39results about How to "Reduce recirculation air volume" patented technology

The invention relates to a method of producing substitute natural gas from synthesis gas, mainly solving problems, namely large using amount of recycle gas, high energy consumption of compressors and short service lifetime of catalysts, of high-temperature methanation reactions in the prior art. According to the technical scheme adopted by the method, the method comprises: a) a step of providing a high-temperature methanation reaction zone including n-stage series-connected reactors, wherein the n is not less than 2, each reactor is divided into m sections of catalyst layers and the m is not less than 2; b) a step of dividing the synthesis gas raw materials into n sections and respectively feeding the n sections of the synthesis gas raw materials into inlets of the reactors at all stages in the high-temperature methanation reaction zone, wherein each section of the synthesis gas raw materials that enters a reactor is then divided into m streams and the m streams respectively enter the corresponding catalyst layers; c) a step of allowing a stream flowing out of an outlet of each of the reactors except the reactor at the final stage to enter the first section of catalyst layer in the reactor at the next stage; and d) a step of shunting the stream Vn flowing out from the reactor at the final stage to obtain a part Vn', and circulating the stream Vn' after the Vn' is condensed to the inlet of the reactor at the first stage. By the technical scheme, the problems are solved well and the method can be used in industrial production of substitute natural gas from synthesis gas.

The invention discloses an energy-saving technology for producing melamine by a one-step method, mainly comprising the following steps: supplying heat to a fluidized bed reactor by a superconducting liquid heating furnace or a heat pipe heating furnace; cooling produced gas-state melamine and a high-temperature mixed gas of ammonia and carbon dioxide by a heat pipe exchanger; and then filtering, crystallizing and separating to obtain a finished product solid melamine, wherein the rest mixed gas of the ammonia and the carbon dioxide can be circularly used for supplying a working gas for a system after being purified and can also enter a synthesis ammonia soda ash device or a synthesis ammonia ammonium carbonate device or a synthesis ammonia nitramine device to be used for supplying a raw material for the system. Compared with the traditional one-step method, the energy-saving technology can reduce the fuel consumption by 40 percent and the electric power consumption by 30 percent.

A hydrogen shaft furnace ironmaking system and method using electric energy heating, the system includes a water electrolyzer, a hydrogen storage tank, an electric energy heating hydrogen shaft furnace, a heat exchanger, and a gas mixing tank; the furnace body is provided with a microwave heating section, a middle section, The induction heating section, the cooling section and the screw discharger, the air inlet pier is below the cooling section, and the water electrolyzer, hydrogen storage tank, heat exchanger, gas mixing tank are connected with the air inlet of the air inlet pier in sequence. The method is as follows: (1) The hydrogen gas generated by the electrolysis of the water electrolyzer is passed into the hydrogen storage tank; (2) The hydrogen gas is passed into the coil in the heat exchanger, discharged into the gas mixing tank, and passed into the furnace body through the air inlet pier; (3) Turn on the microwave radiation source and the induction coil; (4) Put the iron-containing material into the furnace body to exchange heat with the gas and undergo a reduction reaction; (5) After the iron-containing material passes through each section of the furnace body, it will generate direct reduced iron and discharge it. The method of the present invention avoids oxygen blowing at the upper part, can realize the direct recovery and utilization of part of the high-temperature tail gas on the top of the furnace, reduces energy consumption and operation cost, and can avoid pipeline material failure and other related safety accidents caused by hydrogen diffusion.

The invention discloses a reaction device for preparing mixed aromatics from methanol. The reaction device comprises a methanol evaporator, a reactor body, a compressor, a gas heat exchanger and a gas-liquid separator, wherein the methanol evaporator is connected to the reactor body through a pipeline; the reactor body is connected to an inlet of the gas heat exchanger through a pipeline; an outlet of the gas heat exchanger is connected to an inlet of the gas-liquid separator through a pipeline; an outlet of the gas-liquid separator is connected to an inlet of the compressor; an outlet of the compressor is connected to the methanol evaporator; a heating unit is arranged in the reactor body and is a heat pipe type heat exchanger. According to the reaction device, the structure is simple, the cost is lowered, and the heat energy is recovered; the low-power compressor is adopted for bringing out heat in the reactor body, so that the electrical energy is saved and the service life of the compressor is prolonged.

The invention relates to a method of producing substitute natural gas by methanation of synthesis gas, mainly solving problems, namely large using amount of recycle gas and high energy consumption of compressors, of high-temperature methanation reactions in the prior art. According to the technical scheme adopted by the method, the method comprises: a) a step of providing a high-temperature methanation reaction zone including n-stage series-connected reactors, with the n being not less than 2; b) a step of dividing the synthesis gas raw materials containing H2, CO, CO2 and H2O into n sections and respectively feeding the n sections of the synthesis gas raw materials into inlets of the reactors at all stages in the high-temperature methanation reaction zone, wherein a stream flowing out of an outlet of each of the reactors except the reactor at the final stage enters the inlet of the reactor at the next stage, the stream Vn flowing out from the reactor at the final stage is divided into Vn' and Vn'', and the stream Vn' is condensed and circulated to the inlet of the reactor at the first stage; c) a step of providing a low-temperature methanation reaction zone including m-stage series-connected reactors, with the m being not less than 2; and d) a step of feeding the stream Vn'' into the low-temperature methanation reaction zone, and substitute natural gas is obtained after the reaction. By the technical scheme, the problems are solved well and the method can be used in industrial production of the substitute natural gas from the synthesis gas.