LNG point supply odorizing device

Abstract

The invention belongs to the technical field of an LNG point supply mini gas flow odorizing device in the project of changing fuel from coal to natural gas, in particular relates to an LNG point supply odorizing device. The invention provides an LNG point supply odorizing device with continuous, accurate and safe odorizing, which comprises a pulse period compensation controller, a gas flow meter, an odorant storage tank, an odorizing pump, a lower non-return valve, an upper non-return valve, an odorizing pipeline and a retaining valve, wherein the detection signal pulse input port of the pulse period compensation controller is connected with the detection signal pulse output port of the gas flow meter, the control signal output port of the pulse period compensation controller is connected with the control signal input port of the odorizing pump; the inlet of the odorizing pump is connected with the outlet of the odorant storage tank via the lower non-return valve, the outlet of the odorizing pump is connected with the odorizing pipeline via the upper non-return valve, and the outlet of the odorizing pipeline is connected with a gas pipe via the retaining valve.

Description

technical field [0001] The invention belongs to the technical field of an LNG point supply odorizing device for a small gas flow in a coal-to-gas project, and in particular relates to an LNG point supply odorization device. Background technique [0002] The use of natural gas clean energy to replace coal-fired engineering projects is a basic national policy of the Chinese government to reduce carbon dioxide emissions, improve air quality, protect the ecological environment, and improve people's quality of life. As a project benefiting the people and blue sky environmental protection project of the government, all LNG point supply equipment meets the requirements of low-cost, high-performance, safe and reliable equipment. [0003] Natural gas is very environmentally friendly and convenient to use as a clean energy source. However, natural gas is a flammable and explosive gas. Once leaked, it is likely to cause fire or explosion accidents. Adequate safety measures must be take...

AI Technical Summary

Problems solved by technology

[0011] During the actual operation of the odorizing equipment, the gas flow will continue to change. In some cases, the LNG point supply station only uses dozens of cubic meters of gas per day. In many cases The gas consumption is concentrated in the morning, afternoon and evening meals, and the gas flow is very small at other times, and only 1m3 gas flow passes through in a few hours. In this case, the gas flow meter can only output 3.96 The analog current signal of about mA ~ 4.04mA basically belongs to the phenomenon of zero point drift. The conventional controller will not output an accurate and effective action signal of the odorizing pump when receiving such a signal value, and the stopping time of the odorizing pump will be very long, up to 10 Up to 12 hours, no odorant is added to the gas flowing under this operating condition

[0012]On the other hand, if the odorizing pump does not move for a long time in the odorizing equipment, the back leakage of the one-way valve will be more obvious, and the odorizing equipment remaining in the pipeline of the odorizing equipment will The agent will be pushed back partly by the gas, and it may also be pushed back to the odorant pump, and the worst is pushed back into the odorant storage tank, and the mixed gas of gas and odorant is exhausted from the pressure relief port of the storage tank

When this happens, the surrounding environment will be polluted, and there will also be potential safety hazards. When the odorizing equipment moves again to output, because the inside of the odorizing pump is completely filled with gas, there is no liquid odorant, and the odorizing pump cannot output no matter how high the operating frequency is. odorant

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