Process for removing ammoniacal nitrogen from sewage of coking

A process for removing ammoniacal nitrogen from sewage of coking features that denitrificating reaction and back-nitrating reaction take place in anoxic pool where NO2 is as electron receptor, nitrosating reaction of NH3-N takes place in first segment of aerobic pool to obtain NO2, the part of sewage containing NO2 flows back to anoxic pool, and rest of sewage flows into second segment of aerobicpool. Its advantages are need of less bubbling air in nitrificating reaction, high back-nitrating rate, less consumption of sodium hydroxide, and low cost.

Method for repairing and mending cracked negative-pressure pipeline

The method for repairing cracked subatmospheric pipeline includes the following steps: firstly, the cracked position is repaired, then the repaired cracked portion is wrapped with steel band, and theexterior of the steel band is covered with steel hoop, than an inert gas is introduced into the space between the steel hoop and outer laye of the steel band, finally the steel hoop is welded on the cracked subatmospheric pipeline. Said method is safe, reliable, and can be implemented on-line.

Multi-mode TRL calibration method based on improved mode tracking and symbol judgment

The invention provides a multi-mode TRL calibration method based on improved mode tracking and symbol judgment. The multi-mode TRL calibration method comprises the steps of S1, port number standardization check; s2, converting the S parameter into the T parameter; s3, matrix decomposition is carried out, and eigenvalues and eigenvectors are solved; s4, mode sorting and characteristic value mode tracking, wherein a mode tracking method based on Hermite inner product is adopted; s5, judging the symbol of the reflector; and S6, obtaining DUT parameters. According to the multi-mode TRL calibration method based on improved mode tracking and symbol judgment, the time complexity of the algorithm can be remarkably reduced.

Method for repairing and mending cracked negative-pressure pipeline

Process for removing amoniacal nitrogen from sewage of coking

Earth surface monitoring image processing method based on SAR

The invention relates to an earth surface monitoring image processing method based on SAR. The earth surface monitoring image processing method includes the steps of obtaining SAR images in the same earth surface monitoring area at the same moment, conducting edge contour extraction, conducting filtering pretreatment, obtaining the average pixel after pixel processing is carried out, selecting the pre-processed SAR images with the least square method, correspondingly conducting summation on all the pixels in the pre-processed SAR images to obtain the average value to serve as the corresponding pixels in the pre-processed SAR images, conducting reconstitution to obtain the processed SAR images, obtaining the SAR images in the same earth surface monitoring area at different moments, and obtaining the processed SAR images at all moments. The earth surface monitoring image processing method is simple in processing mode, small in calculation amount and easy to match and align; in addition; in ...

Process for preparing multiring or fused-ring binary carboxylate by heteropoly acid catalysis

A process for preparing multiring or fused-ring aromatic binary carboxylate by catalysis of heteropoly acid features that in the esterifying reaction of multiring or fused-ring aromatic binary carboxylic acid, heteropoly acid is used as catalyst to obtain high-output, high-purity high-molecular monomer of multiring or fused-ring aromatic binary carboxylate. Its advantages are no corrosion to apparatus and no environmental pollution, because of abandoning the use of concentrated sulphuric acid as catalyst.

Preparation method of coal series needle type coke

The present invention relates to a prepn. method of coal series needle-like coke which uses pit asphalt as raw material. The raw material is purified by two-stage vacuum flash vaporization to remove impurities and high-thermal reaction activitycomponents and to obtain the purified material, the first stage possesses higher temp. and lower pressure than that of the second stage, the purified material is heated and carbonized to obtain fine material which is further carbonized and posttreated to obtain coal series needle-like coke. The present invention is characterized by two-stage flash vaporization and two-stage carbonization so that the quality of product is improved and no blockage occurs in the system.

Ultra-wideband chaotic light source based on light injection and ultra-wideband chaotic generation device

The invention belongs to the technical field of chaotic communication, and particularly relates to a broadband chaotic light source and an ultra-broadband chaotic generation device based on light injection. The broadband chaotic light source comprises a discrete mode slave laser and a discrete mode master laser, laser output by the discrete mode slave laser is divided into two beams after passing through a first coupler, one beam returns to the discrete mode slave laser through an annular optical fiber, and the other beam enters a second coupler after passing through an optical circulator and is divided into two beams through the second coupler. Wherein one beam serves as an output end to directly output chaotic light, and the other beam sequentially passes through the attenuator and the third coupler, then returns to the optical circulator and then is fed back to the discrete mode slave laser through the first coupler. Injection laser output by the discrete mode master laser is incident ...

Beam steel framework and beam column connecting part stirrup binding method

The invention relates to a beam steel framework and beam column connecting part stirrup binding method. A beam steel framework comprises a connecting part stirrup, a fixing rib, a main beam rib and a beam stirrup. The construction steps include that 1, after mounting floor and a beam template, placing a plurality of upholders on the beam template; 2, binding the beam steel framework on the upholders, wherein the connecting part stirrup of the beam column connecting part is bound on the fixing rib according to a specified gap, and then the fixing rib is bound on the main beam rib; 3, binding the beam stirrup on the part of the main beam rib located between two columns, wherein the beam stirrup is vertical to the main beam rib; 4, taking out the upholders, and placing the bound steel framework at a designed position. The beam steel framework and beam column connecting part stirrup binding method facilitates binding through rising the binding position of the beam rib framework, the construction ...

煤系针状焦的制备方法

... 本发明是一种煤系针状焦的制备方法。它采用配制的煤软沥青为原料，原料经净化和调制后，再经炭化制成煤系针状焦，原料净化是在原料加热后，以第一段比第二段温度较高而压力较低的两段真空闪蒸，除掉杂质和热反应活性高的组份而制得不含杂质、不含热反应性高组份的净料，同时分别获得副产品粘结剂和联产品优质浸清剂；净料经加热后加压预炭化，得到分子量分布范围集中的精料，然后对精料进行炭化，炭化后产物经后处理制成煤系针状焦产品。本发明采用两段闪蒸和两步炭化技术，改善了产品质量，系统不堵塞，设备内无结焦现象；可采用菲残油配制煤软沥青作原料，扩大原料资源，提高增值率。 ...

Process for preparing multiring or fused-ring aromatic binary carboxylate by heteropoly acid catylysis