A multi-stage desilication and desalination device for high-temperature high-silicon oilfield produced water recycling

Abstract

The application discloses a kind of high-temperature high-silicon oilfield produced water reuse multistage desilication and salt removal device, it is related to oilfield produced water treatment technical field, and the oilfield produced water after pretreatment enters cyclone separator by input pipe, and the top outlet end of cyclone separator is interconnected with the bottom inlet end of desilication reaction mechanism, and the top outlet end of desilication reaction mechanism is interconnected with the top inlet end of membrane desalination reactor.The oilfield produced water after pretreatment enters cyclone separator inside by input pipe and is separated, and the oilfield produced water after separation flows into desilication reaction mechanism inside by first connecting pipe tangential flow and forms spiral upward water flow, and the oilfield produced water is desilicated, so that the oilfield produced water is fully mixed with the desilication reagent sprayed by annular distribution pipe, mass transfer efficiency is improved, active seed is uniformly dispersed simultaneously, it is ensured that seed, reagent and produced water are contacted in all directions, silicon slag is generated and wrapped on the outer surface of active seed, and it is ensured that desilication reaction is fully carried out.

Description

Technical Field

[0001] This invention relates to the field of oilfield produced water treatment technology, and in particular to a multi-stage desilication and desalination device for the reuse of high-temperature, high-silicon oilfield produced water. Background Technology

[0002] As oilfield development enters its mid-to-late stages, the volume of produced water increases year by year, and the water quality becomes increasingly complex. Especially under high-temperature, high-silica conditions (typical temperature >70℃, SiO2 concentration >80mg / L, salinity >5000mg / L), traditional treatment processes suffer from severe scaling and low reuse rates, seriously affecting the stability of the water injection system and the service life of equipment. The reuse of produced water from high-temperature, high-silica oilfields is a crucial link in oilfield water conservation, emission reduction, and resource recycling. This water is characterized by high temperature, high silica content, and complex composition; desiliconization and desalination are the core treatment processes for achieving effective reuse of produced water.

[0003] Existing treatment technologies generally suffer from problems such as incomplete pretreatment of produced water from high-temperature, high-silica oilfields, uneven mixing of desiliconizing agents with water, seed crystals easily becoming encapsulated by silica slag and losing their activity during long-term use, and the inability of the abrasion structure to adaptively adjust the abrasion intensity according to the seed crystal state. These issues lead to unstable desiliconization effects, large seed crystal losses, and subsequent desalination units being easily contaminated by residual silica slag, reducing treatment efficiency and even causing equipment blockages and other malfunctions. The overall process is difficult to adapt to the special treatment requirements of produced water from high-temperature, high-silica oilfields, restricting the improvement of the efficient reuse rate of produced water and failing to meet the development needs of green environmental protection and energy conservation in oilfields. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a multi-stage desilication and desalination device for the reuse of produced water from high-temperature and high-silicon oilfields, which ensures that the desilication reaction is fully carried out and extends the service life of the seed crystal cycle.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows: The produced water from the oilfield undergoes pretreatment including cooling, demulsification, and oil removal. An input pipe is installed at one inlet end of the hydrocyclone separator. The pretreated produced water enters the hydrocyclone separator through the input pipe. A discharge pipe for removing impurities is installed at the bottom outlet end of the hydrocyclone separator. The top outlet end of the hydrocyclone separator is connected to the bottom inlet end of the desiliconization reaction mechanism via a first connecting pipe. The top outlet end of the desiliconization reaction mechanism is connected to the top inlet end of the membrane desalination reactor via a second connecting pipe. A collection pipe is installed at the bottom outlet end of the membrane desalination reactor. The aforementioned silicon removal reaction mechanism comprises: a mixing cylinder connected to the first connecting pipe at the bottom of the tank; a dosing mechanism for adding silicon removal agent on the outer circumference of the mixing cylinder; a reaction cylinder connected to the mixing cylinder at the top; multiple active seed crystals added inside the reaction cylinder; silicon slag generated by the reaction of oilfield produced water, active seed crystals, and silicon removal agent in the reaction cylinder coats the outer surface of the active seed crystals; a spiral abrasion groove is provided on the inner circumference of the reaction cylinder; multiple surface abrasion components are processed on the spiral abrasion groove to abrade and renew the silicon slag on the surface of the active seed crystals; and a separation component is provided at the top of the reaction cylinder.

[0006] Furthermore, a collection hood is provided at the top of the mixing cylinder, and a support net is provided on the collection hood between the mixing cylinder and the reaction cylinder. A second annular gap is formed between the bottom of the reaction cylinder and the collection hood, through which active seed crystals enter the support net.

[0007] Furthermore, the dosing mechanism is as follows: an annular distribution pipe is provided on the outer circumference of the mixing cylinder, and multiple outlet holes that communicate with the interior of the mixing cylinder are uniformly machined along the circumferential direction on the annular distribution pipe. Dosing pipes that communicate with each other are provided on the annular distribution pipe, and desiliconizing agent is added into the dosing pipes.

[0008] Furthermore, the surface abrasion assembly comprises: a fixed cylinder on a spiral abrasion groove, a fixed column inside the fixed cylinder, an abrasion ball on the fixed column, and multiple flexible abrasion wires on the outer surface of the abrasion ball.

[0009] Furthermore, a spring is provided inside the fixed cylinder. One end of the spring is fixedly connected to the bottom of the fixed cylinder, and the other end of the spring is connected to the isolation sleeve. The isolation sleeve is slidably connected to the inside of the fixed cylinder. A flow guide is provided on the isolation sleeve, and a through hole is provided between the flow guide and the isolation sleeve. The abrasive ball penetrates through the through hole between the flow guide and the isolation sleeve.

[0010] Furthermore, the separation component is as follows: a conical cylinder is provided at the top of the reaction cylinder and communicates with it; an interception net is provided at the bottom of the conical cylinder to intercept the active crystal; and multiple separation holes are provided on the outer circumference of the conical cylinder for throwing out silicon slag on the outer surface of the active crystal.

[0011] Furthermore, a first annular gap is machined between the interception net and the top of the reaction cylinder, through which the active crystals inside the reaction cylinder enter the tank.

[0012] Furthermore, the active seed crystal is a magnesium silicate seed crystal.

[0013] Furthermore, the silicon removal agent is magnesium oxide or magnesium chloride.

[0014] The beneficial effects of the present invention are as follows: (1) In the present invention, the pretreated oilfield produced water enters the cyclone separator through the input pipe for separation. The separated oilfield produced water flows tangentially into the desiliconization reaction mechanism through the first connecting pipe to form a spiral upward water flow, which removes silicon from the oilfield produced water, so that the produced water and the desiliconization agent sprayed by the annular distribution pipe are fully mixed, improving the mass transfer efficiency. At the same time, it drives the active crystal seed to be evenly dispersed, ensuring that the crystal seed, agent and produced water are in full contact, accelerating the generation of silicon slag and wrapping it on the outer surface of the active crystal seed, ensuring that the desiliconization reaction is fully carried out.

[0015] (2) In this invention, the active seed crystals are spirally raised on the spiral abrasion grooves on the inner side wall of the reaction cylinder, so that the seed crystals wrapped with silicon slag are attached to the wall and rise. After the silicon slag is abraded and peeled off, it enters the conical cylinder with the center of the water flow and is accurately thrown out and collected through the separation hole. The desiliconization is thorough and there are no fine silicon slag residues, which effectively avoids the risk of silicon scale blockage in the subsequent membrane desalination unit. At the same time, the seed crystals that have recovered their active state pass through the first annular gap, the inside of the tank, and the second annular gap in sequence, and return to the support net of the mixing cylinder. The seed crystals are reacted, abraded, and separated, which extends the service life of the seed crystals and can ensure stable desiliconization efficiency.

[0016] (3) In this invention, the surface abrasion component adaptively adjusts the abrasion mode according to the size of the seed crystals encasing silicon slag. When the seed crystals are large, the centrifugal force is weak, the displacement of the isolation sleeve is small, and the flexible abrasion wires fully contact the silicon slag, thus enhancing the peeling effect. When the seed crystals are small, the centrifugal force is strong, the displacement of the isolation sleeve is large, reducing the contact area of ​​the abrasion balls and preventing the seed crystals from being excessively abraded, broken, or lost. At the same time, with the guidance of the flow guide, the seed crystals are ensured to make precise contact with the abrasion component, ensuring thorough peeling of the silicon slag and extending the lifespan of the seed crystals. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the multi-stage desilication and desalination device for the reuse of produced water from high-temperature and high-silicon oilfields according to the present invention.

[0018] Figure 2 This is a schematic diagram of the silicon removal reaction mechanism.

[0019] Figure 3 This is a structural diagram of the mixing cylinder, the support net, and the collection hood.

[0020] Figure 4This is a schematic diagram of the internal structure of the reaction vessel.

[0021] Figure 5 This is a schematic diagram of the conical cylinder structure.

[0022] Figure 6 This is a schematic diagram of the surface abrasion assembly.

[0023] Figure 7 yes Figure 6 A structural diagram from another angle.

[0024] Figure 8 This is an exploded view of the surface abrasion component.

[0025] Figure 9 This is a structural diagram of the fixed cylinder, spring, and abrasive ball.

[0026] Figure 10 This is a schematic diagram of the dosing mechanism.

[0027] Reference numerals: 1. Cyclone separator; 2. Input pipe; 3. First connecting pipe; 4. Desiliconization reaction mechanism; 401. Tank; 402. Mixing cylinder; 403. Reaction cylinder; 404. Interception net; 405. Conical cylinder; 406. Separation hole; 407. Supporting net; 408. Collection hood; 409. Spiral abrasion groove; 410. Fixed cylinder; 411. Flexible abrasion wire; 412. Abrasion ball; 413. Flow guide hood; 414. Fixed column; 415. Isolation sleeve; 416. Spring; 417. Through hole; 418. First annular slit; 419. Second annular slit; 5. Second connecting pipe; 6. Membrane desalination reactor; 7. Collection pipe; 8. Dosing mechanism; 801. Dosing pipe; 802. Annular distribution pipe; 803. Discharge hole; 9. Discharge pipe. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] like Figure 1 As shown, the multi-stage desilication and desalination device for the reuse of produced water from high-temperature and high-silica oilfields in this embodiment is composed of a hydrocyclone separator 1, an input pipe 2, a first connecting pipe 3, a desilication reaction mechanism 4, a second connecting pipe 5, a membrane desalination reactor 6, a collection pipe 7, a dosing mechanism 8, a dosing pipe 801, an annular distribution pipe 802, a dosing outlet 803, and a discharge pipe 9.

[0030] The produced water from the oilfield is pretreated by cooling, demulsification, and oil removal. An input pipe 2 is installed at the inlet end of one side of the hydrocyclone 1. The pretreated produced water from the oilfield enters the hydrocyclone 1 through the input pipe 2. An outlet pipe 9 for discharging impurities is installed at the bottom outlet end of the hydrocyclone 1. The top outlet end of the hydrocyclone 1 is connected to the bottom inlet end of the desiliconization reaction mechanism 4 through the first connecting pipe 3. The top outlet end of the desiliconization reaction mechanism 4 is connected to the top inlet end of the membrane desalination reactor 6 through the second connecting pipe 5. A collection pipe 7 is installed at the bottom outlet end of the membrane desalination reactor 6. The membrane desalination reactor 6 adopts existing technology and uses a special reverse osmosis (RO) membrane reactor, nanofiltration (NF) membrane reactor, or ceramic membrane reactor to retain sodium ions.

[0031] like Figures 2 to 5 As shown, the silicon removal reaction mechanism 4 is composed of a tank 401, a mixing cylinder 402, a reaction cylinder 403, a separation component, a support net 407, a collection cover 408, a spiral abrasion groove 409, a surface abrasion component, a first annular slit 418, and a second annular slit 419 connected together.

[0032] The silicon removal reaction mechanism 4 consists of: a mixing cylinder 402 connected to the first connecting pipe 3 at the bottom of the tank 401; a collection hood 408 at the top of the mixing cylinder 402; a support net 407 located between the mixing cylinder 402 and the reaction cylinder 403 on the collection hood 408; and a second annular gap 419 formed between the bottom of the reaction cylinder 403 and the collection hood 408, through which active seed crystals enter the support net 407. A dosing mechanism 8 for adding silicon removal agent is located on the outer circumference of the mixing cylinder 402. The silicon removal agent is magnesium oxide or magnesium chloride. A reaction cylinder 403 connected to the top of the mixing cylinder 402 is located therein. Multiple active seed crystals, which are magnesium silicate seed crystals, are added inside the reaction cylinder 403. The silicon slag generated by the reaction of oilfield produced water, active seed crystals and desiliconizing agent in the reaction cylinder 403 is wrapped around the outer surface of the active seed crystals. A spiral abrasion groove 409 is provided on the inner circumference of the reaction cylinder 403. Multiple surface abrasion components are processed on the spiral abrasion groove 409 to abrade and renew the silicon slag on the surface of the active seed crystals. A separation component is provided on the top of the reaction cylinder 403.

[0033] like Figure 5 As shown, the separation assembly consists of an interception net 404, a conical cylinder 405, and a separation hole 406 connected together.

[0034] The separation assembly consists of a conical cylinder 405 connected to the top of the reaction cylinder 403, an intercepting mesh 404 at the bottom of the conical cylinder 405 to intercept the active crystals, and multiple separation holes 406 on the outer circumference of the conical cylinder 405 for ejecting silicon slag from the outer surface of the active crystals. A first annular gap 418 is machined between the intercepting mesh 404 and the top of the reaction cylinder 403, through which the active crystals inside the reaction cylinder 403 enter the interior of the tank 401.

[0035] like Figures 6 to 9 As shown, the surface abrasion assembly is composed of a fixed cylinder 410, a flexible abrasion wire 411, an abrasion ball 412, a flow guide 413, a fixed column 414, an isolation sleeve 415, a spring 416, and a through hole 417.

[0036] The surface abrasion assembly consists of: a fixed cylinder 410 mounted on a spiral abrasion groove 409; a fixed column 414 inside the fixed cylinder 410; an abrasion ball 412 mounted on the fixed column 414; and multiple flexible abrasion wires 411 on the outer surface of the abrasion ball 412. A spring 416 is installed inside the fixed cylinder 410; one end of the spring 416 is fixedly connected to the bottom of the fixed cylinder 410, and the other end is connected to an isolation sleeve 415. The isolation sleeve 415 is slidably connected to the inside of the fixed cylinder 410. A flow guide 413 is mounted on the isolation sleeve 415, and a through hole 417 is provided between the flow guide 413 and the isolation sleeve 415. The abrasion ball 412 penetrates the through hole 417 between the flow guide 413 and the isolation sleeve 415.

[0037] like Figure 10 As shown, the dosing mechanism 8 is composed of a dosing pipe 801, an annular distribution pipe 802, and a dosing outlet 803 connected together.

[0038] The dosing mechanism 8 is as follows: an annular distribution pipe 802 is provided on the outer circumference of the mixing cylinder 402. The annular distribution pipe 802 is uniformly machined with multiple outlet holes 803 that communicate with the interior of the mixing cylinder 402 along the circumferential direction. A dosing pipe 801 is provided on the annular distribution pipe 802 that communicates with it. A desiliconizing agent is added into the dosing pipe 801.

[0039] The working principle of this embodiment is as follows: (1) Pretreatment of produced water from high-temperature and high-silicon oilfields:

[0040] Cooling: Hastelloy C276 plate heat exchanger is used for cooling.

[0041] Demulsification and oil removal: Add nonionic polyether demulsifier.

[0042] (2) Desiliconization: The pretreated oilfield produced water enters the hydrocyclone 1 through the input pipe 2 for separation. The separated impurities flow out through the discharge pipe 9. The separated oilfield produced water flows tangentially into the desiliconization reaction mechanism 4 through the first connecting pipe 3 to form a spiral upward water flow, which removes silicon from the oilfield produced water.

[0043] The silicon removal process inside the silicon removal reaction mechanism 4 is as follows: Oilfield produced water forms a spiral upward flow into the mixing cylinder 402. The silicon removal agent, either magnesium oxide or magnesium chloride, enters the annular distribution pipe 802 through the dosing pipe 801. The silicon removal agent enters the reaction cylinder 403 through multiple circumferentially distributed outlet holes 803 of the annular distribution pipe 802. The silicon removal agent inside the reaction cylinder 403 mixes thoroughly with the oilfield produced water and is transported upwards into the reaction cylinder 403. During the upward flow of the mixed liquid inside the reaction cylinder 403, multiple magnesium silicate seed crystals are carried upwards and dispersed. During the mixing and reaction process of the oilfield produced water, magnesium chloride silicon removal agent, and magnesium silicate seed crystals, the generated silicon slag... The magnesium silicate seed crystals, coated on their outer surface, increase in size. Under the centrifugal force generated by the swirling flow, they spiral upwards on the spiral abrasion grooves 409 on the inner wall of the reaction cylinder 403. The magnesium silicate seed crystals come into contact with the surface abrasion components on the spiral abrasion grooves 409, abrading and renewing the surface of the magnesium silicate seed crystals, restoring them to an active state. The silica slag on the outer surface of the magnesium silicate seed crystals continues to rise in the central area of ​​the water flow and enters the conical cylinder 405. The silica slag is thrown out through multiple separation holes 406 on the conical cylinder 405. The magnesium silicate seed crystals, now in an active state, pass sequentially through the first annular gap 418, the inside of the tank 401, and the second annular gap 419, returning to the support net 407 of the mixing cylinder 402.

[0044] The working principle of the magnesium silicate seed crystals, which are formed during the reaction of oilfield produced water, magnesium chloride desiliconizing agent, and magnesium silicate seed crystals, is as follows: The magnesium silicate seed crystals act as crystallization nuclei, inducing dissolved silicate ions in the water to preferentially nucleate, grow, and precipitate on their surface. This allows dissolved silicon ions to grow directly and directionally on the seed crystal surface, forming larger and denser precipitate particles, thus removing silicon efficiently and with low reagent consumption. By adding magnesium chloride desiliconizing agent, silicate ions combine with magnesium ions to form insoluble magnesium silicate precipitates. The magnesium silicate seed crystals can efficiently capture these precipitates and guide their directional growth, achieving efficient silicon removal.

[0045] Therefore, when oilfield produced water, magnesium chloride, and magnesium silicate seed crystals are mixed, the magnesium silicate seed crystals provide directional adsorption sites for silicate ions, allowing magnesium silicate slag to preferentially form on its surface and be coated layer by layer, eventually forming large-diameter composite particles that settle and achieve silicon removal. Throughout the process, the seed crystals act as a "carrier" rather than a reaction substrate. This is why the seed crystal method for silicon removal has advantages over direct addition of magnesium salts for silicon removal, including better settling properties, higher silicon removal efficiency, and lower reagent consumption.

[0046] In this process, the magnesium silicate seed crystal contacts the surface abrasion components on the spiral abrasion groove 409. The method for abrading and renewing the surface of the magnesium silicate seed crystal is as follows: Since the magnesium silicate seed crystal is spirally ascending on the spiral abrasion groove 409 attached to the inner wall of the reaction cylinder 403, if the magnesium silicate seed crystal coated with silicon slag is large, the rotation speed of the magnesium silicate seed crystal coated with silicon slag decreases, the centrifugal force weakens, and under the elastic force of the spring 416, the isolation sleeve 415 is pushed to move inward within the fixed cylinder 410 with a small displacement. The abrasion ball 412 and the flexible abrasion wire 411 penetrate through the through hole 417 on the guide shroud 413 and the isolation sleeve 415. Under the guidance of the guide shroud 413, the silicon slag on the outer surface of the magnesium silicate seed crystal fully contacts the multiple flexible abrasion wires 411 on the abrasion ball 412 to abrade the magnesium silicate seed crystal, thus better abrading the silicon slag on the outer surface of the magnesium silicate seed crystal. If the magnesium silicate seed crystals coated with silicon slag are small, the rotational speed of the magnesium silicate seed crystals coated with silicon slag increases, the centrifugal force is strengthened, and under the elastic force of the spring 416, the isolation sleeve 415 is pushed to move inward in the fixed cylinder 410 with a large displacement. The abrasive ball 412 penetrates the through hole 417 on the guide shroud 413 and the isolation sleeve 415, and the exposed area of ​​the abrasive ball 412 is large. Under the guidance of the guide shroud 413, the seed crystal contacts the abrasive ball 412 for abrasion, avoiding the phenomenon of excessive abrasion of the seed crystal.

[0047] (3) Desalination: The oilfield produced water after desiliconization treatment enters the membrane desalination reactor 6 through the second connecting pipe 5. The membrane desalination reactor 6 desalinates the oilfield produced water, and the desalinated oilfield produced water is discharged through the collection pipe 7.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A multi-stage desilication and desalination device for the reuse of produced water from high-temperature, high-silica oilfields, characterized in that: The produced water from the oilfield is pretreated by cooling, demulsification and oil removal. An input pipe (2) is provided at the inlet end of one side of the hydrocyclone (1). The pretreated produced water from the oilfield enters the hydrocyclone (1) through the input pipe (2). A discharge pipe (9) for discharging impurities is provided at the bottom outlet end of the hydrocyclone (1). The top outlet end of the hydrocyclone (1) is connected to the bottom inlet end of the desiliconization reaction mechanism (4) through the first connecting pipe (3). The top outlet end of the desiliconization reaction mechanism (4) is connected to the top inlet end of the membrane desalination reactor (6) through the second connecting pipe (5). A collection pipe (7) is provided at the bottom outlet end of the membrane desalination reactor (6). The silicon removal reaction mechanism (4) is as follows: a mixing cylinder (402) connected to the first connecting pipe (3) is provided at the bottom of the tank (401), a dosing mechanism (8) for adding silicon removal agent is provided on the outer circumference of the mixing cylinder (402), a reaction cylinder (403) connected to the mixing cylinder (402) is provided at the top of the mixing cylinder (402), multiple active crystal seeds are added inside the reaction cylinder (403), and silicon slag generated by the reaction of oilfield produced water, active crystal seeds and silicon removal agent in the reaction cylinder (403) is wrapped on the outer surface of the active crystal seeds, a spiral abrasion groove (409) is provided on the inner circumference of the reaction cylinder (403), multiple surface abrasion components for abrading and renewing the silicon slag on the surface of the active crystal seeds are processed on the spiral abrasion groove (409), and a separation component is provided at the top of the reaction cylinder (403). The surface abrasion assembly is as follows: a fixed cylinder (410) is provided on the spiral abrasion groove (409), a fixed column (414) is provided inside the fixed cylinder (410), an abrasion ball (412) is provided on the fixed column (414), and a plurality of flexible abrasion wires (411) are provided on the outer surface of the abrasion ball (412). The fixed cylinder (410) is provided with a spring (416) inside. One end of the spring (416) is fixedly connected to the bottom of the fixed cylinder (410), and the other end of the spring (416) is connected to the isolation sleeve (415). The isolation sleeve (415) is slidably connected to the inside of the fixed cylinder (410). A flow guide (413) is provided on the isolation sleeve (415). A through hole (417) is provided between the flow guide (413) and the isolation sleeve (415). The abrasive ball (412) penetrates the through hole (417) of the flow guide (413) and the isolation sleeve (415).

2. The multi-stage desilication and desalination device for high-temperature, high-silica oilfield produced water reuse according to claim 1, characterized in that: The mixing cylinder (402) is provided with a collection cover (408) at the top, and a support net (407) is provided on the collection cover (408) between the mixing cylinder (402) and the reaction cylinder (403). Active seed crystals are formed between the bottom of the reaction cylinder (403) and the collection cover (408) and enter the second annular gap (419) on the support net (407).

3. The multi-stage desilication and desalination device for high-temperature, high-silica oilfield produced water reuse according to claim 1, characterized in that, The dosing mechanism (8) is as follows: an annular distribution pipe (802) is provided on the outer circumference of the mixing cylinder (402), and the annular distribution pipe (802) is uniformly machined with multiple outlet holes (803) that communicate with the interior of the mixing cylinder (402) along the circumferential direction. A dosing pipe (801) is provided on the annular distribution pipe (802) and communicates with it. A desiliconizing agent is added into the dosing pipe (801).

4. The multi-stage desilication and desalination device for high-temperature, high-silica oilfield produced water reuse according to claim 1, characterized in that, The separation component is as follows: a conical cylinder (405) is provided at the top of the reaction cylinder (403) and is connected to it; a blocking net (404) is provided at the bottom of the conical cylinder (405) to intercept the active crystal; and a plurality of separation holes (406) are provided on the outer circumference of the conical cylinder (405) for throwing out the silicon slag on the outer surface of the active crystal.

5. The multi-stage desilication and desalination device for high-temperature, high-silica oilfield produced water reuse according to claim 4, characterized in that: A first annular gap (418) is machined between the interception net (404) and the top of the reaction cylinder (403), and the active crystals inside the reaction cylinder (403) enter the tank (401) through the first annular gap (418).

6. The multi-stage desilication and desalination device for high-temperature, high-silica oilfield produced water reuse according to claim 1, characterized in that: The active seed crystal is a magnesium silicate seed crystal.

7. The multi-stage desilication and desalination device for the reuse of produced water from high-temperature, high-silica oilfields according to claim 1 or 3, characterized in that: The silicon removal agent is magnesium oxide or magnesium chloride.

Images