144results about How to "Production safety and stability" patented technology

The invention discloses a leakage detection method for a closed circulating water system of a calcium carbide furnace. The method comprises the following steps that flow meters and thermometers are installed on cooling water return branch pipes of all equipment parts of the calcium carbide furnace to collect data in real time, and the change trend of flow and the change trend of temperature of all the branch pipes are recorded; a micro-differential pressure transmitter is arranged on the water supplement position of a high-level surge tank of the system to record the change trend of the liquid level; a dynamic alarm model between the change trend of the flow of the branch pipes and the change trend of the liquid level is established; alarm values of the trend difference of the flow of the branch pipes are synthesized to obtain alarm thresholds of the trend difference of the liquid level of the surge tank of different cycles, and leakage detection and positioning performed on the closed circulating water system of the calcium carbide furnace are completed according to the change trend of the flow and the change trend of the temperature of all the branch pipes. According to the leakage detection method for the closed circulating water system of the calcium carbide furnace, the number of the installed high-accuracy flow meters is greatly reduced, the leakage detection accuracy of the system is improved, the response speed is increased, and meanwhile system cost is effectively lowered. In this way, the leakage detection method provides a reliable guarantee for stable and safe production of calcium carbide furnaces.

The present invention discloses a device for automatically testing a web page, including the following components: a testing and processing apparatus to test and process a web page; a data storage apparatus used to store information of tested web pages, tested cases and data of test results; a testing tool to browse web pages, parse contents, control execution processes and to obtain error information; wherein the data storage apparatus and the testing tool are both connected with the testing and processing apparatus, and the testing tool is connected with the detected web system. The invention also discloses a method for automatically testing a web page. With the invention, the testing efficiency of web pages is greatly enhanced through parsing input domain objects of web pages and employing a testing method based on objects of web pages, and the invention will effectively improve software quality, guarantee stability and security of enterprise production.

The invention discloses a method for improving the efficiency of a steam turbine of a thermal power unit by steam temperature predictive control. The method comprises the following steps of: a, acquiring the values of a superheated steam temperature and a temperature reduction water quantity; b, establishing a functional relation between the superheated steam temperature and the temperature reduction water quantity, namely, A(q<-1>)yt=B(q<-1>)ut-d+xi/delta; c, identifying coefficients, namely, A(q<-1>) and B(q<-1>); d, calculating the quantity of temperature reduction water to be input in a next step; and e, judging whether the maximum value of the superheated steam temperature is a safe distance away from an upper limit or not, and if so, increasing the set value of the superheated steam temperature and circularly performing the steps from a to e.

The invention discloses a synthesis method of enantiomer-enriched indoline-2-formic acid shown in a formula (I). The synthesis method of the enantiomer-enriched indoline-2-formic acid comprises the following steps: by adopting low-cost and available ortho-position halogen substituted benzaldehyde and N-benzoyl substituted glycine as starting materials, carrying out Erlenmeyer-Plochl cyclization, alkaline hydrolysis and asymmetric catalytic hydrogen for constructing a chiral center, and then carrying out acid catalysis, deprotection and cyclization sequentially or cyclization, acid catalysis and deprotection sequentially, so that the enantiomer-enriched indoline-2-formic acid is obtained. The synthesis method of the enantiomer-enriched indoline-2-formic acid has the advantages that raw materials used in the whole process route are low-cost and easily available, harmful substances or multiple danger special processes are not used, reaction conditions are mild, technological operation is simple, production is safe and stable, the product yield is high, the purity is high, less three wastes are produced, and the energy consumption is low, so that the synthesis method of the enantiomer-enriched indoline-2-formic acid is a process route especially applicable to industrial production. The formula (1) is described in the specification.

The invention discloses a preparation method of chiral alpha-amino acid. Initial raw materials comprising aldehyde and N-acryl substituted glycine undergo Erlenmeyer-Plochl cyclization, hydrolysis or alcoholysis, asymmetric catalytic hydrogenation and acid hydrolysis to obtain the chiral alpha-amino acid compound. The method adopting the above synthesis route has the advantages of mild reaction conditions, simple technological operation, safe and stable production, realization of high yield, good chemical purity and good optical purity of the above obtained product, wide application range, and suitableness for industrial production.

The invention discloses a gas concentration two-dimensional distribution on-line detection system and method, and belongs to the technical field of laser spectroscopy gas on-line detection. Compared with the prior art, the system has the advantages that a laser beam splitting cabinet splits a laser path emitted from a laser control cabinet into a plurality of paths of detection light paths and a one-path reference light path in reticular distribution; the multi-path detection light paths and the one-path reference light path respectively pass through a target gas region to be detected and a reference target gas region and are then received by a data receiving cabinet; a computer calculates the gas concentration two-dimensional distribution data according to the multi-path detection light paths and the one-path reference light path processed by the data receiving cabinet. The method has the advantages that the absorption coefficient of target gas in each pixel is calculated according to the integral light absorption degree of each path of detection light path and the light path in each pixel; the two-dimensional concentration value of target gas in a target gas region to be detected is calculated by referring to each known parameter of the target gas region. The gas environment in the industrial production process can be precisely reflected through calculating the two-dimensional concentration value of the target gas.

The invention relates to a method for purifying dichloroethane from vinyl chloride rectification residual liquid. In the method, a rectification tower, a residual liquid tank, a residual liquid pump, a vacuum distillation tower, a dichloroethane pump and a dichloroethane tank which are connected sequentially are provided, and a vacuum pump for controlling the vacuum degree of the vacuum distillation tower is also provided. The method provided by the invention is characterized in that: according to the volatility difference at different temperatures and different pressures of each component in the vinyl chloride rectification residual liquid, the rectification residual liquid from the bottom of the rectification tower is introduced to the vacuum distillation tower to remove the impurity gases in the residual liquid, so that the mass percentage of dichloroethane in the rectification residual liquid is not less than 98%, and then refined dichloroethane is conveyed to a refined dichloroethane tank for storage from the tower bottom of the vacuum distillation tower through the dichloroethane pump, thereby the purpose of dichloroethane purification is finally realized. The method provided by the invention has the advantages of less equipment, simple and reasonable process, easy implementation, simple operation, easy control and very stable production, and can achieve the purposes of safe production, energy saving, consumption reduction and quality improvement.

The invention discloses a cold-state curling method for producing para-position aramid short fibers. The method comprises the following steps of: bunching aramid filaments, washing by the oil washing of an oil washing tank or hot water bath or a low-pressure steam heat box, and curling the softened aramid filaments in a mechanical stuffing curling box; after curling the aramid filaments, drying the curled fibers in a drying oven at the temperature of between 80 and 140 DEG C; and performing tensioning, and cutting the fibers off in a cut-off machine to obtain the para-position aramid short fibers with high curling performance. According to the method, before entering the curling box, the fibers are not needed to be subjected to high-temperature preheating treatment at the temperature which is higher than the glass transition temperature of 340 DEG C of the fibers so as to soften molecular chain segments, the fibers are not needed to be heated at high temperature in the curling box, and the curled fibers are not needed to be subjected to high-temperature setting of about 340 DEG C.

A polycrystalline ingot casting anti-arcing furnace crucible cover plate comprises a square cover plate body, the square cover plate body is provided with a center hole and a vent hole, the center hole is arranged in the center of the square cover plate body, and four corners of the square cover plate body are provided with avoiding gaps. The avoiding gaps can be square, right angled isosceles triangular or right angle sectored in shape. The part of the four corners upward warping due to deformation, in contact with a top graphite heating plate, is cut off to form the gaps, so the contact of the crucible cover plate with a bolt on the top graphite heating plat due to bending deformation is avoided, an arching sparking phenomenon is avoided, and damages of arcing to an ingot casting furnace heating element are avoided. The cover plate disclosed in the invention has 3-6 month longer life, discarding of a graphite heater and the graphite bolt due to sparkling is avoided, and the safe stable production of an ingot casting furnace is guaranteed.

The invention discloses a deep part high-stress environment self-stabilizing arched stope arrangement mining method, which comprises the following steps of (1) ore block arrangement; (2) mining-cutting engineering; (3) stopping; (4) ventilation; (5) ore removal work; (6) filling work; (7) self-stabilizing arched ore pillar stopping. The method provided by the invention belongs to the deep part high-stress environment self-stabilizing arched stope arrangement mining method capable of effectively improving the stope stability and providing the effective safety guarantee for the deep part high-stress ore deposit safe exploitation.

Provided is a fluoroboron compound which is highly safe and stable and is capable of forming a cyclic ether-fused ring by the intramolecular alkoxymethylation reaction, or a salt thereof. The compound can be synthesized by the intramolecular alkoxymethylation reaction of a fluoroboron compound represented by the formula (I) or a salt thereof in the presence of a metal catalyst.

represents an aromatic ring; L represents a substituent such as a halogen atom; R represents a substituted or unsubstituted alkylene group having 1 or 2 carbon atoms; and M represents an alkali metal cation or the like, with the proviso that L and —R—OCH₂BF₃M are respectively located on contiguous carbon atoms on the aromatic ring, or in the case of a fused aromatic ring, on two carbon atoms adjacent to one carbon at the fused position).