CN102535232A - Ventilation method for paper mill - Google Patents
Ventilation method for paper mill Download PDFInfo
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- CN102535232A CN102535232A CN2010105926681A CN201010592668A CN102535232A CN 102535232 A CN102535232 A CN 102535232A CN 2010105926681 A CN2010105926681 A CN 2010105926681A CN 201010592668 A CN201010592668 A CN 201010592668A CN 102535232 A CN102535232 A CN 102535232A
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Abstract
The invention relates to a ventilation method for a paper mill. The ventilation method comprises the following steps of: (1) recycling heat in hot exhaust air from a gas hood through a low-temperature heat pipe; (2) changing a wall axial-flow fan into a negative-pressure fan system so as to improve exhaust efficiency; (3) mounting a dehumidification device at a net part and a press part; (4) performing heat insulation perfection on a ventilation system of the gas hood; and (5) improving the structure of a factory building and reducing a cold and hot convection effect. According to the ventilation method disclosed by the invention, ventilation can be conveniently and effectively performed on the paper mill.
Description
Technical field
The present invention relates to a kind of paper plant method of ventilation, more specifically, relate to a kind of method of ventilation of northern paper plant, belong to enterprise production technical method field.
Background technology
North of china in winter paper machine factory building gate, window have all been taked tight sealing measure; To guarantee that indoor temperature satisfies production requirement, it is less to see through the indoor amount of fresh air of slits infiltrations such as gate, window, and exhaust air rate is generally much larger than air output; Indoor negative pressure is big; The drying cylinder steam consumption of sealing gas hood is big, and be mainly reflected in: the exhaust air rate of (1) paper machine gas hood is much larger than gas hood hot blast input quantity, drying cylinder transpiring moisture and gas hood inleakage three's summation, and gas hood inside is the negative pressure running status; (2) for discharging wet end, the formed moisture of press section transpiring moisture as early as possible; Avoiding ceiling to drip influences quality of finished paper; Generally the side at factory building is equipped with a large amount of wall axial flow blower and roof ventilator, and its exhaust air rate is also much larger than the air output of forced draft system.
Cause the factor of indoor hygrothermal environment:
(1) the page evaporated water of web part of paper machine, press section accounts for 40% of total displacement, because indoor temperature is high, a large amount of water evaporations off the net disengage; Felt high temperature shower water flow is bigger simultaneously, and the steam of its evaporation is more.
(2) because the requirement of beating process, the pulping temperature is generally all about 40 ℃, and whole making beating flow preparation jar, equipment, slurry pipeline all are not incubated, and it is indoor that great amount of heat is dispersed into, and causes environment temperature high.
(3) Dryer Section of Paper Machine adopts the high dew point sealing of high insulation gas hood, but the sealing gas hood of its transmission side, fore side comprehensively is not incubated processing, and gas hood outer casing temperature is high, causes drying section both sides temperature higher; Because the external exhaust blower of wet end is more, hot blast flows toward wet end, press section mostly simultaneously, causes high, the high humidity of temperature here.
(4) insulation of paper machine dryer steam pipe is not thorough, and the drying cylinder end cap does not have insulation etc. and causes heat dissipation capacity bigger.
The loss analysis of thermal environment:
(1) energy loss: the humid air temperature of discharge is generally about 80 ℃; Through test; Paper machine gas hood hot blast exhaust air rate is generally about 40000m3/h, and temperature of outgoing air is by 80 ℃ of calculating, and it is converted to the steam of 180 ℃ of 0.5MPa, temperature; Be equivalent to per hour discharge 1t steam, recoverable value is bigger.
(2) power consumption increases: because of air draft, air-supply do not match, cause exhaust air rate excessive, increased the power consumption of exhaust blower.Calculate by begin to rehearse less wind-powered electricity generation machine capacity 15kW, a 180d operation in winter of 1 paper machine, the 60MWh that can economize on electricity is many.
(3) capital construction loss: paper plant's house span is big, and the house is most to adopt the light-duty roof of steel construction, because the restriction of many factors such as design, construction, insulation very is not suitable for northern paper industry.The exhaust air rate of present paper industry is generally about a times of air output, and indoor temperature is high, air unit weight is little, negative pressure is big, forms pressure differential at opening part, is called " hot pressing ".Hot pressing makes the big outdoor cold air of the low unit weight of temperature in slit inlet chambers such as gate, window, roof lintel, and the rising hot-air that temperature is high, unit weight the is little formation convection current with equivalent forms dripping phenomenon, can cause gate, window deformed damaged, wall
Problems such as finedraw appear in moist, roof, can influence production when serious.
Summary of the invention
In order to solve the problems of the technologies described above, it is following to the invention provides a kind of paper plant method of ventilation:
The prerequisite that solves the power house ventilation problem is under rational energy consumption situation, solves from wet, thermogenetic source, reduces its generation, in the very first time, the damp-heat that produces is discharged simultaneously, could solve the problem of indoor thermal environment so up hill and dale.
Because of high humid and warm environment mainly be by drying section gas hood air supplying and exhausting system and wet end water evaporation the result of common influence; Therefore start with from this two aspect, take adequate measures, discharge high temperature, high humidity in time; Carry fresh air, could satisfy manufacturing technique requirent.
At first, adopt Cryo Heat Tube that the heat of gas hood hot type wind is recycled
Heat pipe is made up of shell, wick and end cap, in evacuated pipe, fills with suitable working solution, again with its sealed at both ends.Heat pipe be evaporimeter be again condenser.One end of hot-fluid heat absorption is an evaporator section, and working medium absorbs heat back carburation by evaporation, and flowing to the other end is condensation segment heat release liquefaction, and relies on the capillary force effect to flow back to evaporator section, accomplishes circulation automatically.Because the preference temperature of Cryo Heat Tube is-40～80 ℃; The cross pollution that can thoroughly stop to leak out and cause; Characteristics such as heat recovery efficiency height use in the gas hood air draft that to carry out recuperation of heat be very suitable; The heat that reclaims can be used for factory building heating and supplement production etc., and simultaneously outer exhaust air rate reduces, and can reduce indoor negative pressure.
Secondly, change the wall axial flow blower into the negative-pressure air fan system, improve ventilation efficiency
Negative-pressure air fan is to be horn-like to the absorption of air, can not only drive the air-flow of axis, can also be by outwards being trumpet-shaped scrolling air in the blower fan; And the air-flow of axial flow blower property linearly seldom drives the air of periphery.The characteristic of negative-pressure air fan has determined the thorough and high efficiency of exhaust.The inlet scoop of negative-pressure air fan should be arranged in wet end, press section top as far as possible, adopts the liftable formula that is flexible coupling, and is convenient to maintenance, can improve air draught efficient, can reduce fan operation platform number according to the production needs.Simultaneously, to the humiture situation of negative-pressure air fan exhaust necessary dehydrating unit such as rotary dehumidifier etc. can be installed.In the high humidity dehumidifying back loopback factory building of discharging,, improve hot environment to reduce indoor negative pressure.
Then, at wet end, press section humidity-discharging device is installed
Moisture is mainly discharged from wet end, press section evaporation, therefore need be at installation dehumidification system off the net.Consider to safeguard, overhaul the influence that reaches production technology; Need different situations according to different web part of paper machine, press section; Calculate the moisture total amount of evaporation like shower water flow, temperature, online concentration, the web dryness etc. that goes out press section; Carry out design and installation according to the different location evaporation capacity, can reduce the quantity of wall exhaust blower, improve the hydrofuge effect.
And then, be incubated perfect to gas hood ventilating system etc.
High temperature source mainly is the heat radiation of steam-heating system and gas hood, and wherein the ratio that accounts for of the heat radiation of gas hood is maximum.The most of just one deck thin plate of the gas hood backplate of existing paper machine is not incubated processing, and it is bigger to dispel the heat.So, must be incubated processing all sidedly to the gas hood backplate of front side, rear side, fore side, transmission side, adopt high insulation material, reduce the outer casing temperature, stop up leakage hole, reduce the heat radiation of hot blast, improve thermal environment.Simultaneously, because of the gas hood internal-external temperature difference is big, the gas hood inside ceiling panel condenses a large amount of condensed waters, influences the quality of page, recommends top board is incubated, and reduces the loss of heat.Improve the insulation of beating equipment, slurry pipeline, though its surface temperature is no more than 50 ℃, number of tubes is big, and heat dissipation capacity is also bigger, is the major influence factors that causes making beating workspace thermal environment.
At last, improve mill construction, reduce cold and hot convection effect
Monolithic reinforced-concrete structures should be taked in factory building roof, the north, can avoid steel construction light-duty roof melting ice and snow greatly, and seam is bad, the dripping phenomenon that cold-hot air convection etc. cause.Existing window arrangement is upgraded.In the higher zone of temperature a certain amount of air-inlet window is set.Air-inlet window should be divided into two rows; Summer by under arrange the window air intake, close down row's window winter, go up row's window air intake by the above absolute altitude of 4m; Making humidity is after zero cold air gets into factory building; Top suck a certain amount of damp-heat by preheating after, flow to the production area again, can alleviate effectively that indoor fresh air is few, high humidity, undesirable condition that negative pressure is big.Simultaneously, also can a certain amount of row, air-inlet window up and down be set in the few zone of flow of personnel, replenishing outside humidity automatically is zero new wind.
In a word, through the comprehensive matching of above measure, adopt the package solution of advanced technology, dependable performance, through the design of science, rigorous construction under the prerequisite that guarantees energy savings, has effectively solved the not good technical problem of power house ventilation in winter.
The specific embodiment
A kind of paper plant method of ventilation comprises: (1) adopts Cryo Heat Tube that the heat of gas hood hot type wind is recycled; (2) change the wall axial flow blower into the negative-pressure air fan system, improve ventilation efficiency; (3) at wet end, press section humidity-discharging device is installed; (4) be incubated perfect to the gas hood ventilating system; (5) improve mill construction, reduce cold and hot convection effect.Wherein, the heat of the gas hood hot type wind of described recovery is used for factory building heating and supplement production; The inlet scoop of said negative-pressure air fan should be arranged in wet end, press section top, adopts the liftable formula that is flexible coupling; Saidly at wet end, press section humidity-discharging device is installed and is comprised different situations, calculate the moisture total amount of evaporation, carry out design and installation according to the different location evaporation capacity according to different web part of paper machine, press section; Wherein said the gas hood ventilating system is incubated to improve comprise top board be incubated; The wherein said mill construction that improves comprises air-inlet window is divided into two rows, summer by under arrange the window air intake, close down row's window winter, by the row's of going up window air intake of the above absolute altitude of 4m.
Claims (2)
1. paper plant's method of ventilation comprises:
(1) adopt Cryo Heat Tube that the heat of gas hood hot type wind is recycled;
(2) change the wall axial flow blower into the negative-pressure air fan system, improve ventilation efficiency;
(3) at wet end, press section humidity-discharging device is installed;
(4) be incubated perfect to the gas hood ventilating system;
(5) improve mill construction, reduce cold and hot convection effect.
2. a kind of paper plant method of ventilation described in claim 1, wherein:
(1) heat of the gas hood hot type wind of described recovery is used for factory building heating and supplement production;
(2) inlet scoop of said negative-pressure air fan should be arranged in wet end, press section top, adopts the liftable formula that is flexible coupling;
(3) saidly at wet end, press section humidity-discharging device is installed and is comprised different situations, calculate the moisture total amount of evaporation, carry out design and installation according to the different location evaporation capacity according to different web part of paper machine, press section;
(4) wherein said the gas hood ventilating system is incubated to improve comprise top board be incubated;
(5) the wherein said mill construction that improves comprises air-inlet window is divided into two rows, summer by under arrange the window air intake, close down row's window winter, by the row's of going up window air intake of the above absolute altitude of 4m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105926681A CN102535232A (en) | 2010-12-17 | 2010-12-17 | Ventilation method for paper mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105926681A CN102535232A (en) | 2010-12-17 | 2010-12-17 | Ventilation method for paper mill |
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| Publication Number | Publication Date |
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| CN102535232A true CN102535232A (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105926681A Pending CN102535232A (en) | 2010-12-17 | 2010-12-17 | Ventilation method for paper mill |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108677586A (en) * | 2018-07-20 | 2018-10-19 | 布鲁奇维尔通风设备启东有限公司 | A kind of high dew point closed air hood of detachable |
| DE102022110021A1 (en) | 2022-04-26 | 2023-10-26 | Voith Patent Gmbh | Device and method for indoor air control |
-
2010
- 2010-12-17 CN CN2010105926681A patent/CN102535232A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108677586A (en) * | 2018-07-20 | 2018-10-19 | 布鲁奇维尔通风设备启东有限公司 | A kind of high dew point closed air hood of detachable |
| CN108677586B (en) * | 2018-07-20 | 2023-08-01 | 布鲁奇维尔通风设备启东有限公司 | Detachable high dew point airtight gas hood |
| DE102022110021A1 (en) | 2022-04-26 | 2023-10-26 | Voith Patent Gmbh | Device and method for indoor air control |
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Application publication date: 20120704 |