Method for synthesizing ZSM-5 molecular sieve through two-segment temperature change

The invention relates to a method for synthesizing a ZSM-5 molecular sieve through a two-segment temperature-changing crystallizing process, which comprises the following steps of using a water-soluble liquid silicon source and a water-soluble liquid aluminum source as raw materials, wherein the molar ratios of the raw materials calculated by oxides are as follows: SiO2/Al2O3=50-70, Na2O/SiO2=0.05-5, H2O/SiO2=50-70, and a template agent/SiO2=0.05-0.4; mixing the silicon source and the template agent according to formula amounts with deionized water which is added by accounting for 15-33.3wt% of the total usage amount of the required water under a dynamic state of overall-process stirring to prepare an A solution, mixing the aluminum source and sulfuric acid according to the formula amounts with the water which is added by accounting for 24-44.4wt% of the total usage amount of the required water to prepare a B solution, slowly adding the B solution into the A solution, adding the residual ...

Broken strand detecting method for enameled stranded wire

The invention discloses a broken strand detecting method for an enameled stranded wire. The method mainly comprises the following steps of: removing an enameled film at the bottom end of each single strand of the enameled stranded wire, connecting the end to the cathode of a storage battery, putting the other end of each single strand of the enameled stranded wire into a saline phenolphthalein solution prepared in the first step, inserting a lead led out of the anode of the storage battery into the saline phenolphthalein solution, and performing power-on test; and viewing the light red flow condition at each single strand, wherein when a certain single strand does not have light red flow, the single strand is broken and should be removed, and when all single strands have the light red flow, the enameled stranded wire does not have a broken strand phenomenon, and thus a qualified product is obtained. By using the principle that the phenolphthalein solution becomes red in alkali, the broken ...

Process for Starting Up a Fluidized Catalytic Reaction Apparatus Used for Producing Lower Olefins

Disclosed is a process for starting up fluidized reaction apparatus which are used for producing lower olefins from methanol or/and dimethyl ether. Said process includes after heating the catalyst bed of circulating fluidized catalytic reaction apparatus to above 200° C. or 300° C. by using a starting-up auxiliary heat source, feeding methanol or dimethyl ether raw materials to a reactor, whereby heat released by the reaction makes the temperature of the reaction system apparatus increase quickly to a designed temperature, consequently making the system reach the normal operation state rapidly. Said process is suitable for starting up an exothermic fluidized catalytic reaction apparatus and can simplify the apparatus and operation, accordingly lowering the cost. 1. A process for starting up a fluidized catalytic reaction apparatus for producing lower olefins , in which methanol or a mixture of methanol and dimethyl ether is taken as raw material , and said reaction apparatus includes a reactor having a catalyst bed and a regenerator having a regeneration bed , the method including the steps of:1) heating the catalyst bed of the reactor in the circulating fluidized catalytic reaction apparatus to a temperature of 200° C. or above, and heating the regeneration bed of the regenerator to a temperature of 300° C. or above, by using a starting up auxiliary heat source;2) circulating the catalyst between the reactor and regenerator with a circulation rate as low as possible, wherein the catalyst circulation rate is higher than zero and lower than half of the normal catalyst circulation rate, wherein the normal catalyst circulation rate=catalyst inventory in the catalyst bed of the reactor divided by the normal catalyst residence time in the reactor, wherein the normal catalyst residence time is 45 minutes;3) feeding the raw material to the catalyst bed of the reactor in the fluidized catalytic reaction apparatus, whereby the catalyst bed of the reactor is further heated to ...

METHOD FOR STARTING UP A FLUIDIZED CATALYTIC REACTION APPARATUS USED FOR PRODUCING LOWER OLEFINS

Disclosed is a method for starting up fluidized reaction apparatus that is used for producing lower olefins from methanol or/and dimethyl ether. Said method includes after heating the catalyst bed of circulating fluidized catalytic reaction apparatus to above 200° C. or 300° C. by using a starting-up auxiliary heat source, feeding methanol or dimethyl ether raw materials to a reactor, whereby heat released by the reaction makes the temperature of the reaction system apparatus increase quickly to a designed temperature, consequently making the system reach normal operation state rapidly. Said method is suitable for starting up an exothermic fluidized catalytic reaction apparatus and can simplify the apparatus and operation, accordingly lowering the cost. 1. A method for starting up a fluidized catalytic reaction apparatus for producing lower olefins ,wherein said fluidized catalytic reaction apparatus is a circulating fluidized catalytic reaction apparatus comprising a reactor and a regenerator;wherein the reactor is a dense phase fluidized bed reactor in which is provided with a reactor heat extractor and cyclones, and the regenerator is a dense phase fluidized bed regenerator in which is provided with a regenerator heat extractor and cyclones;{'sup': '3', 'wherein the dense phase fluidized bed reactor is operated under a gauge reaction pressure of 0.05 to 0.3 MPa, a reaction temperature of 420 to 550° C., a dense phase apparent linear speed of 0.3 to 1.5 m/s and a bed layer density of 150 to 600 Kg/m;'}{'sup': '3', 'the dense phase fluidized bed regenerator is operated under a gauge reaction pressure of 0.05 to 0.3 MPa, a reaction temperature of 600 to 750° C., a dense phase apparent linear speed of 0.3 to 1.5 m/s and abed layer density of 150 to 600 Kg/m;'}in the reactor heat extractor, cooling water is used as cooling medium, wherein the cooling water is evaporated into steam by absorbing reaction heat, and the reactor heat extractor is a coil heat extractor, U ...

A process for starting up fluidized catalytic reaction means used for producing lower olefin

Disclosed is a process for starting up fluidized reaction apparatus which are used for producing lower olefins from methanol or/and dimethyl ether. Said process includes after heating the catalyst bed of circulating fluidized catalytic reaction apparatus to above 200 °C or 300°C by using a starting-up auxiliary heat source, feeding methanol or dimethyl ether raw materials to a reactor, whereby heat released by the reaction makes the temperature of the reaction system apparatus increase quickly to a designed temperature, consequently making the system reach the normal operation state rapidly. Said process is suitable for starting up an exothermic fluidized catalytic reaction apparatus and can simplify the apparatus and operation, accordingly lowering the cost.

PROCEDURE FOR STARTING FLUIDIZED CATALYTIC REACTION DEVICE USED FOR PREPARING LOWER OLEFIN

一种用于滚子链条轴套分拣的筛选装置

本实用新型公开了一种用于滚子链条轴套分拣的筛选装置，涉及机械设备的技术领域，包括内径筛选机构与外径筛选机构，内径筛选机构包括机架与安装壳，安装壳内转动设置有转轴，转轴的两端均固定有转盘，两个转盘之间的固定有多个连接轴，连接轴上沿其长度方向可拆卸设置有多个与转盘同心圆相切的串针，串针指向转盘的旋转方向，安装壳上设置有平行于串针运行轨迹设置的曲面板，曲面板的侧壁上沿串针运行轨迹开设有上端开口的导向槽。通过上述设置，使一部分轴套整齐的放置在导向槽内，在串针沿导向槽运行时，可顺利的将轴套串套在串针上，进一步增加了串针串套轴套的数量，有效的提高了筛选装置的工作效率。

一种链条精准拆节装置

本实用新型公开了一种链条精准拆节装置，涉及链条的技术领域。包括机架，机架的上端面包括有输送单元、定位单元以及拆节单元；输送单元包括轨道，轨道内沿其长度方向开设有卡槽；定位单元包括沿轨道的宽度方向滑移设置的定位架，定位架包括基板和转动连接在基板靠近轨道一侧的两个插板，机架的上端面固定有定位气缸，基板靠近轨道的一侧设置有用于调节两个插板之间夹角大小的调节组件；拆节单元包括升降设置定位架内的拆节柱以及开设在机架上端面的落销孔，落销孔位于拆节柱的正下方。本实用新型通过两个插板对链条进行插接定位，再通过调节组件使夹板转动，将链条卡紧，链条不容易晃动，降低了错位的发生，提高了拆节的精度与效率。