A cold coke flash degassing treatment device and method

Abstract

The invention discloses a coke cooling water charge flash evaporation degassing apparatus and a method thereof. The apparatus comprises a coke tower, a coke cooling water charge degassing tank, a coke cooling water charge tank, a coke cooling water tank, a tail gas cooler, a tail gas separated water tank and a tail gas desulphurization device; the bottom of the coke tower is connected with the coke cooling water charge degassing tank, the top of the coke cooling water charge degassing tank is connected with the tail gas cooler, and the bottom of the coke cooling water charge degassing tank is connected with the coke cooling water charge tank; the coke cooling water charge tank is connected with a cooled coke transfer pump, then a pipeline is divided into two branches, one branch is connected with the inlet of the tail gas cooler, and the other branch is connected with the coke cooling water tank; and the outlet of the tail gas cooler is connected with the tail gas separated water tank, the top of the tail gas separated water tank is connected with the tail gas desulphurization device, the bottom of the tail gas separated water tank is connected with the coke cooling water tank, and the lower outlet of the coke cooling water tank is connected with the coke tower. The apparatus is simple, is safe and reliable to operate, solves the problems of steam spreading above a coke pool in the coke cooling water charge process of a delayed cooking apparatus and direct discharge of sulfides in coke cooling water to the atmosphere, and benefits improvement of the working environment of the delayed coking apparatus.

Description

technical field [0001] The invention relates to the field of delayed coking, and more particularly, relates to a cold coke water release flash degassing treatment device and method. Background technique [0002] Delayed coking is the main means of processing low-quality heavy oil in refineries. As a continuous production and intermittent operation process, there are generally at least two coke towers. The through valve switches the raw oil to another coke tower corresponding to it to ensure continuous coke production. The coke tower performs operations such as coke cooling, coke cutting and preheating. The purpose of the cold coke operation is to cool the high-temperature coke in the coke tower to achieve the coke cutting condition, which mainly includes steps such as steam blowing, water supply, and water release. Steam blowing is to blow steam from the bottom of the coke tower to the tower to strip the oil and gas in the coke, so that the coke forms a multi-void structure...

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Problems solved by technology

[0003] At present, the cold coke water discharge process commonly used in foreign countries is to discharge water directly to the coke pond. The main process is as follows figure 1 As shown, the cold coke discharge water is directly put into the coke pool without treatment, which mainly has the following two disadvantages: (1) The initial temperature of the cold coke discharge water is relatively high (about 100°C), and the cold coke hot water is directly put into the coke pool , due to the gasification of water, it is easy to cause steam to diffuse; (2) due to the high water level of the cold coke water in the coke tower, and there is a certain back pressure on the top of the coke tower during cold coke (US environmental protection requires less than 3 psig when water is released), A small amount of sulfide and non-condensable gas dissolved in the hot water of cold coke are discharged to the atmosphere together with the water release

[0004] The domestic cold coke water discharge process is attached figure 2 As shown, the cold coke discharge water directly goes to the cold coke water discharge tank, but it also has the following disadvantages: (1) the cold coke water treatment process is more complicated, the investment is higher, and the operation is more complicated; (2) the cold coke water tank is usually larger in volume Large (greater than 2000m 3 ), the design pressure is only 6kPag, the temperature is high when the cold coke is discharged, and the flow rate changes greatly, and the impact on the tank is easy to cause the deformation of the tank body; (4) The frequency of cleaning the cold coke water tank is relatively high, the labor intensity is high, and the coke cleaning cost is high;

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