Device and method for increasing temperature of decarburization gas at inlet of synthesis ammonia methanation furnace

Abstract

The invention belongs to the field of chemical equipment, relating to a device for increasing temperature of decarburization gas at inlet of synthesis ammonia methanation furnace, comprising a decarburization gas preheater, a gas-gas heat exchanger, a decarburization gas heat exchanger and a methanation furnace which are orderly communicated with each other from front to back by a decarburization gas pipe; a heat source inlet of the decarburization gas preheater is connected with a low-variation gas input pipe; the heat source inlet of the gas-gas heat exchanger is connected with an outlet of the methanation furnace by a methanation gas input pipe; the heat source inlet of the decarburization gas heat exchanger is connected with a middle-variation gas input pipe by a valve, a heat source outlet is connected with a middle-variation gas output pipe, the middle-variation gas input pipe is connected with the middle-variation output pipe by a decarburization gas heat exchanger subline. According to the invention the device is used conveniently, and the device effectively increases the temperature of the decarburization gas, saves energy, reduces cost, does not consume hydrogen, does not generate water and methane influencing the catalyst, avoids disadvantage of carbon distribution method and does not need extra heat and electricity as heat source so as to greatly reduce the cost.

Description

technical field [0001] The invention belongs to the field of chemical equipment and relates to a device for increasing the temperature of decarburization gas at the inlet of a synthetic ammonia methanation furnace. Background technique [0002] Since the CO content of the low-variation gas is 0.1% after passing through the decarbonization device, the CO 2 If the content is 0.1%, there are too few reactants entering the methanation furnace, and the temperature at the furnace outlet is too low, so that the decarburized gas entering the methanation furnace cannot be heat-exchanged to above 300°C through the gas-gas heat exchanger, and the catalyst in the methanation furnace cannot be activated , CO, CO in the methane gas cannot be 2 If the content is controlled within 10ppm, the ammonia synthesis catalyst may be poisoned and deactivated. There are two common approaches: [0003] will contain CO before decarburization 2 The higher part of the low-variation gas is channel...

AI Technical Summary

Problems solved by technology

This method consumes a large amount of H 2 , and generate useless decontamination, water that may poison the synthesis catalyst water and inert gas that affects the activity of the synthesis catalyst - methane

[0004] Use an electric furnace or a heat exchanger using steam as a heat source to heat the decarburized gas so that the heat exchange of the decarbonized gas entering the methanation furnace is above 300°C. This method requires external heating or electric energy, and the cost is significantly increased.

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