负压指利用压风机（真空泵）产生系统负压，将在受料器处与空气均匀混合的粉粒状物料通过管道抽送至贮料装置的输送系统，主要用于燃煤电厂的灰处理系统，又称负压气力除灰系统，为国外引进技术，其系统设计技术已为国内除灰系统设计人员完全掌握。

　　Negative pressure refers to the use of a pressure fan (vacuum pump) to generate negative pressure in the system, which pumps the powder and granular materials uniformly mixed with air at the receiver through pipelines to the conveying system of the storage device. It is mainly used in the ash treatment system of coal-fired power plants, also known as negative pressure pneumatic ash removal system. This technology has been introduced from abroad, and its system design technology has been fully mastered by domestic ash removal system designers.

　　负压气力输送系统投资较省，可以多点受料，要求灰斗下部的净空较小，适用于300MW及以下火电机组的除灰系统，且由于设备和管路在真空状态下只能发生内泄漏，因而环境比较清洁。缺点是由于负压值有限，因而输送距离较短，一般输送的几何距离为200m，实际工程宜按≤150m设计；单个系统的出力一般40t/h的（粉煤灰）。

　　The negative pressure pneumatic conveying system has a relatively low investment and can receive materials from multiple points. It requires a small net clearance at the bottom of the ash hopper and is suitable for ash removal systems of 300MW and below thermal power units. Additionally, due to the fact that equipment and pipelines can only experience internal leakage under vacuum conditions, the environment is relatively clean. The disadvantage is that due to the limited negative pressure value, the conveying distance is relatively short. Generally, the geometric distance of conveying is 200m, and practical engineering should be designed as ≤ 150m; The output of a single system is generally 40t/h (fly ash).

　　负压通常由物料输送阀、进气止回阀、输送管道及阀门、灰气别离设备、贮灰库及辅佐设备、负压风机和操控设备等构成。物料输送阀又称E形阀，作为受料器的输送阀是负压设备的关键设备之一，其作用是经过物料输送阀上的补气阀和灰量调理设备的作业，使灰斗内的灰与空气均匀混合，灰气混合物具有杰出的流动性，可使其顺畅进入输送管道，以确保输送设备高效、晓畅地运转。物料输送选用气支操控，其阀体和阀具有杰出的耐磨性。

　　Negative pressure is usually composed of material conveying valves, intake check valves, conveying pipelines and valves, ash and gas separation equipment, ash storage and auxiliary equipment, negative pressure fans, and control equipment. The material conveying valve, also known as the E-shaped valve, is one of the key devices of negative pressure equipment as the conveying valve of the receiver. Its function is to evenly mix the ash in the ash hopper with the air through the operation of the air supply valve on the material conveying valve and the ash adjustment equipment. The ash air mixture has excellent fluidity, which can smoothly enter the conveying pipeline to ensure the efficient and smooth operation of the conveying equipment. The material conveying is controlled by pneumatic support, and its valve body and valve have excellent wear resistance.

　　进气止回阀选用旋启式构造，当输送管道内浓度过高造成输送支管进气端真空值过高时，进气止回阀主动打开，补人适当的空气以稀释过高的物料浓度，以避免堵管的发作。

　　The intake check valve adopts a rotary opening structure. When the concentration in the conveying pipeline is too high, causing the vacuum value at the intake end of the conveying branch pipe to be too high, the intake check valve will actively open and supply appropriate air to dilute the excessive material concentration, in order to avoid the occurrence of pipe blockage.

　　负压指利用压风机（真空泵）产生系统负压，将在受料器处与空气均匀混合的粉粒状物料通过管道抽送至贮料装置的输送系统，主要用于燃煤电厂的灰处理系统，又称负压气力除灰系统，为国外引进技术，其系统设计技术已为国内除灰系统设计人员完全掌握。

　　Negative pressure refers to the use of a pressure fan (vacuum pump) to generate negative pressure in the system, which pumps the powder and granular materials uniformly mixed with air at the receiver through pipelines to the conveying system of the storage device. It is mainly used in the ash treatment system of coal-fired power plants, also known as negative pressure pneumatic ash removal system. This technology has been introduced from abroad, and its system design technology has been fully mastered by domestic ash removal system designers.

　　负压气力输送系统投资较省，可以多点受料，要求灰斗下部的净空较小，适用于300MW及以下火电机组的除灰系统，且由于设备和管路在真空状态下只能发生内泄漏，因而环境比较清洁。缺点是由于负压值有限，因而输送距离较短，一般输送的几何距离为200m，实际工程宜按≤150m设计；单个系统的出力一般40t/h的（粉煤灰）。

　　The negative pressure pneumatic conveying system has a relatively low investment and can receive materials from multiple points. It requires a small net clearance at the bottom of the ash hopper and is suitable for ash removal systems of 300MW and below thermal power units. Additionally, due to the fact that equipment and pipelines can only experience internal leakage under vacuum conditions, the environment is relatively clean. The disadvantage is that due to the limited negative pressure value, the conveying distance is relatively short. Generally, the geometric distance of conveying is 200m, and practical engineering should be designed as ≤ 150m; The output of a single system is generally 40t/h (fly ash).

　　负压通常由物料输送阀、进气止回阀、输送管道及阀门、灰气别离设备、贮灰库及辅佐设备、负压风机和操控设备等构成。物料输送阀又称E形阀，作为受料器的输送阀是负压设备的关键设备之一，其作用是经过物料输送阀上的补气阀和灰量调理设备的作业，使灰斗内的灰与空气均匀混合，灰气混合物具有杰出的流动性，可使其顺畅进入输送管道，以确保输送设备高效、晓畅地运转。物料输送选用气支操控，其阀体和阀具有杰出的耐磨性。

　　Negative pressure is usually composed of material conveying valves, intake check valves, conveying pipelines and valves, ash and gas separation equipment, ash storage and auxiliary equipment, negative pressure fans, and control equipment. The material conveying valve, also known as the E-shaped valve, is one of the key devices of negative pressure equipment as the conveying valve of the receiver. Its function is to evenly mix the ash in the ash hopper with the air through the operation of the air supply valve on the material conveying valve and the ash adjustment equipment. The ash air mixture has excellent fluidity, which can smoothly enter the conveying pipeline to ensure the efficient and smooth operation of the conveying equipment. The material conveying is controlled by pneumatic support, and its valve body and valve have excellent wear resistance.

　　进气止回阀选用旋启式构造，当输送管道内浓度过高造成输送支管进气端真空值过高时，进气止回阀主动打开，补人适当的空气以稀释过高的物料浓度，以避免堵管的发作。

　　The intake check valve adopts a rotary opening structure. When the concentration in the conveying pipeline is too high, causing the vacuum value at the intake end of the conveying branch pipe to be too high, the intake check valve will actively open and supply appropriate air to dilute the excessive material concentration, in order to avoid the occurrence of pipe blockage.

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