負(fù)壓指利用壓風(fēng)機(jī)（真空泵）產(chǎn)生系統(tǒng)負(fù)壓，將在受料器處與空氣均勻混合的粉粒狀物料通過管道抽送至貯料裝置的輸送系統(tǒng)，主要用于燃煤電廠的灰處理系統(tǒng)，又稱負(fù)壓氣力除灰系統(tǒng)，為國外引進(jìn)技術(shù)，其系統(tǒng)設(shè)計(jì)技術(shù)已為國內(nèi)除灰系統(tǒng)設(shè)計(jì)人員完全掌握。

　　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.

　　負(fù)壓氣力輸送系統(tǒng)投資較省，可以多點(diǎn)受料，要求灰斗下部的凈空較小，適用于300MW及以下火電機(jī)組的除灰系統(tǒng)，且由于設(shè)備和管路在真空狀態(tài)下只能發(fā)生內(nèi)泄漏，因而環(huán)境比較清潔。缺點(diǎn)是由于負(fù)壓值有限，因而輸送距離較短，一般輸送的幾何距離為200m，實(shí)際工程宜按≤150m設(shè)計(jì)；單個(gè)系統(tǒng)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).

　　負(fù)壓通常由物料輸送閥、進(jìn)氣止回閥、輸送管道及閥門、灰氣別離設(shè)備、貯灰?guī)旒拜o佐設(shè)備、負(fù)壓風(fēng)機(jī)和操控設(shè)備等構(gòu)成。物料輸送閥又稱E形閥，作為受料器的輸送閥是負(fù)壓設(shè)備的關(guān)鍵設(shè)備之一，其作用是經(jīng)過物料輸送閥上的補(bǔ)氣閥和灰量調(diào)理設(shè)備的作業(yè)，使灰斗內(nèi)的灰與空氣均勻混合，灰氣混合物具有杰出的流動(dòng)性，可使其順暢進(jìn)入輸送管道，以確保輸送設(shè)備高效、曉暢地運(yùn)轉(zhuǎn)。物料輸送選用氣支操控，其閥體和閥具有杰出的耐磨性。

　　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.

　　進(jìn)氣止回閥選用旋啟式構(gòu)造，當(dāng)輸送管道內(nèi)濃度過高造成輸送支管進(jìn)氣端真空值過高時(shí)，進(jìn)氣止回閥主動(dòng)打開，補(bǔ)人適當(dāng)?shù)目諝庖韵♂屵^高的物料濃度，以避免堵管的發(fā)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.

　　負(fù)壓指利用壓風(fēng)機(jī)（真空泵）產(chǎn)生系統(tǒng)負(fù)壓，將在受料器處與空氣均勻混合的粉粒狀物料通過管道抽送至貯料裝置的輸送系統(tǒng)，主要用于燃煤電廠的灰處理系統(tǒng)，又稱負(fù)壓氣力除灰系統(tǒng)，為國外引進(jìn)技術(shù)，其系統(tǒng)設(shè)計(jì)技術(shù)已為國內(nèi)除灰系統(tǒng)設(shè)計(jì)人員完全掌握。

　　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.

　　負(fù)壓氣力輸送系統(tǒng)投資較省，可以多點(diǎn)受料，要求灰斗下部的凈空較小，適用于300MW及以下火電機(jī)組的除灰系統(tǒng)，且由于設(shè)備和管路在真空狀態(tài)下只能發(fā)生內(nèi)泄漏，因而環(huán)境比較清潔。缺點(diǎn)是由于負(fù)壓值有限，因而輸送距離較短，一般輸送的幾何距離為200m，實(shí)際工程宜按≤150m設(shè)計(jì)；單個(gè)系統(tǒng)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).

　　負(fù)壓通常由物料輸送閥、進(jìn)氣止回閥、輸送管道及閥門、灰氣別離設(shè)備、貯灰?guī)旒拜o佐設(shè)備、負(fù)壓風(fēng)機(jī)和操控設(shè)備等構(gòu)成。物料輸送閥又稱E形閥，作為受料器的輸送閥是負(fù)壓設(shè)備的關(guān)鍵設(shè)備之一，其作用是經(jīng)過物料輸送閥上的補(bǔ)氣閥和灰量調(diào)理設(shè)備的作業(yè)，使灰斗內(nèi)的灰與空氣均勻混合，灰氣混合物具有杰出的流動(dòng)性，可使其順暢進(jìn)入輸送管道，以確保輸送設(shè)備高效、曉暢地運(yùn)轉(zhuǎn)。物料輸送選用氣支操控，其閥體和閥具有杰出的耐磨性。

　　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.

　　進(jìn)氣止回閥選用旋啟式構(gòu)造，當(dāng)輸送管道內(nèi)濃度過高造成輸送支管進(jìn)氣端真空值過高時(shí)，進(jìn)氣止回閥主動(dòng)打開，補(bǔ)人適當(dāng)?shù)目諝庖韵♂屵^高的物料濃度，以避免堵管的發(fā)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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