One-key start-stop purification system adopting biogas water washing method and method

Abstract

The invention discloses a one-key start-stop purification system adopting a biogas water washing method and a method. The one-key start-stop purification system comprises a first buffer tank, a biogascompressor, an absorption tower, a first-stage analysis tower, a second-stage analysis tower, a dewatering device, a second buffer tank, an air blower and a technology water pump which are sequentially connected through pipelines; and the one-key start-stop purification system further comprises a monitoring assembly, a moving assembly and a PLC, the output end of the monitoring assembly is connected with the input end of the PLC, and the output end of the PLC is connected with the input end of the moving assembly. By adding equipment one-key start-stop control and adding pressure automatic control, product quality automatic control, alarm interlocking start-stop control and liquid level dynamic control, realization of equipment one-key start-stop of the biogas purification system is promoted and perfected. According to the one-key start-stop purification system, ordered one-key start-stop of equipment is realized through logic programs set in the PLC or a DCS, the whole purification system is remotely operated completely, and the safety and stability of system operation are also greatly improved.

Description

technical field [0001] The invention relates to the technical field of biogas purification, in particular to a biogas water washing purification system and method with one-key start-stop. Background technique [0002] At present, the proportion of biogas purification in the total energy of some countries in Western Europe (Germany, Denmark, Sweden, etc.) is about 10%. Biogas purification technologies, such as pressurized water washing, chemical absorption, pressure swing adsorption and membrane separation, have been commercialized. Among them, pressurized water washing and pressure swing adsorption have the highest utilization rate in the European biogas purification market, each accounting for 1 / 3. [0003] In China, biogas purification technology has gradually emerged in recent years, but the main purification processes, including desulfurization, decarbonization and dehydration, have been widely used and mature in industrial gas purification projects such as synthetic am...

AI Technical Summary

Problems solved by technology

[0004] Compared with the pressure swing adsorption process, the pressure water washing method is easy to operate, but the investment is relatively large, the requirement for biogas pretreatment is high, and the recovery rate of methane is low; the pressure water washing method has the advantages of high purity and high recovery rate of methane , the investment is relatively low, and the requirements for biogas pretreatment are low, but due to the need for multiple systems to be linked, the operation process is relatively complicated

[0005] As the biogas water washing process itself, due to the need to use a centrifugal pump with high lift and large flow, direct start-up will cause excessive flow, resulting in over-current operation or burning of the motor. It needs to be started manually with the valve closed on the spot, and remote operation and operation cannot be safely realized. Automatic control; the working pressure of the purification system depends on the amount of the gas filling station at the back end of the product gas. When the amount is too fast, the working pressure of the absorption tower may be too low to achieve the purification effect. Sections are vented through shutdown, manual venting or automatic venting by safety valves, resulting in complex operations, waste and safety hazards; too high a height of the water storage section of the tower will lead to an increase in the height of the equipment, which in turn will result in increased costs and reduced stability; It is easy to cause the process water circulation to be difficult to adjust, and the liquid retention of the packing layer and the pipeline will also cause drastic changes and fluctuations in the system liquid level before and after the pump starts and stops

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