Reciprocating engine reduces exhaust volume

The exhaust temperature has little to do with the gas volume; it is related to the pressure ratio and the inlet temperature

It’s from the internet; see if it’s useful. Speed control: Speed control involves adjusting the exhaust volume by changing the speed of the compressor. The advantages of this type of regulation are continuous gas flow, lower power consumption, constant pressure ratios across all stages of the compressor, and no need for specialized control mechanisms on the compressor ； However, it is only widely used in compressors whose drive motors are internal combustion engines and turbines. If the drive motor is an electric motor, an inverter is required. Due to the high cost of high-power, high-voltage inverters as well as the extensive maintenance and repair work needed, this method is rarely used in reciprocating compressors driven by electric motors at present. Furthermore, variable speed regulation may have adverse effects on the operation of the compressor, such as valve flutter, increased component wear and vibration, as well as inadequate lubrication, which also limits the widespread use of this method. 2. Clearance chamber adjustment: On the compressor’s cylinders, in addition to the fixed clearance volume, there is another chamber. During adjustment, this chamber is connected to the working chamber of the cylinder, thereby increasing the clearance volume, reducing the volume coefficient, and lowering the displacement. This is the principle behind clearance chamber adjustment. Depending on the method of connecting to the supplementary volume, it is further divided into continuous, stepped, and intermittent regulation methods, which are commonly used in large-scale process compressors. The main drawback of this adjustment method is that it is usually done manually and has a slow response time; it generally needs to be used in combination with other adjustment methods. Although the method of connecting variable clearance volumes can in principle achieve adjustment within the 0% to 100% range, the system has poor reliability, many vulnerable components, and is difficult to maintain. 3. Bypass regulation: The exhaust pipe is connected to the intake pipe through a bypass pipeline and a bypass valve; to adjust it, simply open the bypass valve, and part of the exhaust gas will return to the intake pipeline. This adjustment method is relatively flexible and easy to implement; together with an automatic control system, it also offers high precision. However, since all the compression work required to compress the excess gas is lost, its economic efficiency is poor. Therefore, this method is suitable for occasional adjustments or those involving small amplitude adjustments. 4. Adjustment by pressing the intake valve: Based on the length of time the intake valve is pressed, this method is divided into two types – full-stroke pressing of the intake valve and partial-stroke pressing of the intake valve. In the case of full-stroke opening of the intake valve for adjustment, during the intake phase, gas is drawn into the cylinder; during the compression phase, with the intake valve fully open, the gas that has been drawn in is expelled from the cylinder. Assume a compressor has a single-stage double-acting cylinder. If the intake valve on only one side of the piston is opened, the air volume is reduced by 50%; if both sides are opened simultaneously, the exhaust volume becomes zero. Therefore, this compressor can achieve three levels of adjustment for air volume: 0%, 50%, and 100%. It can be seen that the adjustment range for fully pressing open the intake valve throughout the entire stroke is large, making it suitable for rough adjustment. The principle of adjusting by partially opening the intake valve is similar to that of fully opening it; however, by controlling the timing at which the intake valve closes during the compression stroke, it is possible to regulate the amount of gas returning, thereby achieving continuous control of the gas flow. Since the compression work decreases almost proportionally to the volume of exhaust gas, this approach also offers high operational efficiency.

This post was last edited by dugufeng on 2016-5-30 22:10. The displacement of a compressor has little to do with temperature; it is mainly related to the clearance. The clearance can be increased appropriately, or methods such as using bypass systems or adjusting air volume can be employed to reduce displacement. What is related to temperature is the compression ratio – the compression ratio for each stage is generally fixed and not suitable for modification

First, check the check valve and replace it with a new one; examine the one that has been removed to see if there are any leaks. Also, check the loading valve to ensure it is not stuck and that the load can be adjusted. From a process perspective, consider factors such as changes in the temperature of the process medium