78results about How to "Increase return flow" patented technology

A valve assembly that includes a valve body defining a fluid passage. First and second ends of the fluid passage define first and second ports for fluid flow. A spring and piston are located in the fluid passage. The piston has a travel length extending between first and second positions with a third position located therebetween. The spring biases the piston from the first toward the third position and is located outside the axial piston passage. The piston at least partially defines a first, second and at least one third opening. The first opening defines a variable constriction which increases in size as the piston moves from the first to third positions. The piston end wall defines the second opening and the piston sidewall defines the third openings. Movement of the piston from the third to second position exposes the third openings increasing the area of the second port.

The inventions relates to a feed screw for eccentric screw pumps which, to avoid bridge formation of the medium and optimisation of the drive power, has a screw, which in the axial region, has perforations and webs.

A fluidized bed reactor for granulating and coating particles in very small amounts having an essentially conical product container, a filter housing with filters inserted above the product container, and a lower housing below the conical product container having a process air supply. The product container has a sieve bottom in the center of which is a height-adjustable two-component nozzle. At least one guide element associated with the sieve bottom directs at least part of the process air to the two-component nozzle in a radial manner.

The invention discloses a municipal wastewater purification treatment method which comprises a pretreatment step, a bioreaction step, a filtration step, a sterilization step and an adsorption step which are carried out in sequence, wherein in the pretreatment step, gravel and large-sized floating objects can be removed and a stable water source is provided for subsequent treatment; in the bioreaction step, municipal wastewater is removed in low-carbon and high-efficiency manners, the treatment load is high, the treatment effect is good, organic and inorganic carbon sources do no need to be additionally added, and the oxygen consumption and the reflux quantity are low; in the filtration step, small particles and suspended matters in the wastewater are further removed; in the sterilization step, harmful organisms such as bacteria and viruses in the wastewater are killed; in the adsorption step, calcium magnesium ions, fluorine ions and other heavy metal ions in the wastewater can be efficiently removed. Purified product water from which pollutants are basically removed is stable in water quality, and the water quality is superior to the national standard A.

The invention relates to a continuous preparation process for an environment-friendly plasticizer and a device used in the process. The process comprises the following steps of: enabling solid terephthalic acid and isooctyl alcohol which serve as raw materials to react in the existence of an esterification catalyst and an antioxidant for continuously preparing dioctyl terephthalate (DOTP); pulpifying the solid terephthalic acid in the isooctyl alcohol until the particle size of the solid terephthalic acid reaches 5 to 20 mu m; adding the isooctyl alcohol so as to adjust the mole ratio of alcohol to acid in pulp liquid as 2:1 to 4:1; adding into a slurry tank, preheating, and entering a reaction kettle from the bottom; reacting with the preheated isooctyl alcohol which enters from the bottom of the reaction kettle in the reaction kettle in the existence of the esterification catalyst and / or the antioxidant; reacting until an acid value decreases to be below 2, and continuously feeding the raw materials namely the solid terephthalic acid and the isooctyl alcohol; and adding the DOTP which is generated in reaction from the upper part of the reaction kettle to a product tank, condensing the isooctyl alcohol which does not completely reacts and the generated steam through a condenser on the top of the reaction kettle, separating through an oil water separator, and entering an octyl alcohol tank for recirculation.

The invention relates to a desulfurization wastewater treatment device which comprises a pH regulation area, a reaction area and a precipitation area, wherein the pH regulation area comprises an alkali regulation area and an acid regulation area independently arranged from each other; an upper water inlet is formed at one end of the alkali regulation area; a lower water outlet is formed on one side of the acid regulation area; a lower water inlet is formed on the other side of the acid regulation area; the alkali regulation area is communicated with the reaction area through a water outlet pipe; the reaction area is communicated with the precipitation area; and an outlet end of the precipitation area is communicated with the lower water inlet through a water outlet pipe of a precipitation tank. In the device provided by the invention, by adopting an integrated device and a high-load mixed-flow reaction unit, the volume of the reaction area is reduced; with a relatively large flocculation adsorption area, the treatment efficiency is improved, and the volume of the precipitation tank is reduced; and through a great quantity of sludge circulation, the reaction is more sufficient, and the drug is saved. The system is an efficient novel process integration device which is compact in structure and simple to control.