Tianjin University

Tianjin Passion Science and Technology Co., Ltd.

Zhong Zhang

Tao Zhu

Mingfa Yao

Yang Wang

Xiao Wei Zhang

Fang He

Jinsong Wang

Qian Xiong

Aishan Wang

Qingyun Tian

Weiguo Song

Xinjian Yin

Shuaiqing Xu

Yuqing Yang

Qingting Wei

Zhu Ji

Hongwei Ru

Wenwen Zhang

Haijun Mei

The present invention provides a hydrothermal oxidation method for producing alkali metal dichromate from carbon ferrochrome, and the method comprises the following steps: formulating an initial reaction liquid by mixing carbon ferrochrome, an alkaline substance and water, in which the actual addition amount of the alkali is controlled smaller than the theoretically required amount; adding the initial reaction liquid into a reaction kettle, charging an oxidizing gas into the reaction kettle, and allowing the reaction to proceed for 0.5 to 3 h at a temperature of 150&#xb0; C. to 370&#xb0; C. and a pressure of 2 Mpa to 24 MPa; carrying out solid-liquid separation, cooling the resultant filtrate to a temperature of &#x2212;12&#xb0; C. to &#x2212;20&#xb0; C. to precipitate crystals, and carrying out separation by centrifuge to obtain alkali metal dichromate solution; adding CrOto the alkali metal dichromate solution until the degree of acidification reaches 100% or greater, concentrating the solution by evaporation, and cooling it to precipitate crystals, so as to afford alkali metal dichromate. The method has a simple process, is easy to control, and can directly produce sodium dichromate under hydrothermal conditions.

Hydrothermal oxidation method for production of alkali metal dichromate from carbon ferrochrome

A common rail electronic control injection system which uses a DME or a low-viscosity fuel similar with DME to inject into a combustion engine, includes a fuel container, a common rail tube, a high-pressure tube, an electronic control injector, an electronic control unit, a high-pressure pump, a working medium case, a reversing component, and a pressure convertor, wherein the pressure convertor includes at least two working components, each working component is divided into a fuel chamber and a working medium chamber by an dividing element, the dividing element can freely deform or move between the fuel chamber and the working medium chamber by pressure effect. The invention avoids the sealing and abrasion problem in the plunger matching portions which is caused by the low-viscosity fuel so as to greatly improve the lifetime and reliability of system.

Electronic control common rail DME injection system

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Tianjin, China

Zhong Zhang