dehumidification air pressure range of the dehumidification air duct meets the process requirements, thereby ensuring the stable operation of equipment in each process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the dehumidification wind pressure control device of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the electric damper module of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the fastening device described in this embodiment;

[0028] Figure 4 It is a schematic structural diagram of the pressure difference detection device of the present invention;

[0029] In the figure, 1. PLC controller; 2. Electric damper module; 3. Pressure difference detection module; 4. Rotating shaft; 5. Damper; 6. Valve electric structure; 7. Bearing; 8. Static pressure contact; 9. Total pressure contact; 10. Temperature sensor. DETAILED DESCRIPTION

[0030] The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;

[0031] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0032] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0033] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Example 1

[0035] A dehumidification wind pressure control device, the dehumidification wind pressure control device is arranged in a dehumidification pipe, such as Figure 1 As shown, it includes: a PLC controller, an electric adjustable damper module and a pressure difference detection module connected by the PLC controller, the electric adjustable damper module and the pressure difference detection module are both installed in the moisture discharge duct, the electric adjustable damper module includes a damper, and the damper is provided with an opening and closing stroke.

[0036] During the specific implementation process, the present invention converts the detection data into electrical signals through the pressure difference detection module and inputs them into the PLC controller. The PLC controller converts and reads the data by calling the function, and adjusts the damper opening by analyzing the relationship between the damper opening and the negative pressure in the dehumidification duct. This achieves precise control of the dehumidification duct system, makes the dehumidification damper opening range of each process meet the process requirements, and ensures the stable operation of the equipment in each process.

[0037] Example 2

[0038] This embodiment further discloses the following contents based on the embodiment 1:

[0039] like Figure 2 As shown, the electric adjustable damper module also includes a rotating shaft, the dampers are symmetrically arranged along the rotating shaft, and the dampers rotate around the axis of the rotating shaft.

[0040] The electric damper module further comprises: a valve electric structure and a bearing. The valve electric structure is connected to the driving end of the rotating shaft, and the bearings are respectively sleeved on both ends of the rotating shaft.

[0041] During the specific implementation process, considering that the exhaust duct contains corrosive smoke and water vapor, the damper body is made of SUS304 material, the damper baffle moves frequently, and bearings are used on both sides. The bearings are UCFL205 outer spherical ball bearings with diamond seats.

[0042] like Figure 3 As shown, the damper is fixedly connected to the rotating shaft through a plurality of fastening components.

[0043] In a specific embodiment, the fastening components are selected from hexagonal bolts, springs, flat washers and anti-loosening nuts.

[0044] like Figure 4 As shown, the pressure difference detection module includes a static pressure contact and a total pressure contact, a total pressure hole is provided at one end of the total pressure contact, and a static pressure hole is provided at one end of the static pressure contact, the total pressure hole and the static pressure hole face in opposite directions, the total pressure hole faces away from the airflow direction, and the static pressure hole faces the airflow direction.

[0045] In the specific implementation process, a pressure difference detection device is added to the front side of the air damper on the pipeline at the equipment end, which can monitor the gas flow pressure in the pipeline in real time, predict the blockage of the pipeline in time, and adjust the opening of the air damper according to the pressure difference in the pipeline when necessary, so as to achieve energy saving and environmental protection. The detection element is made of two metal pipes with the same appearance welded and pressed into a static pressure hole. There are two cuts in opposite directions at the probe, and the cross-sections of the cuts are parallel to each other. The cut facing the direction of the airflow is the total pressure hole, and the cut facing the direction of the airflow is the static pressure hole. There is a metal temperature sensor on the side of the two metal pipes, and a metal casing tightly wraps them for protection.

[0046] In a specific embodiment, a non-contact Pitot tube is selected as the differential pressure detection module (3) because the dehumidification pipe contains smoke and water vapor, and a general contact type sensor is easily damaged by long-term contact with smoke and water vapor.

[0047] The pressure difference detection module further includes a temperature sensor, and the temperature sensor is provided at the connection between the static pressure contact and the total pressure contact.

[0048] In the specific implementation process, the non-contact pitot tube is mainly used to measure the total pressure and static pressure of the airflow, and then calculate the airflow speed through Bernoulli's theorem. In this process, although the pressure of the airflow is directly measured, there is also a certain relationship between the airflow speed and temperature. Especially in high-speed airflow, temperature changes may have a significant impact on the airflow speed measurement.

[0049] Correction of measurement errors: Due to the correlation between airflow velocity and temperature, the non-contact pitot tube may be disturbed by temperature changes when measuring airflow velocity. Setting a temperature sensor can monitor the temperature of the airflow or the surrounding environment in real time, thereby correcting the measurement results and improving the accuracy of the measurement.

[0050] Improve measurement accuracy: In situations where high-precision measurements are required, such as aerospace, meteorological observation, etc., small temperature changes may have a significant impact on the measurement results. Therefore, setting up a temperature sensor can further improve the measurement accuracy of the non-contact pitot tube.

[0051] Example 3

[0052] This embodiment further discloses the following contents based on Embodiments 1 and 2:

[0053] A method for controlling the wind pressure of dehumidification is provided, and the method is applied to the dehumidification wind pressure control device, and comprises the following steps:

[0054] S1: The pressure difference detection module 3 sends the detection data to the PLC controller 1;

[0055] S2: The PLC controller 1 generates a corresponding control signal according to the detection data, and sends the control signal to the electric damper module 2. The electric damper module 2 controls the opening and closing degree of the damper 5 according to the control signal, thereby adjusting the negative pressure value in the dehumidification pipe.

[0056] Step S1, the pressure difference detection module sends the detection data to the PLC controller, including:

[0057] The pressure difference detection module detects the negative pressure value in the dehumidification pipe. After the pressure difference detection module converts the negative pressure value in the dehumidification pipe into an analog signal, the analog signal is sent to the PLC controller.

[0058] In the specific implementation process, E+H PMD235 micro differential pressure transmitter is selected. The differential pressure acts on the isolation diaphragm of the diffused silicon sensor and is transmitted to the measuring element through the sealing liquid. The differential pressure causes the silicon diaphragm to produce a piezoresistive effect, thereby changing the resistance value of the diffused silicon. The electrical signal is converted into an electrical signal by the bridge and transmitted to the microprocessor for processing, and finally an analog and digital signal output proportional to the differential pressure is obtained.

[0059] Step S2, the PLC controller 1 generates a corresponding control signal according to the detection data, and sends the control signal to the electric damper module 2, and the electric damper module 2 controls the opening and closing degree of the damper 5 according to the control signal, thereby adjusting the negative pressure value in the dehumidification pipe, including:

[0060] The PLC controller 1 obtains the target opening and closing degree from the preset opening and closing degree curve. The PLC controller 1 generates a corresponding control signal according to the detection data and the target opening and closing degree, and sends the control signal to the electric adjustable damper module 2. The electric adjustable damper module 2 controls the damper 5 to the target opening and closing degree according to the control signal, thereby adjusting the negative pressure value in the dehumidification pipe.

[0061] The opening and closing degree curve includes:

[0062] Opening degree = (negative pressure value in the dehumidification pipe - B) / A

[0063] In the formula, A is the weight and B is the negative pressure value when the damper is closed.

[0064] The air volume detection system of the moisture exhaust duct can automatically control the damper in the range of 0-100%, automatically open when the equipment is running, and automatically close when the equipment is stopped, realizing the automation and convenience of operation. The pressure difference and damper opening of each pipeline can be displayed in real time to ensure the stability and safety of the system. The opening of the moisture exhaust damper is automatically adjusted according to the needs of each process, avoiding unnecessary energy waste and greatly reducing energy consumption.

[0065] In the specific implementation process, after the control of the entire dehumidification duct is basically realized, in order to better discuss the logical relationship between the damper opening and the negative pressure of the dehumidification duct, the blade charging HT dehumidification section is taken as an example for data collection. The basic data are shown in Table 1.

[0066] Table 1 Tidal discharge data

[0067]

[0068] The fitting equation is obtained by fitting the data in Table 1:

[0069] Negative pressure value = 0.51*throttle opening + 11.97.

[0070] In order to verify the logical relationship between the damper opening and the negative pressure of the moisture exhaust pipe, it is necessary to analyze and compare other opening data of this process. Table 2 is the verification data.

[0071] Table 2 Verification data

[0072]

[0073] According to the comparison in Table 2, the actual value is basically close to the theoretical value, and the fitting equation is suitable for the damper adjustment of the moisture exhaust duct in this section.

[0074] In the specific implementation process, after the entire dehumidification wind pressure control device is basically realized, it is necessary to calculate the pressure difference value in the pipeline. The known process indicators of the dehumidification pipeline are shown in Table 3, and the blade feeding HT dehumidification section is taken as an example for data collection and data calculation and analysis.

[0075] Table 3 φ300mm pipeline process conditions

[0076]

[0077]

[0078] Table 4 φ300mm pipeline working parameters

[0079] (1) Calculation of air volume

[0080] Air volume refers to the volume of air passing through a certain air duct section per unit time, usually in cubic meters per hour (m / h). Wind speed refers to the speed of air flowing in the air duct, usually in meters per second (m / s). The specific relationship between the two can be expressed by the following formula:

[0081] Air volume (Q) = A*v*t

[0082] (2) Calculation of wind pressure

[0083] According to the ideal gas state equation PV=nRT (where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature), the formula for calculating gas pressure is P=nRT / V. When the gas passes through the orifice plate through the pipeline, the flow rate will increase, and a pressure difference will be generated on both sides of the orifice plate. There is a constant relationship between the flow rate and the pressure difference. The flow rate of the gas in the pipeline can be calculated by the pressure difference.

[0084] (3) Relationship between air volume and wind speed

[0085] Assuming that the cross-sectional area of ​​the air duct remains unchanged, when the wind speed increases, the volume of air passing through the cross-section of the air duct will increase in the same period of time, thereby increasing the air volume; conversely, when the wind speed decreases, the air volume will also decrease accordingly.

[0086] The conversion formula for air volume and wind speed is: Q=3600fv Q represents air volume ( / h); f represents the cross-sectional area of ​​the air duct; v represents wind speed (m / s).

[0087] Or you can use the following specific formula to calculate according to the shape of the duct:

[0088] Circular air duct: air volume Q = 900πd 2 v, where d is the inner diameter of the duct (m), and v is the wind speed in the duct (m / s). Rectangular duct: air volume Q = 3600abv, where a and b are the net width and net height of the duct section (m), and v is the wind speed in the duct (m / s).

[0089] (4) Calculation of pressure difference

[0090] Assuming that the gas in the dehumidification pipe is an incompressible fluid and the flow is steady, the negative pressure can be estimated using the following formula:

[0091] △P=1 / 2ρv2

[0092] Where: △P is the negative pressure value (Pa); ρ is the density of the gas (kg / m); v is the flow rate of the gas in the pipeline (m / s).

[0093] However, this calculation method is a simplified situation. In the actual dehumidification pipe system, there may be elbows, branches, valves and other components, which will affect the negative pressure and make the calculation complicated. Different dehumidification pipe parameters and process indicators are different. In order to meet the dehumidification requirements of each process, it is necessary to combine the above formula, (Q) = A*v*t = qv = V / t,

[0094] qv=792.116*A*Wp*Fv*e*(△P / p)c0.5 / h

[0095] The pressure difference calculation formula can be obtained:

[0096] △P=792.116*A*Wp*Fv*e / (qv)2=792.116*A*Wp*Fv*e / Q2

[0097] The relationship between the pressure difference in the pipeline and the wind speed, air volume, air volume per unit time and pipeline diameter can be obtained through the formula. Taking the feeding section HD as an example, the negative pressure value per unit time during normal production is calculated:

[0098] According to the formula: △P = 792.116*A*Wp*Fv*e / (A*v*t)2

[0099] Calculation shows that: △P = 792.116*0.07069*0.75648*1.2723*2.00 / (0.07069*20.5*1)2 = 51.65Pa.

[0100] It can be seen from the calculation that the pressure difference required for normal moisture discharge in this section is 51.65Pa. The calculation method for other sections is the same as above, and it provides theoretical support for the subsequent calculation of the relationship between the pressure difference and the opening of the moisture discharge damper.

[0101] The same or similar reference numerals correspond to the same or similar components;

[0102] The terms used in the drawings to describe positional relationships are only used for illustrative purposes and should not be construed as limiting this patent;

[0103] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. 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 claims of the present invention.

Claims

1. A dehumidification wind pressure control device, the dehumidification wind pressure control device is arranged in a dehumidification pipe, It is characterized in that include: A PLC controller (1), an electric damper module (2) and a pressure difference detection module (3) connected by the PLC controller (1), wherein the electric damper module (2) and the pressure difference detection module (3) are both installed in a moisture discharge pipe, and the electric damper module (2) comprises a damper (5), and the damper (5) is provided with an opening and closing stroke.

2. The dehumidification wind pressure control device according to claim 1, It is characterized in that The electric damper module (2) further comprises a rotating shaft (4), the dampers (5) are symmetrically arranged along the rotating shaft (4), and the dampers (5) rotate around the axis of the rotating shaft (4).

3. The dehumidification wind pressure control device according to claim 2, It is characterized in that The electric damper module (2) further comprises: a valve electric structure (6) and a bearing (7); the valve electric structure (6) is connected to the driving end of the rotating shaft (4); and the bearing (7) is respectively sleeved on both ends of the rotating shaft (4).

4. The dehumidification wind pressure control device according to claim 3, It is characterized in that The damper (5) is fixedly connected to the rotating shaft (4) via a plurality of fastening components.

5. The dehumidification wind pressure control device according to claim 1, It is characterized in that The pressure difference detection module (3) comprises a static pressure contact (8) and a total pressure contact (9), one end of the total pressure contact (9) is provided with a total pressure hole, and one end of the static pressure contact (8) is provided with a static pressure hole, the total pressure hole and the static pressure hole face in opposite directions, the total pressure hole faces away from the airflow direction, and the static pressure hole faces the airflow direction.

6. The dehumidification wind pressure control device according to claim 5, It is characterized in that The differential pressure detection module (3) further comprises a temperature sensor (10), and the temperature sensor (10) is arranged at the connection between the static pressure contact and the total pressure contact.

7. A method for controlling wind pressure during dehumidification. It is characterized in that The control method is applied to the dehumidification wind pressure control device according to any one of claims 1 to 6, comprising the following steps: S1: the pressure difference detection module (3) sends the detection data to the PLC controller (1); S2: The PLC controller (1) generates a corresponding control signal according to the detection data, and sends the control signal to the electric damper module (2). The electric damper module (2) controls the opening and closing degree of the damper (5) according to the control signal, thereby adjusting the negative pressure value in the dehumidification pipe.

8. The method for controlling dehumidification wind pressure according to claim 7, It is characterized in that Step S1, the pressure difference detection module (3) sends the detection data to the PLC controller (1), including: The pressure difference detection module (3) detects the negative pressure value in the dehumidification pipe, and after converting the negative pressure value in the dehumidification pipe into an analog signal, the pressure difference detection module (3) sends the analog signal to the PLC controller (1).

9. The method for controlling moisture removal wind pressure according to claim 8, It is characterized in that Step S2, the PLC controller (1) generates a corresponding control signal according to the detection data, and sends the control signal to the electric damper adjustment module (2), and the electric damper adjustment module (2) controls the opening and closing degree of the damper (5) according to the control signal, thereby adjusting the negative pressure value in the dehumidification pipe, including: The PLC controller (1) obtains the target opening degree from a preset opening degree curve. The PLC controller (1) generates a corresponding control signal according to the detection data and the target opening degree, and sends the control signal to the electric damper module (2). The electric damper module (2) controls the damper (5) to the target opening degree according to the control signal, thereby adjusting the negative pressure value in the dehumidification duct.

10. The method for controlling dehumidification wind pressure according to claim 9, It is characterized in that The preset opening and closing degree curve includes: Opening degree = (negative pressure value in the dehumidification pipe - B) / A In the formula, A is the weight and B is the negative pressure value when the damper is closed.

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