CN220202321U

CN220202321U - System for detecting and adjusting internal pressure and temperature of paper machine gas hood

Info

Publication number: CN220202321U
Application number: CN202320895375.3U
Authority: CN
Inventors: 李冠浩; 卓双枝
Original assignee: Guangdong Kaituo Technology Co ltd
Current assignee: Guangdong Kaituo Technology Co ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2023-12-19
Anticipated expiration: 2033-04-19

Abstract

The utility model discloses a system for detecting and adjusting internal pressure and temperature of a gas hood of a paper machine, which comprises: comprises an air inlet chamber, an air distribution groove, an air spraying pipe, an exhaust chamber and a sensor; the air inlet chamber is vertically connected and communicated with the air distribution groove, and the air spraying pipe is vertically connected and communicated with the air distribution groove; the inlet of the air inlet chamber is provided with a plurality of flow guide pieces so as to adjust the flow direction of air entering the air inlet chamber; an air door is arranged at the communication part of the air inlet chamber and the air distribution groove so as to adjust the flow of the air flow; the sensor is distributed in the air inlet chamber, the air distribution groove, the air spraying pipe and the exhaust chamber, and the sensor is electrically connected with the central controller and the air inlet chamber, the air distribution groove, the air spraying pipe and the exhaust chamber. The utility model solves the technical problems of uneven heating, insufficient coverage degree and overlarge energy consumption in the prior art, and achieves the technical effects of uniform heating temperature and pressure, wide coverage surface, energy conservation and environmental protection.

Description

System for detecting and adjusting internal pressure and temperature of paper machine gas hood

Technical Field

The utility model relates to the technical field of papermaking equipment, in particular to a system for detecting and adjusting internal pressure and temperature of a gas hood of a papermaking machine.

Background

Paper is the most commonly used article in our daily life, and can be contacted with paper no matter reading, reading newspaper, or writing or drawing. Paper is also indispensible in industrial, agricultural and national defense industrial production. Paper is a powerful tool and material in terms of communicating ideas, propagating cultures, developing science and technology and production. Reviewing the history, the important substance is invented by ancient Chinese laborers. The four utility models of paper making technology, compass, gunpowder and printing technology, which are called Chinese ancient science and technology, are excellent contributions of Chinese people to the development of world science culture.

Modern papermaking processes can be divided into main steps of pulping, modulating, papermaking, processing and the like:

1. pulping process

Pulping is the first step in papermaking, and the general methods for converting wood into pulp include three methods, namely mechanical pulping, chemical pulping and semi-chemical pulping.

2. Modulation process

The modulation of the stock is another important point in papermaking, and the strength, tone, printability and the length of the paper shelf life after the paper is finished are directly related to the paper.

The general modulation process can be broadly divided into the following three steps: 1. dispersing slurry; 2. pulping; 3. adding glue and filling.

3. The main work of the paper making department is to interweave and dewater thin paper evenly, then dry, press polish, roll paper, cut, sort and package, so the common flow is as follows:

1. screening paper materials: the prepared paper stock is diluted again to a lower concentration, and impurities and undissociated fiber bundles are screened out again by a screening device, so that the quality is maintained and the device is protected.

2. Net part: the stock is caused to flow from the headbox over a circulating wire or plastic mesh and evenly distributed and interwoven.

3. Press section: the wet paper with the net surface removed is guided between two rollers with felt, and the wet paper is further dehydrated by the squeezing of the rollers and the water absorption function of the felt, and the paper is made to be compact, so that the paper surface is improved, and the strength is increased.

4. Drying cylinder: because the water content of the pressed wet paper is still up to 52% -70%, the mechanical force can not be used for pressing the moisture, so that the wet paper is dried by passing through a plurality of cylinder surfaces with hot steam introduced therein.

5. And (3) winding paper: the web is wound into rolls by a reel-up.

6. Cutting, sorting and packaging: taking a plurality of paper rolls which are rolled into a cylinder, cutting the paper into a piece of paper by a paper cutter, removing the damaged or stained paper by manual or mechanical sorting, and finally wrapping every five hundred sheets into a bag (commonly called a ream).

The wet paper after being pressed is dried into dry paper by steam, and the drying of the paper is the most critical step in the modern papermaking process. However, in the process of realizing the technical scheme in the prior art, the applicant finds that the technical scheme in the prior art has the following technical problems:

since a large amount of steam is required for drying paper, the energy consumption is increased, thereby increasing the production cost.

In addition, when the paper is dried, the hot air acts on the surface of the paper unevenly, so that the paper is heated and dried unevenly, and the quality of the paper is affected.

In addition, the drying process is not smooth due to the fact that the pressure of the air flow is uneven in the drying chamber, the quality of paper products is affected, and energy consumption is further improved.

Disclosure of Invention

The utility model aims to solve the technical problems of high energy consumption, high production cost, uneven heating temperature and air pressure and influence on paper quality in the prior art when paper is dried, and at least one of the technical effects of reducing energy consumption, heating uniformly and improving paper quality is achieved.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a system for detecting and adjusting the internal pressure and temperature of a gas hood of a paper machine comprises: comprises an air inlet chamber, an air distribution groove, an air spraying pipe, an exhaust chamber and a sensor; the air inlet chamber is vertically connected and communicated with the air distribution groove, and the air spraying pipe is vertically connected and communicated with the air distribution groove; the inlet of the air inlet chamber is provided with a plurality of flow guide pieces so as to adjust the flow direction of air entering the air inlet chamber; an air door is arranged at the communication part of the air inlet chamber and the air distribution groove so as to adjust the flow of the air flow; the sensor is distributed in the air inlet chamber, the air distribution groove, the air spraying pipe and the exhaust chamber, and the sensor is electrically connected with the central controller and the air inlet chamber, the air distribution groove, the air spraying pipe and the exhaust chamber.

Preferably, the air spraying pipe is a slit-type design ventilation pipe, so that the shape of fluid sprayed by the air spraying pipe is matched with the preset fluid spraying shape of the slit-type design ventilation pipe.

Preferably, the preset fluid ejection shape is a straight shape.

Preferably, the exhaust chamber is disposed above the air distribution groove.

Preferably, the exhaust chamber has a horn-shaped structure.

Preferably, the exhaust chamber has a horn-shaped structure with a small upper part and a big lower part. One or more technical schemes provided by the application have at least the following technical effects or advantages:

the opening degree of the air door is adjusted through the data of the temperature detection point and the wind pressure detection point, and the consistency of the air pressure and the air temperature at each position in the wet part air hood is ensured, so that the uniform blowing of the moisture in the wet paper is ensured, and the drying uniformity and the paper quality at each position of the paper surface are ensured.

Drawings

FIG. 1 is a schematic diagram of a scenario in which the present utility model is applied;

FIG. 2 is a perspective view of the present utility model;

FIG. 3 is a schematic diagram of the structure of the present utility model;

FIG. 4 is a schematic view showing the structure of the damper according to the present utility model;

FIG. 5 is a schematic diagram of the overall system of the present utility model;

fig. 6 is a schematic structural view of the dry and wet housing portions of the present utility model.

In the figure, 10, a sensor; 100. a housing; 110. a wet cover portion; 120. a dry cover portion; 130. a paper transport unit 200 and an air distribution mechanism; 210. an air outlet assembly; 220. a main air inlet duct; 230. a split air duct; 240. and (5) an air spraying pipe.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

In the papermaking process, the wet paper is dried by steam generally, but in the prior art, the uneven air pressure of a heating chamber is often caused by uneven steam distribution, and finally uneven heating is caused.

In addition, the paper quality is poor due to uneven heating.

In addition, uneven heating in turn leads to increased steam demand for drying paper, ultimately leading to problems of excessive energy consumption and increased production.

According to the technical scheme, the problems that in the prior art, energy consumption is high, production cost is high, heating temperature and air pressure are uneven and paper quality is affected when paper is dried are solved by providing the detection and adjustment system for the internal pressure and the temperature of the air hood of the paper machine, and the air distribution mechanism 200 penetrates through the shell 100 and is communicated with the wet hood part 110; the air distribution mechanism 200 is provided with an air inlet assembly, the air inlet assembly is provided with a plurality of hot air spraying openings, and the hot air spraying openings and the paper conveying component 130 are at preset hot air outlet angles to form a preset hot air spraying direction, so that the beneficial effects of reducing energy consumption, uniformly heating and improving paper quality are realized.

The general idea of the embodiment of the utility model for solving the technical problems is as follows:

a sheet transport member 130, a wet cover portion 110, a dry cover portion 120, and an air distribution mechanism 200 are used: a paper conveying member 130, a wet cover part 110 and a dry cover part 120 are provided in the housing 100; the air distribution mechanism 200 penetrates through the shell 100 and is communicated with the wet cover part 110; the air distribution mechanism 200 is provided with an air inlet assembly, the air inlet assembly is provided with a plurality of hot air outlets, the hot air outlets and the paper product transmission component 130 form a preset hot air outlet angle so as to form a series of technical means of adjusting the opening of the air door by combining the preset hot air outlet direction with the data of the temperature detection point and the wind pressure detection point, ensuring the consistency of the air pressure and the air temperature at each position in the wet part air hood, and the like. So that a plurality of hot air spraying openings spray air to the paper product to form a plurality of air walls, and the hot air is rebounded upwards after acting on the surface of the paper product and is taken away by the air distribution mechanism 200, thereby taking away the moisture of the paper product. In the process, each air wall forms a plurality of relatively independent heating spaces, and when moisture is taken away, air turbulence is avoided to influence air pressure and air temperature, so that the consumption of steam is reduced, the uniform blowing of moisture in wet paper is ensured, and the drying uniformity and the paper quality of the paper surface are ensured.

In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.

A paper machine hood internal pressure and temperature sensing and conditioning system, as shown in fig. 1, includes a housing 100, a paper conveying member 130, wet and dry hood sections 110, 120, and a wind distribution mechanism 200: a paper conveying member 130, a wet cover part 110 and a dry cover part 120 are provided in the housing 100; the air distribution mechanism 200 penetrates through the shell 100 and is communicated with the wet cover part 110; the air distribution mechanism 200 is provided with an air inlet assembly, the air inlet assembly is provided with a plurality of hot air spraying openings, and the hot air spraying openings and the paper product transmission component 130 form a preset hot air outlet angle to form a preset hot air spraying direction.

The hot air spouts wind to the paper product through the plurality of hot air spouts to form a plurality of air walls (hot air walls), and hot air is rebounded upwards after acting on the surface of the paper product between the two air walls and is taken away by the air distribution mechanism 200, and the hot air evaporates the moisture of the paper product and takes away the moisture of the paper product along with the hot air taken away by the air distribution mechanism 200.

Specifically, the paper transporting member 130 is provided with a drum on which paper is attached to rotate with the rotation direction of the drum; the preset hot air spraying direction is opposite to the tangent line of the rotating direction of the roller. The tangential line of the hot air direction and the rotating direction of the roller is opposite to maximize the impulse when the hot air collides with the paper, so that the acting force of the hot air and the paper is improved, and the paper drying efficiency is improved. More specifically, as shown in fig. 2, the air intake assembly is provided with a main air intake duct 220, a split air duct 230, and an air injection duct 240; the main air inlet duct 220 is vertically connected and communicated with the split air duct 230; the air spraying pipe 240 is vertically communicated with the air spraying pipe 240; the end of the air spraying pipe 240 away from the split air duct 230 is provided with a hot air spraying port.

More specifically, the air distribution mechanism 200 is further provided with an air outlet assembly 210, and the air outlet assembly 210 is provided with a plurality of air outlets, and the air outlets and the hot air outlets are staggered. The hot air applied to the surface of the paper takes away the moisture of the paper and then is discharged from the air outlet. Preferably, the position of the air outlet is higher than that of the hot air injection port.

In particular, the air distribution mechanism 200 is further provided with an air outlet assembly 210, the air outlet assembly 210 is provided with a main air exhaust groove, the main air exhaust groove is arranged at the top of the air distribution duct 230, and the air outlet is arranged between the air distribution ducts 230 below the main air exhaust groove. In order to further improve the uniformity of the hot air acting on the surface of the paper, the shape of the hot air nozzle adopts a slit shape. The gap-shaped air outlet can increase the area of the air outlet compared with the hole-shaped air outlet.

As the cylinder rotates, the paper passes through the wet hood section, moisture is carried away by the steam, and then transferred to the dry hood section. In order to avoid that the dry cover part is affected by the moisture of the wet cover part, a first air curtain is provided at the separation boundary between the dry cover part and the wet cover part as shown in fig. 3. The air curtain formed by hot air blocks moisture.

The air hood outlet is inevitably provided with an opening, and cold air easily enters the air hood from the opening, so that the energy efficiency and the drying effect of the air hood are affected. In order to prevent cool air from the hood outlet from entering the hood, a second air curtain is provided under the dry hood portion 120 as shown in fig. 4.

In order to further improve the energy-saving and environment-friendly characteristics of the device, the air distribution mechanism 200 is also provided with a temperature and pressure probe. And adjusting the opening and closing of the air door according to the temperature and the pressure.

In order to further improve the energy saving and environment friendly characteristics of the apparatus, as shown in fig. 5, a second air curtain is provided under (near the opening of) the dry cover part 120 in addition to the first air curtain provided at the separation boundary between the dry cover part 120 and the wet cover part 110. While preventing moisture from entering the dry housing portion 120, cold air may be further prevented from entering the housing 100.

To reduce the steam amount of the hood, the exhaust gas of the air outlet assembly 210 may be collected, and part of the exhaust gas may be recycled through an exhaust gas collection system.

Preferred embodiments of the present utility model are shown in fig. 5-6:

1. composition of the system:

1. temperature detection (multiple sets).

2. Wind pressure detection (multiple sets).

3. Damper(s).

2. The function of the system is as follows:

the opening degree of the air door(s) is adjusted by the data of the temperature detection points(s) and the wind pressure detection points(s), so that the air pressure and the wind temperature of each part in the wet part gas hood are consistent.

The uniform blowing-off of the moisture in the wet paper is ensured, and the drying uniformity and the paper quality of the paper surface are ensured.

The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, and yet fall within the scope of the utility model.

Claims

1. A system for detecting and regulating the internal pressure and temperature of a hood of a paper machine, characterized in that: comprises an air inlet chamber, an air distribution groove, an air spraying pipe, an exhaust chamber and a sensor; the air inlet chamber is vertically connected and communicated with the air distribution groove, and the air spraying pipe is vertically connected and communicated with the air distribution groove; the inlet of the air inlet chamber is provided with a plurality of flow guide pieces so as to adjust the flow direction of air entering the air inlet chamber; an air door is arranged at the communication part of the air inlet chamber and the air distribution groove so as to adjust the flow of the air flow; the sensor is distributed in the air inlet chamber, the air distribution groove, the air spraying pipe and the exhaust chamber, and the sensor is electrically connected with the central controller and the air inlet chamber, the air distribution groove, the air spraying pipe and the exhaust chamber.

2. The system for detecting and regulating the internal pressure and temperature of a hood of a paper machine according to claim 1, characterized in that: the air spraying pipe is a slit-type design ventilation pipe, so that the shape of fluid sprayed by the air spraying pipe is matched with the preset fluid spraying shape of the slit-type design ventilation pipe.

3. The paper machine hood internal pressure and temperature sensing and conditioning system of claim 2, wherein: the preset fluid spraying shape is a straight shape.

4. The system for detecting and regulating the internal pressure and temperature of a hood of a paper machine according to claim 1, characterized in that: the exhaust chamber is arranged above the air distribution groove.

5. The system for detecting and regulating the internal pressure and temperature of a hood of a paper machine according to claim 1, characterized in that: the exhaust chamber is of a horn-shaped structure.

6. The system for detecting and regulating the internal pressure and temperature of a hood of a paper machine according to claim 1, characterized in that: the exhaust chamber is of a horn-shaped structure with a small upper part and a big lower part.