CN202744881U - Ventilation system for drying section of multi-dryer paper machine - Google Patents
Ventilation system for drying section of multi-dryer paper machine Download PDFInfo
- Publication number
- CN202744881U CN202744881U CN 201220438284 CN201220438284U CN202744881U CN 202744881 U CN202744881 U CN 202744881U CN 201220438284 CN201220438284 CN 201220438284 CN 201220438284 U CN201220438284 U CN 201220438284U CN 202744881 U CN202744881 U CN 202744881U
- Authority
- CN
- China
- Prior art keywords
- dry
- input
- circulating line
- section
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The utility model discloses a ventilation system for a drying section of a multi-dryer machine, which is applied to the paper-making industry. The ventilation system is characterized by comprising a circulating line, an exhaust line, an admission line, a circulating-line regulating valve and an exhaust valve, wherein the input terminals of both the circulating line and the exhaust line are arranged in a drying zone surrounded by a gas hood; the output terminal of the circulating line is connected with the input terminal of the admission line, and the output terminal of the admission line is connected with the drying zone; the circulating-line regulating valve is arranged on the circulating line; the exhaust valve is arranged on the exhaust line; and the drying zone ranges from the exit of a press section to the entrance of a reeling section of the paper machine. The ventilation system can realize recycling of steam at the drying section, reduces energy consumption, improves the energy utilization efficiency of the drying section of the paper machine, and optimizes ventilation distribution.
Description
Technical field
The utility model relates to the paper machine technology field, particularly the ventilating system of drying section of paper machine.
Background technology
Paper-making industry is resource and energy-consuming type industry, and papermaking was classified as one of nine large highly energy-consuming emphasis supervision industries by National Development and Reform Committee already.Simultaneously along with the fast development of Chinese national economy, the increasing rapidly of the paper consumer goods, the market demand enlarges year by year, carries out technological improvement in the urgent need to paper-making industry in energy-saving and emission-reduction.
Paper-making process is a constantly process of dehydration, although wet web is minimum through the amount of moisture that drying section of paper machine removes, less than 1% of online slurry moisture, drying section but is the workshop section of paper-making process energy consumption maximum, accounts for more than 67% of paper-making process total energy consumption.Many drying cylinders type is to use at present maximum drying section of paper machine types, adopts the existing drying section of paper machine of this structure to account for 85%～90%.Drying section of paper machine is the most complicated part of paper-making process, relates to the basic processes such as Fluid Flow in A, heat transfer, mass transfer, mainly is made of steam-condensation water system and air system.Wherein the steam consumption of steam-condensation water system is maximum, also is the focus that people study, and has carried out a lot of element tasks around the steam condensate (SC) systematic research, and this technology is tending towards ripe substantially.And to air system, quantitative study is less, and that is that all right is ripe for this technology.The Dryer Section of Paper Machine air system comprises gas hood itself, ventilating system and heat recovery system.Air system is to grow up gradually along with constantly improving of gas hood, and the form of gas hood has experienced the development of open type, semi-enclosed and closed gas hood.The more semi-enclosed gas hood of closed air hood, the gas consumption that can reduce Drying Process approximately 15%～20%.But, because present stage, common practice was by some heat exchanger heats fresh airs or technical process water with the original steam in the drying section gas hood, then directly be discharged in the air, therefore, also existing a large amount of energy not have utilization just directly to be discharged into air has suffered, thus, structure and the operation of the ventilating system of many drying cylinders drying section of paper machine are optimized the emphasis that becomes the energy-conservation research of present stage paper machine.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of ventilating system for many drying cylinders drying section of paper machine is provided, and this ventilating system can realize Recycling and the residual heat recovery of drying section steam, reduces energy consumption, improve the drying section of paper machine efficiency of energy utilization, optimizing ventilates distributes.
In order to achieve the above object, the utility model adopts following technical scheme: a kind of ventilating system for many drying cylinders drying section of paper machine is characterized in that: comprise circulating line, discharge duct, admission line, circulating line control valve and air bleeding valve; The input of circulating line and the input of discharge duct are arranged on the dry section that is surrounded by gas hood; The output of described circulating line is connected with the input of admission line, and the output of described admission line is connected with dry section; Described circulating line control valve is arranged on the circulating line; Described air bleeding valve is arranged on the discharge duct; Described dry section refers to export to zone between the reeling end entrance from press section of a paper machine.
Further scheme is: also comprise for the dividing plate that dry section is separated into several dry subregions, the distance between adjacent two dividing plates is 2～5 meters; The input of described circulating line and the input of discharge duct are arranged on the dry section that is surrounded by gas hood, refer to that or two in the input of input, discharge duct of each dry subregion and circulating line is connected; The output of described admission line is connected with dry section, refers to output and each dry piecewise connection of admission line.
Specifically, 2～4 dry subregions near the reeling end entrance are made as the fixing district of doing, 2～4 dry subregions near the press section outlet are made as fixing wet district, all the other dry subregions are made as relative dry and wet zone; One or two in the input of described each dry subregion and circulating line, the input of discharge duct is connected, referring to be made as the fixing dry subregion of doing in the district only is connected with the input of circulating line, the dry subregion that is made as in the fixing wet district only is connected with the input of discharge duct, is made as dry subregion while and the input of circulating line in the relative dry and wet zone and is connected input with discharge duct and is connected.
Preferred scheme is: described ventilating system also comprises controller, is provided with Temperature Humidity Sensor in the described dry subregion; Described controller is connected with air bleeding valve with Temperature Humidity Sensor, circulating line control valve.
Described dividing plate refers to the dividing plate that can pack up or put down, and with the executing agency that realizes packing up or putting down; Described executing agency is connected with described controller.
Compared with prior art, the utlity model has following beneficial effect:
1, ventilating system of the present utility model is provided with circulating line, circulating line is connected with admission line, steam in the dry subregion of part is also relatively drier after use, this steam reuses in the drying operation of dry subregion by circulating line, realized the Recycling of steam, reduce the consumption of live steam, improved the drying section of paper machine efficiency of energy utilization;
2. ventilating system of the present utility model can enter the amount of the live steam of dry subregion, thereby control the temperature and humidity of this drying subregion by regulating the aperture of circulating line control valve with control, and control method is more flexible;
3, ventilating system of the present utility model is provided with dividing plate in dry section, and the steam of drier dry section and the steam of moister dry section are kept apart, and makes the better effects if of Steam Recovery; And when adjacent dry subregion humidity difference was little, dividing plate can be packed up, and the drying effect of the original place of dividing plate subregion is improved.
Description of drawings
Fig. 1 is the structural representation of the utility model ventilating system;
Fig. 2 is the workflow diagram of the utility model ventilating system.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment
Ventilating system of the present utility model is applied to many drying cylinders drying section of paper machine, and its structural representation as shown in Figure 1.Ventage turnkey circulating line 1, discharge duct 2, admission line 3, circulating line control valve and air bleeding valve; Also comprise dividing plate 4.
Dry section refers to the zone that exports between the reeling end entrance, surrounded by gas hood from press section of a paper machine.Gas hood is the hermetic type gas hood.Dividing plate is used for dry section is separated into several dry subregions, and the distance between adjacent two dividing plates is 2～5 meters.One or two in the input of each dry subregion and circulating line 1, the input of discharge duct 2 is connected, and the output of circulating line 1 is connected with the input of admission line 3, the output of admission line 3 and each dry piecewise connection.The circulating line control valve is arranged on the circulating line 1; Air bleeding valve is arranged on the discharge duct 2.
Principle of the present utility model is: in the dry subregion of part, steam is also relatively drier after use, and this steam can pass through circulating line 1, admission line 3, mixes with live steam in admission line 3, reuses in the drying operation of dry subregion.Live steam refers to the fresh air through heating.And in the dry subregion of part, steam humidity after use is higher, is not suitable for recycling, and then can discharge behind over-heat-exchanger by discharge duct 2.Because the steam that uses in the drying operation is to need the process heat treated, so after will using also relatively dry Steam Recovery use again, can reduce the consumption of live steam, reduce the energy consumption of air heat drying, improve the efficiency of energy utilization of drying section of paper machine.
One or two in the input of each dry subregion and circulating line 1 and the input that discharge duct is connected is connected.Concrete scheme is, because usually lower near the humidity of the dry subregion of reeling end entrance, so will be made as the fixing district of doing near 2～4 dry subregions of reeling end entrance; In like manner, because usually higher near the humidity of the dry subregion of press section outlet, so will be made as fixing wet district near 2～4 dry subregions of press section; All the other dry subregions are made as relative dry and wet zone.Being made as the fixing dry subregion of doing in the district only is connected with the input of circulating line 1, the dry subregion that is made as in the fixing wet district only is connected with the input of discharge duct 2, and the dry subregion that is made as in the relative dry and wet zone is connected with the input that the input of circulating line 1 is connected with discharge duct simultaneously.The benefit that arranges like this is: simplify the structure of ventilating system, save cost.
Ventilating system of the present utility model also comprises controller, and controller can adopt SIEMENS S7-300 series of PLC controller.Be respectively arranged with Temperature Humidity Sensor in each dry subregion, can interior temperature value and the humidity value of each dry subregion of Real-Time Monitoring.Controller is connected with air bleeding valve with Temperature Humidity Sensor, circulating line control valve.Controller can according to the data of Temperature Humidity Sensor collection, be controlled each circulating line control valve and air bleeding valve.Specifically, be set as in the dry subregion of relative dry and wet zone, the humidity data that can gather according to the temperature-humidity monitor in this drying subregion comes the state of controlled circulation pipeline control valve and air bleeding valve, make that any is in closed condition in the air bleeding valve of the circulating line control valve of circulating line and discharge duct, to be communicated with circulating line to control dry subregion, steam is reused, or be communicated with discharge duct, steam is drained.Can pass through the aperture of the circulating line control valve of controlled circulation pipeline, control the discharge capacity of steam in the dry subregion, thereby control the temperature and humidity of this drying subregion.
Also connect heat exchanger 5 after the ventilating system, heat exchanger 5 is connected with the output of discharge duct 2, the input of admission line 3.Its effect is the temperature of utilizing the steam of discharge duct 2, and the heating fresh air is passed to fresh air and makes the paper Dryly use in the admission line.The waste heat that this takes full advantage of original steam reaches energy-conservation purpose.
Dividing plate 4 specifically refers to the dividing plate that can pack up or put down, and with the executing agency that realizes packing up or putting down, executing agency is connected with described controller.When the psychrometric difference of adjacent dry subregion and temperature difference are little, can pack up dividing plate 4, make adjacent dry subregion become one and connect dry section; When the psychrometric difference of adjacent dry subregion and temperature difference become large, can put down dividing plate 4, be dry subregion independently connecting the dry section respacing.
The method of work of ventilating system of the present utility model, its workflow as shown in Figure 2.To be divided into by the dry section that gas hood surrounds several dry subregions, each dry partition length is 2～5 meters, and dry section refers to export to zone between the looping part of paper machine entrance from press section of a paper machine; 2～4 dry subregions near the looping part of paper machine entrance are made as the fixing district of doing, 2～4 dry subregions near the press section of a paper machine outlet are made as fixing wet district, all the other dry subregions are made as relative dry and wet zone;
The fixing gas of doing district's discharging entered directly that circulating line circulates and not to air venting; The gas of fixing wet district discharging is directly entered discharge duct and do not participate in circulation; Gas for the discharging of relative dry and wet zone: when relative humidity RH 〉=60%, gas directly enters discharge duct and does not participate in circulation; When relative humidity RH＜60%, gas enters circulating line and circulates.
Each dry subregion separates by dividing plate, is provided with in each dry subregion for the Temperature Humidity Sensor of measuring temperature and humidity; The fixing district of doing is connected (control valve on the circulating line can often be made as and open) with the input of circulating line, fixing wet district is connected (air bleeding valve on the discharge duct 2 can often be made as and open) with the input of discharge duct, with relative dry and wet zone simultaneously and the input of circulating line be connected input with discharge duct and be connected, at all circulating lines the circulating line control valve is set, at all discharge ducts air bleeding valve is set.
The control step that is arranged on the circulating line control valve of relative dry and wet zone and air bleeding valve and dividing plate is as follows:
The first step gathers humidity value, the temperature value of each dry subregion in the relative dry and wet zone;
When second step, the relative humidity RH in the dry subregion 〉=60%, close circulation pipe pipeline control valve, open the discharge duct air bleeding valve; When the relative humidity RH in the dry subregion＜60%, the circulating line control valve of ON cycle pipeline cuts out the air bleeding valve of discharge duct;
The 3rd step, when the relative humidity RH in the dry subregion＜60%, when arbitrary circulating line control valve is in psychrometric difference △ RH ' and temperature difference △ T ' between the dry subregion of low temperature and high humidity that the dry subregion of opening is adjacent, psychrometric difference △ RH when regulating the circulating line control valve with the last time compares with temperature difference △ T: when △ RH/ △ RH ' 〉=2 and △ T/ △ T ' 〉=2(psychrometric difference and temperature difference all reduce by 50%), reduce the aperture of this drying subregion circulating line control valve, to reduce capacity (when capacity reduces, the amount that live steam enters this drying subregion reduces, thereby the humidity of this drying subregion is raise, drop in temperature); When △ RH/ △ RH '≤1/2 and △ T/ △ T '≤1/2(are that psychrometric difference and temperature difference are when all increasing 50%), increase the aperture of this drying subregion circulating line control valve, to increase capacity (when capacity increases, the amount that live steam enters this drying subregion increases, thereby humidity decline, the temperature of this drying subregion are raise); The control method of this step is by the PID control method, regulates control, thereby keeps phase difference relatively stable of the humidity and temperature of adjacent two dry subregions.Otherwise, the circulating line control valve attitude of remaining stationary;
The 4th step, under the circulating line control valve is remained stationary the situation of attitude, when the psychrometric difference △ of adjacent dry subregion RH≤5%, and temperature difference △ T≤10 ℃, when the aperture of circulating line control valve is held time greater than setting value in adjacent two dry subregions simultaneously (setting value is 1～3 hour), dividing plate between the adjacent dry subregion is packed up, and makes adjacent dry subregion become one and connects dry section; When the psychrometric difference △ of adjacent dry subregion RH 〉=9% and temperature difference △ T 〉=20 ℃, dividing plate puts down.
Dividing plate can be realized packing up, putting down, and can make the ventilation of ventilating system distribute more optimization, and the drying effect of paper machine is better.Because unstable state changes and might be unusual in short-term in producing, and carries out continually packing up, putting down of dividing plate in order to reduce, so will set a suitable scope to executive condition.
Above-described embodiment is the better embodiment of the utility model; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection domain of the present utility model.
Claims (5)
1. a ventilating system that is used for many drying cylinders drying section of paper machine is characterized in that: comprise circulating line, discharge duct, admission line, circulating line control valve and air bleeding valve; The input of circulating line and the input of discharge duct are arranged on the dry section that is surrounded by gas hood; The output of described circulating line is connected with the input of admission line, and the output of described admission line is connected with dry section; Described circulating line control valve is arranged on the circulating line; Described air bleeding valve is arranged on the discharge duct; Described dry section refers to export to zone between the reeling end entrance from press section of a paper machine.
2. the ventilating system for many drying cylinders drying section of paper machine according to claim 1, it is characterized in that: also comprise for the dividing plate that dry section is separated into several dry subregions, the distance between adjacent two dividing plates is 2～5 meters; The input of described circulating line and the input of discharge duct are arranged on the dry section that is surrounded by gas hood, refer to that or two in the input of input, discharge duct of each dry subregion and circulating line is connected; The output of described admission line is connected with dry section, refers to output and each dry piecewise connection of admission line.
3. the ventilating system for many drying cylinders drying section of paper machine according to claim 2, it is characterized in that: will be made as the fixing district of doing near 2～4 dry subregions of reeling end entrance, 2～4 dry subregions that export near press section are made as fixing wet district, and all the other dry subregions are made as relative dry and wet zone; One or two in the input of described each dry subregion and circulating line, the input of discharge duct is connected, referring to be made as the fixing dry subregion of doing in the district only is connected with the input of circulating line, the dry subregion that is made as in the fixing wet district only is connected with the input of discharge duct, is made as dry subregion while and the input of circulating line in the relative dry and wet zone and is connected input with discharge duct and is connected.
4. the ventilating system for many drying cylinders drying section of paper machine according to claim 3, it is characterized in that: described ventilating system also comprises controller, is provided with Temperature Humidity Sensor in the described dry subregion; Described controller is connected with air bleeding valve with Temperature Humidity Sensor, circulating line control valve.
5. the ventilating system for many drying cylinders drying section of paper machine according to claim 4 is characterized in that: described dividing plate refers to the dividing plate that can pack up or put down, and with the executing agency that realizes packing up or putting down; Described executing agency is connected with described controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220438284 CN202744881U (en) | 2012-08-30 | 2012-08-30 | Ventilation system for drying section of multi-dryer paper machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220438284 CN202744881U (en) | 2012-08-30 | 2012-08-30 | Ventilation system for drying section of multi-dryer paper machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202744881U true CN202744881U (en) | 2013-02-20 |
Family
ID=47704305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220438284 Withdrawn - After Issue CN202744881U (en) | 2012-08-30 | 2012-08-30 | Ventilation system for drying section of multi-dryer paper machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202744881U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828434A (en) * | 2012-08-30 | 2012-12-19 | 华南理工大学 | Ventilation system for drying part of multi-dryer paper machine and working method thereof |
-
2012
- 2012-08-30 CN CN 201220438284 patent/CN202744881U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828434A (en) * | 2012-08-30 | 2012-12-19 | 华南理工大学 | Ventilation system for drying part of multi-dryer paper machine and working method thereof |
| CN102828434B (en) * | 2012-08-30 | 2016-01-20 | 华南理工大学 | Ventilation system for drying part of multi-dryer paper machine and working method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203487024U (en) | Heat pump low temperature sludge drying treatment system | |
| CN101792981B (en) | Optimization control system for energy system of drying part of paper machine | |
| CN106227279B (en) | Steam quality modulating system | |
| CN204694036U (en) | A kind of device utilizing tea drier exhaust heat preheating tealeaves | |
| CN204694037U (en) | A kind of tea drier waste heat recycling system equipment | |
| CN202744881U (en) | Ventilation system for drying section of multi-dryer paper machine | |
| CN104548888B (en) | A kind of filter press squeezing, percolation gas drying and preheating device and its implementation | |
| CN103438678A (en) | Efficient energy-saving pulp dewatering and drying equipment | |
| CN210623027U (en) | Cooling and dehumidifying device for air inlet of air compressor | |
| CN109028917B (en) | Energy-saving and consumption-reducing method for AGM partition plate production | |
| CN102828434B (en) | Ventilation system for drying part of multi-dryer paper machine and working method thereof | |
| CN103940208B (en) | Plasterboard industrial exhaust heat drying system | |
| CN206028094U (en) | Dry air make -up system of power lithium ion battery coating machine | |
| CN201688661U (en) | Energy-saving multistage fluidized continuous dryer | |
| CN201850466U (en) | Drying chamber | |
| CN205014803U (en) | Utilize waste heat of boiler flue gas's drying device | |
| CN212431541U (en) | Intelligent multilayer vapour electricity double-purpose drying equipment | |
| CN208139771U (en) | A kind of carton board hot-air drying device | |
| CN207216442U (en) | Textile raw material regain intelligent controlling device | |
| CN105013802A (en) | Organic solid waste high-temperature carbonization and drying system with waste heat utilization device | |
| CN215571674U (en) | Hot air drying room | |
| CN208296488U (en) | Novel roasting barn | |
| CN202359450U (en) | Multi-section drying device | |
| CN211668235U (en) | Steam reutilization energy-saving device of drying and shaping process | |
| CN220183464U (en) | Compressed air constant temperature control system for vortex spinning |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130220 Effective date of abandoning: 20160120 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |