CN213994881U

CN213994881U - Condensation separation device for pressurization activity test of carbon monoxide low-temperature shift catalyst

Info

Publication number: CN213994881U
Application number: CN202022416884.2U
Authority: CN
Inventors: 陈延浩; 李敏
Original assignee: China Petroleum and Chemical Corp; Research Institute of Sinopec Nanjing Chemical Industry Co Ltd
Current assignee: China Petroleum and Chemical Corp; Research Institute of Sinopec Nanjing Chemical Industry Co Ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-08-20
Anticipated expiration: 2030-10-27

Abstract

The utility model belongs to the technical field of chemical equipment, and relates to a condensation and separation device for the pressurization activity inspection of a carbon monoxide low-temperature shift catalyst, which is characterized by comprising a flat cover, an outer cylinder, a coil pipe, an inner cylinder, a gas inlet and outlet, a condensation medium inlet and outlet, and a discharge port; the condensation medium inlet and outlet are communicated with the outer cylinder body, and the outer cylinder body is sealed by a flat cover; the gas inlet and outlet are communicated with the coil pipe, the coil pipe is communicated with the inner cylinder body, and the lower part of the inner cylinder body is provided with a clean discharge opening and extends out of the outer cylinder body. The device of the utility model is connected with the reaction device by pipelines, so that the investment cost is low, the occupied area is small, and the operation is convenient; the reaction tube is made of special steel, so that the heat transfer is good, and the condensation effect is good.

Description

Condensation separation device for pressurization activity test of carbon monoxide low-temperature shift catalyst

Technical Field

The invention belongs to the technical field of chemical equipment, and particularly relates to a condensation separation device for pressurization activity test of a carbon monoxide low-temperature shift catalyst.

Background

The CO low-temperature shift catalyst is widely used in the ammonia synthesis and hydrogen production industries and is used after being connected in series with the medium-temperature shift catalyst. In industrial production, the content of carbon monoxide in gas after medium-temperature conversion is about 3%, and then after low-temperature conversion, the content of carbon monoxide can be reduced to 0.4% or even lower, so that the yield of hydrogen can be improved, and the burden and investment cost of the subsequent purification process can be reduced. Production practices have shown that the yield of hydrogen or ammonia can be increased by 1.1% to 1.6% for every 0.1% reduction in carbon monoxide in the low temperature shift outlet gas. Therefore, the low-temperature change catalyst is a very key catalyst for hydrogen production and ammonia production plants, and the low-temperature performance of the low-temperature change catalyst directly affects the economic benefit of the plants, so that the activity detection accuracy considering the performance of the low-temperature change catalyst is very important.

Carbon monoxide in the raw material gas and a certain proportion of steam are subjected to chemical reaction under the action of a carbon monoxide low-temperature shift catalyst to generate carbon dioxide and hydrogen. The volume fraction of carbon monoxide in the gas before and after the reaction is analyzed by a gas chromatograph (or other carbon monoxide analyzers), and the conversion rate of carbon monoxide is calculated, so that the activity of the catalyst is represented. The reaction tail gas often contains a certain amount of water vapor and impurities, which affect the accuracy of the measurement result, and the water vapor and the impurities must be removed by condensation separation.

Disclosure of Invention

The utility model provides a gas-liquid condensation separator to contain impurity and influence the accuracy of testing result in solving the tail gas.

The purpose of the invention is as follows: the cleanness degree of the tail gas of the pressurized active reaction of the carbon monoxide low-temperature shift catalyst is the key for judging whether the activity test result is accurate or not.

After the condensation separation device provided by the invention effectively removes water vapor and impurities in the tail gas, the volume fraction of carbon monoxide in the gas before and after reaction can be analyzed by a gas chromatograph (or other carbon monoxide analyzers), and the conversion rate of carbon monoxide can be calculated.

The technical scheme is as follows: the condensation and separation device for the pressurization and activity inspection of the carbon monoxide low-temperature shift catalyst is characterized by comprising a flat cover, an outer cylinder, a coil pipe, an inner cylinder, a gas inlet, a gas outlet, a condensing medium inlet, a condensing medium outlet and a purge outlet; the condensation medium inlet and outlet are communicated with the outer cylinder body, and the outer cylinder body is sealed by a flat cover; the gas inlet and outlet are communicated with the coil pipe, the coil pipe is communicated with the inner cylinder body, and the lower part of the inner cylinder body is provided with a clean discharge opening and extends out of the outer cylinder body.

Typically, the flat lid is provided with a pressure relief vent.

The outer cylinder body and the flat cover are made of common stainless steel,

the coil pipe and the inner cylinder body are made of corrosion-resistant high-strength special alloy steel.

The condensing medium is water.

The condensation separator is sealed by a flat cover with a pressure relief opening, and when the pressure of a condensation medium is overhigh, the pressure can be relieved through the pressure relief opening. The coil pipe is rigidly welded with the inner cylinder body, and the heat medium is internally transferred and exchanges heat with the condensing medium. Gas and liquid are condensed and separated in the inner cylinder body. The gas goes to the analysis system and the liquid is discharged from the purge port.

The working process of the utility model is as follows: the tail gas from the reactor enters the coil pipe from the gas inlet of the condensation separator and exchanges heat with the condensing medium entering the cylinder from the condensing medium inlet at the lower end of the condenser. Condensing and separating water vapor and impurities in the tail gas, and discharging the water vapor and the impurities from a purge outlet; the gas is sent to a gas chromatograph (or other carbon monoxide analyzers) from a gas outlet of the condensation separator, and the volume fraction of carbon monoxide in the gas before and after the reaction is analyzed.

Advantageous effects

1. The device is connected with the reaction device by pipelines, so that the investment cost is low, the occupied area is small, and the operation is convenient;

2. the reaction tube is made of special steel, so that the heat transfer is good, and the condensation effect is good.

Drawings

FIG. 1 is a schematic view of a condensation and separation device for testing the pressurization activity of a carbon monoxide low-temperature shift catalyst.

In the figure: 1-gas inlet; 2, flat covering; 3, coiling a pipe; 4, an outer cylinder body; 5, an inner cylinder body; 6-condensation medium inlet; 7-gas outlet; 8, a pressure relief opening; 9-outlet for condensed medium; and 10, discharging a clean opening.

Detailed Description

The present invention will be further described with reference to the following embodiments and accompanying drawings.

Examples

Referring to the attached figure 1, the condensation and separation device for the pressurization and activity inspection of the carbon monoxide low-temperature shift catalyst mainly comprises a flat cover 2, an outer cylinder 4, a coil 3, an inner cylinder 5, a gas inlet 1, a gas outlet 7, a condensing medium inlet 6, a condensing medium outlet 9 and a purge outlet 10; an inlet and an outlet of a condensing medium are communicated with the outer cylinder body 4, and the outer cylinder body 4 is sealed by the flat cover 2; the gas inlet and outlet are communicated with the coil pipe 3, the coil pipe 3 is communicated with the inner cylinder 5, and the lower part of the inner cylinder 5 is provided with a clean-placing opening 10 and extends out of the outer cylinder 4.

In an embodiment, the flat lid 2 is provided with a pressure relief vent 8.

In the embodiment, the flat cover and the outer cylinder body are made of common stainless steel, and the coil pipe and the inner cylinder body are made of corrosion-resistant high-strength special alloy steel; the condensing medium is water.

The specific operation process comprises the following steps: during reduction, reducing gas enters the reactor through the vaporizer, and gas discharged from the reactor is cooled by the condenser and then is discharged through the water-sealed bottle. When the activity is measured, the raw material gas is desulfurized and cooled, then mixed with water (heated by a vaporizer to form water vapor) injected by a metering pump, and enters a reactor after heat preservation through a pipeline. And tail gas from the reactor enters a condenser condensation separation device. The condensing medium enters the cylinder body through a condensing medium inlet, exchanges heat with the gas in the coil pipe and is discharged through a condensing medium outlet; when the pressure is too high, the air can be discharged from the pressure relief port. The condenser separation device separates unreacted water and liquid impurities, and discharges the water and the liquid impurities through a purge port; after the tail gas is decompressed and enters a rotor flow meter for metering, one path of the tail gas enters an analysis system, and the other path of the tail gas is emptied after passing through a water seal bottle.

In the examples: the reducing gas is a mixed gas which consists of 3.0 to 5.0 percent of hydrogen and the balance of nitrogen.

The raw material gas is a mixed gas and consists of 2.5 to 4.0 percent of carbon monoxide, 14.0 to 20.0 percent of carbon dioxide and the balance of hydrogen and nitrogen (3: 1).

Introducing reducing gas into the reactor, wherein the space velocity of the reducing gas is 1000h^-1The system pressure is normal pressure. After 12h, the reduction was complete.

After the reduction is finished, the reducing gas is cut off, and the feed gas is connected. The reactor is pressurized to 2.0 MPa in 0.5 h, and the space velocity is increased to 4000h^-1(ii) a The temperature of the reactor is raised to 400 ℃ within 1h, the reactor is kept for 2h, and then the temperature is rapidly reduced to 200 ℃; simultaneously heating the vaporizer of the heat-insulating pipe, and controlling the temperature of the heat-insulating pipe to be about 150 ℃ and the temperature of the vaporizer to be about 250 ℃; and (3) starting the advection pump, after the pressure, the temperature, the airspeed of the raw material gas, the water-vapor ratio, the temperature of the vaporizer and the like of the reactor are stabilized for 1.5 to 2 hours, analyzing the volume fraction of the carbon monoxide in the raw material gas and the converted gas by using a gas chromatographic analyzer (or other carbon monoxide analyzers), and calculating the conversion rate of the carbon monoxide.

After the test is finished, the raw material gas main valve is closed, the system is emptied and depressurized, condensed water in the condenser is discharged at the same time, when the system is depressurized to normal pressure, the constant flow pump is closed, water injection is stopped, and finally, the system power supply is cut off and the condensed water main valve is closed.

The test results are as follows: the activity of the furnace catalyst No. 1 was 82.1%, and the activity of the furnace catalyst No. 2 was 83.5%, and the absolute difference of the results of the parallel measurements was not more than 2%.

Claims

1. A condensation separation device for the pressurization activity inspection of a carbon monoxide low-temperature shift catalyst is characterized by comprising a flat cover, an outer cylinder, a coil, an inner cylinder, a gas inlet, a gas outlet, a condensing medium inlet, a condensing medium outlet and a purge outlet; the condensation medium inlet and outlet are communicated with the outer cylinder body, and the outer cylinder body is sealed by a flat cover; the gas inlet and outlet are communicated with the coil pipe, the coil pipe is communicated with the inner cylinder body, and the lower part of the inner cylinder body is provided with a clean discharge opening and extends out of the outer cylinder body.

2. A condensation separation apparatus according to claim 1, characterized in that the flat cover is provided with a pressure relief vent.

3. A separator as claimed in claim 1, wherein said outer cylinder and said flat cover are made of stainless steel.

4. A condensate separator as claimed in claim 1, wherein said coil and inner shell are made of corrosion resistant high strength special alloy steel.

5. A condensate separation device as claimed in claim 1, characterized in that the condensing medium is water.