SU1243802A1 - Method of operation of device for hardening synthesis gas - Google Patents

Description

The invention relates to chemical technology and can be used for quenching synthetic products, for example, in the production of ammonia and methanol. .

The purpose of the invention is to increase efficiency by stabilizing the temperature of the gas in modes other than nominal.

The drawing shows a device for quenching synthesis gas, carrying out the proposed method.

A device for quenching synthesis gas A comprises a housing 1 in which pipes 2 of a heat exchange surface with inlet and outlet headers 3 and 4 are placed, equipped with respectively 5 and 6 branch pipes for gas inlet and outlet. The outlet part of the pipes 2 is enclosed in the casing 7, which is connected by a window 8 with the cavity of the housing 1. The casing 7 is equipped with a cooling water supply nozzle, and the housing 1 with 10, 11 and 12 nozzles respectively for cooling water supply, drainage mixture and circulating water supply. The pipes 9 and 10 of the water supply are connected by pipelines 13 and 14 to the collector 15 of the feed pump 16, equipped with the regulating body 17, Pipe I4 is equipped with the IS regulating body, whose actuator 19 is connected by a pulse line 20 to the sensor 21 for measuring the gas temperature at the outlet of the housing 1 .

The proposed method is carried out as follows.

The synthesis gas through the pipe 5 enters the inlet manifold 3, passes through pipes 2, as a result of which it is quenched, and through the collector 4 and the pipe 6 is withdrawn from the device for further processing.

One part of the water (main) from the collector 15 is fed by the feed pump 16 through the pipe 13 through the pipe 9 to the housing 7, passes through it and through the window 8 enters the strip of the housing 1. Another part of the water through the pipeline 14 is fed through the pipe 10, the casing 7, into the housing 1, where it, being mixed with the water in it, is heated to the saturation temperature. Heat generated by water

438022

steam together with circulating water. is discharged into a separator (not shown), where the steam is separated from the water, which through pipe 12 returns again

5 in the case. Circulating water forms a natural circulation circuit. The total flow rate of water supplied from the pump 16 is regulated depending on the amount of produced

 About steam regulatory authority 17. By

the water level in the separator when the mode changes (flow rate or temperature of the synthesis gas) changes the gas temperature at the outlet of the mouth of the device. At the same time, from the temperature sensor 21 comes from the impulse line 20 a command signal to the actuator 19 of the regulator 18, which changes the ratio of the flow rate of water entering the housing 1 and the casing 7. Changing the flow rate of water entering the housing 1 leads to a change in temperature (ut) between the synthesis gas 25 and the water in the casing 7 and, consequently, to a change in heat perceived by water from the pipes 2 enclosed in the casing 7, which ensures the maintenance of the gas temperature at a given

Level 30.

Example 1. 140,000 syngas enters the Gas Quenching Device at 400 ° C and pressure

20

329 kgf / cm. Passing the pipe 2, the gas 35 leaves the housing G with temperature and is sent for further processing.

Cooling water with a temperature of 75 ° C and a pressure of 40 kgf / cm and in quantity. 36 t / h, which corresponds to the heat balance, from the collector i5 pump 16 flows through pipelines 13 and 14 through pipes 9 and 10, respectively, into the casing 7 and the casing 1. The casing 7 receives 30 t / h of water, and the casing 1 - 6 t / h, which corresponds to a ratio of 5: 1 (this mode corresponds to the nominal operation of the device). The flow of water entering the casing passes in the annular space 5 and is heated to a saturation temperature of 250 ° C and through the window 8 enters the cavity of the housing 1, where it mixes with the water in this cavity. The second stream of water entering directly into the housing 1 is mixed with water leaving the window 8,

acquiring the temperature on the scene. Upon further contact of water with the heat exchange pipes 2, not enclosed in the casing 7, vaporization occurs. 36 t / h of steam together with water in the form of a steam-water mixture through pipes 11 is withdrawn into a separator, where it is separated from water, which returns to housing I through pipes 12. As in the casing 7, countercurrent movement of water and gas occurs, conditions for cooling it to a temperature below the water saturation temperature.

During operation, the flow rate and the gas temperature at the inlet to the housing

one

vary accordingly to

3 / / J- / h o

134000 and 390 C.

The gas temperature at the device exit drops below 195 ° C, and the water level in the separator rises. The water level sensors in the separator (not listed) and the gas temperature at the outlet of the device, affecting the regulators 17 and 18, change the total flow of water coming from the pump 16, and the ratio of the flow of water coming correspondingly1: editor A. Dolynich

Compiled by N.Katsovska. Tehred V. Kadar Proof-reader I. Erdeyi

Order 3740/9 Circulation 527 Subscription

VNIR-SHI USSR State Committee

for inventions and discoveries. 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

0

five

into the housing -1 and the housing 7, to obtain a normal level in the separator and the gas temperature at the outlet of the device.

The total amount of water is 32.8 t / h, 26.0 t / h enters the casing 7, and 1 6.8 t / h into the casing 1, which corresponds to a ratio of 3.8: 1.

Example 2. The nominal operation of the device is the same as in example 1 ..

During operation, the flow rate and gas temperature at the entrance to the housing 1 varies, respectively, to 149,000 nm / h and 415 ° C, which entails an increase in the gas temperature at the outlet of the device above 195 ° C and a change in the water level in the separator, re. The level and temperature sensors, acting on regulators 17 and 18, change the flow rate of the water to obtain a temperature and a predetermined water level in the separator. In this case, the total amount of water coming from the pump 16 is 39.3 tons / 4, in the casing 7 33.9 tons / h, and the 3rd case 1 is 5.4 tons / h, which corresponds to a cost ratio of 6.3: one.

Claims (1)

METHOD OF OPERATION OF A DEVICE FOR HAZARDING SYNTHESIS GAS by passing gas through pipes located in the housing and provided with a casing at the outlet communicating with the cavity of the housing, supplying cooling water to the housing and its subsequent removal together with the generated steam from the housing, Most importantly, in order to increase profitability by stabilizing the gas temperature during operation at different operating conditions, part of the cooling water is supplied directly to the housing, bypassing the casing, and at the same time, the ratio of the flow rates of the water dissolved in the momentum of the gas temperature at the outlet Device for § roystva. SU .1243802