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回轉曝氣風機在環保工藝

文章來源: 作者:羅茨機電 發布時間:2021-12-17 瀏覽次數:612

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一、水流速的問題

1、 The problem of water velocity

管道流速應控制在16m/s以下,流速越快,管網阻力越大,可能會導致鼓風機喘振,增加回轉式風機負荷。

The pipeline flow rate shall be controlled below 16m / s. The faster the flow rate, the greater the resistance of the pipe network, which may lead to surge of the blower and increase the load of the rotary fan.

二、曝氣回轉風機的質量

2、 Quality control of aeration rotary fan

在國內市場,曝氣機品種繁多,質量參差不齊,價格跨度大。由于缺乏相關的行業標準,作坊式生產方式普遍存在。例如,對橡膠曝氣機而言,每次所使用的原料及配料不盡相同,導致產品質量不穩定。例:碳黑添加過量,膠板就會硬化,阻力增大;碳黑添加不足,膠板太軟,則容易破裂;甚至還存在使用再生橡膠等情況。所以,非工業化生產的產品,其質量很難控制。如果曝氣機釋放量(釋放量與水深、壓力、流速、曝氣機膠膜質量均有關系)無法達到工藝要求,導致回轉式鼓風流量釋放率70%時,就會發生喘振及增加風機壓力。

In the domestic market, aerators have a wide variety, uneven quality and large price span. Due to the lack of relevant industry standards, workshop production mode is common. For example, for rubber aerators, the raw materials and ingredients used each time are different, resulting in unstable product quality. For example, if carbon black is added excessively, the rubber plate will harden and the resistance will increase; If the carbon black is not added enough and the rubber plate is too soft, it is easy to crack; There are even situations such as the use of recycled rubber. Therefore, the quality of non industrialized products is difficult to control. If the release amount of the aerator (the release amount is related to the water depth, pressure, flow rate and the quality of the rubber film of the aerator) cannot meet the process requirements, resulting in 70% release rate of the rotary blast flow, surge will occur and the fan pressure will be increased.

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三、止回閥的使用不同

3、 Check valves are used differently

各個生產廠家的止回閥中的拉簧硬度不一,局部阻力損失也就不同。如果總體管道阻力損失大于回轉式風機出口壓力,也會出現喘振?;剞D式風機停機時,需先關閉進口蝶閥,再關閉出口蝶閥,這完全可以避免倒水問題,不需安裝出口端止回閥。增加止回閥會加大阻力損失,增加設備成本和運行費用。

The hardness of the tension spring in the check valve of each manufacturer is different, and the local resistance loss is also different. Surge will also occur if the overall pipe resistance loss is greater than the outlet pressure of the rotary fan. When the rotary fan is shut down, it is necessary to close the inlet butterfly valve first and then the outlet butterfly valve, which can completely avoid the problem of water pouring, and there is no need to install the check valve at the outlet end. Increasing the check valve will increase the resistance loss and increase the equipment cost and operation cost.

四、環境溫度的變化

4、 Changes in ambient temperature

根據風機行業標準,回轉式風機設計氣溫為20℃,每升高1℃,出口壓力會下降20mmH2O左右。例如,夏季氣溫為38℃時,出口壓力就會下降360mmH2O。本公司根據我國大多數地區夏季普遍高溫的氣候特征,將回轉式風機進口端設計溫度提高至37℃,即相同軸功率下,出口端壓力比 標準高出340mmH2O。根據使用現場的具體情況,在進行回轉式風機的選型時,也要考慮氣溫變化對風機出口壓力的影響。當風機使用地日極限溫度37℃時,按20mmH2O/1℃對進氣端壓力進行補償。

According to the fan industry standard, the design temperature of the rotary fan is 20 ℃, and the outlet pressure will drop by about 20mmh2o every 1 ℃. For example, when the temperature is 38 ℃ in summer, the outlet pressure will drop by 360mmh2o. According to the climate characteristics of high temperature in most parts of China in summer, the company increases the design temperature at the inlet end of the rotary fan to 37 ℃, that is, under the phase coaxial power, the pressure at the outlet end is 340mmh2o higher than the national standard. According to the specific conditions of the use site, the influence of temperature change on the outlet pressure of the fan should also be considered when selecting the rotary fan. When the daily limit temperature of the fan is 37 ℃, the pressure at the inlet end shall be compensated according to 20mmh2o / 1 ℃.

五、海拔高度的變化

5、 Changes in altitude

回轉式風機設計壓力為98kpa(海拔高度150m,1atm)。當風機使用地點的海拔高度hgt;150m時,應在出口壓力和進口流量作適當補償,以保證設備正常運行。

The design pressure of the rotary fan is 98kpa (150m above sea level, 1atm). Altitude HGT of the place where the fan is used; At 150m, appropriate compensation shall be made for the outlet pressure and inlet flow to ensure the normal operation of the equipment.

六、并網的問題:

6、 Problems of grid connection:

二臺或多臺回轉式風機并網時,必須考慮并網增加的阻力。以往有的用戶在使用單臺風機時運轉正常,但二臺或多臺回轉式風機并網時出現空氣流量不足,電機電流上不去的現象,這與總體供氣能力、曝氣機布局、釋放能力是否同步、輸氣管道配置是否合理等因素有關。

When two or more rotary fans are connected to the grid, the increased resistance of grid connection must be considered. In the past, some users operated normally when using a single fan, but when two or more rotary fans were connected to the grid, the air flow was insufficient and the motor current could not go up, which was related to the overall gas supply capacity, whether the layout and release capacity of aerators were synchronized, and whether the configuration of gas transmission pipelines was reasonable.

七、并聯問題:

7、 Parallel problem:

污水處理風機放空閥的使用多臺風機并聯,只需安裝一個放空閥。鼓風機啟動時,若曝氣頭還未打通,可打開放空閥,放空部分氣體,使鼓風機達到一定的流量,待升壓平穩后再,關閉放空閥。這樣可以解決因低流量造成壓力上不去的喘振問題。

For the vent valve of sewage treatment fan, multiple fans are connected in parallel, and only one vent valve needs to be installed. When the blower is started, if the aeration head has not been opened, open the vent valve to vent some gas to make the blower reach a certain flow, and then close the vent valve after the pressure rise is stable. This can solve the surge problem caused by low flow.

八、管網阻力問題:

8、 Pipe network resistance:

如果鼓風機出口后管網阻力選用過高,打開進口閥門時,電動機電流會超過額定電流,這是因為回轉式風機做功壓力超出管網總體阻力的部分會轉化成空氣流量。在出口閥門全開狀態下,壓力表所示壓力不是風機的做功壓力,而是管網總體阻力。根據性能曲線圖,總體阻力降低,流量就會相應加大,電流也就加大。此時只要將出口閥門關小,增加人為阻力,使出口端壓力表達到額定壓力,電流就會正常。關小出口閥門目的是截流超負荷流量,回轉式風機額定流量不會減小,只是增快了流速。

If the resistance of the pipe network behind the outlet of the blower is too high, when the inlet valve is opened, the motor current will exceed the rated current, because the part of the work pressure of the rotary fan exceeding the overall resistance of the pipe network will be converted into air flow. When the outlet valve is fully open, the pressure shown on the pressure gauge is not the work pressure of the fan, but the overall resistance of the pipe network. According to the performance curve, if the overall resistance decreases, the flow will increase accordingly and the current will increase. At this time, as long as the outlet valve is turned down, the artificial resistance is increased, and the pressure at the outlet end is expressed to the rated pressure, the current will be normal. The purpose of closing the outlet valve is to stop the overload flow. The rated flow of the rotary fan will not decrease, but increase the flow rate.

九、效率問題:

9、 Efficiency issues:

不管是哪種類型的曝氣回轉式風機,其效率都是相對的,在實際運行中不可能總是保持更高 效率,任何增加的阻力(如閥門、管道彎頭、曝氣器阻力)都會使效率降低。所以保持回轉式風機高效率運行,和工藝流程設計是密不可分的。

No matter what type of aeration rotary fan, its efficiency is relative. It is impossible to always maintain the highest efficiency in actual operation. Any increased resistance (such as valve, pipe elbow and aerator resistance) will reduce the efficiency. Therefore, maintaining high-efficiency operation of the rotary fan is inseparable from process design.


相關文章: 陜西離心式風機廠家 凈化器 氣力輸送設備廠家 油煙 甘肅回轉風機廠家

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