Keywords: production status and improvement measures of gas purification full negative pressure system
! Present situation of gas purification system
Our company's gas purification system is based on 29; 1 & lt； = Type 5
; (coke oven matching >? Circulating washing technology of the first phase of the project in
: AA 1 put into production in January @ The purification system is in half-load B gas treatment.
The quantity is 54.8 million (0 C-d status. The second phase of the project was put into production in January AA0.
The production and gas handling capacity reaches 80,000 (0 C'). From 5 1 1: year @ Cause
The increase of coke output makes the average production capacity of gas purification system reach.
84.8 million (can reach 0 C'B peak; 4:10,000 (0℃) overload transportation
Line status. For this reason @ we refer to the amount of cooling water and washing liquid, etc.
The corresponding adjustment of objectives has gradually formed a set of more mature management operations.
Method, to ensure the stable operation of gas purification system, each refers to
See table.
Because the aspirator of the full negative pressure gas purification process is arranged at the end
At the end, the whole process is in a low temperature state, effectively avoiding positive pressure work.
The problem of coal temperature rising behind the fan. In addition, in the suction room
Cooling devices such as fans and air conditioners are added to ensure the safety of the main motor.
Run at full load. The deacidification and ammonia distillation system also runs normally, ensuring biochemistry.
The wastewater reaches the standard and the washing system runs stably. "The existing problems and improvement measures.
After years of operation, the heat exchanger has been corroded to varying degrees.
Corrosion, internal leakage and blockage seriously affect the normal operation of the purification system. To this end, we added a plate heat exchanger with lean 6 and rich liquid.
A 6-cycle water plate heat exchanger for stripping water. And exchange the remaining ammonia water.
The heater was changed from tube to spiral plate. According to the flow rate and temperature of the lotion
At 7℃, pressure backwashing and purging, core replacement and other treatment measures were taken.
And the stable operation of the gas purification system is ensured. Some gas pipes also
The leakage point occurred due to local corrosion, and it operated normally after welding repair.
8.29 electric tar catcher tar catching efficiency decreased by 7, making the gas.
The tar content in oil is as high as 3: 2; & lt*! . To this end, 7 will be one of them.
The corona wire is changed from single strand to single strand 7 to ensure discharge.
The uniform heat preservation part of the porcelain pot is changed from one porcelain pot to three hoisting porcelain bottles,
Not only is the maintenance convenient, but also the stability of the corona wire is increased, which ensures that.
Stable operation of electric tar catcher. In April this year, due to the emergence of the incubator,
The magnetic column burst, corona disconnection and short circuit were repaired.
At present, the tar content in the gas after 7 electric tar traps has been reduced to
! 3*; & lt*! Below, the lowest value is only 4: = *; & lt*! .
8! Liquid oil causes equipment and pipelines to be blocked. The system
The degreasing process is concentrated in mechanized clarifier, primary cooler and electric coke catcher.
Refueling worker When the degreasing effect is not good, tar will be rich in liquid and remain with washing.
The remaining ammonia water is brought into the desulfurization rich solution, and then enters the deacidification and ammonia evaporation process.
It is easy to cause the blockage of tubular heat exchanger and plate heat exchanger. Aim at the top
Phenomenon, the following measures have been taken.
"9 Add one between the clarifier and the residual ammonia tank.
" & gt3*! Horizontal tank is used to remove oil by gravity settling of circulating ammonia water.
Tank, in the remaining ammonia tank and rich liquid tank, an inclined partition plate 7 is added.
Oil drain holes 7 are added at different heights of the tank wall for regular oil drain.
In order to remove oil, a new set of residual ammonia air flotation oil removal device was built.
The rate is 53? @A3？ 7 can also reduce the content of naphthalene in the system.
The residual ammonia water after oil removal by air flotation is sent to the desulfurization tower.
! The original design adopts fixed ammonia tower and volatile ammonia tower flash chamber pump.
Tar deposited at the bottom of the lower suction port 7 is easily sucked into the pipeline,
Causing the system to jam. After increasing the suction height of the pump, release it regularly.
Oil, greatly reducing the probability of blockage.
Improvement of 8 4 9 condensation process. There are two condensation tanks in the north and south.
Two submersible pumps, one in operation and one in standby. Now one more condensate tank is added in the north.
Self-priming pump, and the transformation of the corresponding pipeline, so that self-priming pump in groove cleaning and other special
Special operations can be changed to pump the condensate in the southern water tank.
Modification of 8 5 9 deacidification and ammonia distillation process. Add a rich-poor liquid tray.
Type a heat exchanger and a circulating water 6 stripping plate heat exchanger, reducing
The temperature of lean liquid and stripped water entering the rear heat exchanger decreases, and the temperature of the rear heat exchanger decreases.
The stage cooling load not only improves the preheating temperature of rich liquid, but also saves money.
Steam. Due to internal leakage caused by corrosion, the acid steam return pipe cannot be used.
When the Claus furnace is put out, there is no way for 7 acid steam to pass through. In order to avoid deacidification
The tower is evacuated and deflated, and installed at the top of deacidification tower! 53**
radiant tube
In the original design, only field valves were used for groundwater entering the new pool.
Door control, because of the change of water consumption in the production process, it is easy to cause new water
Is the pool full or empty? Therefore, a floating ball was installed on the water inlet pipe of the new pool.
The valve realizes the automatic control of liquid level, which not only avoids the waste of water,
But also can reduce the occurrence of accidents.
The bearing of deacidification lean liquid pump is internal circulation type, and the cooling medium is deacidification.
If the acidic water is interrupted instantly, the bearing will be damaged due to the rapid temperature rise.
After the cooling water system of lean liquid pump was transformed into soft water cooling, it never appeared again.
Bearing overheating phenomenon. Meanwhile, a standby deacidification tower is added.
When the sample 7 overhauls the deacidification tower, the system cannot be shut down, which lightens the inspection of the deacidification tower.
Influence of repair time on wastewater biochemical treatment system.
Modification of 8-GT9 washing process. Increase the circulation of alkali washing section in ammonia washing tower
Annular alkali flow meter, to accurately grasp the circulating alkali flow, to ensure that
Desulfurization efficiency of alkali washing section. The original design will be the condensate of each tracing steam,
Indirect steam condensate from benzene tower and condensate from steam pipe network are discharged.
The valve discharges water into the ditch. Now the condensate is concentrated in the fixed ammonium tower, which not only saves energy.
The ammonia tower steam is fixed to prevent steam leakage.
The residual ammonia water heat exchanger is changed from tubular to spiral plate, which not only
It can be cooled by circulating water or fresh water, which solves the cooling problem.
Insufficient water supply causes excessive temperature of residual ammonia water. Fu Jiang
The heat exchanger of ammonia water and semi-rich ammonia water is changed from tube type to spiral plate type,
Improve heat exchange efficiency, reduce the temperature of washing liquid, and ensure the purification of fingers.
Mark. The nozzle of benzene washing tower was changed to non-blocking nozzle, which improved the effect of benzene washing.
Rate.
Modification of 8a-9 aspirator. The main motor of this aspirator is made in China.
At the same time, a manual speed regulation system is installed. When the automatic control system appears,
In case of failure, 7 can be controlled manually.
! Improve production operation
The operation of 8 "9 electric tar catcher directly affects the gas quality.
Oil content, wash 7 regularly with hot ammonia water to prevent tar in the gas.
Attached to the precipitation electrode 7, and then marked with "5@23B. -Nitrogen protection insulation.
Box. Use clean gas when stopping nitrogen, and strictly switch.
When the system is switched on and off, water must be drained first to prevent water vapor from entering the insulation box.
Damage the porcelain jar.
8 2 9 Three primary coolers, two in operation and one in standby, are used for flushing downcomers regularly.
Adjust the circulating water in time to ensure that the gas gathering temperature is "℃"
23D 7 to reduce the blocking probability of the system.
8! This process uses. EF distributed control system to realize production.
The production is automatically adjusted, and the main measuring points are monitored by microcomputer. However, when adjusting the suction of the aspirator, the pressure of the riser must be observed at the same time.
Change. To do this, we added settings on the group screen and set the
Closely related measuring points are set in the same group = alarms and connections are also added.
Locking function to further improve operation control.
; 6< benzene tower adopts liquid phase feed, and the bottom of the tower is 54 >:? +Room
Turn on steam for heating. Naphthalene-rich benzene residue from benzene hydrogenation branch is sent to crude oil.
After the benzene section, the pipes of two benzene towers were seriously blocked due to naphthalene crystallization.
This blockage accident, now adding steam mixed heat pipe to the pipeline, has not yet appeared.
Excessive blockage phenomenon.
# There's a problem
; :< Remove and clean the filter screen in front of the tar magnetic pump frequently = Work.
Heavy workload and harsh environment.
; 1 & lt； In the process of separating water and phenol with sodium sulfate produced by tar refining.
Separated water and separated water from coke drum = Although several kinds of water are sent to the circulation system,
System scheme, but the emulsification of the system can not be ignored.
; 0< because the pressure relief position of the pressure regulating valve behind the supercharger is in the valve.
Later, due to the inability to adjust, there was a shutdown and valve repair, which led to Klaus.
The stove and ammonia decomposer put out the fire for several hours. When the supercharger stops unexpectedly,
The transmission shaft is often stuck by tar and cannot be opened normally.
; 6 < The microcomputer control system is equipped with two monitors = multiple times.
There is a crash, a black screen, lost information, and the keyboard can't be adjusted.
Elephant.
; There is still leakage and sulfur in the acid steam return pipe of 8 < Claus plant.
The exhaust gas analyzer can't work normally, and the ammonia decomposer is blocked.
The problem has not been completely solved.
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