VOCs治理设计方案
发表时间 : 2014-11-21 作者 : admin 浏览 : 183
集气罩与管道系统的设计/Design of gas collecting hood and piping system:
主要内容/primary coverage:
●净化系统的组成及系统设计的基本内容 The composition of the purification system and the basic content of the system design
●集气罩的集气机理 Gas collecting mechanism of gas collecting hood
●集气罩的基本类型 The basic type of gas collection hood
●集气罩性能参数及计算 Performance parameters and calculation of gas collecting hood
●集气罩设计的方法 Method for designing gas collecting hood
●废气净化系统设计(注:第二部分) Exhaust gas purification system design (Note: second parts)
关键语录Key Quotes/:
(1) 集气罩:集气罩是用来捕集污染空气的,其性能对净化系统 的技术经济指标有直接的影响。由于污染源设备结构和生产操作工艺的不同、集气罩的形式是多种多样的。    
(2)风管:在净化系统中用以输送气流的管道称为风管,通过风管使系统的设备和部件连成一个整体。
(3)净化设备:为了防止大气污染 ,当排气中污染物含量超过排放标准时,必须采用净化设备进行处理,达到排放标准后 ,才能排人大气。    
(4)通风机 :通风机是系统中气体流动的动力。为了防止通风机的磨损和腐蚀 ,通常把风机设在净化装备的后面。      
(5)烟 囱: 烟囱是净化系统的排气装置。由于净化后的烟气中仍含有一定量的污染物。这些污染物在大气中扩散、稀释,并最终沉降到地面。
(1) gas collecting hood: gas collecting hood is used to collect polluted air, and its performance has direct influence on the technical and economic indexes of the purification system. As the pollution source, equipment structure and production operation process are different, the form of gas collecting hood is varied.
(2) air duct: in the purification system, the pipe used to transport the air flow is called the air pipe, and the equipment and components of the system are connected into a whole through the wind pipe.
(3) purification equipment: in order to prevent air pollution, when the content of pollutants in exhaust exceeds the emission standard, the purification equipment must be adopted to deal with the pollution. When the discharge standard is reached, the atmosphere can be discharged.
(4) fan: fan is the motive force of the gas flow in the system. In order to prevent ventilator wear and corrosion, usually in the wind behind machine purification equipment.
(5) chimney: the chimney is the exhaust device of the purification system. The purified flue gas still contains a certain amount of pollutants. These pollutants diffuse and dilute in the atmosphere and eventually sink to the ground.
设计结构基本内容/Basic content of design structure:
1、捕集装置设计(结构、安装、性能) 1. Design of collecting devices (structure, installation, performance)
2、净化系统的选择或设计 2 、 selection or design of purification system
  (1)选择依据 (1) selection basis;
      a.污染物的种类与性质; Types and properties of A. pollutants;              
      b.处理量; B. treatment capacity;                   
      c.净化效率; C. purification efficiency;       
      d.净化系统的环境、经济及社会效益。 Environmental, economic and social benefits of the D. purification system.
  (2)一般程序 (2) general procedure
      a.工程调查; A. engineering survey;                                     
      b.确定净化程度; B. determines the degree of purification;
      c.选择合理的净化工艺; C. choose a reasonable purification process;
      d.选择适当的净化装置,确定合理的净化系统配置;Select the proper cleaning device and determine the proper purification system configuration;
      e.确定净化系统运行参数和技术经济指标。 E. determine the operating parameters and technical and economic indicators of the purification system.
  (3)除尘系统与装置的选择 (3) selection of dust removal system and device;
  (4)吸收系统与装置的选择 (4) selection of absorption system and device
  (5)吸附系统与吸附装置的选择 (5) selection of adsorption system and adsorption unit;
  (6)净化装置的费用 (6) the cost of purifying equipment
     注:设备投资费、运行费用、总费用 Note: equipment investment, operating cost and total cost
3.管道系统的设计 3. piping system design
4.排放烟囱设计 4. chimney design
关键点:
集气罩的基本类型
集气罩:是烟气净化系统污染源的收集装置,可将粉尘及气体污染源导入净化系统,同时防止其向生产车间及大气扩散,造成污染。
形式:
(1)按罩口气流流动方式分为:吸气式和吹吸式;
(2)按集气罩与污染源的相对位置及适用范围,可将吸气式集气罩分为: 密闭罩、排气柜、外部集气罩、接受式集气罩等。
Key point:
The basic type of gas collection hood
The gas collecting hood is a collecting device for the pollution source of the flue gas purification system, and the dust and gas pollution source can be introduced into the purification system, and meanwhile, the dust can be prevented from spreading to the production workshop and the atmosphere, thereby causing pollution.
Form:
(1) according to the air flow pattern of the hood, it is divided into: suction type and blow type;
(2) according to the relative position and applicable range of gas collector and pollution source, the air suction hood can be divided into airtight hood, exhaust hood, external gas collecting hood, and accepted gas collecting hood, etc..
密闭罩
定义:将污染源的局部或整体密闭起来,在罩内保持一定负压,可防止污染物的任意扩散。特点:所需排风量最小,控制效果最好,且不受室内气流干扰,设计中应优先选用。
结构形式:局部密闭罩、 整体密闭罩、大容积密闭罩   
1.局部密闭罩
 特点:体积小,材料消耗少,操作与检修方便;
 适用:产尘点固定、产尘气流速度较小且连续产尘的地点。
2.整体密闭罩
 特点:容积大,密闭性好。
 适用:多点尘源、携气流速大或有振动的产尘设备。
3.大容积密闭罩
 特点:容积大,可缓冲产尘气流,减少局部正压,设备检修可在罩内进行。
适用:多点源、阵发性、气流速度大的设备和污染源。
4.布置要求
a.设置必要的观察窗、操作门和检修门;
b.罩内应保持一定的均衡负压,避免烟尘逸出;
c.尽量避开扬尘中心,防止大量物料随气流带至罩口被吸走;
d.处理热物料时,应考虑热压对气流运动的影响,通常适当加大密闭罩容积,吸风点设于罩子顶部最高点。
Airtight hood
Definition: the local or whole part of the pollution source is sealed up, and a certain negative pressure is kept in the cover, so as to prevent any diffusion of pollutants. Features: the minimum exhaust air demand, the best control effect, and free from indoor air flow interference, the design should be preferred.
Structure: local whole sealed cover, airtight cover, large volume sealed cover
1. part airtight cover
Features: small size, less material consumption, convenient operation and maintenance;
Application: it is a place where dust spots are fixed, dust production, airflow speed is small and continuous dust production.
2. integral airtight cover
Features: large volume, good tightness.
Suitable for dust producing equipment with multi point dust source, carrying gas, large flow rate or vibration.
3. large volume sealed cover
Features: large capacity, can cushion dust airflow, reduce local positive pressure, equipment maintenance can be carried out in the hood.
Application: multi point source, paroxysmal and air current equipment and pollution source.
4. layout requirements
A. sets the necessary observation windows, doors and doors;
B. hood should maintain a certain balance of negative pressure, to avoid dust escape;
C. as far as possible to avoid dust centers, to prevent a large number of materials with the airflow to the mouth to be sucked;
D. heat treatment material, should consider the effect of hot pressing on air flow, usually increase the airtight cover volume, suction point is arranged on the top of the highest point.
排气柜
排气柜可使产生有害烟尘的操作在柜内进行。
1. 结构形式
a、排气口在操作口对面操作口气流分布较均匀,有害气体外逸的可能性较小。
b、排气口设在柜顶 操作口上部形成较大进气流速,而下部进气流速较小, 气柜内易形成涡流,可能造成有害气体外逸
c、在对面和顶部同时设置排气口
2. 布置要求:尽量避开门窗和其它进风口。
更多设计要素请联系SUS环境技术部...
Exhaust cabinet
The exhaust cabinet enables the operation of harmful smoke and dust to be carried out in the cabinet.
1. structure form
The A and the exhaust port are opposite to the operating port, and the distribution of the air flow is more uniform, and the possibility of harmful gas escaping is less.
B, the exhaust port is arranged on the top of the cabinet to form a larger inlet flow of upper port operation, and lower inlet air flow is small, easy to form a vortex in gas holder, may cause harmful gas escaping
C set the vent at the opposite side and top
2., layout requirements: try to avoid doors and windows and other air inlet.
For more design elements, please contact the SUS environment technology division...


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