CN107649471B

CN107649471B - Treatment method of styrene condensate of styrene storage tank

Info

Publication number: CN107649471B
Application number: CN201710875798.8A
Authority: CN
Inventors: 李宝华; 邢献才; 陆钰
Original assignee: Jiangsu Litian P&c Terminal Co ltd
Current assignee: Jiangsu Litian P&c Terminal Co ltd
Priority date: 2017-09-25
Filing date: 2017-09-25
Publication date: 2020-08-14
Anticipated expiration: 2037-09-25
Also published as: CN107649471A

Abstract

The invention discloses a treatment method of styrene condensate of a styrene storage tank, which relates to the technical field of cleaning of condensate on the inner wall of the styrene storage tank, wherein the storage tank adopts an arch-top type storage tank, an umbrella-shaped rib framework is arranged at the top of the storage tank and used for supporting the top of the storage tank, and the treatment method further comprises the following steps: pumping out the liquid styrene in the storage tank, and discharging and recovering; heating the interior of the storage tank to raise the temperature to above 60 ℃; cooling the heated storage tank to room temperature; and (3) sand blasting is carried out on the inner wall of the storage tank after the upright column and the rotary lifting ladder are erected, and sand is utilized to impact and strip the cooled condensate on the inner wall of the storage tank. After the storage tank is heated, the curing time of the styrene is obviously shortened, after the styrene is completely cured, the styrene is cooled down and cooled, the cured styrene can shrink after being cooled, the styrene hardened substance is flushed from the inner tank wall of the styrene, and the shoveling efficiency is greatly improved.

Description

Treatment method of styrene condensate of styrene storage tank

Technical Field

The utility model relates to a styrene storage tank inner wall cured substance washs technical field.

Background

Styrene (Styrene, C)₈H₈) The organic compound is formed by substituting one hydrogen atom of ethylene with benzene, the electron of vinyl is conjugated with benzene ring, is insoluble in water, is dissolved in ethanol and ether, and gradually undergoes polymerization and oxidation when exposed to air. Industrially, they are important monomers for synthetic resins, ion exchange resins, synthetic rubbers and the like.

Styrene storage when the jar is in, self polymerization can take place for this ethylene at room temperature, form thick column material, and styrene can slow gasification, also can self polymerization form thick column material when irritating a lateral wall etc. this thick column material can slow solidification, form the sclerosis thing, no matter be sclerosis thing or thick column material, the quality that all can influence styrene, when it adheres to the pipe wall, be difficult to clear away, among the current clearance method, mostly adopt in the jar to set up the scaffold, the method of artifical manual shovel, efficiency and low.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provide an efficient method for treating styrene condensate of a styrene storage tank.

In order to solve the technical problem, the utility model discloses a technical scheme is: a styrene storage tank styrene condensate treatment method, wherein the storage tank adopts an arch-top type storage tank, an umbrella-shaped rib framework is arranged at the top of the storage tank and used for supporting the tank top, and the method also comprises the following steps:

(1) completely pumping out the liquid styrene in the storage tank, and discharging and recovering the liquid styrene;

(2) heating the interior of the storage tank to raise the temperature to over 60 ℃ so as to quickly cure the viscous styrene polymer in the tank, wherein the heating time lasts for 24-36 hours;

(3) cooling the heated storage tank to normal temperature;

(4) and then, sand blasting is carried out on the inner wall of the storage tank, and the cooled condensate on the inner wall of the storage tank is impacted and stripped off the inner wall of the storage tank by utilizing sandstone.

Further, when the storage tank is heated, low-pressure steam is adopted for heating, and 120-degree hot steam is continuously introduced into the storage tank.

Furthermore, when the storage tank is cooled, a ventilation or water cooling mode is adopted.

Furthermore, when the inner wall of the storage tank is subjected to sand blasting, high-pressure airflow is mixed in the sand, and the initial velocity of the sand sprayed from the outlet of the sand blasting gun is more than 200 m/s.

Furthermore, the lifting ladder is arranged in the storage tank, can rotate and move up and down along the axis of the storage tank, and is used for moving the sand blasting gun.

Further, jar body bottom is provided with the opening and seals this open-ended door body, its characterized in that: the lifting device comprises a tank body, a fixed guide shaft, a lifting ladder, a sleeve, a winch and a lifting rope, wherein the fixed guide shaft, the lifting ladder, the sleeve, the lifting rope and the lifting rope are vertically arranged, a through hole for the fixed guide shaft to pass through is formed in the top of the tank body, the lifting ladder is fixed on the sleeve, the sleeve is sleeved on the fixed guide shaft, a rope fixing device is arranged on the top of the fixed guide shaft, a fixed pulley is arranged on the rope fixing device, the winch is fixedly arranged on the lifting ladder, one end of the lifting rope is fixed on the lifting ladder, the other end of the lifting rope is connected with the winch after passing through the fixed pulley, a pull rope is arranged at the end part, close to the inner wall of the tank body, of the lifting ladder and close to the inner wall of the storage tank, and a fixed rope is arranged at the top of the sleeve, the base is fixed on a fixed guide shaft, a lower seat ring is fixed on the base, a plurality of steel ball fixing positions are arranged on a steel ball retainer, steel balls can be arranged in the steel ball retainer in a rolling mode on the steel ball fixing positions, the lower seat ring, an upper seat ring and the steel ball retainer are all sleeved on the fixed guide shaft, the steel ball retainer is arranged between the upper seat ring and the lower seat ring, a fixed pulley is arranged on the upper seat ring, the upper seat ring and the lower seat ring are provided with grooves corresponding to the steel balls, the upper top point and the lower top point of each steel ball are respectively arranged in the grooves of the upper seat ring and the lower seat ring, a plurality of screw holes distributed along the radial direction of the fixed guide shaft are arranged on the base and the fixed guide shaft, the base is fixed on the fixed guide shaft through bolts, flange plates are arranged at.

According to the technical scheme, after the storage tank is heated, the curing time of the first styrene is obviously shortened, secondly, after the styrene is completely solidified, the styrene is cooled, the solidified styrene can shrink after being cooled, and after the styrene shrinks, gaps exist on the surface of the tank body, in particular to an arch-top storage tank, because the umbrella-shaped ribbed slab framework is arranged at the top, when the styrene is in a viscous state, the viscous styrene self-polymer can be adhered and concentrated at the two sides of the ribbed slab framework under the action of gravity and tension, and flows to the inner side wall of the tank along the rib plate framework, so that the cured styrene hardening substances are distributed in a strip shape, because the gap exists, therefore very convenient carry out the shovel and remove, let in the mixture of sand grain and high-pressure air again simultaneously and spout the jar inner wall, wash the remaining styrene sclerosis thing from the styrene inner tank wall, improve the shovel efficiency greatly.

Detailed Description

The method adopts an arch-top storage tank, an umbrella-shaped rib plate framework is arranged at the top of the storage tank and used for supporting the tank top, and also comprises the following steps,

(1) pumping out the liquid styrene in the storage tank, and discharging and recovering;

(2) heating the interior of the storage tank to raise the temperature to more than 50 degrees, preferably 68 degrees, in the temperature range, the residual styrene on the tank wall can be subjected to violent polymerization and implosion, the viscous styrene polymer is quickly cured, the heating time lasts for 24-36 hours, when the storage tank is heated, hot steam is adopted for heating, 120-degree hot steam is continuously introduced into the storage tank, and the hot steam is supplied by a low-pressure heat supply pipe network.

(3) The heated storage tank is cooled to normal temperature, and in order to accelerate the cooling speed, a water cooling mode can be adopted besides ventilation cooling, namely, cooling water is sprayed on the inner wall of the tank, and the cooling water can be fire water or common tap water and the like.

(4) And then, sand blasting is carried out on the inner wall of the storage tank, and sand is used for impact stripping of the cooled condensate on the inner wall of the storage tank. When the sand is blasted to the inner wall of the storage tank, the sand is blasted at the initial speed of more than 200m/s from the outlet of the sand blasting gun, the lifting ladder is arranged in the storage tank and can rotate and move up and down along the axis of the storage tank, and the sand blasting gun is moved by the lifting ladder. The concrete structure of the elevator is as shown in fig. 2, 3 and 4, the bottom of the tank body 6 is provided with an opening 1 and a door body for sealing the opening, the storage tank further comprises a vertically arranged fixed guide shaft 9, the elevator 4, a sleeve 8, a winch 7 and an elevator rope 10, the top of the tank 6 is provided with a via hole for the fixed guide shaft to pass through, the elevator 4 is fixed on the sleeve 8, the sleeve 8 is sleeved on the fixed guide shaft 9, the top of the fixed guide shaft 9 is provided with a rope fixing device 11, the rope fixing device 11 is provided with a fixed pulley 18, the winch 7 is fixedly arranged on the elevator 4, one end of the elevator rope 10 is fixed on the elevator 4, the other end of the elevator rope passes through the fixed pulley and then is connected with the winch 7, and the end part of the elevator 4 close to the inner wall of the tank body is provided with a. The top of the sleeve 8 and the end part of the elevator 4 close to the inner wall of the storage tank are provided with fixed ropes.

Rope fixing device 11 can wind the rotatory setting of fixed guiding axle, therefore when the elevator rotated, the lifting rope can rotate together, when the lifting rope was many, the lifting rope can not twine together. In order to realize the rotation of the lifting rope, the following structure can be adopted: as shown in fig. 2, the rope fixing device 11 includes a base 17, a lower seat ring 16, a steel ball 12, a steel ball retainer 14 and an upper seat ring 15, the base 17 is fixed on the fixed guide shaft 9, the lower seat ring 16 is fixed on the base 17, the steel ball retainer 12 is provided with a plurality of steel ball fixing positions, the steel ball 12 can be arranged on the steel ball fixing positions in the steel ball retainer in a rolling manner, the lower seat ring 16, the upper seat ring 15 and the steel ball retainer 14 are all sleeved on the fixed guide shaft 9, the steel ball retainer 14 is arranged between the upper seat ring and the lower seat ring, and a fixed pulley 18 is arranged on the upper seat ring 15. Grooves are arranged at the positions of the upper seat ring 15 and the lower seat ring 16 corresponding to the steel balls, and the upper top points and the lower top points of the steel balls are respectively positioned in the grooves of the upper seat ring and the lower seat ring.

A plurality of screw holes distributed along the radial direction of the fixed guide shaft are arranged on the base 17 and the fixed guide shaft 9, and the base 17 is fixed on the fixed guide shaft 9 through bolts 13. The top and the bottom of the fixed guide shaft 9 are provided with flange plates 2 which are fixed at the top and the bottom of the tank body.

Styrene is at different temperatures, the self-polymerization speed is different, at normal temperature, the styrene on the inner wall of the storage tank is completely cured, the time is about three months to 9 months, when the temperature exceeds 50 degrees, the self-polymerization is obviously accelerated, fig. 1 is a change curve of the polymer content with time at different temperatures, the self-polymerization of the styrene is related to the temperature, air (oxygen content) and peroxide, the styrene is generally preferably stored below 25 ℃, the storage period is preferably one month, and the styrene is also related to the polymerization inhibitor, nitrogen seal and the original polymer content.

It can be seen from the above table that when the temperature reaches 50 degrees, its curing time is shortened obviously, after styrene solidifies completely, cool down to it, the styrene after the solidification can shrink after cooling, there is the gap in the surface of the jar body in the styrene condensate after the shrink, especially to vault type storage tank, because the top has set up umbelliform muscle network board skeleton, styrene is when gluing the state, because gravity and tension effect, viscous styrene autopolymer can be followed and concentrated on muscle network board skeleton, and flow to the tank inner wall along the skeleton, therefore the styrene sclerosis thing is the strip and distributes after the solidification, consequently conveniently carry out the shovel, at this moment, the rethread sand grain sprays the tank inner wall with the mixture of highly-compressed air, the styrene sclerosis thing is peeled off from the impact of styrene inner tank wall.

Set up the time that the scaffold frame can be taken to the companion ladder less greatly, operating personnel stands and can carry out the sandblast with the jar wall on the companion ladder, greatly reduced cost of labor.

Claims

1. A styrene storage tank styrene condensate treatment method, wherein the storage tank adopts an arch-top type storage tank, an umbrella-shaped rib framework is arranged at the top of the storage tank and used for supporting the tank top, and the method also comprises the following steps:

(1) pumping the liquid styrene out of the storage tank;

(2) heating the interior of the storage tank to raise the temperature to over 60 ℃ so as to solidify the viscous styrene polymer in the tank, wherein the heating time lasts for 24-36 hours;

(3) cooling the heated storage tank to room temperature;

2. The method for treating styrene cured products for styrene storage tanks according to claim 1, wherein the method comprises the steps of: when the storage tank is heated, hot steam is adopted for direct heating, and the hot steam of 120 degrees is continuously introduced into the storage tank.

3. The method for treating styrene cured products for styrene storage tanks according to claim 1 or 2, wherein: when the storage tank is cooled, normal temperature cooling water is sprayed to the inner wall of the storage tank by adopting a natural ventilation or water cooling mode.

4. The method for treating styrene cured products for styrene storage tanks according to claim 1 or 2, wherein: when the inner wall of the storage tank is blasted, high-pressure airflow is mixed in the sand, and the initial velocity of the sand sprayed from the outlet of the sand blasting gun is more than 200 m/s.

5. The method for treating styrene cured products for styrene storage tanks according to claim 4, wherein the method comprises the steps of: the lifting ladder is arranged in the storage tank, can rotate and move up and down along the axis of the storage tank, and is used for moving the sand blasting gun.

6. The method for treating styrene cured products for styrene storage tanks according to claim 5, wherein the method comprises the steps of: jar body bottom is provided with the opening and seals this open-ended door body, its characterized in that: the lifting device comprises a tank body, a fixed guide shaft, a lifting ladder, a sleeve, a winch and a lifting rope, wherein the fixed guide shaft, the lifting ladder, the sleeve, the lifting rope and the lifting rope are vertically arranged, a through hole for the fixed guide shaft to pass through is formed in the top of the tank body, the lifting ladder is fixed on the sleeve, the sleeve is sleeved on the fixed guide shaft, a rope fixing device is arranged on the top of the fixed guide shaft, a fixed pulley is arranged on the rope fixing device, the winch is fixedly arranged on the lifting ladder, one end of the lifting rope is fixed on the lifting ladder, the other end of the lifting rope is connected with the winch after passing through the fixed pulley, a pull rope is arranged at the end part, close to the inner wall of the tank body, of the lifting ladder and close to the inner wall of the storage tank, and a fixed rope is arranged at the top of the sleeve, the base is fixed on a fixed guide shaft, a lower seat ring is fixed on the base, a plurality of steel ball fixing positions are arranged on a steel ball retainer, steel balls can be arranged in the steel ball retainer in a rolling mode on the steel ball fixing positions, the lower seat ring, an upper seat ring and the steel ball retainer are all sleeved on the fixed guide shaft, the steel ball retainer is arranged between the upper seat ring and the lower seat ring, a fixed pulley is arranged on the upper seat ring, the upper seat ring and the lower seat ring are provided with grooves corresponding to the steel balls, the upper top point and the lower top point of each steel ball are respectively arranged in the grooves of the upper seat ring and the lower seat ring, a plurality of screw holes distributed along the radial direction of the fixed guide shaft are arranged on the base and the fixed guide shaft, the base is fixed on the fixed guide shaft through bolts, flange plates are arranged at.