CN201864694U

CN201864694U - Coke drum feeding device

Info

Publication number: CN201864694U
Application number: CN2010205953379U
Authority: CN
Inventors: 李和杰; 黄新龙; 徐江华; 王辰涯; 顾月章; 方长生; 王洪彬
Original assignee: China Petroleum and Chemical Corp; Sinopec Luoyang Petrochemical Engineering Corp
Priority date: 2010-11-08
Filing date: 2010-11-08
Publication date: 2011-06-15
Anticipated expiration: 2020-11-08

Abstract

The utility model provides a coke drum feeding device, which solves the technical problems of vibration of a coke drum, low yield of liquid products and the like due to the fact that an existing delayed coking unit adopts a bottom feeding mode. The coke drum feeding device comprises a coke drum and a feeding system. The feeding system comprises a drum top feeding system and a drum bottom feeding system. The drum top feeding system and the drum bottom feeding system respectively comprise a transfer line, a three-way valve, an isolating valve and a steam purging pipeline, the transfer line is connected with the three-way valve, one end of the isolating valve is connected with the three-way valve through a pipeline while the other end of the isolating valve is connected into the coke drum from the top of or the upper portion of the lateral side of or the bottom of the coke drum via a pipeline, and the steam purging pipeline is connected with a pipeline which connects the three-way valve, the isolating valve and the coke drum. The coke drum feeding device not only reduces or completely avoids vibration of the coke drum but reduces carrying capacity of coke powder, reduces coking at the bottom of a fractionating tower and increases liquid yield.

Description

A kind of coke drum feeding unit

Technical field

The utility model relates to a kind of coke drum feeding unit, relates in particular to the device of the upper and lower charging of a kind of coke drum.

Background technology

Along with the heaviness of coking charging and poor qualityization, High Temperature and Heavy Oil is carried out pyrogenic reaction and is very easily generated shot coke in coke drum, if employing traditional easily cause the vibrations of coke drum from the mode of coke drum bottom charging, bring potential safety hazard to the operation of coker.Its reason is that the coke of inferior heavy oil generation is comparatively loose, in coke drum, easily subside, fall into the green coke passage, and the high-temperature material linear speed that enters from coke drum bottom is higher, and a large amount of oil gas that heavy oit pyrolysis generates pass the green coke passage, impel coke granule and oil gas to produce collision, thereby cause the vibrations of coke drum.For avoiding the generation of this phenomenon, the measure that existing apparatus is taked has: the one, and improve the character of coker feed, but be subjected to the into restriction of factory's oil property; The 2nd, relax operational condition, as improving recycle ratio operation etc., but bring liquid to receive the lower and more high drawback of power consumption of polymer processing.

Patent CN101638585A discloses a kind of delayed coking method, and material enters coke drum from the top of coke drum and carries out pyrogenic reaction in this method.This method has been avoided the cold and hot loop cycle of coke drum, has prolonged the work-ing life of coke drum.But go into the not concrete introduction of tower from the top of coke drum by what equipment and pipeline.

The utility model content

For drawback such as overcome that coke drum that existing delayed coking unit brings because of charging at the bottom of tower shakes and liquid product yield is lower, the utility model provides a kind of coke drum feeding unit.This device comprises coke drum and feed system, and wherein feed system comprises feed system at the bottom of cat head feed system and the tower.The cat head feed system comprises from the transfer line of process furnace radiation section, cat head T-valve, two shutdown valves and steaming out pipeline, transfer line links to each other with the cat head T-valve, shutdown valve one end links to each other with T-valve by pipeline, the other end by pipeline from the coke drum top or top, side insert coke drum; The steaming out pipeline is connected with the pipeline that is connected T-valve, shutdown valve and coke drum.Feed system comprises T-valve at the bottom of another transfer line from the process furnace radiation section, the tower, two shutdown valves and steaming out pipeline at the bottom of the tower, transfer line links to each other with T-valve at the bottom of the tower, shutdown valve one end links to each other with T-valve by pipeline, and the other end inserts coke drum by pipeline from coke drum bottom; The steaming out pipeline is connected with the pipeline that is connected T-valve, shutdown valve and coke drum.

Coke drum feeding unit of the present utility model is operated as follows:

1) high-temperature material that accounts for its charging 50%～75% from the coking heater radiation section is through transfer line, cat head T-valve, shutdown valve with go into tower pipeline etc. and go into tower from the top or the top, side of a coke drum, goes into tower weight oil and carries out after the flash distillation unreacted heavy oil and stay and proceed reaction in the tower;

2) high-temperature material that accounts for its charging 25%～50% from coking heater radiation section T-valve, shutdown valve and go into tower pipeline etc. and go into tower at the bottom of another transfer line, tower from the bottom of same coke drum, going into tower weight oil carries out pyrogenic reaction;

3) after a coke drum is full of coke, at the bottom of cat head charging and the tower charging respectively at the bottom of cat head T-valve and tower T-valve switch to another coke drum, with high-temperature steam pipeline and the shutdown valve that stops charging being purged simultaneously, close shutdown valve then.

Equipment described in the utility model is known in the present technique field.Shutdown valve is a ball valve, or stopcock.High-temperature material from process furnace described in the utility model is gone into tower (the above position of foam layer) from the top or the top, side of coke drum.

The utility model has following advantage:

1. device of the present utility model has reduced the linear speed of going into the tower material at the bottom of the tower, and reduced the void tower linear speed of coke drum bottom, the linear speed that the oil gas that makes coke drum middle and lower part heavy oit pyrolysis generate passes the green coke hole reduces greatly, not only alleviate or avoided fully the vibrations of coke drum, and alleviated the amount of carrying of coke powder, alleviated the coking at the bottom of the fractionation Tata, also alleviated the coking of heating furnace tube, promptly prolonged the cycle of operation of device because of the improvement of turning oil quality.

2. go into tower from most of material of coking heater radiation section from cat head or top, side, gasified and oil gas that cracking generates is discharged from cat head fast, thereby drawn up secondary reaction, improved the product distribution, promptly reduce the productive rate of dry gas and coke, increased the liquid receipts.

3. the small part charging is arranged at the bottom of the tower, can make to guarantee in the tower that the green coke passage is arranged, be convenient to the decoking of coke drum.

4. the two bursts of chargings in the top of coke drum feeding unit of the present utility model or top, side and bottom have been saved the high temperature variable valve respectively from the different pipelines of furnace outlet, have avoided the coking of variable valve and malfunctioning, help the safe operation of device.

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail, but do not limit use range of the present utility model.

Description of drawings

Fig. 1 is the synoptic diagram of the utility model coke drum feeding unit.

Among the figure: 1,6-transfer line, 2, at the bottom of the 7-tower, the cat head T-valve, 3a, 3b and 8a, 8b-cut off

Valve, 4a, 4b-pipeline, 5a, 5b-coke drum, 9-gas pipeline.

Embodiment

As shown in drawings, from coking heater radiation section at least 2 tunnel, high temperature (450 ℃～520 ℃) heavy oil that is generally 3 road furnace tubings mixes through transfer line 6, cat head T-valve 7 and shutdown valve 8a goes into tower from the top of coke drum 5a, the oil gas that gasification and cracking generate with mix from the oil gas under the tower after discharge from cat head fast, oil gas goes separation column to carry out fractionation through gas pipeline 9, and also the coke of cracking section heavy oil and generation is not stayed and proceeded pyrogenic reaction in the tower; And go into tower from the bottom of coke drum 5a from another strand of coking heater radiation section (being generally 1 tunnel, maximum 2 tunnel mixing of radiation section outlet) high temperature (450 ℃～520 ℃) heavy oil T-valve 2 and shutdown valve 3a and pipeline 4a at the bottom of transfer line 1, tower.The pressure of control coke drum cat head is 0.1MPa～1.0MPa.When coke drum 5a is full of defocused, switch to through T-valve 2 at the bottom of cat head T-valve 7 and the tower from two strands of heavy oil of radiation section and to carry out pyrogenic reaction among the coke drum 5b, and processes such as coke drum 5a steams out for a short time, steams out greatly, cold Jiao and bubble Jiao, after coke temperature is reduced to below 100 ℃ at the bottom of the tower 5a emptying water, hole, cut Jiao then, behind the intact clearly coke of coke drum 5a, close the coke discharging mouth and feed the high-temperature oil gas preheating, standby then, form an operation cycle cycle; Two strands of heavy oil are after switching, and cat head heavy oil enters among the coke drum 5b through shutdown valve 8b and reacts, and heavy oil enters among the coke drum 5b through shutdown valve 3b and pipeline 4b and reacts at the bottom of the tower.

Claims

1. coke drum feeding unit, comprise coke drum and feed system, it is characterized in that: feed system comprises feed system at the bottom of cat head feed system and the tower, the cat head feed system comprises from the transfer line of process furnace radiation section, cat head T-valve, two shutdown valves and steaming out pipeline, transfer line links to each other with the cat head T-valve, shutdown valve one end links to each other with T-valve by pipeline, the other end by pipeline from the coke drum top or top, side insert coke drum, the steaming out pipeline is connected with the pipeline that is connected T-valve, shutdown valve and coke drum; Feed system comprises T-valve at the bottom of another transfer line from the process furnace radiation section, the tower, two shutdown valves and steaming out pipeline at the bottom of the tower, transfer line links to each other with T-valve at the bottom of the tower, shutdown valve one end links to each other with T-valve by pipeline, the other end inserts coke drum by pipeline from coke drum bottom, and the steaming out pipeline is connected with the pipeline that is connected T-valve, shutdown valve and coke drum.

2. coke drum feeding unit according to claim 1 is characterized in that: described shutdown valve is ball valve or stopcock.