Method of recovering catalyst for low-temperature conversion of carbon monoxide

 

(57) Abstract:

The described method of recovery of the catalyst of low-temperature conversion of carbon monoxide related to the production process gases and which can be used to obtain nitric gas mixture. In the method instead of the separate inert gas and hydrogen through the catalyst bed is suggested to use the products of incomplete combustion of natural gas containing hydrogen and enriched with water vapor. The content of carbon monoxide in an inert gas in the process of recovery of the catalyst in the range of 0.1-10% regulate the consumption of natural gas supplied to the combustion. Removing the formed condensate is carried out in the cooling of exhaust gases. The method allows to simplify the process and control of technological operations. 2 C.p. f-crystals.

1. Object technology.

The present invention relates to the production of process gases and can be used for recovery of catalysts for low-temperature conversion of carbon monoxide used, for example, upon receipt of nitric gas mixture for the glass industry, metallurgy, mashinostroyitelny conversion of carbon monoxide used in various technological processes, in particular, when receiving attachoptions a controlled atmosphere.

The production of nitric gas mixture includes the following main processes: high-temperature incomplete combustion of natural gas, low-temperature steam reforming of carbon monoxide, cooling the products of combustion and separation of condensed moisture, pressure adsorption purification of combustion products from moisture and carbon dioxide.

The gas mixture produced in the nitric plant with a capacity of gas ready from 100 to 500 m3per hour, each of which consists of the following blocks: block burning, the conversion block, and the cooling unit, the unit adsorption adsorption.

To improve air quality by reducing the content of hydrocarbons with steam conversion of carbon monoxide used low-temperature zinc-chromium-copper catalyst, the operating temperature which is in the range of 160-220oC, to ensure maximum activity which requires careful restoration.

A known method of recovering low-temperature catalyst for conversion of carbon monoxide /reference guide katalizatorami way exothermic recovery of copper-containing catalysts is carried out according to the following scheme:

- purge the catalyst invert gas to remove air;

- heat the catalyst in a stream of inert gas to the 120oC at 50oC per hour;

- flow of inert gas through the catalyst with a volume rate of about 600 hours-1gradually adding hydrogen to 0.5 mol%;

- increase the temperature in the layer 180oC at a rate of about 30oC per hour;

- when you set the recovery mode, increase the temperature to 200oC for one hour;

within three hours increase the hydrogen concentration up to 1.5%, by the end of the recovery for a given concentration of hydrogen increase the temperature to 225oC;

- remove the condensate /water/ in the recovery process;

special attention is paid to the fixing of an amount of hydrogen consumed in the recovery /1 m3catalyst/. In addition, conduct additional monitoring of the process of recovery of the catalyst by determining the quantity of water given in the process restore to 1 m3catalyst;

- raise the hydrogen concentration up to 10% when the inlet temperature of 225oC.

The main disadvantages of the method are the following: the complexity osushestvleniya, various sequence diagram their feed, constant speed control of the temperature increase of the amount spent on the recovery of hydrogen and the amount of water formed during the recovery/.

Also noteworthy is the high temperature in the recovery process.

3. The essence of the invention.

In the proposed method of recovery of the catalyst of low-temperature conversion of carbon monoxide, the recovery process carried out at constant pressure of the inert gas as the inert gas used products of incomplete combustion of natural gas containing hydrogen and obogashenie water vapor, and removing condensate water is carried out after the recovery process.

Recovery of the catalyst is carried out in the Converter by feeding through a layer of catalyst products of incomplete combustion of natural gas containing hydrogen, for example, after the burning of natural gas in the process of obtaining nitric atmospheric nitric installations. The gas mixture enriched with water vapor, is fed at a constant pressure of 30 to 60 kPa and a temperature of 160-180oC. the Content of carbon monoxide rises gradually in the process of reconstruction is Stanovlenie catalyst the hydrogen content at the outlet of the Converter must be set approximately equal to the total content of carbon monoxide and hydrogen at the input of the Converter. The content of carbon monoxide in an inert gas in the recovery process within 0.1-10% regulate the consumption of natural gas supplied to the combustion. The condensate generated during the recovery of the catalyst is removed separately in the cooling unit.

4. Information confirming the possibility of carrying out the invention.

Products of incomplete combustion of natural gas produced in the process of obtaining nitric controlled atmosphere, with a constant pressure of 40-50 kPa, enriched with water vapor, and with a constant temperature of 160-180oC are fed into the Converter to recover the zinc-chromium-copper catalyst for low-temperature conversion of carbon monoxide. The content in the products of incomplete combustion of natural gas of carbon monoxide is from 0.1% with a gradual increase up to 10% with full recovery of the catalyst, is regulated by the consumption of natural gas is fed to the combustion in the combustion chamber. During recovery of the Converter, the temperature in the zones of the Converter must not exceed 240oC. When the temperature in the zones of the Converter above 240oC necessary to reduce the content of carbon monoxide at the input of the Converter.

In blithedale is equal to the total content of carbon monoxide and hydrogen at the input of the Converter. To determine this ratio, you need to periodically analyses on chromotography combustion products after the Converter.

The condensate formed during the restore, remove the cooling unit flue gas.

1. Method of recovering catalyst for low-temperature conversion of carbon monoxide at a temperature of 120 to 225C by separate feed through the catalyst bed of inert gas and hydrogen, and selection of water generated in the recovery process, characterized in that as the inert gas used products of incomplete combustion of natural gas containing hydrogen and enriched with water vapor, recovery of the catalyst is carried out at constant gas pressure of 30 to 60 kPa, and the content of carbon monoxide in an inert gas in the recovery process within 0.1 - 10 % regulate the consumption of natural gas supplied to the combustion.

2. The method according to p. 1, characterized in that the condensate drain is carried out in the cooling unit flue gas.

3. The method according to p. 1, characterized in that as the inert gas used products of incomplete combustion of natural gas produced in the process of obtaining nitric controlled atmosphere.

 

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