阅读说明：本技术 防开裂的盐化工设备管道 (Anti-cracking salt chemical equipment pipeline ) 是由 刘静 于 2019-12-04 设计创作，主要内容包括：本发明公开了一种防开裂的盐化工设备管道,包括盐化工设备管道,所述盐化工设备管道的管道外侧壁上沿着管道的长度方向依次套置有多个紧箍,所述紧箍为两对称半圆弧形结构,所述紧箍的一侧通过铰链连接,另一侧通过螺栓固定,所述紧箍对盐化工设备管道设有指向轴线的径向预压力,所述径向预压力等于或大于盐化工设备管道内的卤水压力。从上述结构可知,本发明的防开裂的盐化工设备管道,通过对盐化工设备管道施加径向预压力,抵消了盐化工设备管道内卤水对于盐化工设备管道的压力,即使盐化工设备管道的管内在卤水的长期作用下产生了点蚀,也不会使得点蚀部位在卤水的压应力下开裂,大大延长了盐化工设备管道的使用寿命。(The invention discloses an anti-cracking salt chemical equipment pipeline which comprises a salt chemical equipment pipeline, wherein a plurality of tightening hoops are sequentially sleeved on the outer side wall of the salt chemical equipment pipeline along the length direction of the pipeline, the tightening hoops are of two symmetrical semi-circular arc structures, one sides of the tightening hoops are connected through hinges, the other sides of the tightening hoops are fixed through bolts, the tightening hoops are provided with radial pre-pressure pointing to an axis line for the salt chemical equipment pipeline, and the radial pre-pressure is equal to or greater than the brine pressure in the salt chemical equipment pipeline. According to the anti-cracking salt chemical equipment pipeline, the radial pre-pressure is applied to the salt chemical equipment pipeline, so that the pressure of brine in the salt chemical equipment pipeline on the salt chemical equipment pipeline is offset, even if pitting corrosion is generated in the pipe of the salt chemical equipment pipeline under the long-term action of the brine, the pitting corrosion part can not crack under the pressure stress of the brine, and the service life of the salt chemical equipment pipeline is greatly prolonged.)

1. Prevent salt chemical industry equipment pipeline of fracture, including salt chemical industry equipment pipeline (1), its characterized in that: an oil pressure pipeline (3 ') is sleeved on the outer side of the salt chemical equipment pipeline (1), the oil pressure pipeline (3') and the salt chemical equipment pipeline (1) are coaxially arranged, a one-way oil inlet valve (13) is arranged on the side wall of the oil pressure pipeline (3 '), hydraulic oil (12) is arranged between the oil pressure pipeline (3') and the salt chemical equipment pipeline (1), and the pressure of the hydraulic oil (12) is equal to or greater than the pressure of brine (2) in the salt chemical equipment pipeline (1); an oil pipe A (15) and a brine pipe A (14) are respectively arranged on the side wall of the oil pressure pipeline (3 '), one end of the oil pipe A (15) penetrates through the side wall of the oil pressure pipeline (3 ') to be communicated with hydraulic oil (12) in the oil pressure pipeline (3 '), and the other end of the oil pipe A (15) is communicated with one end in a piston cylinder (16); one end of the brine pipe A (14) penetrates through the side wall of the oil pressure pipeline (3') and the side wall of the salt chemical equipment pipeline (1) respectively and is communicated with brine (2) in the salt chemical equipment pipeline (1), the other end of the brine pipe A (14) is communicated with the other end in the piston cylinder (16), a sliding block (17) matched with the piston cylinder (16) is movably connected in the piston cylinder (16), and the oil pipe A (15) and the brine pipe A (14) are communicated with two sides of the sliding block (17) respectively.

2. Prevent salt chemical industry equipment pipeline that ftractures, including salt chemical industry equipment pipeline (1), its characterized in that is just: an oil pressure pipeline (3 ') is sleeved on the outer side of the salt chemical equipment pipeline (1), the oil pressure pipeline (3') and the salt chemical equipment pipeline (1) are coaxially arranged, hydraulic oil (12) is arranged between the oil pressure pipeline (3 ') and the salt chemical equipment pipeline (1), an oil inlet pipe (13') and a brine pipe B (14 ') are respectively arranged on the side wall of the oil pressure pipeline (3'), one end of the oil inlet pipe (13 ') penetrates through the side wall of the oil pressure pipeline (3') to be communicated with the hydraulic oil (12) in the oil pressure pipeline (3 '), and the other end of the oil inlet pipe (13') is communicated with the liquid outlet end of the hydraulic pump (18) through an oil pipe C (26); one end of the brine pipe B (14 ') penetrates through the side wall of the oil pressure pipeline (3 ') and the side wall of the salt chemical equipment pipeline (1) respectively and is communicated with brine (2) in the salt chemical equipment pipeline (1), the other end of the brine pipe B (14 ') is communicated with a brine pressure gauge (23) and a pressure sensor (24) respectively, and the pressure of the hydraulic oil (12) is equal to or greater than the pressure of the brine (2) in the salt chemical equipment pipeline (1); the oil pipe C (26) is communicated with a pressure reducing valve (20), and the oil pipe C (26) is positioned between the pressure reducing valve (20) and the hydraulic pump (18) and is communicated with a normally open overflow valve (19) in parallel through an oil pipe B (25); the oil pipe C (26) is positioned between the reducing valve (20) and the liquid inlet pipe (13') and is communicated with an overflow valve (21) in parallel through an oil pipe D (27); the hydraulic pump (18) is a constant pressure variable hydraulic pump.

3. The anti-cracking salt chemical plant pipeline as claimed in claim 2, characterized in that: and an oil pressure gauge (22) is connected in parallel and communicated between the oil inlet pipe (13') and the oil pipe D (27) of the oil pipe C (26).

4. The anti-cracking salt chemical plant pipeline as claimed in claim 3, characterized in that: the rated pressure of the hydraulic pump (18) is greater than the set pressure of the normally open overflow valve (19), the set pressure of the normally open overflow valve (19) is greater than the set pressure of the overflow valve (21), and the set pressure of the overflow valve (21) is greater than the set pressure of the reducing valve (20).

Technical Field

The invention relates to the field of salt chemical equipment pipelines, in particular to an anti-cracking salt chemical equipment pipeline.

Background

The corrosion and cracking of the equipment are a great problem in the production of salt chemical enterprises. The salinization equipment has various corrosion cracking problems, which are related to the extremely severe working environment, and mainly include the following aspects:

(1) concentration of chloride ion

The chloride ion concentration in the brine is extremely high, which is the root cause of corrosion of stainless steel, and common environmental failure modes of stainless steel components, such as pitting corrosion, intergranular corrosion, crevice corrosion, stress corrosion cracking and corrosion fatigue fracture, are related to the existence of chloride ions in the solution.

Research has shown that even in a service environment with low chloride ion concentration, the influence on corrosion of stainless steel is not negligible, so that a stainless steel component directly contacted with brine is in an extremely severe working environment, and the influence of chloride ions becomes a key of analysis problems.

(2) Operating temperature

Distillation is the main process for preparing salt from brine, and the temperature of brine is slightly different in each section, about 90-120 ℃. The electrolyte in high-temperature brine and the activity of various elements in the stainless steel contacted with the electrolyte are enhanced, and the corrosion of the stainless steel is promoted. The austenitic stainless steel is likely to suffer stress corrosion cracking in the range of 50 to 300 ℃, and generally, the higher the temperature, the more likely stress corrosion cracking will occur. Stainless steel in contact with brine is well within this sensitive temperature range and therefore is susceptible to stress corrosion.

(3) Brine pressure

The brine pressure is about 0.5MPa generally, so that materials of related components such as a pump valve, a pipeline, a distillation still and the like bear a considerable stress effect. It is clear that cracking of a material is fundamentally caused by stress, and in an environment without a corrosive medium, the stress limit of the cracking of the material is higher than that in a corrosive environment.

At present, the problem of component cracking of salt chemical enterprises is usually considered firstly, and the materials are considered to have insufficient pitting corrosion resistance and intercrystalline corrosion resistance, so that the grade of stainless steel is higher and higher, and even titanium alloy materials are used under the condition that the problems cannot be solved. Even so, the early cracking of the salt chemical engineering component cannot be effectively prevented. Because the medicines are not taken according to the symptoms, the problems cannot be solved fundamentally, and the production cost of enterprises is increased. For this reason, in addition to measures for improving the corrosion resistance of the material, measures should be taken for reducing the stress.

Stainless steel has excellent mechanical properties and corrosion resistance, and has been widely used in various corrosive environments, such as chemical, oil refining, aviation, shipbuilding, and pharmaceutical industries. When the oxidizability in the environment is strong enough, the surface of the steel can not only generate a compact passive film, but also the passive film can be repaired in time once being damaged, so that the metal under the passive film can not be corroded any more, and therefore, the stainless steel has better atmospheric corrosion resistance. However, under certain conditions, especially in an environment containing chloride ions, the formed passivation film is unstable and easily broken, so that severe local corrosion, such as pitting corrosion and crevice corrosion, occurs.

Numerous studies have shown that pitting corrosion occurs at temperatures where the concentration of chloride ions exceeds the critical concentration for pitting corrosion. TSUTSUMI et al have studied that 304 stainless steel has a critical pitting concentration of about 6 mol/L at 25 c, and the chloride ion concentration in brine is far above this critical concentration, so that stainless steel in contact with brine will inevitably suffer pitting. At present, no data is available to indicate the critical concentration of pitting corrosion of 316 series stainless steel, but we can still predict that the chloride ion concentration of brine will exceed the critical concentration, so for salination equipment, replacing 304 series stainless steel with 316 series stainless steel still cannot prevent pitting corrosion because 316 stainless steel can generate pitting corrosion even if chloride ion is in the concentration range of tens of ppm at a certain temperature and an induction period.

The strongly adsorbing aggressive chloride ions will displace oxygen in the passivation film and once the chloride ions adsorb on the metal surface, the metal ion-atom bonds will be weakened, resulting in the rupture of the passivation film. In addition, chloride ions adsorbed on the metal surface and metal ions form a compound which is dissolved in electrolyte, so that the local oxidation film is thinned, more metal ions in the film migrate to the interface between the film and the electrolyte, and the metal dissolution speed is increased.

The bottom of the pitting pit generates metal dissolution reaction, and chlorine ions are gathered into the pitting pit due to the increase of the concentration of cations in the pit because the area near the pit absorbs oxygen. The chloride ions combine with the metal cations to form metal chlorides, which hydrolyze to form acids that result in lower PH in the pit, thereby resulting in autocatalytic dissolution of the metal. The result of autocatalytic dissolution enables the pitting to continuously grow and expand to form an ellipsoidal pit. Research shows that pitting pits are possible positions for crack initiation, but the pitting corrosion does not correspond to the crack initiation one by one, and cracks can be initiated only by pitting pits with larger depth or depth-diameter ratio. In the case of stainless steel, a crack source is formed when stress concentration due to pitting corrosion reaches a certain value.

Once the crack is formed, the crack propagates until the workpiece is broken. Thus, the service life of the stainless steel member is actually made up of two basic periods of time, namely, the crack initiation time and the crack propagation time, and the delay of the crack initiation or propagation speed is beneficial to improving the service life of the stainless steel member.

Stainless steel cracks are commonly found in two types, stress corrosion cracking and corrosion fatigue cracking, respectively.

(1) Stress corrosion cracking

The phenomenon of brittle fracture of stainless steel below the ultimate strength under the simultaneous action of a specific corrosive medium and tensile stress is known as stress corrosion. The stress corrosion occurs by the crack source in the corrosion sensitive micro-area, once the crack is initiated, a narrow active channel exists in the stainless steel, the passive film at the front section of the active channel is repeatedly and intermittently cracked under the action of the tensile stress, and the corrosion advances along the channel vertical to the tensile stress. At the crack tip, hydrogen is released by the anion corrosion, and a part of the hydrogen diffuses into the metal of the tip, thereby causing metal embrittlement of the tip, and finally causing brittle cracking of the stainless steel.

Stress corrosion cracks are initiated on the surface of the member, mostly in the form of pitting corrosion, and also formed by grain boundary corrosion. After pitting or crystal boundary cracks are initiated, the cracks are immediately propagated to form intergranular stress corrosion cracks, and when the cracks are propagated to a sufficient depth, the stress intensity factor is increased, so that the intergranular stress corrosion cracks are converted into transcrystalline propagation from the previous intergranular stress corrosion cracks.

(2) Corrosion fatigue

The early cracking phenomenon of a material under the combined action of alternating stress (also called periodic stress or cyclic stress) and a corrosion medium is called corrosion fatigue. The fatigue occurring in a corrosive medium is much more severe than the mechanical fatigue occurring in pure air, and in the case of stainless steel, the corrosion fatigue strength is only 50% of the mechanical fatigue strength, i.e., the damage ratio is 0.5, in an environment in which salt water is used as a corrosive medium.

Corrosion fatigue is a damage accumulation process consisting of three stages of crack initiation, propagation and fracture. The crack initiation is the same as stress corrosion, mainly occurs in pitting pits and grain boundary corrosion, and literature research shows that the grain boundary corrosion also exists at the bottom of the pitting pits in a medium with high chloride ion concentration.

Fatigue striations in fractures are a typical feature of fatigue crack propagation. Each striation corresponds to one fatigue cycle, the striation spacing corresponds to the crack propagation distance of the cycle, the higher the chloride ion concentration is, the faster the corrosion of the crack tip is, and the larger the distance that the crack advances forward is, i.e., the striation spacing.

Earlier researches show that the mechanical property of the stainless steel material in a corrosive environment is far lower than that in a non-corrosive environment, and the fundamental reason is that the stainless steel in the corrosive environment is subjected to the double actions of machinery and chemistry, and the double actions accelerate the initiation and the propagation of cracks.

In terms of crack initiation, the current measures mainly focus on the improvement of material composition and heat treatment, such as reducing the contents of Si, P and S in the stainless steel to prevent intergranular corrosion, and increasing the contents of Mo, Ni and Ti in the stainless steel to enhance the pitting corrosion resistance, and the continuous upgrading of the stainless steel used by the salination factory is in line with the above viewpoints. However, the contribution of chemical action and mechanical action is completely different in the crack initiation stage, which is mainly controlled by chemical action, and Wu Yin Shun et al, Beijing university of science and technology, clearly suggest that the dynamic stress of stainless steel in chloride solution promotes the generation and development process of pitting corrosion, which is still mainly controlled by the corrosive action of environmental media. Therefore, crack initiation is inevitable under the condition that environmental corrosion factors cannot be changed, and the method for delaying crack initiation cannot obviously improve the fatigue life of the component.

The crack propagation stage is mainly controlled by mechanical action, and only under the action of tensile stress or alternating stress can the crack tip be plastically deformed, so that fresh metal is exposed, and this part of metal can make the crack propagate under the action of corrosion, on the contrary, if the crack tip can not be opened, the crack can not be propagated. It is clear that the propagation of the crack is carried out under tensile stress (including the alternating stress in the upper part of the time axis) and that the compressive stress (including the alternating stress in the lower part of the time axis) does not cause the propagation of the crack. The member is preset with enough compressive stress, which can offset the tensile stress caused by medium pressure and the tensile stress part of alternating stress, so that the material is only under the action of the compressive stress, which is beneficial to inhibiting the crack from expanding.

Material cracking involves two basic processes, crack initiation and crack propagation, respectively. Thus, the service life of the stainless steel member is actually made up of two basic periods of time, namely, the crack initiation time and the crack propagation time, and the delay of the crack initiation or propagation speed is beneficial to improving the service life of the stainless steel member. The stainless steel is upgraded from 304L to 316L, and stainless steel with better pitting corrosion resistance and intergranular corrosion resistance is adopted, so that the service life of the stainless steel component is prolonged by delaying crack initiation, and the stainless steel component is not helpful for preventing crack propagation. Therefore, the project group considers that the stainless steel member should be prevented from early cracking and also devised to delay crack propagation.

In a corrosive environment, the mechanical property of the stainless steel material is far lower than that of a non-corrosive environment, and the basic reason is that the stainless steel in the corrosive environment is subjected to the double actions of machinery and chemistry, and the double actions accelerate the initiation and the propagation of cracks. However, in the crack initiation stage, the contribution components of the chemical action and the mechanical action are completely different, the stage is mainly controlled by the chemical action, the crack initiation is inevitable under the condition that the environmental corrosion factor cannot be changed, and the method for delaying the crack initiation cannot obviously improve the service life of the component.

The crack propagation stage is mainly controlled by mechanical action, and only under the action of tensile stress or alternating stress can the crack tip be plastically deformed, so that fresh metal is exposed, and this part of metal can make the crack propagate under the action of corrosion, on the contrary, if the crack tip can not be opened, the crack can not be propagated. Therefore, the crack propagation is performed by the tensile stress (including the alternating stress in the upper part of the time axis), and the compressive stress (including the alternating stress in the lower part of the time axis) does not cause the crack propagation. The stainless steel component is preset with enough compressive stress, which can offset the tensile stress caused by medium pressure and the tensile stress part of alternating stress, so that the material is only under the action of the compressive stress, and the expansion of cracks is favorably inhibited.

Disclosure of Invention

The invention aims to: the anti-cracking salt chemical equipment pipeline overcomes the defects of the prior art, and the anti-cracking salt chemical equipment pipeline has the advantages that the tight hoops are arranged on the surface of the salt chemical equipment pipeline, so that the tight hoops apply radial pre-pressure to the salt chemical equipment pipeline, the pressure of brine in the salt chemical equipment pipeline on the salt chemical equipment pipeline is offset, even if the pitting corrosion is generated in the pipe of the salt chemical equipment pipeline under the long-term action of the brine, the pressure of the brine in the salt chemical equipment pipeline is offset by the action of the radial pre-pressure of the tight hoops on the salt chemical equipment pipeline, the pitting corrosion part can not crack under the pressure stress of the brine, and the service life of the salt chemical equipment pipeline is greatly prolonged; the pre-pressure of the tight hoops on the salt chemical pipeline is uniformly distributed under the action of the cushion layer; the strength of the tightening hoop is improved through the action of the ribs, and the maximum pre-pressure value of the tightening hoop on the salt chemical pipeline is increased; through the function of the slotted hole, the self weight of the tightening band is reduced, and meanwhile, the cost of the tightening band is also reduced; the pre-pressure applied by the tight hoops to the salt chemical equipment pipeline is more uniform through the angle difference between the adjacent tight hoops; the pressure of the hydraulic oil on the salt chemical equipment pipeline counteracts the brine pressure in the salt chemical equipment pipeline, so that the pitting corrosion part cannot crack under the pressure stress of the brine, and the service life of the salt chemical equipment pipeline is greatly prolonged; the pressure of the hydraulic oil on the salt chemical equipment pipeline is more uniform than that of the tight hoop; the piston cylinder inner slide block can bear the pressure fluctuation of brine in a salt chemical equipment pipeline within a certain range, so that the application range of the invention is improved; through the initiative fuel feeding of hydraulic pump, not only can bear the pressure oscillation of brine certain range in the salt chemical industry equipment pipeline, even brine in the salt chemical industry equipment pipeline leads to the pressure range to change because of reasons such as production moreover, also the pressure of hydraulic oil also can initiatively change through the effect of hydraulic pump, not only can bear the pressure oscillation of small circle, but also can be suitable for the brine of the required different pressures of different production technology.

The technical scheme adopted by the invention is as follows:

prevent salt chemical industry equipment pipeline that ftractures, including salt chemical industry equipment pipeline, a plurality of lock hoops have been put along the length direction of pipeline to overlap in proper order on the pipeline lateral wall of salt chemical industry equipment pipeline, the lock hoop is two symmetrical half-circular arc structures, hinged joint is passed through to one side of lock hoop, and the opposite side passes through the bolt fastening, the lock hoop is equipped with the radial precompression of directional axis to salt chemical industry equipment pipeline, radial precompression equals or is greater than the brine pressure in the salt chemical industry equipment pipeline.

The invention has the further improvement scheme that a cushion layer is arranged on one side of the tight hoop, which is in contact with the pipeline of the salt chemical equipment.

According to a further improved scheme of the invention, a plurality of ribs are arranged on the outer surface of the tightening hoop, and the ribs are arc-shaped and matched with the shape of the tightening hoop; and a groove hole is formed between the adjacent ribs on the tightening hoop.

According to a further improvement of the invention, the tight hoops on the salt chemical equipment pipeline and the adjacent tight hoops have an angle difference around the axis of the salt chemical equipment pipeline.

Salt chemical industry equipment pipeline of fracture, including salt chemical industry equipment pipeline, the oil pressure pipeline has been put to the pipeline outside cover of salt chemical industry equipment pipeline, oil pressure pipeline sets up with the axle center with salt chemical industry equipment pipeline, is equipped with one-way inlet valve on the lateral wall of oil pressure pipeline, is equipped with hydraulic oil between oil pressure pipeline and the salt chemical industry equipment pipeline, the pressure of hydraulic oil equals or is greater than the brine pressure in the salt chemical industry equipment pipeline.

According to a further improved scheme of the invention, an oil pipe A and a brine pipe A are respectively arranged on the side wall of the oil pressure pipeline, one end of the oil pipe A penetrates through the side wall of the oil pressure pipeline to be communicated with hydraulic oil in the oil pressure pipeline, and the other end of the oil pipe A is communicated with one end in the piston cylinder; the utility model discloses a brine pipe, including oil pressure pipeline, salt chemical industry equipment pipeline, oil pipe A, piston cylinder, oil pipe A and brine pipe A, the lateral wall of oil pressure pipeline and salt chemical industry equipment pipeline is passed respectively to brine pipe A's one end, and with the brine intercommunication in the salt chemical industry equipment pipeline, brine pipe A's the other end and the other end intercommunication in the piston cylinder, swing joint has the slider that matches with the piston cylinder in the piston cylinder, oil pipe A and brine pipe A communicate respectively in the both.

The anti-cracking salt chemical equipment pipeline comprises a salt chemical equipment pipeline, wherein an oil pressure pipeline is sleeved outside the salt chemical equipment pipeline, the oil pressure pipeline and the salt chemical equipment pipeline are coaxially arranged, hydraulic oil is arranged between the oil pressure pipeline and the salt chemical equipment pipeline, an oil inlet pipe and a brine pipe B are respectively arranged on the side wall of the oil pressure pipeline, one end of the oil inlet pipe penetrates through the side wall of the oil pressure pipeline to be communicated with the hydraulic oil in the oil pressure pipeline, and the other end of the oil inlet pipe is communicated with the liquid outlet end of a hydraulic pump through an oil pipe C; the lateral wall that oil pressure pipeline's lateral wall and salt chemical industry equipment pipeline are passed respectively to brine pipe B's one end, with the brine intercommunication in the salt chemical industry equipment pipeline, brine pipe B's the other end communicates respectively with brine manometer and pressure sensor, the pressure of hydraulic oil equals or is greater than the brine pressure in the salt chemical industry equipment pipeline.

The invention has the further improvement scheme that a pressure reducing valve is communicated with the oil pipe C, and a normally open overflow valve is communicated in parallel between the pressure reducing valve and the hydraulic pump through an oil pipe B; and the oil pipe C is positioned between the pressure reducing valve and the liquid inlet pipe and is communicated with an overflow valve in parallel through the oil pipe D.

According to a further improved scheme of the invention, an oil pressure gauge is connected and communicated in parallel between the oil inlet pipe and the oil pipe D in the oil pipe C.

The invention has the further improvement scheme that the rated pressure of the hydraulic pump is greater than the set pressure of the normally open overflow valve, the set pressure of the normally open overflow valve is greater than the set pressure of the overflow valve, and the set pressure of the overflow valve is greater than the set pressure of the pressure reducing valve.

The invention has the beneficial effects that:

first, according to the anti-cracking salt chemical equipment pipeline, the tight hoops are arranged on the surface of the salt chemical equipment pipeline, so that the tight hoops apply radial pre-pressure to the salt chemical equipment pipeline, the pressure of brine in the salt chemical equipment pipeline on the salt chemical equipment pipeline is offset, even if pitting corrosion is generated in the pipe of the salt chemical equipment pipeline under the long-term action of the brine, the pressure of the brine in the salt chemical equipment pipeline is offset due to the action of the radial pre-pressure of the tight hoops on the salt chemical equipment pipeline, the pitting corrosion part can not crack under the pressure stress of the brine, and the service life of the salt chemical equipment pipeline is greatly prolonged.

Secondly, the anti-cracking salt chemical equipment pipeline disclosed by the invention enables the pre-pressure of the tight hoop on the salt chemical pipeline to be uniformly distributed under the action of the cushion layer.

Thirdly, the anti-cracking salt chemical equipment pipeline has the advantages that the strength of the tight hoop is improved through the action of the ribs, and the maximum pre-pressure value of the tight hoop on the salt chemical equipment pipeline is increased.

Fourthly, the anti-cracking salt chemical equipment pipeline reduces the dead weight of the tightening hoop and simultaneously reduces the cost of the tightening hoop through the function of the slotted hole.

Fifthly, the anti-cracking salt chemical equipment pipeline enables pre-pressure applied by the tight hoops to the salt chemical equipment pipeline to be more uniform through the angle difference between the adjacent tight hoops.

Sixthly, according to the anti-cracking salt chemical equipment pipeline, the brine pressure in the salt chemical equipment pipeline is counteracted through the pressure of the hydraulic oil on the salt chemical equipment pipeline, so that the pitting corrosion part can not crack under the pressure stress of the brine, and the service life of the salt chemical equipment pipeline is greatly prolonged; and because the effect that the oil pressure of hydraulic oil goes on to the salt chemical industry equipment pipeline, the pressure of its effect is more even to the pressure of salt chemical industry equipment pipeline than foretell lock ring.

Seventh, the anti-cracking salt chemical equipment pipeline can bear the pressure fluctuation of brine in the salt chemical equipment pipeline within a certain range under the action of the sliding block in the piston cylinder, and the application range of the anti-cracking salt chemical equipment pipeline is widened.

Eighth, the anti-cracking salt chemical equipment pipeline disclosed by the invention can bear the pressure fluctuation of brine in the salt chemical equipment pipeline within a certain range through the active oil supply of the hydraulic pump, and even if the pressure range of the brine in the salt chemical equipment pipeline is changed due to production and other reasons, the pressure of hydraulic oil can also be actively changed through the action of the hydraulic pump, so that the anti-cracking salt chemical equipment pipeline not only can bear the pressure fluctuation within a small range, but also can be suitable for brine with different pressures required by different production processes.

Description of the drawings:

fig. 1 is a schematic front view of a structure according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional side view of the structure of the first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional side view of a second embodiment of the present invention.

FIG. 4 is a schematic cross-sectional side view of a third embodiment of the present invention.

The specific implementation mode is as follows:

first embodiment

As can be seen from fig. 1 and 2, the brine treatment device comprises a salt chemical equipment pipeline 1, a plurality of tightening hoops 3 are sequentially sleeved on the outer side wall of the salt chemical equipment pipeline 1 along the length direction of the pipeline, the tightening hoops 3 are of two symmetrical semi-circular arc structures, one sides of the tightening hoops 3 are connected through hinges 4, the other sides of the tightening hoops are fixed through bolts 6, the tightening hoops 3 set radial pre-pressure pointing to an axis to the salt chemical equipment pipeline 1, and the radial pre-pressure is equal to or greater than the pressure of brine 2 in the salt chemical equipment pipeline 1. Be equipped with the lock ring 3 through the surface at salt chemical industry equipment pipeline 1, make lock ring 3 exert radial precompression to salt chemical industry equipment pipeline 1, the pressure of brine 2 to salt chemical industry equipment pipeline 1 in the salt chemical industry equipment pipeline 1 has been offset, even salt chemical industry equipment pipeline 1's intraductal under brine 2 long-term effects produced the pitting corrosion, but because lock ring 3 has offset the pressure of brine 2 to salt chemical industry equipment pipeline 1 in the salt chemical industry equipment pipeline 1 to the effect of the radial precompression force of salt chemical industry equipment pipeline 1, make the pitting corrosion position can not ftracture under brine 2's compressive stress, the life of salt chemical industry equipment pipeline 1 has been prolonged greatly.

And a cushion layer 7 is arranged on one side of the tight hoop 3, which is in contact with the salt chemical equipment pipeline 1. The cushion layer 7 is a metal gasket, so that the pre-pressure of the tightening hoop 3 on the salt chemical pipeline 1 is uniformly distributed.

A plurality of ribs 8 are arranged on the outer surface of the tightening hoop 3, and the ribs 8 are arc-shaped and matched with the tightening hoop 3 in shape; and a groove hole 9 is formed between the adjacent ribs 8 on the tightening hoop 3. The ribs 8 improve the strength of the tightening hoop 3 and increase the maximum pre-pressure value of the tightening hoop 3 to the salt chemical pipeline 1; the slot 9 reduces the dead weight of the tightening band 3 and also reduces the cost of the tightening band 3.

The tight hoops 3 on the salt chemical equipment pipeline 1 and the adjacent other tight hoops 3 have an angle difference around the axis of the salt chemical equipment pipeline 1. Due to the angle difference between the adjacent tight hoops 3, the pre-pressure applied by the tight hoops 3 to the salt chemical equipment pipeline 1 is more uniform.

The tightening hoop 3 rotates through a pin shaft 10 of the hinge 4, the bolt 6 is fixed through a connecting plate 5 arranged on the tightening hoop 3, and the bolt 6 is a torque bolt.

Second embodiment

As shown in fig. 3, the salt chemical equipment pipeline comprises a salt chemical equipment pipeline 1, an oil pressure pipeline 3 'is sleeved on the outer side of the salt chemical equipment pipeline 1, the oil pressure pipeline 3' and the salt chemical equipment pipeline 1 are coaxially arranged, a one-way oil inlet valve 13 is arranged on the side wall of the oil pressure pipeline 3 ', and hydraulic oil 12 is arranged between the oil pressure pipeline 3' and the salt chemical equipment pipeline 1. Through putting oil pressure pipeline 3 'at salt chemical industry equipment pipeline 1 surface cover to be full of hydraulic oil 12 between oil pressure pipeline 3' and salt chemical industry equipment pipeline 1, the pressure of hydraulic oil 12 equals or is greater than 2 pressures of brine in the salt chemical industry equipment pipeline 1. The pressure of the hydraulic oil 12 on the salt chemical equipment pipeline 1 counteracts the pressure of brine 2 in the salt chemical equipment pipeline 1, so that the pitting corrosion part cannot crack under the pressure stress of the brine 2, and the service life of the salt chemical equipment pipeline 1 is greatly prolonged; and because the hydraulic pressure of the hydraulic oil 12 acts on the salt chemical equipment pipeline 1, the acting pressure is more uniform than the pressure of the tight hoop 3 in the first embodiment on the salt chemical equipment pipeline 1.

An oil pipe A15 and a brine pipe A14 are respectively arranged on the side wall of the oil pressure pipeline 3 ', one end of the oil pipe A15 penetrates through the side wall of the oil pressure pipeline 3 ' to be communicated with hydraulic oil 12 in the oil pressure pipeline 3 ', and the other end of the oil pipe A15 is communicated with one end in the piston cylinder 16; one end of the brine pipe A14 penetrates through the side wall of the oil pressure pipeline 3' and the side wall of the salt chemical equipment pipeline 1 respectively and is communicated with brine 2 in the salt chemical equipment pipeline 1, the other end of the brine pipe A14 is communicated with the other end in the piston cylinder 16, a sliding block 17 matched with the piston cylinder 16 is movably connected in the piston cylinder 16, and the oil pipe A15 and the brine pipe A14 are communicated with two sides of the sliding block 17 respectively. Through the effect of the slider 17 in the piston cylinder 16, can make the pressure of hydraulic oil 12 equal all the time with the pressure of brine 2, prevent that salt chemical industry equipment pipeline 1 in the pressure of brine 2 from producing undulant back, can still produce the influence to salt chemical industry equipment pipeline 1. Compared with the first embodiment, the embodiment can bear the pressure fluctuation of brine 2 in the salt chemical equipment pipeline 1 within a certain range through the action of the sliding block 17 in the piston cylinder 16, and the application range of the invention is improved.

Third embodiment

As shown in fig. 4, the hydraulic pressure pipeline 3 'is sleeved outside the pipeline of the salt chemical equipment pipeline 1, the hydraulic pressure pipeline 3' and the salt chemical equipment pipeline 1 are coaxially arranged, hydraulic oil 12 is arranged between the hydraulic pressure pipeline 3 'and the salt chemical equipment pipeline 1, an oil inlet pipe 13' and a brine pipe B14 'are respectively arranged on the side wall of the hydraulic pressure pipeline 3', one end of the oil inlet pipe 13 'penetrates through the side wall of the hydraulic pressure pipeline 3' to be communicated with the hydraulic oil 12 in the hydraulic pressure pipeline 3 ', and the other end of the oil inlet pipe 13' is communicated with the liquid outlet end of the hydraulic pump 18 through an oil pipe C26; the lateral wall that oil pressure pipeline 3 'and salt chemical industry equipment pipeline 1' are passed respectively to the one end of brine pipe B14 ', with 2 intercommunications of brine in the salt chemical industry equipment pipeline 1, the other end of brine pipe B14' communicates respectively with brine manometer 23 and pressure sensor 24, the pressure of hydraulic oil 12 equals or is greater than 2 pressures of brine in the salt chemical industry equipment pipeline 1. The pressure of the hydraulic oil 12 on the salt chemical equipment pipeline 1 counteracts the pressure of brine 2 in the salt chemical equipment pipeline 1, so that the pitting corrosion part cannot crack under the pressure stress of the brine 2, and the service life of the salt chemical equipment pipeline 1 is greatly prolonged; moreover, as the oil pressure of the hydraulic oil 12 acts on the salt chemical equipment pipeline 1, the acting pressure is more uniform than the pressure of the tight hoop 3 in the first embodiment on the salt chemical equipment pipeline 1; compare in the regulatory action of hydraulic oil 12 in the second embodiment, through the initiative fuel feeding of hydraulic pump 18, not only can bear the pressure fluctuation of 2 certain limits in brine in the salt chemical industry equipment pipeline 1, even brine 2 in the salt chemical industry equipment pipeline 1 leads to the pressure range change because of reasons such as production, also the pressure of hydraulic oil 12 also can initiatively change through hydraulic pump 18's effect, not only can bear the pressure fluctuation of the small scale in the second embodiment, but also can be suitable for the brine 2 of the required different pressures of different production technologies.

The hydraulic pump 18 is a constant pressure variable hydraulic pump. The pressure output of the hydraulic oil 12 is ensured to be constant.

The oil pipe C26 is communicated with a pressure reducing valve 20, and the oil pipe C26 is positioned between the pressure reducing valve 20 and the hydraulic pump 18 and is communicated with a normally open overflow valve 19 in parallel through an oil pipe B25; the oil pipe C26 is positioned between the pressure reducing valve 20 and the liquid inlet pipe 13' and is communicated with an overflow valve 21 in parallel through an oil pipe D27.

The pressure reducing valve 20 is a pilot proportional pressure reducing valve, the normally open overflow valve 19 is a pilot electromagnetic overflow valve, and the overflow valve 21 is a pilot proportional overflow valve.

And the oil pipe C26 is positioned between the oil inlet pipe 13' and the oil pipe D27 and is communicated with an oil pressure gauge 22 in parallel.

The rated pressure of the hydraulic pump 18 is greater than the set pressure of the normally open relief valve 19, the set pressure of the normally open relief valve 19 is greater than the set pressure of the relief valve 21, and the set pressure of the relief valve 21 is greater than the set pressure of the pressure reducing valve 20. The normal operation of the hydraulic oil 12 oil way is ensured, and the hydraulic oil 12 in the hydraulic pipeline 3' is prevented from being over-pressurized.