39results about How to "Reduce venting" patented technology

The deoxygenation method of the butadiene refining unit is to add a deoxygenation system before the crude butadiene raw material enters the water washing tower, and a certain concentration of NaNO 2 The aqueous solution is continuously pumped into the washing tower with a metering pump to ensure a certain amount of NaNO in the washing tower. 2 Solution concentration, the free oxygen in the raw material is removed by the sufficient contact between the washing water and the material in the water washing tower. NaNO in washing tower 2 The concentration of the solution is controlled so that the aqueous solution can effectively remove the oxygen in the raw material without causing pollution to the subsequent system. The method of the present invention effectively eliminates the oxygen brought into the refining device in the raw material of crude butadiene, and will greatly slow down the formation speed of the terminal polymer in the light removal tower and the weight removal tower, and may gradually disappear, greatly prolonging the operation of the refining device cycle. It will reduce the loss of butadiene caused by venting and deoxygenating the top reflux tank of the original light removal tower.

The invention discloses an online turning-down switching method for a multi-burner gasifier. According to the method, in turning-down switching, oxygen in inner passages of burners is substituted withN2 and / or CO2, and saved oxygen is used for starting a standby gasifier. By adoption of the method, minimization of load fluctuation in a turning-down process can be realized, influences on system stability in a switching process are reduced, and important guarantee is provided for safe and stable operation of modern coal chemical industrial devices for entrained-flow bed coal water slurry gasification. In a turning-down process, atomizing effects can be basically kept unchanged, gasifying process performances are guaranteed, and synthetic gas quality is guaranteed. By adoption of the method,oxygen consumption in the switching process can be reduced, oxygen is effectively saved, synthetic gas emptying quantity in the turning-down switching is reduced, and the design margin of an air separation device can be appropriately reduced.

The invention discloses a step-by-step sulfuration method of a sulfur tolerant shift catalyst, belongs to the technical field of pre-sulfuration treatment of a carbon monoxide sulfur tolerant shift catalyst, and particularly relates to a method for rapidly sulfurating a cobalt-molybdenum series sulfur tolerant shift catalyst. Specific to the condition of insufficient sulfuration condition after a new up-conversion device or old device is reconstructed at present, particularly less warming means, a step-by-step sulfuration method is adopted, namely, a method of rapid pre-sulfuration in a medium-low temperature device and online medium-high temperature short-time intense sulfuration is adopted, thus the sulfuration time is shortened, the sulfuration cost is lowered, and the sulfuration effect achieves a sulfuration effect of a conventional catalyst.

The invention belongs to the field of chemical industry and relates to a temperature-increasing reduction system, in particular to a two-stage temperature-increasing reduction method for a coal-to-natural gas methanation catalyst. In this method, more than six methanation reactors are divided into two sections, and two nitrogen cycles are respectively established, and the temperature is raised in sections, and the reduction is carried out in sections. The reduction uses a part of the raw material gas, that is, the synthesis gas, and uses the reducing gas in the raw material gas. h 2 , CO to reduce the catalyst; after the second stage reduction is completed, the temperature of the first stage methanation reactor that has been cooled is raised, and the difference between the temperature raised in the first stage and the temperature lowered in the second stage is ±50°C At this time, the overall temperature of all methanation reactors is raised until the start-up temperature requirements are met. The method can greatly shorten the heating time and reduction time; save a large amount of high-purity nitrogen; make the reduction process more flexible and easier to control, which is beneficial to more balanced and thorough reduction of methanation catalysts at all levels.

The invention discloses a method for coproducing or singly producing food grade carbon dioxide and industrial grade carbon dioxide by utilizing industrial waste gas. The method takes industrial waste gas as raw material, and adopts two-step process of separation and purification; first, the feed gas is treated with primary purification, primary drying, primary condensation and primary extraction in sequence at 3.0 to 6.5 MPa by taking the quality of industrial products as an objective; and then part of or all the gas enters an industrial grade product storage tank, and the balance is decompressed to 1.8 to 3.5 MPa and treated with secondary purification, secondary drying, secondary condensation and liquefaction in sequence by taking the quality of food grade products as an objective; subsequently, secondary extraction is conducted to obtain the food grade carbon dioxide products. The invention adopts two-grade extraction process and a set of apparatus to coproduce or singly produce food grade carbon dioxide and industrial grade carbon dioxide, and can adjust the proportion between the food grade products and the industrial grade products in accordance with requirements; the invention also has the advantages of wide range of feed gas application, investment saving, low energy consumption, high recovery rate of carbon dioxide, excellent quality of products, safe and stable operation of the apparatus, and the like.

The invention discloses a shaft seal structure of a threaded-rod steam compressor and a monitoring system thereof. The threaded-rod steam compressor comprises a shell, a threaded-rod rotor arranged inthe shell, the shaft seal structure, high-pressure-side bearings and a low-pressure-side bearing; the threaded-rod rotor comprises a threaded-rod compression part and two-side rotor shaft parts, thethreaded-rod compression part compresses steam, and the high-pressure-side bearings and the low-pressure-side bearing sleeve the two rotor shaft parts; the shaft seal structure is characterized by comprising a high-pressure-side shaft seal assembly and a low-pressure-side shaft seal assembly which are arranged on the rotor shaft parts and located between the high-pressure-side bearings and the threaded-rod compression part and the low-pressure-side bearing and the threaded-rod compression part, the high-pressure-side shaft seal assembly comprises high-pressure-side front-arranged seals, a high-pressure-side skeleton air seal and a high-pressure-side skeleton oil seal, and the low-pressure-side shaft seal assembly comprises low-pressure-side front-arranged seals, a low-pressure-side skeleton air seal and a low-pressure-side skeleton oil seal. The monitoring system monitors working states of the high-pressure-side skeleton air seal, the low-pressure-side skeleton air seal, the high-pressure-side skeleton oil seal and the low-pressure-side skeleton oil seal. The structure is simplified, the emptying amount of steam is decreased, injection of compressed air is canceled, and the cost issaved; monitoring of the shaft seal structure is achieved under the condition that the machine is not disassembled.

Belonging to the field of olefin polymerization in the petrochemical industry, the invention discloses a preparation method of high impact co-polypropylene. Specifically, carboxylate superfine powder particles are added into a vapor phase polymerization kettle to replace the existing LPN system. The preparation process is simple and practicable, compared with the prior art, the method provided by the invention can be applied to acquire a high impact ethylene co-polypropylene product, and also the method can maintain long-period stable operation of the production device.

The invention discloses a pressure swing adsorption decarburization method and equipment capable of realizing an adjustable alcohol-ammonia ratio, and belongs to the field of pressure swing adsorption decarburization. The method takes the two-stage pressure swing adsorption process as the main line, sets up a secondary line between the first stage of the two-stage pressure swing adsorption process and the fine desulfurization mechanism, and controls whether the two-stage variable The two-stage pressure swing adsorption mechanism of the pressure adsorption process was incorporated into production. The equipment adjusts the methanol and synthetic ammonia process flow through measures such as short-term parking, replacement, and adjustment of corresponding lines, and a set of equipment realizes two process routes for alcohol ammonia production. Compared with the prior art, the pressure swing adsorption decarburization method and equipment of the present invention have the characteristics of easy realization, low equipment cost, wide product adaptability, etc., and have good popularization and application value.

The invention discloses a CO cryogenic separation system using nitrogen cycle. The CO cryogenic separation system comprises a main heat exchanger, a cryogenic separator, a hydrogen stripper, a demethanizer, a denitrogenation tower, a condensing evaporator and a cycle nitrogen compressor. The invention further discloses a CO cryogenic separation method using nitrogen cycle, wherein the CO cryogenic separation method comprises process steps of heat exchange, dehydrogenation, demethanation, denitrogenation, nitrogen compression refrigeration cycle and the like. The CO cryogenic separation system and method provided by the invention have beneficial effects that a nitrogen cycle compression and refrigeration process is adopted to fully play roles of high efficiency and low investment of a nitrogen compressor; the condensing evaporator is arranged to cleverly integrate the demethanizer and the denitrogenation tower, so as to greatly reduce power consumption of distillation; an operation pressure of a distillation tower is increased or a CO liquid pump is provided for replacing a CO compressor so as to meet pressure requirements of CO products; start-up and purification time of the device can be shortened and a venting amount at a start-up stage can be reduced; the system and the method has advantages of low energy consumption, fast start-up, investment saving and less emission, are in line with a general trend of energy conservation and consumption reduction, and have good economic and environmental protection benefits.

The invention relates to a segmental pre-vulcanizing method of a sulfur tolerant shift catalyst in a multi-segment conversion process, particularly relates to a method for rapidly pre-vulcanizing cobalt-molybdenum-series sulfur tolerant shift catalysts and belongs to the technical field of pretreatment of the sulfur tolerant shift catalyst. According to the method, aiming at the situations of the temperature raising and the slow vulcanizing speed caused due to insufficient vulcanizing conditions, a segmental vulcanizing method is utilized, namely the rapid pre-vulcanizing of a first-segment furnace is reinforced to raise the temperature of a subsequent second-segment furnace; first-segment vulcanizing conditions are reinforced to guarantee the vulcanization of the catalyst so as to realize the rapid, efficient and complete vulcanization, meanwhile, the temperature of a subsequent second-segment bed is raised by high-temperature vulcanized gas in a rapid vulcanizing process, and the subsequent working segments are similarly processed, so that the vulcanizing and temperature raising time is greatly shortened, and the vulcanizing cost is lowered; by utilizing a circular vulcanizing manner, the emptying quantity is few, the overtemperature is avoided, the vulcanizing process is convenient and safe, the pollution is light, and the method has remarkable economic and social benefits.