CN213542080U - Air tightness device for skid-mounted cold box - Google Patents

Abstract

An air-tight device for a skid-mounted cold box comprises a hollow square steel support which is vertically arranged, an upper cross beam, a middle cross beam and a lower cross beam which are connected with the square steel support, through holes communicated with the upper cross beam, the middle cross beam and the lower cross beam are respectively arranged among the square steel bracket and the upper cross beam, the upper and lower sides of the joint of one side of the middle cross beam and the square steel bracket are respectively provided with an upper structural beam which is arranged obliquely upwards and a lower structural beam which is arranged obliquely downwards, and the joint is respectively provided with a through hole which is communicated with the upper structural beam and the lower structural beam, used for the circulation of gas, the beam bodies of the upper cross beam, the middle cross beam, the upper structural beam and the lower structural beam are respectively provided with a through hole, the utility model discloses an ingenious structural design has retrencied the inner structure of sled dress cold box, optimizes the installation space in the cold box, utilizes cold box body structure to develop and install in the structure of an organic whole with the gas tightness.

Description

Air tightness device for skid-mounted cold box

Technical Field

The utility model provides an air tightness device for sled dress cold box, makes the cold box can supply dry nitrogen gas uninterruptedly, maintains the equilibrium of cold box internal and external pressure differential, this belongs to air separation plant's safety facility technical field.

Background

The cold box structure of the air separation plant corresponds to the outer shell of a cryogenic vessel. In both the medium-and large-sized air separation plants and the small-sized air separation plants, the structure of the cold box needs to be designed in a sealed type in order to reduce the cold loss of the apparatus. That is, the cold box is almost a welding structure of the framework and the cover plate except the access hole. Then, the air separation cold box is filled with cold insulation material, namely pearlife. Because the gaps among the pearlife particles are filled with air, after the air separation equipment is operated, the equipment in the tower is in a low-temperature state, and the temperature of the cold insulation material is reduced. As the volume of the gas inside is reduced, a negative pressure will be formed inside the cold box. To prevent the enclosure from being deflated, the cold box is filled with a dry inert gas, such as nitrogen or dirty nitrogen, to maintain a slight positive pressure within the cold box.

The traditional sealer pipeline generally adopts a carbon steel pipeline of DN25-DN50, the carbon steel pipeline is uniformly distributed at different heights in the cold box, the high position adopts a matrix shape slightly smaller than the cross section of the cold box, the air seal pipeline arranged at the bottom layer is in a comb shape, and a support needs to be lapped at a proper position on a steel structure of the cold box. Openings are uniformly distributed on the horizontal process pipeline of each layer. Nowadays, skid-mounted cold boxes are developed in the direction of making small and compact boxes, so that the traditional sealing gas pipeline occupies part of the space of a process pipeline. Therefore, the utility model discloses the invention takes place at present, utilizes current cold box steel structural framework, under the prerequisite that does not destroy the necessary intensity of steel construction, lets main frame square steel become the pipeline of carrying nitrogen gas to evenly distributed the exhaust in each layer crossbeam or bracing department.

Disclosure of Invention

The invention aims to simplify the space of the skid-mounted cold box, and utilizes steel structure components to integrate a steel structure and sealing gas, thereby providing the air tightness device which has a simpler structure, is safe and reliable, and is reasonable and efficient and is specially used for the skid-mounted cold box.

The utility model discloses a accomplish through following technical scheme: the air tightness device comprises a hollow square steel support, an upper cross beam, a middle cross beam and a lower cross beam, wherein the upper cross beam, the middle cross beam and the lower cross beam are vertically arranged, the upper cross beam, the middle cross beam and the lower cross beam are connected with the square steel support, through holes are respectively formed between the square steel support and the upper cross beam, the middle cross beam and the lower cross beam and used for gas circulation, an upper structure beam and a lower structure beam are respectively arranged on the upper side and the lower side of the joint of one side of the middle cross beam and one side of the square steel support, the upper structure beam and the lower structure beam are respectively arranged on the joint, through holes are respectively formed in the beam bodies of the upper cross beam, the middle cross beam, the upper structure beam and the lower structure beam and used for gas discharge, and the air tightness is formed between.

Preferably, the method comprises the following steps: through holes are arranged below the beam bodies of the upper cross beam, the middle cross beam, the upper structural beam and the lower structural beam, and a layer of stainless steel wire mesh is wrapped outside the through holes through stainless steel wires.

Preferably, the method comprises the following steps: the square steel support is provided with an inlet hole in the support wall at the lower cross beam, cover plates are respectively arranged at the top and the bottom of the square steel support, gas is prevented from leaking out, a closed loop is guaranteed, and a supporting seat is further arranged below the cover plate at the bottom of the square steel support.

The utility model discloses generally can use among the sled dress cold box air separation device, replace the gas tightness system that traditional pipeline laid the formula. The device can also be applied to an independent pump box or an expansion joint partition box which is simultaneously insulated by using the pearl sand, the internal pressure of the cold box is balanced, and accidents caused by too large or too small pressure of the partition box are prevented, so that the device is ensured to be safely and stably operated.

The utility model discloses an ingenious structural design has retrencied the inner structure of sled dress cold box, optimizes the installation space in the cold box, utilizes cold box body structure to develop and install in the structure of an organic whole with the gas tightness.

Drawings

Fig. 1 is a schematic view of the main structure of the present invention.

Fig. 2 is a schematic view of a seal gas discharge structure.

Fig. 3 is a schematic view of a square steel connection structure.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings: as shown in fig. 1-3, an air-tight device for skid-mounted cold boxes comprises a hollow square steel support 1 arranged vertically and an upper cross beam 2, a middle cross beam 3 and a lower cross beam 4 connected with the square steel support 1, wherein through holes 5 for gas circulation are respectively arranged between the square steel support 1 and the upper cross beam 2, the middle cross beam 3 and the lower cross beam 4, an upper structural beam 6 arranged obliquely upwards and a lower structural beam 7 arranged obliquely downwards are respectively arranged at the upper side and the lower side of the joint of one side of the middle cross beam 3 and the square steel support 1, through holes 5 for communicating the upper structural beam 6 with the lower structural beam 7 are respectively arranged at the joint, the through holes 5 are respectively arranged on the beam bodies of the upper cross beam 2, the middle cross beam 3, the upper structural beam 6 and the lower structural beam 7 for gas discharge, and the upper cross beam 2, the middle cross beam, the upper structural beam, the middle cross beam, the lower structural beam 4 and, Through-hole 5 is equipped with to the beam body below of lower structure roof beam to pass through stainless steel 9 parcel one deck stainless steel net 8 in the outside of through-hole, manhole 10 has been seted up on the support wall that square steel support 1 is located bottom end rail department, and be equipped with apron 11 in square steel support's top and bottom respectively, prevent that gas from leaking away, guarantee closed circuit, the apron 11 below of 1 bottom of square steel support still is equipped with supporting seat 12.

The specific embodiment is as follows:

the square steel is an outer frame of a cold box steel structure, a through hole with a diameter of about phi 34 is generally formed in the bottom of the square steel support 1, a sealed gas pipeline is led into the square steel support 1, and a valve, a flowmeter and other devices can be connected onto a led-in outer pipe. A pressure measuring point is generally arranged in the cold box, and the pressure of the box body is generally maintained at micro positive pressure of about 200-500 Pa. However, this pressure is difficult to control and can bulge if the pressure is too high. In order to prevent the cold box from deforming, a cold box respirator is arranged at the top of the cold box, so that gas can enter and exit conveniently, and the pressure in the cold box can be kept constant. Just like the breathing of a person, is safe.

The sealed structure square steel support 1 is connected with an upper structural beam 6, an upper structural beam 2 and a lower structural beam 7 which are used as structural beams, and the joint is sealed and welded to ensure that the structure is airtight. However, when the square steel welding position is sealed, a through hole 5 with a diameter of about phi 34 needs to be formed so as to ensure that sealing air can normally flow into the upper structural beam 6, the upper cross beam 2 and the lower structural beam 7 from the square steel bracket 1.

After the sealing gas is introduced into the structural beam 6, the upper beam 2 and the lower structural beam 7, the through holes 5 with the diameter of 8 are required to be formed at the positions of the structural beam 6, the upper beam 2 and the lower structural beam 7 at intervals of 50mm, and the hole opening direction of the through holes is generally selected from the lower part of a horizontal beam or the oblique lower part of an inclined strut (such as the gas discharge direction marked in figure 1), so that the situation that the through holes are blocked by the pearlife dumped in the cold box and the ventilation is not smooth can be avoided. The steel structure of the side of the opening is also required to be wrapped with a layer of stainless steel wire mesh 8 or glass fiber cloth, the wire mesh is bound and fixed by stainless steel wires 9, and the opening is further protected from falling into the pearlite sand.

The through hole 5 of the steel structure beam on the hot 8 and the through hole 5 of the steel structure beam on the hot 34 to ensure that the gas passes smoothly at the welding of the steel structure beam and the square steel support 1. If an open blind end is encountered, a cover plate 11 needs to be additionally welded to ensure that a closed loop is formed and the introduced sealing gas does not leak.

Claims (3)

1. The utility model provides an air tightness device for sled dress cold box, it includes the hollow square steel support of vertical arranging and connects entablature, middle cross beam, the bottom end rail of square steel support, its characterized in that be equipped with the through-hole of intercommunication respectively between square steel support and entablature, middle cross beam, the bottom end rail for gaseous circulation, be equipped with an upper structure roof beam and the lower structure roof beam of slant row of arranging in that one side junction is equipped with respectively in the upper and lower both sides of middle cross beam and square steel support wherein to set up the through-hole of intercommunication upper structure roof beam and lower structure roof beam respectively in this junction for gaseous circulation, be equipped with the through-hole on the roof beam body of entablature, middle cross beam, upper structure roof beam, lower structure roof beam respectively for gaseous discharge.

2. The air-tight device for the skid-mounted cold box as claimed in claim 1, wherein through holes are arranged below the beam bodies of the upper cross beam, the middle cross beam, the upper structural beam and the lower structural beam, and a layer of stainless steel wire mesh is wrapped outside the through holes through stainless steel wires.

3. The airtight device for the skid-mounted cold box as claimed in claim 1, wherein the square steel support has access holes on the support wall at the lower beam, and cover plates are respectively provided in the top and bottom of the square steel support to prevent gas from leaking out and ensure a closed loop, and a support seat is further provided below the cover plate at the bottom of the square steel support.

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