If the air volume required for ventilation and smoke exhaust is large and the excavation roadway is long, partial ventilation (excavation) shall be selected. Excavation ventilation refers to the ventilation using partial ventilation and smoke exhaust equipment in order to dilute and discharge harmful gas, mineral dust and gun smoke and create an excellent meteorological environment.

1.通风管道体系余热使用。在通风除尘体系设置余热锅炉、热管换热器、冷却排管等，用以发作蒸汽、热水、热风，以求限度地使用通风体系的余热，提高动力综合使用效率。

1. Use of waste heat in ventilation duct system. Waste heat boiler, heat pipe heat exchanger and cooling exhaust pipe are set in the ventilation and dust removal system to generate steam, hot water and hot air, so as to make maximum use of the waste heat of the ventilation system and improve the comprehensive utilization efficiency of power.

2.可变烟气量。不少烟气净化体系随工艺要求的不同，在不同时段发生的烟气量也不同，为了习惯这种需求，选用多种不同方式的调速装置，以节约动力，削减通风体系的运转费用。

2. Variable flue gas volume. Many flue gas purification systems have different amount of flue gas in different periods with different process requirements. In order to get used to this demand, a variety of speed regulating devices in different ways are selected to save power and reduce the operation cost of ventilation system.

3.通风管道部分排风罩优化规划。部分排风罩方式的直接影响通风体系的作用。通风管道研讨部分排风罩的气流特征、部分排风罩旧日气流的流态与操作工人的联系，规划适宜工艺特色与工艺设备的部分排风罩，成为当今首要的研讨课题。

3. Optimization planning of exhaust hood of ventilation duct. The advantages of partial exhaust hood directly affect the function of ventilation system. It has become the primary research topic to study the air flow characteristics of some exhaust hoods, the relationship between the old air flow pattern of some exhaust hoods and operators, and plan some exhaust hoods suitable for process characteristics and process equipment.

4.积极研讨移动、阵发性尘源的操控技能。对固定恒稳产尘的尘源点已有不少成熟的操控技能。但在黑色锻炼、有色锻炼、金属熔铸、港口装卸、矿山采掘等职业，尚存在大陆的移动、阵发性尘源，这些尘源方位是移动的、阵发性的，瞬时发出浓度很高，涣散的面积很广。根据实测计算，这部分尘源所排出的粉尘量往往占上述出产厂或出产工序总排尘量的28%~36%。现在较多的选用全 面通风换气，出资太高。如何采纳相对节省的出资技能措施，达到区域性的操控是现在通风技能研讨的重要课题。

4. Actively discuss the control skills of mobile and paroxysmal dust sources. There are many mature control skills for the dust source point with fixed and stable dust production. However, in black exercise, nonferrous exercise, metal melting and casting, port loading and unloading, mining and other occupations, there are still mobile and paroxysmal dust sources in the mainland. The orientation of these dust sources is mobile and paroxysmal, the instantaneous emission concentration is very high, and the LAX area is very wide. According to the actual measurement and calculation, the dust discharged by this part of dust sources often accounts for 28% ~ 36% of the total dust discharged by the above-mentioned factories or production processes. Now more comprehensive ventilation is used, and the investment is too high. How to adopt relatively economical measures to achieve regional control is an important topic in ventilation technology research.

5.通风管道开发中小企业的粉尘、废气管理的实用技能。近年来，中小企业取得迅速发展，但因为自己短少，出产技能装备及工艺落后，粉尘、废气危害日益突出，严重影响了从业人员的身心健康，污染了大气环境。这类企业因为短少资金与技能，无法照搬大企业的通风管道，因而急待开发契合中小企业经济特色，出资少。维护费用低，适用灵敏、简单易行的通风实用技能。

5. Develop practical skills in dust and waste gas management of small and medium-sized enterprises. In recent years, small and medium-sized enterprises have achieved rapid development, but due to their shortage, backward production skills, equipment and technology, the harm of dust and waste gas is becoming increasingly prominent, which has seriously affected the physical and mental health of employees and polluted the atmospheric environment. Due to the lack of funds and skills, such enterprises can not copy the ventilation ducts of large enterprises, so they urgently need to be developed, which is in line with the economic characteristics of small and medium-sized enterprises and has little investment. Low maintenance cost, suitable for sensitive, simple and practical ventilation skills.

通风管道在当今的承载物体中具有重要作用和地位，因此，管道的防腐保温处理日益受到重视，应用领域主要涉及：电子工业无尘厂房净化系统，医药食品无菌车间净化系统，酒店宾馆、医院、工厂及写字楼的中 央空调系统。

Ventilation duct plays an important role and position in today's load-bearing objects. Therefore, the anti-corrosion and thermal insulation treatment of duct has been paid more and more attention. The application fields mainly involve: the purification system of dust-free workshop in electronic industry, the purification system of sterile workshop of medicine and food, and the central air conditioning system of hotels, shopping malls, hospitals, factories and office buildings.