Purification and treatment unit of pyrolysis syngas
Our patented design is characterized in that: a gas-liquid mixing chamber and a multifunctional separator capable of separating solid, liquid and gas, wherein the inlet of the gas-liquid mixing chamber is connected with the corrosive gas outlet of the pyrolysis reactor, and the outlet of the gas-liquid mixing chamber is connected with the multifunctional separator; the multifunctional separator comprises a cavity body, in which a solvent is arranged, and the solvent passes through a circulation device, which is connected with the injection hole of the gas-liquid mixing chamber, and the cavity body is also provided with at least one solid sewage outlet and at least one clean gas outlet. In the design, a solvent tank is also included, which is connected with the cavity of the multifunctional separator through a pipeline. In the design, a gas storage tank is also included, the inlet of the gas storage tank is connected with the clean gas outlet of the multifunctional separator, and the outlet of the gas storage tank is connected with the combustion system of the pyrolysis reactor.
In a preferred case, the gas-liquid mixing chamber adopts a spray type or “Venturi” type system.
In a preferred case, a check valve is arranged between the corrosive gas outlet and the gas-liquid mixing chamber.
In a preferred case, the cavity of the multifunctional separator is provided with one or more baffles for solid-liquid separation.
In a preferred case, two ends of the multifunctional separator are respectively provided with an air cavity and a gas-liquid separator, and the gas cavity is connected with the gas-liquid mixing chamber.
In a preferred case, the packing types in the gas-liquid separator are regular packing, stacking packing, baffle plate, etc.
In a preferred case, the multifunctional separator is also provided with a vent, a liquid level gauge and an online pH value detection and regulation system.
The solid waste is sent to the pyrolysis reactor through a feeding system, and then heated by the combustion system, the gas phase passes through a gas-solid separator, rectifying tower and condensation system; the non condensable gas without condensation enters the mixing chamber through the check valve and then enters the multi-functional separator; this process can form a negative pressure state and react with corrosive gases in the mixing chamber. The non condensable gas in the thermal cracking system is mixed in the Venturi or spray chamber of circulating water through the solvent circulation system, and the corrosive substances are removed. Then, the non condensable gas is brought into the multi-functional separator at the lower end to form the micro negative pressure state of the thermal cracking system. In the multi-function separator, the non condensable gas is separated from the impurities after reaction through the separator; the gas passes through the gas-liquid separation section and becomes relatively clean, it will enter the rear gas storage tank, and then it can enter the combustion system to make up fuel combustion.
Compared with the prior design, this design has the following outstanding advantages:
1) In the process of forming micro negative pressure, the harmful materials of pyrolysis gas are solved, the service life of production equipment is prolonged and the environment is optimized.
2) Due to the special solvent added in the mixing chamber, the reacction between solvent and harmful materials of pyrolysis gases forms negative pressure in the mixing chamber, forming cavitation effect and strengthening the mass transfer effect of corrosive gas and solvent, so the reaction speed is faster and more thorough;
3) In this design, the gas inlet connected with the pyrolysis reactor and the gas outlet connected with the gas storage tank are divided into two parts by the solvent, and the two parts are divided into independent process system parts, so the safety is improved.
4) After purification, the pyrolysis gases become more pure, which can effectively reduce the toxicity of flue gas and the formation of pollutants in the combustion process of pyrolysis gases.
