36results about How to "Stable operating pressure" patented technology

The invention provides a method for preparing aliphatic polycarbonate through a continuous solution polymerization method. The method comprises the following steps of a, injecting an epoxy monomer, carbon dioxide and catalyst into a circulation flow reactor through a continuous way, utilizing a circulation pump to provide power for the reaction materials, circularly returning partial reaction materials to the circulation flow reactor, driving one part of the reaction materials to leave the circulation flow reactor at a speed being identical to the feeding speed to enter a tubular reactor with a built-in static mixer; b, controlling the retention time of the pulp in the tubular reactor through the ratio of the pipe length and the flowing linear speed of the reaction materials, and gradually charging a solvent step by step through a plurality of feeding ports along the length of the tubular reactor; c, feeding an end sealing agent and a stabilizer through a feeding port on the tail end of the tubular reactor to carry out the in-situ chemical or physical modification; d, ensuring the reaction endpoint pulp which continuously flows out of a discharging end to enter a middle-pressure flash evaporator, carrying out the flash evaporation by utilizing the reaction pressure, removing the solvent, and returning the pulp to the tubular reactor after the pulp is condensed; and e, devolatilizing and drying the pulp to obtain a polymerization product.

The invention discloses a natural-gas flow-temperature helium extracting system and a natural-gas flow-temperature helium extracting method. According to the system and the method, the post-expansion and nitrogen circulating refrigerating two-column separating technology is carried out for fully recovering the cooling capacity of the device in order to pre-cool the natural gas which serves as the raw material, and thereby the system can be applied to the natural gas which has an extremely low content of helium, and has the characteristics of being low in energy consumption, high in helium recovery rate, small in investment, flexible in operation, and high in adaptability to variable working conditions. The system and the method have the positive effects that little helium in the helium-containing natural gas can be extracted by a pre-cooling system and a low-temperature rectifying system, an independent nitrogen circulating refrigerating system is adopted and used for supplying an ultralow-temperature cold source required in helium concentration, and the independent system is rich in adjusting means and cannot be influenced by upstream operations; and a post-expansion refrigerating system is adopted, so that the natural-gas low-temperature helium extracting system has the operation pressure higher than that in conventional technology, and higher concentration of the helium can also be obtained at the same refrigerating temperature.

The invention mainly relates to a reverse-osmosis and ultra-filtration scale inhibitor with the wide suitable salinity range. The inhibitor has the good scale inhibition effect within the wide ionic strength range, and is prepared from one or more of amino trimethylene phosphonic acid (ATMP), phosphono-carboxylic acid (POCA), polyaspartic acid (PASP) and polyamino polyether methylene phosphonate (PAPEMP); by means of the reverse-osmosis and ultra-filtration scale inhibitor, membrane face scaling can be effectively prevented, fouling of a membrane is prevented, and the service life of a membrane system is prolonged. The working pressure and the water production efficiency of the membrane system are kept, and it is prevented that due to fouling, energy consumption of the system is increased. According to the reverse-osmosis and ultra-filtration scale inhibitor with the wide suitable salinity range, the reverse-osmosis scale inhibitor can be suitable for the wide water-quality salinity range (electric conductance is 0 microsecond to 30,000 microseconds) through compounding, and the using effect of the reverse-osmosis inhibitor can be guaranteed within the range.

The invention belongs to the field of new energy, and particularly relates to a six-tank circulating type marsh gas double-path SOFC anode fuel supply system. Crop straw is adopted as raw materials of the system, six fermentation tanks are designed to enter a marsh gas production period in sequence, two fermentation tanks are kept supplying marsh gas at the same time, and the output flow of the two fermentation tanks is kept to be output in a staggering peak mode. The SOFC anode fuel supply system is designed into a double-path supply system, namely, an A-path system and a B-path system. The A-path system and the B-path system alternately bear a work state and a maintenance and standby state. When a certain device in the anode fuel supply system in the work state breaks down, a corresponding device in the system in the maintenance and standby state is immediately switched to replace the device breaking down to work. The SOFC anode fuel supply system has the advantage of being large and stable in marsh gas supply flow, the needs of SOFC generated power for continuous supplying to the anode fuel supply system are met.

The invention discloses a forward and reverse double-flow calcium carbonate filter in the field of industrial water treatment. The structure includes a water pump, a three-way diverter, a calcium carbonate filter column, a submerged elbow with a cover, a gate valve, a check valve, and a casing. The filter can be filtered according to the conventional calcium carbonate filter in the downstream mode, or it can be filtered in a better countercurrent mode by turning on the water pump, which increases the fault tolerance rate of the entire system and can bring out the air bubbles remaining in the filter, ensuring The filter works under a constant pressure to ensure the water flow rate and filtering effect.