WO2021051822A1 - Système modulaire de purification d'échappement industriel et procédé pour le réglage du nombre de tuyaux de branchement - Google Patents

Système modulaire de purification d'échappement industriel et procédé pour le réglage du nombre de tuyaux de branchement Download PDF

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Publication number
WO2021051822A1
WO2021051822A1 PCT/CN2020/088132 CN2020088132W WO2021051822A1 WO 2021051822 A1 WO2021051822 A1 WO 2021051822A1 CN 2020088132 W CN2020088132 W CN 2020088132W WO 2021051822 A1 WO2021051822 A1 WO 2021051822A1
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Prior art keywords
air volume
emission source
exhaust
branch pipe
source equipment
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PCT/CN2020/088132
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English (en)
Chinese (zh)
Inventor
丁涛
赵佳峰
徐兆军
朱南峰
陈秀兰
孙香
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南京林业大学
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Publication of WO2021051822A1 publication Critical patent/WO2021051822A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols

Definitions

  • the invention relates to a purification system, in particular to a modular industrial exhaust purification system and a method for setting the number of branch pipes.
  • the emissions mainly include dust and harmful gases. If they are not effectively treated, they will have an adverse impact on personnel health, process equipment, production safety, and product quality.
  • Equipping the production line with an industrial exhaust purification system is the mainstream method for processing production exhaust.
  • the system is a local exhaust system in the workshop ( Figure 1 and Figure 2).
  • Exhaust branch pipes are installed in each emission source equipment to perform exhaust gas treatment. Suction, the polluted airflow from each branch pipe is collected to the main pipe 4 through the airflow branch pipes (the first branch pipe 1, the first branch pipe 2 and the third branch pipe 3 in the figure), and finally enters the exhaust purification device, which is exhausted by the purification device 5.
  • the harmful substances in the air are separated from the air, and the purified air is discharged back to the atmosphere, and the harmful substances are effectively collected and centrally processed.
  • the system needs to be equipped with a fan 6 to provide the energy required for the absorption of harmful gases, the flow of pipeline gas and the passage of the purification device.
  • the power of the fan is calculated based on the discharge load of the workshop. The greater the exhaust gas emissions of the workshop, the higher the power required by the fan.
  • the air volume of each airflow branch pipe should be greater than or equal to the basic air volume value required to effectively absorb the exhaust from the pollution source.
  • the air volume value is mainly It depends on the exhaust characteristics of the pollution source, such as the work load of the equipment and the physical and chemical characteristics of the exhaust; the second is that the design airflow parameters of the branch pipes need to ensure that the pressure loss (resistance) of each parallel branch pipe is equal, that is, the so-called "pressure balance of the parallel pipeline" ", otherwise, each branch pipe will automatically adjust the airflow speed in the pipe during the actual work process until the pressure loss of each parallel branch pipe reaches the same value.
  • the traditional exhaust purification system also faces two problems.
  • One is that only part of the production equipment in the workshop may be in operation.
  • the air volume required for work is less than the rated air volume of the system, resulting in system energy consumption greater than actual needs.
  • frequency conversion technology is currently used so that the air volume of the fan can be adjusted according to the actual needs of the workshop, but this method has some shortcomings.
  • the air volume can be adjusted continuously, in fact, when the air volume deviates too much from the rated air volume, it will cause a significant drop in the efficiency of the fan and reduce the effective energy output of the fan.
  • the system only matches the total air volume with the required air volume of the workshop.
  • the actual air volume may be less than the minimum rated air volume, causing some particles in the airflow to settle at the bottom of the pipeline.
  • After long-term accumulation Block the pipeline, or cause safety hazards.
  • the second problem with traditional exhaust purification systems is that these systems are often equipped with a single purification device and fan. Once the purification device and fan fail, the entire system can only stop running, and the system has low fault tolerance.
  • the present invention proposes a modular industrial exhaust purification system, which greatly simplifies the "balance calculation" of parallel pipelines in the design process by arranging modular purification device units and distributed power systems.
  • the main consideration is the basic air volume required by each suction branch, which saves the total air volume required by the system and has energy-saving advantages.
  • the technical solution adopted by the present invention is: a modular industrial exhaust gas purification system, including a number of branch pipes, the branch pipes leading to exhaust gas emission source equipment, the exhaust gas emission source equipment has several; a purification unit connected to the branch pipe and A fan, the purification unit is used to purify the exhaust gas that the branch pipe is transported into the purification unit, and the fan is used to provide power for gas flow;
  • the discharge bin is used to collect the waste precipitated by the purification unit
  • the method for setting the number of branch pipes connected to each exhaust emission source equipment is:
  • the branch pipe includes a branch pipe and a general branch pipe, the branch pipe is connected to the purification unit through the general branch pipe, and each general branch pipe corresponds to a purification unit and a fan.
  • n branch pipes are used to jointly treat the exhaust emission source equipment, and the calculation scheme for n is as formula 1:
  • a branch pipe is set and the branch pipe is combined with the branch pipes of other exhaust gas emission source equipment to connect to the purification unit.
  • a% is 20% of the "reference air volume”
  • b% is 80% of the "reference air volume”.
  • the power of the fan of the purification unit does not exceed 10 kW.
  • a% is 10% of the "reference air volume”
  • b% is 90% of the "reference air volume”.
  • the present invention also provides a method for setting the number of branch pipes connected to exhaust gas emission source equipment.
  • the method is to calculate the total air volume required for the exhaust of several exhaust gas emission source equipment, and to obtain an even distribution to each unit according to the total air volume and the number of purification units.
  • the air volume of each purification unit is recorded as the "reference air volume”
  • the number of branch pipes required by each exhaust emission source equipment is obtained according to the basic exhaust air volume and the "reference air volume” of each exhaust emission source equipment.
  • each module includes an air suction hood, an air suction pipe, a fan, and a gas purification unit.
  • Each module can work independently to process part of the emission source gas in the workplace, or can be combined together to form a combined system.
  • the design of each branch pipe breaks the traditional method of setting up each sewage unit as a unit, and proposes a method of design and layout according to the set "reference air volume", so that the specifications of each purification unit and power module are unified, which greatly simplifies the system. Design to reduce manufacturing, installation and operating costs.
  • the system can turn off or turn on the corresponding power and purification unit according to the actual production conditions, without the use of frequency converters, and the adjustment of the operating conditions will not affect the work of other parts of the system, which has the advantages of simplicity and flexibility.
  • a certain purification or power unit in the system fails, only the unit needs to be diagnosed and repaired, and the rest can maintain normal operation.
  • the system has strong toughness and good fault tolerance.
  • FIG. 1 Schematic diagram of traditional industrial exhaust purification system
  • FIG. 3 is a schematic diagram of the industrial exhaust purification system proposed by the present invention.
  • Figure 4 Schematic diagram of the layout of the purification unit placed on one side of the system
  • FIG. 5 Schematic diagram of the layout of the purification unit placed on the top of the workshop.
  • the “reference air volume” is set according to the following principles: first determine the basic exhaust air volume requirements required by each exhaust emission source equipment, and then add the total air volume requirements of the system; then determine the required purification based on factors such as total air volume and workshop process characteristics
  • the number of units 5, a general principle for determining the number is that the air volume processed by each purification unit 5 is limited to a small level, so that the air volume power it is equipped with is also low, in principle, it does not exceed 10kW, so that it can be guaranteed
  • the operating parameters of the system in each purification unit 5 will not fluctuate greatly, and basically remain in a stable state.
  • the branch pipes include a main branch pipe 8 and branch pipes.
  • the main branch pipe 8 is connected to the purification unit 5, and the branch pipe and the remaining branch pipes are merged into the main branch pipe 8 and then connected to the purification unit 5.
  • the plan I set 8 purification units 5; divide the total air volume by the number of purification units 5 to get the "reference air volume" of the branch pipe 8, and set the exhaust branch pipe 8 according to this air volume (in plan I).
  • Schemes II, III, IV, V, and VI are equipped with different arrangements and different numbers of exhaust emission equipment.
  • the spatial layout of the main branch pipe 8 shall be carried out according to the following principles:
  • the difference threshold can be adjusted. For example, systems with higher precision requirements can set this difference to 10%.
  • n total branch pipes 8 are used to jointly treat the emission source.
  • the difference threshold can be adjusted, such as For systems that require higher accuracy, this difference can be set to 90%.
  • n The calculation scheme is as formula 1:
  • n-the number of total branch pipes 8; a 20 in this formula, it can be adjusted to 10 in a system with higher accuracy requirements.
  • Each main branch 8 of the system corresponds to a purification unit 5 and a fan 6.
  • the pipeline is directly connected to the purification unit 5, eliminating the main pipeline of the traditional system.
  • Each purification unit 5 shares the same discharge bin 7, and the fan 6 through a locker.
  • each branch pipe 8 only needs to select the fan 6 and the purification unit 5 to turn on or off according to the working conditions, with "0" and "1"
  • the simple logic replaces frequency conversion adjustment, which has the advantages of simplicity and reliability.
  • Another advantage of the modular design is that the working status of each branch pipe 8 has no effect on other pipelines of the system, and can be independently adjusted, and can be independently maintained when the processing unit has problems.
  • the shape, structure and layout of the purification unit 5 can be flexibly adjusted according to the working principle and workshop process. As shown in Figure 3, 6 structures and layout schemes from I to VI are given. As shown in Fig. 3, the different shapes are given to illustrate that the purification unit 5 can adopt different forms and combinations, which can be adjusted flexibly according to the needs of the application. This significantly increases the adaptability of the solution to different purification principles and process conditions, and can be applied to the technical requirements of various types of exhaust gas purification.
  • the first branch pipe 1, the second branch pipe 2 and the third branch pipe 3 are set at the exhaust emission source equipment a, the exhaust emission source equipment b and the exhaust emission source equipment c respectively ( Figure 1 and Figure 2), and then After being collected to the main pipe 4, the purification unit 5 is connected. After the balance calculation, the total air volume required by the system is 20130m 3 /h, the total air pressure is 3948Pa, and the power of the fan 6 is selected as 37kW.
  • the basic air volume of 3 exhaust emission source equipment is firstly added to obtain a total air volume of 18000m 3 /h.
  • the reference air volume of each branch pipe 8 is 4500m 3 /h.
  • the basic air volume requirement of equipment a is 3000m 3 /h, which is less than 80% of the reference air volume, so it is considered together with the adjacent equipment b.
  • the basic air volume requirement of equipment b is 5000m 3 /h, and the basic air volume of equipment a is 8000m 3 /h.
  • Two main branch pipes 8 can be used for processing. Each branch pipe 8 handles air volume of 4000m 3 /h.
  • the difference in reference air volume is less than 20%.
  • One of the main branch pipes is connected to equipment b, and the processing air volume is 4000m 3 /h.
  • the pipe 8-1 is merged into a branch pipe 8 for processing. Since the air volume of the two devices needs to be merged, the branch pipe 8 is a Y-shaped pipe, and the actual air volume after the balance calculation is 4050m 3 /h.
  • the basic air volume required by equipment c is more than 80% higher than the reference air volume, so two main branch pipes 8 are used for processing, and each branch pipe 8 processes 5000 m 3 /h, and the difference with the reference air volume is less than 20%.
  • standard air volume purification unit of each total branched tube 8 with 5 are 4500m 3 / h, the standard total air volume 18000m 3 / h, the actual air volume 18050m 3 / h, 10% lower than the conventional scheme; units
  • the power of the equipped fan 6 is 7.5kW, and the total installed capacity of the system is 30kW, which is 18% lower than the traditional scheme.
  • the total air volume obtained by this system based on the addition of the basic air volume of each device is 18000m 3 /h, which is the source of the standard total air volume.
  • the system space layout can be flexibly adjusted according to the actual needs of the workshop process.
  • the purification unit 5 can be placed on the side of the system ( Figure 4) or on the top of the workshop ( Figure 5).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un système modulaire de purification d'échappement industriel, comprenant : plusieurs tuyaux de branchement, les tuyaux de branchement conduisant à des dispositifs sources d'émission de gaz résiduaire et plusieurs dispositifs sources d'émission de gaz résiduaire étant présents ; une unité de purification (5) raccordée aux tuyaux de branchement et un ventilateur (6), l'unité de purification (5) étant utilisée pour la purification de gaz résiduaire acheminé dans l'unité de purification par les tuyaux de branchement et le ventilateur (6) étant utilisé pour la fourniture d'énergie pour la circulation de gaz ; et un bac de rejet, utilisé pour la récupération d'un matériau de déchet déposé par l'unité de purification. Le système adopte une conception modulaire et chaque module comprend une hotte d'aspiration, un tuyau d'aspiration, un ventilateur (6) et une unité de purification de gaz (5). Les modules peuvent fonctionner indépendamment pour traiter une partie du gaz source d'émission dans un lieu de travail et peuvent également être combinés pour former un système combiné.
PCT/CN2020/088132 2019-09-18 2020-04-30 Système modulaire de purification d'échappement industriel et procédé pour le réglage du nombre de tuyaux de branchement WO2021051822A1 (fr)

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CN201910881388.3A CN110711755B (zh) 2019-09-18 2019-09-18 一种模块化工业排气净化系统及支管数量设置方法
CN201910881388.3 2019-09-18

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CN110711755B (zh) * 2019-09-18 2021-09-03 南京林业大学 一种模块化工业排气净化系统及支管数量设置方法

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