38 results about "Excess nitrogen" patented technology

A blast furnace where coke is combusted with oxygen, instead of air, and where a top gas comprising CO, CO2, H2, and without excess nitrogen is withdrawn from the upper part of the blast furnace, cleaned of dust, the H2 / CO volume ratio adjusted to between 1.5 to 4.0 in a water shift reactor, water and CO2 are removed (increasing its reduction potential), heated to a temperature above 850° C. and fed back to the blast furnace above where iron starts melting (thereby increasing the amount of metallic iron reaching the dead-man zone and decreasing the amount of coke used for reduction). Also carbon deposit problems caused by heating the CO-containing recycled gas are minimized by on-line cleaning of the heater tubes with steam without significantly affecting the reduction potential of the recycled reducing gas.

Produced natural gas containing carbon dioxide is dehydrated and chilled to liquefy the carbon dioxide and then fractionated to produce a waste stream of liquid carbon dioxide and hydrogen sulfide. Natural gas liquids may be first separated and removed before fractionation. After fractionation, the waste stream is pressurized and transmitted to a remote injection well for injection either for disposal of the waste stream and preferably to urge hydrocarbons toward the producing well. A hydrocarbon stream proceeds from fractionation to a methanol absorber system which removes carbon dioxide gas. The hydrocarbon stream is thereafter separated into at least hydrocarbon gas, nitrogen and helium. Some of the nitrogen is reintroduced into a fractionation tower to enhance the recovery of hydrocarbons. A methanol recovery system is provided to recover and reuse the methanol. The hydrocarbons are sold as natural gas and the helium is recovered and sold. Excess nitrogen is vented.

A system and method for removing nitrogen from an intermediate stream in a gas subcooled process operation that processes natural gas into a sales gas stream and a natural gas liquids stream. The system and method of the invention are particularly suitable for use with gas subcooled process operations where the sales gas stream exceeds pipeline nitrogen specifications by up to about 3%, such as for reducing the nitrogen content of sales gas streams to levels permissible for pipeline transport.

The invention relates to a water-flush formula fertilizer special for a Chinese herbal medicine Andrographis paniculata. The fertilizer comprises the following effective elements by weight: 23.0-28% of nitrogen; 6.0-10.0% of phosphor, measured in P2O5; 10.0-15.0% of potassium, measured in K2O; 1.2-3.5% of sulfur, measured in SO4<2->; 0.2-1.0% of zinc, measured in ZnO; 0.5-1.3% of manganese, measured in MnO; and 2.1-5.6% of calcium, measured in CaO. The fertilizer of the invention is a formula fertilizer special for Andrographis paniculata and other Chinese herbal medicines, and is also suitable for field water-flush appilication. Combining irrigation and fertilization, the fertilizer in the invention has complete nutrient component, rational nutrient proportioning and high fertilizer utilization rate, and is in line with the nutrient absorption rules of Andrographis paniculata and other Chinese herbal medicines. The fertilizer provided in the invention can promote the growth and development of Andrographis paniculata, increase output and economic benefits, raise drug effect component content like andrographolide, and can simultaneously reduce the unfavorable influences to the environment as a result of excess nitrogen application or improper fertilization, thus mitigating environmental pollution and protecting the environment.

The invention discloses a method for removing nitrogen and phosphorus from water by using calcium silicate prepared from silicon recycled from red mud, and relates to a method for removing nitrogen and phosphorus from water. By the method, the problems of waste resource utilization and removal of excess nitrogen and phosphorus from water are solved. The method comprises the following steps: leaching most of metal oxides from the red mud by using dilute hydrochloric acid first and then leaching titanium and rare earth elements from the red mud by using concentrated sulfuric acid so as to leave silicon dioxide powder, and then preparing the extracted silicon dioxide into calcium silicate by a hydrothermal method. A certain amount of calcium silicate is added into waste water containing nitrogen and phosphorus, the waste water is oscillated at a certain temperature, ammonia nitrogen is removed from water through gas-liquid separation, and phosphorus is removed from water through ligand exchange and chemical precipitation.