An oil slurry desolidification process and equipment integrating chemical sedimentation and electrostatic separation

Abstract

The invention discloses an oil slurry desolidification process and equipment integrating chemical sedimentation and electrostatic separation, belonging to the field of catalytic cracking oil slurry removal of solid catalyst. The oil slurry desolidification equipment integrating chemical sedimentation and electrostatic separation comprises a static mixer, a primary sedimentation separation component, a two-stage electrostatic separation component and a filter which are connected in sequence, wherein the primary sedimentation separation component comprises a settler, and the two-stage electrostatic separation component comprises an electrostatic separator A, an electrostatic separator B and an electrostatic separator C; the invention can realize that, by adopting a process combining primary auxiliary agent sedimentation and secondary electrostatic separation, impurities with large particle size are initially sedimented and removed before electrostatic separation, and impurities with small particle size are deeply removed by electrostatic separation, thereby improving the efficiency of oil slurry desolidification, improving the solid impurity removal rate, reducing the power load of electrostatic separation, and reducing the cleaning frequency.

Description

Technical Field

[0001] The present invention relates to the field of solid catalyst removal from catalytic cracking oil slurry, and more specifically to an oil slurry solid removal process and equipment integrating chemical precipitation and electrostatic separation. Background Art

[0002] Catalytic cracking (FCC) is the main technical means for lightening heavy oil in the oil refining industry. The output of FCC slurry oil, one of the by-products of catalytic cracking, is increasing day by day. There are two main methods for treating the slurry oil: one is full or partial refining, and the other is a throw-out device. Most of the slurry oil from the throw-out device is used as a blending component of fuel oil, but because it contains a large amount of catalyst particles, it is easy to cause wear of the furnace nozzle and ash accumulation in the furnace. The utilization rate of resource components in the slurry oil is low, resulting in a waste of resources.

[0003] The composition of catalytic cracking oil slurry in my country is roughly: 50% to 65% aromatic hydrocarbons (including about 60% heavy aromatic hydrocarbons), 25% to 40% saturated hydrocarbons, and less than 16% colloidal asphaltene content. According to its component properties, oil slurry can produce needle coke, carbon fiber materials, carbon black, rubber softener, etc. If it is utilized, oil slurry is actually a resource with great value. The premise of high-value utilization of oil slurry is to effectively remove solid impurities in the oil slurry. The solid catalyst particles in FCC oil slurry are mainly composed of aluminum silicate, with a particle size of about 0 to 80μm, of which the proportion of particles below 20μm accounts for the majority. The skeleton density of fresh catalyst in oil slurry is about 2550kg / m³, the aerated density is about 800kg / m³, and the apparent bulk density is about 750kg / m³.

[0004] There are four main methods for separating solid particles in FCC oil slurry: additive sedimentation method, filtration method, centrifugation method and electrostatic method. The advantage of additive sedimentation method is low price, but due to the limited types of additives, the sedimentation cycle is relatively long, the sedimentation equipment occupies a large area, and the sedimentation effect is poor, its application is limited. The advantages of the filtration method are stable solid removal effect and low operating cost, but the investment in the filtration device is high, and the oil slurry is prone to coking at high temperature, which affects the long-term operation of the device. The key technology of the filtration method is to select suitable filter materials and effective backwashing methods. The protection and regeneration of the filter element are not easy, and its development in China is currently stagnant. The centrifugation method is simple to operate, with small equipment investment and small footprint, but because the centrifuge is a high-speed running equipment, it is difficult to maintain and the processing capacity is not large. The electrostatic separation method has a high solid removal efficiency and is relatively easy to flush and regenerate, but the equipment investment is high, and the removal effect on different oil slurries is quite different. The electrostatic method has excellent solid removal effect for oil slurry with low solid content and fine particle size, but its solid removal ability is limited by the number of adsorption points.

[0005] The catalytic cracking oil slurry not only contains highly dispersed nano-scale solid catalyst powder, but also the presence of film-forming substances such as colloids, asphaltene, sulfur, nitrogen and metal compounds in the oil slurry, which, on the one hand, promote and stabilize the dispersion of suspended particles, and on the other hand, are conducive to the formation of a stable interface film at the oil-water interface, making it difficult to separate by natural gravity sedimentation. However, studies have found that adding certain chemical additives to produce demulsification, flocculation and sedimentation can effectively promote oil-water separation and accelerate the sedimentation of catalyst powder.

[0006] Asphaltene in oil slurry constitutes the nucleus of colloid, and colloid adsorbs on asphaltene to stabilize it. Aromatic components are good solvents, while saturated components are poor solvents. The more aromatic components there are, the more stable the system is, and the more saturated components there are, the more unstable the system is. Therefore, adding additives with similar saturated component structures to oil slurry will reduce the colloid stability of the system and cause asphaltene to precipitate, making it easier to remove. When the asphaltene in the oil slurry is partially removed, the "competitive adsorption" of asphaltene and solid particles on the electrostatic filler is reduced, thereby improving the desolidification efficiency of the oil slurry.

[0007] It can be concluded that multifunctional additives (demulsifiers, flocculants, sedimentation agents, etc.) can reduce the viscosity of the oil slurry system, reduce the resistance of solid particles during electrostatic adsorption, increase the electrostatic adsorption rate, reduce the separation time, improve the separation effect, and achieve energy saving. Additives combined with sedimentation for preliminary oil slurry purification improve the properties of oil slurry before electrostatic separation, laying a good foundation for electrostatic separation. Therefore, we propose an oil slurry desolidification process and equipment that integrates chemical sedimentation and electrostatic separation. Summary of the invention

[0008] 1. Technical issues to be solved

[0009] In view of the problems existing in the prior art, the purpose of the present invention is to provide an oil slurry desolidification process and equipment integrating chemical sedimentation and electrostatic separation, which can achieve the following: adopting a process combining primary auxiliary agent sedimentation and secondary electrostatic separation, preliminary sedimentation to remove impurities with large particle size before electrostatic separation, and deep electrostatic separation to remove impurities with small particle size, thereby improving the efficiency of oil slurry desolidification, improving the solid impurity removal rate, reducing the power load of electrostatic separation, and reducing the cleaning frequency.

[0010] Technical Solution

[0011] To solve the above problems, the present invention adopts the following technical solutions.

[0012] An oil slurry desolidification device integrating chemical sedimentation and electrostatic separation, comprising a static mixer, a first-stage sedimentation separation component, a two-stage electrostatic separation component and a filter connected in sequence;

[0013] The first-stage sedimentation separation component includes a settler, and the two-stage electrostatic separation component includes an electrostatic separator A, an electrostatic separator B and an electrostatic separator C, wherein the electrostatic separator A, the electrostatic separator B and the electrostatic separator C are connected in series.

[0014] Further, the lower part of the electrostatic separator A is connected with an oil slurry switch valve A and a cleaning valve A arranged in parallel, the lower part of the electrostatic separator B is connected with an oil slurry switch valve B and a cleaning valve B arranged in parallel, the lower part of the electrostatic separator C is connected with an oil slurry switch valve C and a cleaning valve C arranged in parallel, the upper part of the settler, the oil slurry switch valve A and the lower part of the electrostatic separator B are connected in series through a pipeline, and an oil slurry switch valve E is installed on the pipeline between the oil slurry switch valve A14 and the electrostatic separator B, the upper part of the electrostatic separator A, the oil slurry switch valve B and the lower part of the electrostatic separator C are connected in series through a pipeline, and an oil slurry switch valve F is installed on the pipeline between the oil slurry switch valve B and the electrostatic separator C, and the oil slurry switch valve C is connected with the upper part of the electrostatic separator B through a pipeline;

[0015] The cleaning valve A, cleaning valve B and cleaning valve C are all connected to the upper part of the filter, the upper part of the electrostatic separator A is connected to the cleaning valve D, the upper part of the electrostatic separator B is connected to the cleaning valve E, the upper part of the electrostatic separator C is connected to the cleaning valve F, the cleaning valve D, cleaning valve E and cleaning valve F are all connected to the middle part of the filter, and the cleaning valve D, cleaning valve E and cleaning valve F are arranged in parallel;

[0016] The upper part of the settler is connected with a bypass valve, the pipeline between the oil slurry switch valve C and the electrostatic separator B is equipped with an oil slurry switch valve G, the upper part of the electrostatic separator C is equipped with an oil slurry switch valve D, and the bypass valve, the oil slurry switch valve G and the oil slurry switch valve D are arranged in parallel, the top of the electrostatic separator A is connected with a transformer A, the top of the electrostatic separator B is connected with a transformer B, and the top of the electrostatic separator C is connected with a transformer C;

[0017] The electrostatic separator A is equipped with an explosion-proof low liquid level switch A, the electrostatic separator B is equipped with an explosion-proof low liquid level switch B, and the electrostatic separator C is equipped with an explosion-proof low liquid level switch C.

[0018] Furthermore, the explosion-proof low liquid level switch A, the explosion-proof low liquid level switch B and the explosion-proof low liquid level switch C all include a microswitch, a movable torsion bar, a bias spring, a magnet, an iron core, a sleeve, a compression spring, a steel cable and a float. The microswitch is located at the upper part, and is provided with a common end, a normally open end and a normally closed end. The sleeve is located at the lower part of the microswitch, and the movable torsion bar is located between the microswitch and the sleeve. The magnet and the bias spring are both assembled at the end of the movable torsion bar close to the sleeve. The magnet is used to drive the movable torsion bar to move toward the end close to the sleeve, and the bias spring is used to drive the movable torsion bar to move toward the end away from the sleeve. The iron core is vertically slidably connected to the inside of the sleeve, the steel cable is assembled at the lower part of the iron core, and the lower part of the steel cable extends to the lower side of the sleeve and is connected to the float. The compression spring is assembled on the outside of the steel cable and is located at the lower side of the sleeve, and is used to drive the steel cable to move downward.

[0019] Furthermore, the electrostatic separator A, electrostatic separator B and electrostatic separator C all include an electrostatic separator tank body, the top of the electrostatic separator tank body is provided with a high voltage power inlet and a discharge port, and the side wall of the electrostatic separator tank body is provided with an oil slurry feed port;

[0020] The middle part of the electrostatic separator tank is installed with a positive electrode plate and a negative electrode plate arranged alternately in sequence, the positive electrode plate and the negative electrode plate are welded on a support beam, and the support beam is connected to the electrostatic separator tank, and the middle part of the electrostatic separator tank is filled with a spherical filler;

[0021] A filler support sieve plate is provided inside the electrostatic separator tank and at the lower side of the positive electrode plate and the negative electrode plate, and a circular hole is opened on the filler support sieve plate;

[0022] The material discharging port is equipped with a material discharging collection mechanism, and the material discharging collection mechanism is arranged on the top of the electrostatic separator tank body.

[0023] Furthermore, the spherical filler is any one of glass balls and ceramic balls, the ball diameter is 1.5mm to 10mm, and the spherical filler contains any one of metal potassium oxide and metal sodium oxide, the content of which is 5% to 40%.

[0024] Furthermore, the positive electrode plate and the negative electrode plate both include a square electrode plate frame, the electrode plate frame is welded to a support beam, a number of round steels are welded to the electrode plate frame, and a reinforcement support is welded to the tail end of the round steel.

[0025] Furthermore, the support beam is divided into a positive auxiliary beam and a negative auxiliary beam. The positive auxiliary beam is connected to the electrostatic separator tank body through an insulating suspension, and the positive electrode plate is welded to the positive auxiliary beam. The negative auxiliary beam is connected to the electrostatic separator tank body through a dedicated mounting bracket, and the negative electrode plate is welded to the negative auxiliary beam.

[0026] An oil slurry desolidification process integrating chemical precipitation and electrostatic separation comprises the following steps:

[0027] S1: Primary additive sedimentation, heating the oil slurry, injecting chemical agents into the heated oil slurry, and then mixing and stirring. After the stirring is completed, it is allowed to settle to remove some impurities;

[0028] S2: Secondary electrostatic separation, the oil slurry after being freed from impurities is placed in a uniform high-voltage electric field with fillers, so that the solid impurities in the oil slurry are adsorbed on the fillers under the action of electrostatic force, thus achieving liquid-solid separation of the oil slurry.

[0029] Furthermore, the heating temperature for heating the oil slurry in S1 is 120°C to 180°C.

[0030] Furthermore, the chemical agents are demulsifiers, flocculants and modifiers. Beneficial Effects

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] This scheme adopts a process combining primary auxiliary agent sedimentation and secondary electrostatic separation. The auxiliary agent sedimentation is used to remove larger particles in the oil slurry and solid particles that are easy to settle under the action of the auxiliary agent, and serves as a pretreatment for electrostatic separation. Electrostatic separation is used to deeply desolidify the oil slurry, especially to remove solid impurities with small particle size that are difficult to remove by conventional sedimentation. The combination of the two greatly improves the efficiency of oil slurry desolidification, improves the solid impurity removal rate, reduces the power load of electrostatic separation, and reduces the cleaning frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of a process flow of oil slurry desolidification integrating chemical precipitation and electrostatic separation according to the present invention;

[0034] Among them, 1. static mixer; 2. settler; 3. electrostatic separator A; 4. electrostatic separator B; 5. electrostatic separator C; 6. filter; 7. transformer A; 8. transformer B; 9. transformer C; 10. explosion-proof low liquid level switch A; 11. explosion-proof low liquid level switch B; 12. explosion-proof low liquid level switch C; 13. bypass valve; 14. oil slurry switch valve A; 15. oil slurry switch valve B; 16. oil slurry switch valve C; 17. oil slurry switch valve D; 18. oil slurry switch valve E; 19. oil slurry switch valve F; 20. oil slurry switch valve G; 21. cleaning valve A; 22. cleaning valve B; 23. cleaning valve C; 24. cleaning valve D; 25. cleaning valve E; 26. cleaning valve F;

[0035] Figure 2 It is a structural schematic diagram of the electrostatic separator of the present invention;

[0036] Among them, 27, electrostatic separator tank; 28, positive electrode plate; 29, negative electrode plate; 30, support beam; 31, insulation suspension; 32, discharge collection mechanism; 33, high voltage power inlet; 34, filler support screen plate; 36, discharge port;

[0037] Figure 3 It is a schematic diagram of the structure of the positive and negative electrode plates of the electrostatic separator of the present invention;

[0038] Among them, 37, electrode plate frame; 38, round steel; 39, reinforcement support;

[0039] Figure 4 It is a schematic diagram of the structure of the positive and negative electrode plate support beams of the electrostatic separator of the present invention;

[0040] Among them, 35, negative auxiliary beam; 40, mounting support; 53, positive auxiliary beam;

[0041] Figure 5 The transformer wiring principle of the present invention;

[0042] Figure 6 is a transformer output characteristic diagram of the present invention;

[0043] Figure 7 This is a working principle diagram of the explosion-proof low liquid level switch of the present invention;

[0044] Among them, 41, micro switch; 42, movable torsion bar; 43, bias spring; 44, magnet; 45, iron core; 46, sleeve; 47, compression spring; 48, steel cable; 49, float; 50, common end; 51, normally open; 52, normally closed. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention. Example

[0046] See also Figure 1 As shown, an oil slurry desolidification process integrating chemical precipitation and electrostatic separation comprises the following steps:

[0047] Step 1: The primary additive is settled and the oil slurry is heated at a temperature of about 120-180°C. The specific heating temperature is determined according to the specific oil slurry components, in order to fully reduce the oil slurry viscosity and improve the oil slurry fluidity;

[0048] A certain amount of chemical agents is injected into the heated oil slurry, and then mixed and stirred. The chemical agents may be demulsifiers, flocculants and modifiers. The specific amount of chemical agents (demulsifiers, flocculants, modifiers) injected is determined by matching experiments based on the actual oil slurry properties and chemical agent properties;

[0049] The oil slurry after stirring is allowed to settle, so that the oil slurry can first remove some solid impurities with large particles that are easy to settle and separate, as well as impurities such as colloids and asphalt that affect electrostatic separation under the action of chemical agents, providing good process conditions for subsequent electrostatic separation;

[0050] Step 2: Secondary electrostatic separation, the oil slurry after being freed from impurities is placed in a high-voltage electrostatic field provided with fillers, so that the solid impurities in the oil slurry are adsorbed on the fillers under the action of electrostatic force, realizing the liquid-solid separation of the oil slurry. Example

[0051] See also Figure 1-7 As shown, an oil slurry desolidification equipment integrating chemical sedimentation and electrostatic separation includes a static mixer 1, a primary sedimentation separation component, a two-stage electrostatic separation component and a filter 6 connected in sequence;

[0052] Among them, see Figure 1 As shown, the primary sedimentation separation component includes a settler 2, which is an empty tank, that is, a vertical or horizontal metal pressure vessel, used to provide a natural sedimentation space for the oil slurry added with chemical additives, and only provides a certain residence time for the solid impurities that are easy to settle to settle first;

[0053] Please refer again to Figure 1As shown, the two-stage electrostatic separation component includes an electrostatic separator A3, an electrostatic separator B4 and an electrostatic separator C5, wherein the electrostatic separator A3, the electrostatic separator B4 and the electrostatic separator C5 are connected in series with each other, and any two of them form a two-stage electrostatic separation system, and the other electrostatic separator performs a cleaning operation. The three electrostatic separators perform a cleaning operation in turn to ensure that two electrostatic separators are in an electrostatic separation state to meet the solid content requirement of the oil slurry after degassing.

[0054] See also Figure 1-2 As shown, the electrostatic separator is provided with electrode plates and fillers, and the fillers are preferably glass beads. The top of the electrostatic separator is provided with necessary instruments such as a transformer and an explosion-proof low liquid level switch. Under the action of the transformer and the electrode plates, a high-voltage electric field is formed inside the electrostatic separator, so that the solid impurities in the oil slurry are adsorbed on the fillers under the action of electrostatic force, thereby achieving liquid-solid separation of the oil slurry;

[0055] The specific principle is: during the electrostatic treatment process, the glass beads generate bound charges in the electric field, which are superimposed on each other and concentrated at the contact points between the fillers, forming an electrostatic field and electric field gradient with the same direction as the original electric field. Due to the action of electrostatic force, solid particles will adsorb to the filler glass beads. When a certain time has passed and the adsorption reaches equilibrium, the adsorption will no longer continue.

[0056] Among them, the static mixer 1 is used to mix the oil slurry and various additives. The mixer itself has no mechanical moving parts. It relies on the mixing unit with a special internal structure to cause the fluid to produce cutting, rotation and other effects inside the equipment, so that the immiscible fluids are dispersed and mixed with each other to achieve a good mixing effect.

[0057] The oil slurry comes from outside the world. Since the oil slurry has high viscosity and poor fluidity under normal temperature conditions, it needs to be heated before entering the sedimentation system. According to the specific components of the oil slurry, the appropriate heating temperature is determined, which is roughly between 120 and 180°C. In order to fully reduce the viscosity of the oil slurry and make the oil slurry more fluid, a certain amount of demulsifier, flocculant, and modifier is injected into the oil slurry heated to the operating temperature. The specific amount of chemical agent injection is determined by matching the actual properties of the oil slurry and the properties of the chemical agents. After being fully mixed in the static mixer 1, the oil slurry enters the sedimentation system. The purpose of the oil slurry settling in the settler 2 is to remove some solid impurities with large particles and easy to settle and separate, as well as impurities such as colloids and asphalt that affect electrostatic separation under the action of chemical agents, so as to provide good process conditions for subsequent electrostatic separation. Generally, the oil slurry enters the settler 2 from the middle of the settler 2, and the oil slurry with preliminary impurities removed leaves the settler 2 from the top of the settler 2. The waste residue is discharged from the bottom of the settler 2 to the storage tank or other treatment facilities, and the oil slurry leaving the settler 2 enters the electrostatic separation system;

[0058] The purpose of pre-chemical sedimentation is to remove most of the solid impurities that are easy to settle, which can reduce the operating current of the electrostatic separator and reduce the cleaning frequency.

[0059] Among them, see Figure 1 As shown, the lower part of the electrostatic separator A3 is connected with an oil slurry switch valve A14 and a cleaning valve A21 arranged in parallel, the lower part of the electrostatic separator B4 is connected with an oil slurry switch valve B15 and a cleaning valve B22 arranged in parallel, the lower part of the electrostatic separator C5 is connected with an oil slurry switch valve C16 and a cleaning valve C23 arranged in parallel, the upper part of the settler 2, the oil slurry switch valve A14 and the lower part of the electrostatic separator B4 are connected in series through a pipeline, and an oil slurry switch valve E18 is installed on the pipeline between the oil slurry switch valve A14 and the electrostatic separator B4, the upper part of the electrostatic separator A3, the oil slurry switch valve B15 and the lower part of the electrostatic separator C5 are connected in series through a pipeline, and an oil slurry switch valve F19 is installed on the pipeline between the oil slurry switch valve B15 and the electrostatic separator C5, and the oil slurry switch valve C16 and the upper part of the electrostatic separator B4 are connected through a pipeline;

[0060] The cleaning valve A21, cleaning valve B22 and cleaning valve C23 are all connected to the upper part of the filter 6, the upper part of the electrostatic separator A3 is connected to the cleaning valve D24, the upper part of the electrostatic separator B4 is connected to the cleaning valve E25, the upper part of the electrostatic separator C5 is connected to the cleaning valve F26, the cleaning valve D24, the cleaning valve E25 and the cleaning valve F26 are all connected to the middle part of the filter 6, and the cleaning valve D24, the cleaning valve E25 and the cleaning valve F26 are arranged in parallel;

[0061] According to the attached Figure 1When the electrostatic separator A3 and the electrostatic separator B4 are in the electrostatic separation state and the electrostatic separator C5 is in the cleaning state, the oil slurry switch valve A14 is opened, the oil slurry switch valve B15 is opened, the oil slurry switch valve C16 is closed, the oil slurry switch valve D17 is closed, the oil slurry switch valve E18 is closed, the oil slurry switch valve F19 is closed, the oil slurry switch valve G20 is opened, the cleaning valve A21 is closed, the cleaning valve B22 is closed, the cleaning valve C23 is opened, the cleaning valve D24 is closed, the cleaning valve E25 is closed, and the cleaning valve F26 is opened. The oil slurry from the settler 2 passes through the electrostatic separator A3 and the electrostatic separator B4 in turn for electrostatic separation. The oil slurry enters the electrostatic separator from the bottom of the electrostatic separator and leaves from the top of the electrostatic separator. The oil slurry that has been electrostatically separated goes to the subsequent treatment process. Process, cleaning oil (toluene, etc.) and inorganic acid (nitric acid, phosphoric acid) are injected into the electrostatic separator C5 after being pressurized by the cleaning oil pump to flush the filler in the electrostatic separator C5. The purpose of flushing is to dissolve the solid impurities adsorbed on the filler in the cleaning oil or discharge them out of the tank in a solid state with the cleaning oil, so as to clean the filler and facilitate the next round of electrostatic adsorption separation. The cleaning oil enters the electrostatic separator from the bottom of the electrostatic separator and leaves from the top of the electrostatic separator. The cleaning oil dissolved or carrying solid impurities leaves the electrostatic separator C5 and goes to the filter 6. The filter 6 contains a filter medium for filtering the solid impurities contained in the cleaning oil to realize the recovery of the cleaning oil. After being filtered by the filter 6, the cleaning oil goes to the outlet of the cleaning oil pump for reuse and the cleaning operation is carried out again.

[0062] According to the attached Figure 1When the electrostatic separator A3 and the electrostatic separator C5 are in the electrostatic separation state and the electrostatic separator B4 is in the cleaning state, the oil slurry switch valve A14 is opened, the oil slurry switch valve B15 is closed, the oil slurry switch valve C16 is closed, the oil slurry switch valve D17 is opened, the oil slurry switch valve E18 is closed, the oil slurry switch valve F19 is opened, the oil slurry switch valve G20 is closed, the cleaning valve A21 is closed, the cleaning valve B22 is opened, the cleaning valve C23 is closed, the cleaning valve D24 is closed, the cleaning valve E25 is opened, and the cleaning valve F26 is closed. The oil slurry from the settler 2 is electrostatically separated by the electrostatic separator A3 and the electrostatic separator C5 in turn. The oil slurry enters the electrostatic separator from the bottom of the electrostatic separator and leaves from the top of the electrostatic separator. The oil slurry after electrostatic separation goes to the subsequent treatment process. Cleaning oil (toluene, etc.) and inorganic acid (nitric acid, phosphoric acid) come from outside the tank, are pressurized by the cleaning oil pump and injected into the electrostatic separator B4 to flush the filler in the electrostatic separator B4. The purpose of flushing is to dissolve the solid impurities adsorbed on the filler in the cleaning oil or discharge them out of the tank in a solid state with the cleaning oil, so as to clean the filler and facilitate the next round of electrostatic adsorption and separation. The cleaning oil enters the electrostatic separator from the bottom of the electrostatic separator and leaves from the top of the electrostatic separator. The cleaning oil dissolved or carrying solid impurities leaves the electrostatic separator C5 and goes to the filter 6. The filter 6 contains a filter medium for filtering the solid impurities contained in the cleaning oil to realize the recovery of the cleaning oil. After being filtered by the filter 6, the cleaning oil goes to the outlet of the cleaning oil pump for reuse and the cleaning operation is carried out again.

[0063] According to the attached Figure 1When the electrostatic separator A3 and the electrostatic separator C5 are in the electrostatic separation state and the electrostatic separator B4 is in the cleaning state, the oil slurry switch valve A14 is opened, the oil slurry switch valve B15 is closed, the oil slurry switch valve C16 is closed, the oil slurry switch valve D17 is opened, the oil slurry switch valve E18 is closed, the oil slurry switch valve F19 is opened, the oil slurry switch valve G20 is closed, the cleaning valve A21 is closed, the cleaning valve B22 is opened, the cleaning valve C23 is closed, the cleaning valve D24 is closed, the cleaning valve E25 is opened, and the cleaning valve F26 is closed. The oil slurry from the settler 2 is electrostatically separated by the electrostatic separator A3 and the electrostatic separator C5 in turn. The oil slurry enters the electrostatic separator from the bottom of the electrostatic separator and leaves from the top of the electrostatic separator. The oil slurry after electrostatic separation goes to the subsequent treatment process. Cleaning oil (toluene, etc.) and inorganic acid (nitric acid, phosphoric acid) come from outside the tank, are pressurized by the cleaning oil pump and injected into the electrostatic separator B4 to flush the filler in the electrostatic separator B4. The purpose of flushing is to dissolve the solid impurities adsorbed on the filler in the cleaning oil or discharge them out of the tank in a solid state with the cleaning oil, so as to clean the filler and facilitate the next round of electrostatic adsorption and separation. The cleaning oil enters the electrostatic separator from the bottom of the electrostatic separator and leaves from the top of the electrostatic separator. The cleaning oil dissolved or carrying solid impurities leaves the electrostatic separator C5 and goes to the filter 6. The filter 6 contains a filter medium for filtering the solid impurities contained in the cleaning oil to realize the recovery of the cleaning oil. After being filtered by the filter 6, the cleaning oil goes to the outlet of the cleaning oil pump for reuse and the cleaning operation is carried out again.

[0064] According to the attached Figure 1When electrostatic separators B4 and C5 are in electrostatic separation state and electrostatic separator A3 is in cleaning state, oil slurry switch valve A14 is closed, oil slurry switch valve B15 is closed, oil slurry switch valve C16 is opened, oil slurry switch valve D17 is opened, oil slurry switch valve E18 is opened, oil slurry switch valve F19 is closed, oil slurry switch valve G20 is closed, cleaning valve A21 is opened, cleaning valve B22 is closed, cleaning valve C23 is closed, cleaning valve D24 is opened, cleaning valve E25 is closed, and cleaning valve F26 is closed. The oil slurry from settler 2 is electrostatically separated by electrostatic separators B4 and C5 in turn. The oil slurry enters the electrostatic separator from the bottom of the electrostatic separator and leaves from the top of the electrostatic separator. The oil slurry after electrostatic separation goes to the subsequent treatment process. Cleaning oil (toluene, etc.) and inorganic acid (nitric acid, phosphoric acid) are injected into the electrostatic separator A3 after being pressurized by the cleaning oil pump to flush the filler in the electrostatic separator A3. The purpose of flushing is to dissolve the solid impurities adsorbed on the filler in the cleaning oil or discharge them out of the tank in a solid state with the cleaning oil, so as to clean the filler and facilitate the next round of electrostatic adsorption separation. The cleaning oil enters the electrostatic separator from the bottom of the electrostatic separator and leaves from the top of the electrostatic separator. The cleaning oil dissolved or carrying solid impurities leaves the electrostatic separator C5 and goes to the filter 6. The filter 6 contains a filter medium for filtering the solid impurities contained in the cleaning oil to realize the recovery of the cleaning oil. After being filtered by the filter 6, the cleaning oil goes to the outlet of the cleaning oil pump for reuse and the cleaning operation is carried out again.

[0065] Among them, see Figure 1 As shown, the upper part of the settler 2 is connected with a bypass valve 13, the pipeline between the oil slurry switch valve C16 and the electrostatic separator B4 is equipped with an oil slurry switch valve G20, the upper part of the electrostatic separator C5 is equipped with an oil slurry switch valve D17, and the bypass valve 13, the oil slurry switch valve G20 and the oil slurry switch valve D17 are arranged in parallel. When the electrostatic separator fails or other emergency special conditions occur, the oil slurry can enter the subsequent treatment facilities directly through the bypass valve 13 after the settler 2, bypassing the electrostatic separator, and the bypass valve 13 is open at this time.

[0066] Among them, see Figure 1 As shown, the top of the electrostatic separator A3 is connected to a transformer A7, the top of the electrostatic separator B4 is connected to a transformer B8, and the top of the electrostatic separator C5 is connected to a transformer C9;

[0067] Here we introduce the transformer on the top of the electrostatic separator. The wiring principle of the transformer is as follows: Figure 5 As shown, the output characteristics of the transformer are as follows Figure 6As shown, in order to prevent the increase of current in the electrostatic separator from causing short circuit tripping, interrupting production, and possibly causing equipment damage, in order to achieve the purpose of safe and continuous operation, a 100% high-impedance transformer voltage regulation scheme is adopted. The transformer outputs direct current. The commonly used electric field strength of electrostatic separation equipment is about 1200V / cm, and the commonly used voltage adjustment range is 14-25kV. The standard output DC voltage of this equipment is divided into five levels of 14-18-22-26-30kV. A graded voltage regulating switch is provided on the high-voltage side of the transformer. Manual voltage regulation without load is simple and convenient to operate. The power supply voltage is AC 380V;

[0068] Among them, see Figure 1 As shown, the electrostatic separator A3 is equipped with an explosion-proof low liquid level switch A10, the electrostatic separator B4 is equipped with an explosion-proof low liquid level switch B11, and the electrostatic separator C5 is equipped with an explosion-proof low liquid level switch C12;

[0069] For details, please refer to Figure 1 and Figure 7 As shown, the explosion-proof low liquid level switch A10, the explosion-proof low liquid level switch B11 and the explosion-proof low liquid level switch C12 are all float level switches, which are used for the electrostatic separator when it is started, stopped or fails. There is a possibility of explosive mixed gas in the tank. The electrical interlock is used to ensure that the transformer cannot be sent to a point to avoid an explosion accident caused by electric sparks. They all include a micro switch 41, a movable torsion bar 42, a bias spring 43, a magnetic steel 44, an iron core 45, a sleeve 46, a compression spring 47, a steel cable 48 and a float 49. The micro switch 41 is located at the upper part, and a common terminal 50, a normally open terminal 51 and a normally closed terminal 52 are arranged on it. The sleeve 46 is located at the lower part of the micro switch 41. The movable torsion bar 42 is located between the micro switch 41 and the sleeve 46. The magnet 44 and the bias spring 43 are both mounted on the end of the movable torsion bar 42 close to the sleeve 46. The magnet 44 is used to drive the movable torsion bar 42 to move toward the end close to the sleeve 46. The bias spring 43 is used to drive the movable torsion bar 42 to move toward the end away from the sleeve 46. The iron core 45 is vertically slidably connected to the inside of the sleeve 46. The steel cable 48 is mounted on the lower part of the iron core 45, and the lower part of the steel cable 48 extends to the lower side of the sleeve 46 and is connected to the float 49. The compression spring 47 is mounted on the outer side of the steel cable 48 and is located on the lower side of the sleeve 46, and is used to drive the steel cable 48 to move downward.

[0070] Regarding the explosion-proof low liquid level switch, its working principle is as follows Figure 7As shown, the float 49 of the explosion-proof low liquid level switch is suspended on the liquid surface by a steel cable 48. When the liquid level rises, the buoyancy of the float 49 is changed, so that the float 49 is displaced upward due to the force change, resulting in the iron core 45 connected thereto acting on the magnetic steel 44 to adsorb the movable torsion bar 42, so that the movable torsion bar 42 rotates and fits the micro switch 41, and the micro switch 41 is actuated. The change of liquid level must be converted into the change of buoyancy by the float 49 to push the micro switch 41 to actuate. The change of the float 49 is caused only when the liquid level changes in the area where the float 49 is located. The buoyancy in the area between the two floats 49 is almost unchanged. Therefore, a large switching difference can be obtained by adjusting the distance between the two floats 49.

[0071] This process and technical solution is equipped with a fully automatic control system with programming function. The signals of all the above instruments and automatic valves (bypass valve 13, feed valve, cleaning valve, pressure, temperature, flow and other signals) are all integrated into the control system, and the relevant process operations and valve closing / opening are carried out according to the control logic and switching sequence set by the program (technical solution).

[0072] Among them, the transformer, which is composed of a single-phase transformer, a reactor, a rectifier, etc., is used to provide power to the electrode components in the electrostatic separator. The transformer is an internal series reactor structure with an impedance matching of 100%. The transformer core 45 and the reactor core 45 are assembled as one body and fixed to the oil tank with bolts. The rectifier and the transformer are installed in one body and fixed to the oil tank with bolts on the top. The transformer and the rectifier are connected inside the box, the power supply lead-in line, and the measurement line are led out with a sleeve 46 and installed in the safety box on the side of the oil tank. The cable is introduced from the bottom of the box and sealed with a sealing ring. The high voltage is a lateral lead-out structure, which can be plugged and connected with the high voltage cable connector, or fixedly connected. Its protective cylinder is filled with transformer oil, and the oil circuit is isolated from the box.

[0073] The transformer can be a DC transformer, an AC transformer, a pulse transformer, or any other power source that can output high voltage.

[0074] The control cabinet is equipped with a DC voltmeter and an ammeter for measuring the DC output of the transformer. It is also equipped with protective electrical appliances and operating switches, as well as short-circuit sound and light alarm devices. Each control cabinet can control three electric refining transformers. The control cabinet also has a programmable control system for collecting all temperature, pressure, flow and other signals in the entire oil slurry desolidification system, controlling the opening / closing of all switch valves and automatic valves, and performing related process operations according to process requirements and preset control programs.

[0075] Among them, various types of additives include demulsifiers, flocculants and modifiers. Demulsifiers are oil-soluble demulsifiers, which have higher interfacial activity than emulsified film-forming substances in oil slurry. They can adsorb or partially replace the natural emulsifier adsorbed on the interfacial film, and form a mixed film with the film-forming substance that is lower than the original interfacial film strength, resulting in weakening and thinning of the interfacial film, thereby destroying the interfacial film. Flocculants are organic polymer flocculants (alkylphenol formaldehyde resin, aliphatic quaternary ammonium salt, polyacrylamide, etc.), which form hydrogen bonds or ion pairs with particles through their own polarity or ionic groups, and adsorb on the surface of particles through van der Waals force, or a combination of these forces, and bridge between particles to form flocculent precipitation, thereby settling and separating the flocculated solid particles from the oil slurry. Modifiers are used to increase the relative dielectric constant of solid particles in the oil slurry, so that they are easily polarized into dipoles under high-voltage electric fields, so that they are "adsorbed" on the surface of the filler and removed. The basic requirements for modifiers are: high polarity, easy to adsorb on the surface of solid particles; relative dielectric constant greater than the relative dielectric constant of solid particles; good solubility with oil slurry.

[0076] The cleaning agent includes solvents and inorganic acids. The solvent is an organic chemical solvent such as toluene that can easily dissolve solid slag. The inorganic acid is a solution of phosphoric acid, nitric acid, etc.

[0077] The following is attached to the instruction manual Figure 2 The technical solution of the electrostatic separator of the present invention is further described in detail.

[0078] Among them, according to the attached Figure 2 As shown, the electrostatic separator A3, the electrostatic separator B4 and the electrostatic separator C5 are all vertical pressure vessels for solid-liquid separation of solid impurities in the oil slurry, and include an electrostatic separator tank body 27, on which necessary process pipe openings are provided according to process requirements, such as a high-voltage power inlet 33 and a discharge port 36 provided at the top head of the electrostatic separator tank body 27, and an oil slurry feed port can be provided at the bottom head or side wall of the electrostatic separator tank body 27 according to actual needs;

[0079] The middle part of the electrostatic separator tank 27 is installed with positive electrode plates 28 and negative electrode plates 29 arranged alternately in sequence, wherein the electrostatic separator tank 27 is equivalent to a layer of negative electrode plates 29, and the positive electrode plates 28 and negative electrode plates 29 are both welded to the support beam 30, and the support beam 30 is connected to the electrostatic separator tank 27.

[0080] Here, the electrode plate is a suspended variable-pitch electrode plate. By changing the electrode distance, a suitable DC weak electric field, DC medium electric field and DC strong electric field can be obtained. By changing the height of each section of the electrode plate, a suitable electric field residence time can be obtained under a constant material rising speed.

[0081] The height of the positive electrode plate 28 and the negative electrode plate 29 accounts for about one-third of the height of the entire electrostatic separator, that is, the electrode plate area. Spherical fillers are filled in the electrode plate area. The spherical fillers are glass balls or ceramic balls with a ball diameter of 1.5mm to 10mm. The basic requirements are high sphericity, good deformation resistance, smooth surface and high dielectric constant to fill the entire electrode plate area.

[0082] A filler support sieve plate 34 is provided inside the electrostatic separator tank 27 and at the lower side of the positive electrode plate 28 and the negative electrode plate 29. The filler support sieve plate 34 is provided with circular holes with a hole diameter of about 1 mm (the specific circular hole opening size is based on not being larger than the filler ball diameter). The filler support sieve plate 34 is used to support the filler bed layer.

[0083] In order to prevent the spherical fillers from being lost at the discharge port 36 along with the cleaning oil during the cleaning operation, the discharge port 36 is equipped with a discharge collection mechanism 32 for blocking the spherical fillers. The discharge collection mechanism 32 is arranged on the top of the electrostatic separator tank 27 and is matched with the discharge port 36, and the oil slurry separated from the solids is led out therefrom. The discharge collection pipe adopts an axial porous pipe. The hole speed and hole diameter are selected to meet the oil slurry processing volume requirements and will not cause the electrostatic separator fillers to be lost. The principle is to evenly lead out the oil slurry from each radial part.

[0084] Regarding spherical fillers, the adsorption of microparticles by fillers in an electrostatic field is based on the difference in dielectric constants between the liquid phase, microparticles and fillers. Electrostatic adsorption can only occur when the dielectric constants of the fillers and microparticles are greater than the dielectric constant of the liquid phase. This requires that the dielectric constant of the filler must be greater than that of the liquid phase. Under a high-voltage electric field, the microparticles (dipoles) induce charges of equal magnitude and opposite directions. The bound charges of the filler are concentrated near the contact points of the filler, increasing the electric field strength and electric field gradient around them. The particles are attracted to the contact points, forming "point adsorption". Since the surface finish has a great influence on the geometric shape of the filler contact points, the sharper the wedge formed at the contact point of the two filler particles, the greater the local electric field gradient formed by the bound charges, thereby increasing the dielectrophoretic force on the catalyst particles and being more conducive to adsorption. Therefore, electrostatic adsorption is required. The higher the surface smoothness of the separation filler, the better. In addition, since the current that affects the separation is the current passing through the filler rather than the current passing through the liquid phase, it is the ions rather than the electrons that conduct electricity in the glass bead filler. Therefore, the electrostatic separation filler must contain 5%-40% of conductive components such as metal potassium oxide or metal sodium oxide. Regarding the stacking of fillers, the separation efficiency decreases according to the stacking methods of cubic stacking, hexagonal closest stacking, body-centered cubic stacking and ordinary cubic stacking. This is mainly due to the differences in the porosity in the device, the non-uniform coefficient of the electric field and the number of effective contact points caused by different stacking methods of fillers.

[0085] The following is attached to the instruction manual Figure 3-4The technical solution of the structure of the positive and negative electrode plates 29 of the electrostatic separator of the present invention is further described in detail;

[0086] The difference between the positive electrode plate 28 and the negative electrode plate 29 is whether they are charged. The charged one is called the positive electrode plate 28, and the uncharged one is called the negative electrode plate 29. The positive and negative electrode plates 29 have the same structure. Figure 3-4 As shown, the positive electrode plate 28 and the negative electrode plate 29 both include a square electrode plate frame 37, the electrode plate frame 37 is welded to the support beam 30, a number of round steels 38 are welded to the electrode plate frame 37, and a reinforcing support 39 is welded to the tail end of the round steel 38. The function of the electrode plate frame 37 is to provide the lateral dimension and basic frame of the electrode plate, the function of the round steel 38 is to expand the size of the electrode plate and provide a wider electric field area, and the function of the reinforcing support 39 is to prevent the round steel 38 from deforming in shape, and can also improve the electric field strength at the tail end to a certain extent.

[0087] The electrode plates are installed inside the electrostatic separator tank 27, with positive and negative electrodes alternately arranged from the head end to the tail end of the electrostatic separator tank, perpendicular to the diameter of the electrostatic separator tank, and suspended in the electrostatic separator tank 27. Due to the alternating voltage on the positive and negative plates, an alternating electric field is formed between the end plate at the lower end of the electrode plate and the oil-water interface. This alternating electric field is designed to be an alternating weak electric field. Above the alternating weak electric field are a DC weak electric field, a DC medium electric field, and a DC strong electric field. The positive and negative plates are made of metal materials, and the positive and negative plates in the DC strong electric field area are a mesh structure, which is conducive to achieving a uniform electric field.

[0088] The following is attached to the instruction manual Figure 4 , the technical solution of the electrostatic separator support beam 30 structure of the present invention is further described in detail:

[0089] According to the attached Figure 4 As shown, the support beam 30 is divided into a positive auxiliary beam 53 and a negative auxiliary beam 35. The positive auxiliary beam 53 is connected to the electrostatic separator tank 27 through an insulating hanger 31 (made of polytetrafluoroethylene, non-conductive). The positive electrode plate 28 is welded to the positive auxiliary beam 53. The negative auxiliary beam 35 is connected to the electrostatic separator tank 27 through a dedicated mounting bracket 40. The negative electrode plate 29 is welded to the negative auxiliary beam 35. The positive auxiliary beam 53 and the negative auxiliary beam 35 do not contact each other. The high voltage electricity from the transformer is introduced into the electrostatic separator through the high voltage electricity inlet 33, and the high voltage electricity is introduced into the positive auxiliary beam 53, so that the positive electrode plate 28 is charged, and a high voltage electric field is generated between the charged positive electrode plate 28 and the uncharged negative electrode plate 29.

[0090] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oil slurry desolidification equipment integrating chemical precipitation and electrostatic separation, characterized in that: It comprises a static mixer (1), a first-stage sedimentation separation component, a two-stage electrostatic separation component and a filter (6) which are connected in sequence; The first-stage sedimentation separation component comprises a sedimentator (2), and the two-stage electrostatic separation component comprises an electrostatic separator A (3), an electrostatic separator B (4) and an electrostatic separator C (5), wherein the electrostatic separator A (3), the electrostatic separator B (4) and the electrostatic separator C (5) are connected in series with each other; The lower part of the electrostatic separator A (3) is connected to an oil slurry switch valve A (14) and a cleaning valve A (21) arranged in parallel, the lower part of the electrostatic separator B (4) is connected to an oil slurry switch valve B (15) and a cleaning valve B (22) arranged in parallel, the lower part of the electrostatic separator C (5) is connected to an oil slurry switch valve C (16) and a cleaning valve C (23) arranged in parallel, and the upper part of the settler (2), the oil slurry switch valve A (14) and the lower part of the electrostatic separator B (4) are connected through a pipeline. The electrostatic separators A (3) and C (5) are connected in series, and an oil slurry switch valve E (18) is installed on the pipeline between the oil slurry switch valve A (14) and the electrostatic separator B (4); the upper part of the electrostatic separator A (3), the oil slurry switch valve B (15) and the lower part of the electrostatic separator C (5) are connected in series through a pipeline, and an oil slurry switch valve F (19) is installed on the pipeline between the oil slurry switch valve B (15) and the electrostatic separator C (5); the oil slurry switch valve C (16) and the upper part of the electrostatic separator B (4) are connected through a pipeline; The cleaning valve A (21), the cleaning valve B (22) and the cleaning valve C (23) are all connected to the upper part of the filter (6); the upper part of the electrostatic separator A (3) is connected to the cleaning valve D (24); the upper part of the electrostatic separator B (4) is connected to the cleaning valve E (25); the upper part of the electrostatic separator C (5) is connected to the cleaning valve F (26); the cleaning valve D (24), the cleaning valve E (25) and the cleaning valve F (26) are all connected to the middle part of the filter (6); and the cleaning valve D (24), the cleaning valve E (25) and the cleaning valve F (26) are arranged in parallel; The upper part of the settler (2) is connected to a bypass valve (13); the pipeline between the oil slurry switch valve C (16) and the electrostatic separator B (4) is equipped with an oil slurry switch valve G (20); the upper part of the electrostatic separator C (5) is equipped with an oil slurry switch valve D (17); the bypass valve (13), the oil slurry switch valve G (20) and the oil slurry switch valve D (17) are arranged in parallel; the top of the electrostatic separator A (3) is connected to a transformer A (7); the top of the electrostatic separator B (4) is connected to a transformer B (8); and the top of the electrostatic separator C (5) is connected to a transformer C (9); The electrostatic separator A (3) is equipped with an explosion-proof low liquid level switch A (10), the electrostatic separator B (4) is equipped with an explosion-proof low liquid level switch B (11), and the electrostatic separator C (5) is equipped with an explosion-proof low liquid level switch C (12); The explosion-proof low liquid level switch A (10), the explosion-proof low liquid level switch B (11) and the explosion-proof low liquid level switch C (12) all include a micro switch (41), a movable torsion bar (42), a bias spring (43), a magnetic steel (44), an iron core (45), a sleeve (46), a compression spring (47), a steel cable (48) and a float (49). The micro switch (41) is located at the upper part and is provided with a common end (50), a normally open (51) and a normally closed (52). The sleeve (46) is located at the lower part of the micro switch (41). The movable torsion bar (42) is located between the micro switch (41) and the sleeve (46). The magnetic steel (44) and the bias spring (43) are both assembled at the upper part. The movable torsion bar (42) is close to one end of the sleeve (46), the magnetic steel (44) is used to drive the movable torsion bar (42) to move toward the end close to the sleeve (46), the bias spring (43) is used to drive the movable torsion bar (42) to move toward the end away from the sleeve (46), the iron core (45) is vertically slidably connected to the inside of the sleeve (46), the steel cable (48) is installed at the lower part of the iron core (45), and the lower part of the steel cable (48) extends to the lower side of the sleeve (46) and is connected to the float (49), the compression spring (47) is installed on the outside of the steel cable (48) and is located on the lower side of the sleeve (46), and is used to drive the steel cable (48) to move downward; The electrostatic separator A (3), the electrostatic separator B (4) and the electrostatic separator C (5) all include an electrostatic separator tank body (27), the top of the electrostatic separator tank body (27) is provided with a high voltage power inlet (33) and a discharge port (36), and the side wall of the electrostatic separator tank body (27) is provided with an oil slurry feed port; A positive electrode plate (28) and a negative electrode plate (29) arranged alternately in sequence are installed in the middle of the electrostatic separator tank (27); the positive electrode plate (28) and the negative electrode plate (29) are welded to a support beam (30), and the support beam (30) is connected to the electrostatic separator tank (27); and a spherical filler is filled in the middle of the electrostatic separator tank (27); A filler support sieve plate (34) is provided inside the electrostatic separator tank (27) and below the positive electrode plate (28) and the negative electrode plate (29), and a circular hole is provided on the filler support sieve plate (34); The discharge port (36) is equipped with a discharge collection mechanism (32), and the discharge collection mechanism (32) is arranged on the top of the electrostatic separator tank (27); The spherical filler is any one of glass balls and ceramic balls, the ball diameter is 1.5 mm to 10 mm, and the spherical filler contains any one of metal potassium oxide and metal sodium oxide, the content of which is 5% to 40%; The positive electrode plate (28) and the negative electrode plate (29) both include a square electrode plate frame (37), the electrode plate frame (37) is welded to the support beam (30), a number of round steels (38) are welded to the electrode plate frame (37), and a reinforcement support (39) is welded to the tail end of the round steel (38); The support beam (30) is divided into a positive auxiliary beam (53) and a negative auxiliary beam (35); the positive auxiliary beam (53) is connected to the electrostatic separator tank (27) via an insulating hanger (31); the positive electrode plate (28) is welded to the positive auxiliary beam (53); the negative auxiliary beam (35) is connected to the electrostatic separator tank (27) via a mounting bracket (40); and the negative electrode plate (29) is welded to the negative auxiliary beam (35).

2. An oil slurry desolidification process integrating chemical precipitation and electrostatic separation, characterized in that: The oil slurry desolidification equipment integrating chemical precipitation and electrostatic separation as claimed in claim 1 comprises the following steps: S1: Primary additive sedimentation, heating the oil slurry, injecting chemical agents into the heated oil slurry, and then mixing and stirring. After the stirring is completed, it is allowed to settle to remove some impurities; S2: Secondary electrostatic separation, the oil slurry after being freed from impurities is placed in a high-voltage electrostatic field with fillers, so that the solid impurities in the oil slurry are adsorbed on the fillers under the action of electrostatic force, thus achieving liquid-solid separation of the oil slurry.

3. The oil slurry desolidification process integrating chemical precipitation and electrostatic separation according to claim 2, characterized in that: The heating temperature for heating the slurry oil in S1 is 120°C to 180°C.

4. The oil slurry desolidification process integrating chemical precipitation and electrostatic separation according to claim 2, characterized in that: The chemical agents are demulsifiers, flocculants and modifiers.

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