Conversion section front gas, heat, oil water separator

Abstract

A conversion section front gas, heat, oil water separator for semi-water gas treatment relates to the production of nitrogenous fertilizer; wherein the separator comprises a housing; the upper part ofthe cavity of the housing is provided with a U-shaped tube bank inner core; the tube bank inner core is placed in an inner cylinder cavity without bottom; the upper opening of the inner cylinder is in fixed sealing connection with an upper sealing cover; the outside wall of the inner cylinder is provided with a gas inlet; the upper sealing cover is respectively provided with a soft water inlet and a hot water outlet; the outside wall of the upper part of the housing is provided with a gas outlet; the inside wall of the cavity of the housing at the lower part of the inner cylinder is mounted with a grid plate; the housing at the lower part of the grid plate is sealed; the invention can effectively condense and separate the water and oil, effectively use the compression heat of the gas fromthe second section of the compressor and has excellent effect of heat recovery.

Description

technical field [0001] The invention relates to nitrogen fertilizer production equipment, in particular to a pre-gas, heat and oil-water separator used in the transformation section used in the semi-water gas treatment process. Background technique [0002] In the production of small nitrogen fertilizers, after the semi-water gas is compressed to 0.8Mpa (or 1.3Mpa two pressure levels) by the second stage of the compressor, the temperature is about 130°C. In order to use this part of the gas compression heat, it directly enters and converts CO into CO 2 Transformation section, the transformation section is the equipment for transformation reaction, which includes oil-water separator, saturated hot water tower, heat exchanger, water heater, transformation furnace, etc.; the semi-water gas from the second stage of the compressor first passes through After the oil-water separator separates part of the oil and water, the semi-water gas enters the saturated hot water tower. The sa...

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Problems solved by technology

[0004] 1. The temperature of the semi-water gas at the second-stage outlet of the compressor is about 130°C, which is higher than the dew point temperature of the oil and water in the compressed gas. The lubricating oil injected into the second-stage cylinder of the compressor and the moisture content in the gas—water vapor cannot be condensed. The semi-water gas entering the conversion section at this temperature undoubtedly has a limited amount of oil-water separation in the semi-water gas, and the catalyst bed in which the semi-water gas enters the saturation tower, heat exchanger, and shift furnace in turn will increase in temperature, and the result The hot water circulation system of the saturated hot water tower is polluted by oil and other pollutants, resulting in high total solids content and a large amount of hot water sewage. The heat brought by the hot sewage is basically offset by the compression heat brought by the second stage of the compressor. At the same time It will also increase the temperature of the conversion gas at the outlet of the hot water tower, and the original design intention of using the semi-water gas compression heat at the second-stage outlet of the compressor has not been fundamentally realized.

[0005] 2. A large amount of oil and salts are brought into the catalyst bed of the converter furnace, volatilized and cracked at high temperature. On the one hand, part of the dirt remains in the upper catalyst bed of the converter converter to block the micropores of the catalyst, causing the catalyst to gradually lose its activity and even skin , resulting in increased resistance and affecting normal production. On the other hand, volatiles enter the lower catalyst layer (such as the low-slew catalyst bed) and condense in the low-slew catalyst layer, which further damages the low-slew catalyst and gradually loses its activity.

[0006] 3. During the annual overhaul, it is found that the packing layer of the saturated tower is clogged with oil and is seriously clogged. Manufacturers using structured packing, due to a large amount of oil clogging, the superiority of the structured packing cannot be brought into play, and the effect is not as good as that of ordinary packing. The heat transfer effect of semi-water gas and hot water is poor, less saturated steam is brought out, and the amount of additional steam is large, which increases the cost

It is very difficult to clean the oil stains in the packing layer, which is time-consuming and labor-intensive, and the packing is seriously damaged. The oil-contaminated packing is barely cleaned and then used. One unloading and one loading, the labor intensity is extremely high

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