Two-stage separation dust removal system of living paper machine
By designing a two-stage separation and dust removal system on a domestic paper machine, using the combination of venturi tubes and spray heads, efficient separation of large and fine dust is achieved, and the problems of dust escape and accumulation and blockage are solved, and efficient and energy-saving dust removal effect is achieved.
Patent Information
- Application Number
- CN202510612427.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-13
- Publication Date
- 2025-07-25
AI Technical Summary
In the prior art, the dust removal efficiency generated by domestic paper machines during the production process is low, especially fine particles of dust are easily escaped, and the dust is easily accumulated and blocked in the separator, affecting the production environment and safety.
A two-stage separation and dust removal system is adopted, including a Venturi tube, a first-stage separator and a second-stage separator. It is connected to the water supply equipment through a first-stage spray head and a second-stage spray head. Large and fine dust are collected respectively by the Venturi effect and centrifugal action, and the dust removal fan speed is adjusted through the dust removal fan controller to ensure efficient dust removal.
It achieves efficient separation of large particles and fine particles of dust, with a total dust removal efficiency of 99.2%, avoids dust accumulation and blockage, is energy-saving and environmentally friendly, and is suitable for promotion and application.
Smart Images
Figure CN120361660A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a dust removal system, especially a system for a tissue paper machine to perform two-stage separation and dust removal on the dust generated during the papermaking process. Background Art
[0002] Tissue paper is the main paper type produced in the pulp and paper industry. Tissue paper is produced by a tissue paper machine, which usually includes a wire section, a press section, a dryer section, and a reel section. The common machine type is a crescent former. In actual production, because the basis weight of tissue paper is relatively low and the fiber bonding strength is poor, and with the use of a creping doctor blade, a large amount of dust is often generated during the process of peeling the paper web from the Yankee cylinder by the creping doctor blade and transporting it to the reel section. The dust will float and deposit on places such as the workshop roof and floor, making the production site environment worse, being harmful to the health of workers, and posing a great fire hazard. The traditional dust removal method is to use a single-stage filtration separator to perform centralized dust removal on the dust collected from various places. It can be seen from the actual implementation that this dust removal method has the following disadvantages: First, the dust removal efficiency is low, only large particle dust can be removed, and fine particle dust is easy to escape; Second, the dust is easy to accumulate and block in the separator, and high-efficiency dust removal cannot be achieved. Summary of the Invention
[0003] The purpose of the present invention is to provide a two-stage separation dust removal system for a tissue paper machine, which can not only effectively remove large particle dust, but also remove fine particle dust, and the dust removal is efficient and reliable.
[0004] To achieve the above purpose, the present invention adopts the following technical solutions:
[0005] A two-stage separation dust removal system for a tissue paper machine, which is used for a tissue paper machine. The tissue paper machine includes a dryer section and a reel section. The dryer section includes a Yankee cylinder. After the paper web is peeled off from the Yankee cylinder by a creping doctor blade, it is transported to the reel section. An under-machine pulper is arranged below the paper web transported between the creping doctor blade and the reel section. Specifically, the two-stage separation dust removal system of the tissue paper machine includes a Venturi tube, a primary separator, and a secondary separator, wherein: the inlets of the Venturi tubes are respectively connected to the outlets of an intake pipe, and the inlet of the intake pipe serves as a dust suction point; the dust suction points are arranged above and below the paper web transported between the creping doctor blade and the reel section and inside the under-machine pulper; the outlets of the Venturi tubes are connected to the inlets of a primary separator via an input pipe, the outlets of the primary separators are jointly connected to the inlet of a secondary separator via an output pipe, and the outlet of the secondary separator is connected to a dust removal fan via a discharge pipe; a primary spray head is arranged inside the Venturi tube, and a secondary spray head is arranged between the baffle plate and the outlet of the secondary separator. The primary spray head and the secondary spray head are connected to a water supply device via a spray pipe.
[0006] The advantages of the present invention are as follows:
[0007] The present invention designs a two-stage dust removal mode. The primary separator collects large particle dust generated during the production process of household paper, and the secondary separator collects fine particle dust. Without increasing energy consumption, the dust removal efficiency is improved, the problem of easy escape of fine particle dust in the prior art is solved, and the dust will not accumulate and block in the primary and secondary separators, ensuring the efficient progress of dust removal, with low cost, energy conservation and environmental protection, and being suitable for popularization. Brief Description of the Drawings
[0008] Figure 1 It is a schematic diagram of the composition of the two-stage separation and dust removal system of the household paper machine of the present invention. Detailed Embodiment
[0009] The two-stage separation and dust removal system of the household paper machine of the present invention is designed for the existing household paper machines, such as the crescent paper machine. The household paper machine 10 includes a wire section, a pressing section, a drying section, and a winding section. Usually, the working area of the household paper machine is divided into two parts: the wet section and the dry section. The drying section includes a Yankee cylinder 11. After the paper web 20 is peeled off from the Yankee cylinder 11 by the creping doctor blade 12, it is conveyed to the winding section 13 for winding into a roll, and then household paper is formed. An under-machine pulper 14 is arranged below the paper web 20 conveyed between the creping doctor blade 12 and the winding section 13. The under-machine pulper 14 is used to collect the debris dropped from the paper web 20 conveyed between the creping doctor blade 12 and the winding section 13, such as Figure 1 The two-stage separation and dust removal system of the household paper machine of the present invention includes a Venturi tube 31, a primary separator 32, and a secondary separator 34, where: the inlets of the Venturi tubes 31 are respectively connected to the outlets of an intake pipe 41, and the inlet of the intake pipe 41 serves as a dust suction point 410; the dust suction points 410 are arranged above and below the paper web 20 conveyed between the creping doctor blade 12 and the winding section 13 and inside the under-machine pulper 14; the outlets of the Venturi tubes 31 are connected to the inlets of a primary separator 32 via an input pipe 42, the outlets of the primary separators 32 are jointly connected to the inlet of a secondary separator 34 via an output pipe 43, and the outlet of the secondary separator 34 is connected to a dust removal fan 35 via a discharge pipe 44; a primary spray head 51 is arranged inside the Venturi tube 31, and a secondary spray head 52 is arranged between the flow guiding baffle 342 and the outlet of the secondary separator 34. The primary spray head 51 and the secondary spray head 52 are connected to a water supply device (not shown in the figure) via a spray pipe 53.
[0010] In actual design, a plurality of dust suction points 410 are separately arranged above and below the paper web 20 conveyed between the creping doctor blade 12 and the winding section 13, and at least one dust suction point 410 is arranged inside the under-machine pulper 14.
[0011] In actual design, the structures of the primary separator 32 and the secondary separator 34 are the same, but the volume of the secondary separator 34 is much larger than that of the primary separator 32. Among them: the inlets of the primary separator 32 and the secondary separator 34 are of a gradually shrinking structure from outside to inside (not shown in the figure), the bottoms of the primary separator 32 and the secondary separator 34 are of a cone hopper structure 321 and are provided with sewage discharge ports, and the sewage discharge ports are connected to the sewage trench 33 via the collection pipe 45. The sewage trench 33 is used to collect the discharged wet dust.
[0012] In the present invention, the primary separator 32 and the secondary separator 34 are existing separator structures in this industry, generally including a tank body. The upper part of the tank body is cylindrical, the bottom is of a cone hopper structure, the side wall of the upper part of the tank body is provided with an inlet, the top of the tank body is provided with an outlet, the sewage discharge port is arranged at the bottom of the tank body, and a flow guiding baffle is arranged inside the tank body. The flow guiding baffle separates the inlet from the outlet. The dust-containing gas entering from the inlet needs to bypass the flow guiding baffle and then rise to the top outlet for discharge. As Figure 1 , the cone hopper structure of the primary separator 32 is shown by the reference numeral 321, the flow guiding baffle is shown by the reference numeral 322, the cone hopper structure of the secondary separator 34 is shown by the reference numeral 341, and the flow guiding baffle is shown by the reference numeral 342.
[0013] As Figure 1 , in actual implementation, a row of primary spray heads 51 can be arranged at the inlet position inside the Venturi tube 31. The primary spray heads 51 spray white water towards the outlet of the Venturi tube 31. The cooperative design of the Venturi tube 31 and the primary spray heads 51 is used to fully mix the entering dust-containing gas with the sprayed white water. Thus, the mixture after the dust-containing gas is mixed with the white water can utilize the sudden change in the air flow direction caused by the flow guiding baffle 322 inside the primary separator 32 to perform inertial separation on the large particle dust in the mixture. Then, the large particle dust is discharged from the bottom sewage discharge port of the primary separator 32 to the sewage trench 33. In addition, the sufficient mixing of the dust-containing gas and the white water before entering the primary separator 32 can avoid causing accumulation blockage to the primary separator 32 and the subsequent secondary separator 34, and improve the dust removal efficiency. Similarly, a row of secondary spray heads 52 can be arranged inside the secondary separator 34. The direction of the secondary spray heads 52 spraying white water is opposite to the outlet of the secondary separator 34. The mixture of the fine particle dust and the white water after the large particle dust is removed by each primary separator 32 enters the secondary separator 34 together. Under the centrifugal action (sudden change in the air flow direction) generated by the flow guiding baffle 342 inside the secondary separator 34 and the spraying action of the secondary spray heads 52, the fine particle dust is further separated out and discharged from the bottom sewage discharge port of the secondary separator 34 to the sewage trench 33.
[0014] As Figure 1 , electromagnetic valves 54 for starting and stopping the white water spraying operation are installed on the spray pipes 53 connected to the primary spray heads 51 and the secondary spray heads 52.
[0015] like Figure 1 A pressure differential sensor 36 is installed on the output pipe 43 connected to the outlet of each primary separator 32 and the exhaust pipe 44 connected to the outlet of the secondary separator 34. Each pressure differential sensor 36 is connected to a fan controller 37. The fan controller 37 is used to adjust the speed of the dust removal fan 35 according to the pressure difference change between the primary separator 32 and the secondary separator 34 detected by the pressure differential sensor 36, so as to ensure continuous and efficient dust removal, which can effectively reduce energy consumption.
[0016] In the present invention, the dust removal fan 35 is an induced draft fan.
[0017] During the production process of household paper, the two-stage separation dust removal system of the present invention is turned on to perform real-time dust removal, such as Figure 1 Under the action of the dust removal fan 35, the dust-containing gas is collected by the air inlet pipe 41 set at each dust suction point 410 and enters the venturi tube 31. Under the action of the white water sprayed by the first-level spray head 51, the dust-containing gas and the white water are fully mixed to form a mixture and then enter the first-level separator 32. In the first-level separator 32, large dust particles hit the guide baffle 322 and then achieve inertial separation. After falling into the bottom cone bucket structure 321, they are discharged to the sewage ditch 33 through the collection pipe 45. Then, the remaining mixture enters the second-level separator 34. Therefore, the fine dust particles are further separated under the centrifugal action (sudden change of air flow direction) generated by the guide baffle 342 and the action of the white water sprayed by the second-level spray head 52. They slide down along the inner wall of the second-level separator 34 to the bottom cone bucket structure 341 and then are discharged to the sewage ditch 33 through the collection pipe 45. At this point, the dust in the collected dust-containing gas is fully separated and removed, and the clean gas is discharged to the outside from the dust removal fan 35.
[0018] The present invention achieves a separation efficiency of ≥85% through the primary separator 32 and a separation efficiency of ≥95% through the secondary separator 34. The total dust removal efficiency can reach 99.2%, which is highly efficient, reliable, energy-saving and environmentally friendly.
[0019] The advantages of the present invention are:
[0020] The present invention designs a two-stage dust removal mode. The first-stage separator collects large-particle dust generated in the production process of household paper, and the second-stage separator collects fine-particle dust. The dust removal efficiency is improved without increasing energy consumption, and the problem of easy escape of fine-particle dust in the prior art is solved. Dust will not cause accumulation and blockage in the first-stage and second-stage separators, thereby ensuring efficient dust removal, low cost, energy saving and environmental protection, and suitable for promotion.
[0021] The above is a preferred embodiment of the present invention and the technical principles applied thereby. For those skilled in the art, any obvious changes such as equivalent transformations and simple substitutions based on the technical solution of the present invention without departing from the spirit and scope of the present invention shall fall within the protection scope of the present invention.
Claims
1. A two-stage separation and dust removal system for a tissue paper machine. The tissue paper machine includes a drying section and a winding section. The drying section includes a Yankee cylinder. After the paper web is peeled off from the Yankee cylinder by a creping doctor blade and then conveyed to the winding section, an under-machine pulper tank is arranged below the paper web conveyed between the creping doctor blade and the winding section. It is characterized in that, The two-stage separation and dust removal system of the tissue paper machine includes Venturi tubes, a primary separator, and a secondary separator, where: the inlets of the Venturi tubes are respectively connected to the outlets of an intake pipe, and the inlet of the intake pipe serves as a dust suction point; the dust suction points are arranged above and below the paper web conveyed between the creping doctor blade and the reel section, as well as inside the under-machine pulper; the outlets of the Venturi tubes are connected to the inlets of a primary separator via input pipes, the outlets of the primary separators are jointly connected to the inlet of a secondary separator via output pipes, and the outlet of the secondary separator is connected to a dust removal fan via a discharge pipe; a primary spray head is arranged inside the Venturi tubes, and a secondary spray head is arranged between the deflector baffle and the outlet of the secondary separator. The primary spray head and the secondary spray head are connected to a water supply device via a spray pipe.
2. The two-stage separation and dust removal system of the household paper machine according to claim 1, characterized in that, A plurality of the dust suction points are separately arranged above and below the paper web conveyed between the creping doctor blade and the reel section, and at least one dust suction point is arranged inside the under-machine pulper.
3. The two-stage separation and dust removal system of the household paper machine according to claim 1, characterized in that The structures of the primary separator and the secondary separator are the same, but the volume of the secondary separator is much larger than that of the primary separator. Wherein: the inlets of the primary separator and the secondary separator are of a gradually narrowing structure from outside to inside, the bottoms of the primary separator and the secondary separator are of a conical hopper structure and are provided with sewage outlets, and the sewage outlets are connected to a sewage trench via a collection pipe.
4. The two-stage separation and dust removal system of the household paper machine according to claim 1, characterized in that, An electromagnetic valve for starting and stopping the white water spraying operation is installed on the spray pipe connected to the primary spray head and the secondary spray head.
5. The two-stage separation and dust removal system of the household paper machine according to claim 1, characterized in that, Differential pressure sensors are installed on the output pipes connected to the outlets of the primary separators and the discharge pipes connected to the outlets of the secondary separators. Each differential pressure sensor is connected to a fan controller, and the fan controller is used to adjust the rotational speed of the dust removal fan according to the differential pressure change between the primary separator and the secondary separator detected by the differential pressure sensor.
6. The two-stage separation and dust removal system of the tissue paper machine according to claim 5, characterized in that, The dust removal fan is an induced draft fan.