CN202063876U - Feeding device of coke tower - Google Patents

Abstract

The utility model provides a feeding device of a coke tower, comprising the coke tower, a feeding system and a gas inlet system; the tower top feeding system comprises an oil transfer line from a radiation section of a heating furnace, a tower top three-way valve, two isolation valves and a steam sweeping pipeline, wherein the oil transfer line is connected with the tower top three-way valve; one ends of the isolation valves are connected with the three-way valve through pipelines, and the other ends of the isolation valves are connected onto the coke tower from the top or the side surface of the upper part of the coke tower through the pipelines; the tower bottom gas inlet system comprises a high-temperature gas line, a measurement regulating valve, the two isolation valves and the pipelines, wherein one end of the measurement regulating valve is connected with the high-temperature gas line, and the other end of the measurement regulating valve is connected with the two isolation valves; and the other ends of the isolation valves are connected with the bottom of the coke tower through the pipelines. The device can overcome the defects of the vibration of the coke tower and lower yield of liquid products of an existing delayed coking device caused by the feeding from the bottom of the tower.

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 air inlet at the bottom of the enterprising material of a kind of coke Tata, the tower.

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 the 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.

The coke drum feeding unit that the utility model provides comprises coke drum and charging, inlet system, and coke drum is two.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, wherein 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 upper side insert coke drum.Inlet system comprises that High Temperature Gas line, metering variable valve, two shutdown valves and pipeline form at the bottom of the tower, an end that wherein measures variable valve is connected with the High Temperature Gas line, the other end is connected with two shutdown valves, and the other end of shutdown valve links to each other with the bottom of coke drum by pipeline.

Coke drum feeding unit of the present utility model is operated by following mode:

1) from the high-temperature material of coking heater radiation section through transfer line, cat head T-valve, shutdown valve with go into tower pipeline etc. and go into tower from the top of a coke drum, go into tower weight oil and carry out after the flash distillation unreacted heavy oil and stay and proceed reaction in the tower;

2) from the high-temperature gas of process furnace or interchanger through High Temperature Gas line, metering variable valve and shutdown valve with go into tower pipeline etc. and go into tower from the bottom of same coke drum;

3) after a coke drum is full of coke, at the bottom of cat head charging and the tower air inlet respectively at the bottom of cat head T-valve and tower shutdown valve switch to another coke drum, simultaneously with high-temperature steam to an end and the shutdown valve of the cat head T-valve that stops charging with go into the tower pipeline and purge, close corresponding shutdown valve then.

4) coke drum that has stopped charging by steam valve and water valve and shutdown valve and pipeline to this tower steam out for a short time, steam out greatly, little feedwater and big feedwater etc., carry out processes such as hydraulic decoking then.

Equipment described in the utility model is known in the present technique field.Shutdown valve is 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 upper side of coke drum, preferably goes into tower from the top.

Heavy oil described in the utility model is gone into the tower mode and is included but not limited to flow downward with tangential way along coke drum upper inner face.

High-temperature gas described in the utility model is water vapor, dry gas, rich gas, Sweet natural gas, gasoline fraction (C ₅～200 ℃), diesel oil distillate (180 ℃～350 ℃), light wax oil (350 ℃～440 ℃), nitrogen etc.

High-temperature gas described in the utility model can preferably adopt the coking heater heating by interchanger or/and the process furnace heating improves its temperature, and going into the tower temperature range is 450 ℃～550 ℃.

The utility model has following advantage:

1. the linear speed of inlet tower gas body at the bottom of the device may command tower of the present utility model, thereby the oil gas that makes coke drum middle and lower part heavy oit pyrolysis generate passes the linear speed in green coke hole to be reduced, 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 the material of coking heater radiation section from cat head or upper side, gasified and oil gas that cracking generates is discharged from cat head fast, thereby drawn up secondary reaction, improved the product distribution; Air inlet at the bottom of the tower has simultaneously reduced the reaction dividing potential drop of oil gas in the tower again, thereby has reduced the productive rate of dry gas and coke, has promptly increased the liquid receipts.

3. the small part air inlet 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. coke drum feeding unit of the present utility model is comparatively simple, and promptly the four-way valve of the old device of cancellation changes at the cat head of coke drum and newly establishes equipment such as high temperature tee joint valve, so cost of investment is lower.

5. the utility model not only is adapted to new device, old device is transformed too be fit to.

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: the charging of 1-coking tower, 2-transfer line, 3-T-valve, 4a, 4b-shutdown valve, 5a, 5b-coke drum, the 6-gas pipeline, 7-High Temperature Gas line, 8-measures variable valve, 9a, 9b, 11a, 11b-shutdown valve, go into the tower pipeline at the bottom of 10a, the 10b-tower, the 12-feedwater valve, 13-gives steam valve, 14-high-temperature gas.

Embodiment

As shown in Figure 1, from high temperature (450 ℃～520 ℃) heavy oil of coking heater radiation section as coking tower charging 1, coking tower charging 1 is gone into tower through transfer line 2, cat head T-valve 3 and shutdown valve 4a 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 6, and also the coke of cracking section heavy oil and generation is not stayed and proceeded pyrogenic reaction in the tower; Go into tower and at the bottom of High Temperature Gas line 7, metering variable valve 8, shutdown valve 9a and tower, go into tower pipeline 10a from the bottom of coke drum 5a from high temperature (450 ℃～550 ℃) gas 14 of interchanger or process furnace.The pressure of control coke drum cat head is 0.1MPa～1.0MPa.When coke drum 5a be full of defocused, from the High Temperature and Heavy Oil of radiation section switch to through T-valve 3 and shutdown valve 4b and pipeline carry out pyrogenic reaction among the coke drum 5b, high-temperature gas also switches among the coke drum 5b through going into tower pipeline 10b at the bottom of shutdown valve 9b and the tower simultaneously.Processes such as at this moment the coke drum 5a that stops charging going into tower pipeline 10a and steam out for a short time, steams out greatly at the bottom of giving steam valve 13 and feedwater valve 12 and shutdown valve 11a and tower, cold Jiao and bubble Jiao, after coke temperature is reduced to below 100 ℃ at the bottom of the coke drum 5a emptying water, hole, cut Jiao then, closing coke discharging mouth feeding steam behind the intact clearly coke of coke drum 5a carries out airtight, and then with high temperature oil hot air heating tower, standby, form an operation cycle cycle.

Claims (2)

1. coke drum feeding unit, this device comprises coke drum and charging, inlet system, coke drum is two, it is characterized in that: 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, wherein 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 upper side insert coke drum; Inlet system comprises that High Temperature Gas line, metering variable valve, two shutdown valves and pipeline form at the bottom of the tower, an end that wherein measures variable valve is connected with the High Temperature Gas line, the other end is connected with two shutdown valves, and the other end of shutdown valve links to each other with the bottom of coke drum by pipeline.

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