Assistant all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit

Abstract

The utility model relates to an all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit auxiliaries, and belongs to the technical field of petrochemical engineering. Comprising a small bag unpacking station, mixing and conveying integrated equipment, an auxiliary storage bin, a high-precision dust remover, a continuous differential self-adding instrument, a DCS (Distributed Control System) and a reaction and recharging system. According to the all-in-one on-line weighing continuous differential self-adding instrument system for the catalytic cracking unit auxiliary agent, provided by the utility model, the auxiliary agent is proportioned from a small bag material unloading station, and the all-in-one auxiliary agent is uniformly mixed and conveyed in a closed manner until the continuous differential self-adding to a regenerator (the regenerator back pressure (0.4-0.6 MPa (G)) is finished under the working condition of high back pressure (0.4-0.6 MPa (G)) at the minimum feeding amount (4-20kg / h); by unpacking small bags, uniformly mixing a plurality of assistants, conveying to an assistant storage bin, weighing, and continuously feeding to a reaction system by a continuous differential self-adding instrument under the working condition of high back pressure, the problem of continuous fine feeding of 4-20kg / h is solved. The problems of all-in-one mixing, metering and continuous and stable feeding of the auxiliary to a reaction system are fundamentally solved.

Description

Technical Field

[0001] The utility model relates to an all-in-one online weighing and continuous differential self-adding instrument system for additives in a catalytic cracking unit. After proportioning, uniform mixing is performed, online weighing and metering are performed, and continuous trace and differential addition is achieved under high back pressure conditions. The system is mainly used in catalytic cracking units in petrochemical enterprises. It is an all-in-one additive mixing, online weighing and metering, and continuous differential self-adding instrument system under high back pressure conditions, and belongs to the technical field of petrochemical industry. Background Art

[0002] At present, the combustion aid, desulfurization and denitrification aid and other additives of the catalytic cracking unit of the refinery are usually added to the regenerator in an intermittent manner. Since the amount and time of the combustion aid are unstable, the charring effect of the regenerator is affected; the combustion aid, desulfurization and denitrification agent and other additives are not mixed evenly, and cannot be continuously added to the regenerator under high back pressure conditions, which affects the efficiency of desulfurization and denitrification and is not conducive to the overall smooth operation of the device.

[0003] Therefore, providing an all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit additives to solve the problems of uneven mixing, inaccurate metering, and intermittent addition of materials, which affect the coking effect of the regenerator and the desulfurization and denitrification efficiency, has become a technical problem that urgently needs to be solved in this technical field. Utility Model Content

[0004] The purpose of the utility model is to provide an all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking additives, which can add a variety of additives to a mixing tank after dust-free unpacking in a certain proportion, and after the different additives are evenly mixed by pneumatic force in the mixing tank, they are transported to a temporary storage silo for storage; a continuous differential self-adding instrument is arranged at the bottom of the storage silo, and the mixed additives are injected into the regenerator steadily and evenly in a continuous feeding manner, so as to avoid the uneven addition of combustion aids in the traditional way affecting the charring effect of the regenerator, and the unstable addition of other additives, which has an adverse effect on the operation of the device, and further improve the refined operation level of the reaction-regeneration system.

[0005] The above-mentioned purpose of the utility model is achieved by the following technical means:

[0006] The invention discloses an all-in-one online weighing continuous differential self-adding instrument system for additives in a catalytic cracking unit, characterized in that it comprises a small bag unpacking station, an integrated mixing and conveying device, an additive storage silo, a high-precision dust collector, a continuous differential self-adding instrument, a control system and a re-regeneration system; one end of the small bag unpacking station is connected to one end of the integrated mixing and conveying device, the bottom end of the integrated mixing and conveying device is connected to the additive storage silo, the other end of the integrated mixing and conveying device is connected to the re-regeneration system, a high-precision dust collector is installed on the top of the additive storage silo, the lower discharge port of the additive storage silo is connected to the continuous differential self-adding instrument, the continuous differential self-adding instrument is connected to the re-regeneration system, and the control system is respectively connected to the small bag unpacking station, the integrated mixing and conveying device, the additive storage silo, the high-precision dust collector and the continuous differential self-adding instrument.

[0007] Preferably, the integrated mixing and conveying equipment comprises: a main air intake pipeline, an air intake valve, a back-blowing valve group, a feed valve, a metal filter element, a pressure transmitter, an exhaust valve, a tank body, a spray valve group, a discharge valve, and a conveying valve; the tank body comprises a tank body end cover, a tank body upper part, a tank body waist and a lower cone body, the back-blowing valve group and the feed valve are arranged on one side of the tank body end cover of the tank body, the exhaust valve is arranged on the other side of the tank body end cover of the tank body, the pressure transmitter is arranged on the tank body upper part of the tank body and is connected to the tank body through a pipeline The metal filter element is arranged below the tank end cover of the tank body, the air inlet valve is arranged on the tank waist of the tank body, the discharge valve is arranged on the bottom end of the lower cone of the tank body, the total air inlet pipeline is respectively connected with the air inlet valve, the blowing valve group and the delivery valve, the back-blowing valve group is connected with the inlet of the metal filter element, the sealing cavity above the metal filter element is connected with the exhaust valve, the exhaust valve is connected with the auxiliary agent storage silo, the air inlet of the delivery valve is connected with the total air inlet pipe, and the other end of the delivery valve is connected with the acceleration ejector below the discharge valve.

[0008] Preferably, there are six spray valve groups, which are evenly arranged on the lower cone of the tank body.

[0009] Preferably, the continuous differential self-adding instrument comprises: an air intake pipeline, a first air intake valve, a silo exhaust valve, a feed valve, a weight loss silo, a double-axis spiral differential feeder, a cut-off valve, a second air intake valve, a negative pressure differential feeder, and a differential feeder discharge valve; the inlet of the feed valve is connected to the outlet of the additive storage silo, the feed valve is connected to the feed inlet of the weight loss silo through a metal soft connection, the lower end of the weight loss silo is connected to the double-axis spiral differential feeder, the silo exhaust valve is arranged on one side of the upper end of the weight loss silo, and the silo discharge valve is arranged on the upper end of the weight loss silo. The air valve is connected to the auxiliary agent storage silo via a metal flexible connection, a shut-off valve is provided at the outlet of the double-axis screw differential feeder, the shut-off valve is connected to the negative pressure differential feeder via a metal flexible connection, the outlet end of the second air inlet valve is connected to the negative pressure differential feeder, the air inlet pipeline is connected to the inlet ends of the first air inlet valve and the second air inlet valve, the outlet end of the first air inlet valve is connected to the negative pressure differential feeder, the lower end of the negative pressure differential feeder is connected to one end of the differential feeding discharge valve, and the other end of the differential feeding discharge valve is connected to the reverse system.

[0010] Preferably, the negative pressure differential feeder includes: a gas acceleration injector, an air inlet, a negative pressure feed port, a negative pressure feeder cavity, and an acceleration injector; wherein, the gas acceleration injector passes through the negative pressure feeder cavity and is connected to the left side of the acceleration injector, the inlet end of the gas acceleration injector is connected to the air inlet pipeline, the air inlet is located above the negative pressure feeder cavity, the air inlet is connected to the first air inlet valve, the negative pressure feed port is located on the right side of the negative pressure feeder cavity, the negative pressure feed port is connected to the cut-off valve, and the negative pressure feeder cavity is connected to the acceleration injector below.

[0011] Preferably, the control system is a programmable logic controller (DCS) control system.

[0012] Beneficial effects:

[0013] The utility model is used for a catalytic cracking unit additive all-in-one online weighing continuous differential self-adding instrument system, which starts from the additive proportioning of the small bag unloading station, the uniform mixing and closed transportation of the all-in-one additives, until the continuous differential self-adding of a very small feed amount (4-20kg / h) under high back pressure (0.4-0.6MPa(G)) to the regenerator (regenerator back pressure (0.4-0.6MPa(G)) ends, through small bag unloading, uniform mixing of multiple additives, and then transportation to the additive storage silo, after weighing, the continuous differential self-adding instrument continuously feeds to the regeneration system under high back pressure conditions, thereby solving the problem of 4-20kg / h continuous fine feeding.

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific implementations, but this does not necessarily limit the scope of protection of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic structural diagram of an all-in-one online weighing and continuous differential self-adding instrument system for additives in a catalytic cracking unit according to Example 1 of the utility model.

[0016] Figure 2 This is a schematic diagram of the structure of the integrated mixing and conveying equipment in the all-in-one online weighing continuous differential self-adding instrument system for additives in a catalytic cracking unit according to Example 1 of the utility model.

[0017] Figure 3 This is a schematic structural diagram of a continuous differential self-adding instrument with extremely small feed rate (4-20 kg / h) under high back pressure (0.4-0.6 MPa (G)) conditions in Example 1 of the utility model for an all-in-one online weighing continuous differential self-adding instrument system for additives in a catalytic cracking unit.

[0018] Figure 4 This is a schematic structural diagram of a negative pressure differential feeder in an all-in-one online weighing continuous differential self-adding instrument system for additives in a catalytic cracking unit according to Example 1 of the utility model.

[0019] Names of main parts in the attached figure:

[0020] 1Small bag unpacking station 2Integrated mixing and conveying equipment

[0021] 2-1 Main air intake line 2-2 Air intake valve

[0022] 2-3 Backflush valve group 2-4 Feed valve

[0023] 2-5 Metal filter element 2-6 Pressure transmitter

[0024] 2-7 Exhaust valve 2-8 Tank

[0025] 2-9 injection valve group 2-10 discharge valve

[0026] 2-11 Delivery valve 3 Additive storage silo

[0027] 4High precision dust collector 5Continuous differential self-adding instrument

[0028] 5-1 Intake pipeline 5-2 First intake valve

[0029] 5-3 Silo exhaust valve 5-4 Feed valve

[0030] 5-5 Weight loss silo 5-6 Double shaft spiral differential feeder

[0031] 5-7 Cut-off valve 5-8 Second intake valve

[0032] 5-9 Negative pressure differential feeder

[0033] 5-9-1 Gas acceleration injector 5-9-2 Air inlet

[0034] 5-9-3 Negative pressure feed port 5-9-4 Negative pressure feeder cavity

[0035] 5-9-5 Accelerator Injector 5-10 Differential Feed and Discharge Valve

[0036] 6DCS control system

[0037] 7 Anti-recycling system DETAILED DESCRIPTION

[0038] Unless otherwise specified, the components used in the device of the utility model are all conventional components available on the market in the technical field; the equipment not described in detail is equipment available on the market; the control systems used are all conventional control systems in the technical field; the software used are all conventional software in the technical field;

[0039] Example 1

[0040] like Figure 1 As shown, it is a structural schematic diagram of an all-in-one online weighing continuous differential self-adding instrument system for additives in a catalytic cracking unit according to Example 1 of the utility model; Figure 2 As shown, it is a structural schematic diagram of the mixing and conveying integrated equipment in the all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit additives in Example 1 of the utility model; Figure 3 As shown, it is a schematic diagram of the structure of the continuous differential self-adding instrument in the all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit additives in Example 1 of the utility model; Figure 4 The present invention is a schematic structural diagram of a negative pressure differential feeder in an all-in-one online weighing continuous differential self-adding instrument system for additives in a catalytic cracking unit according to Example 1 of the present invention; wherein 1 is a small bag unpacking station, 2 is an integrated mixing and conveying device, 3 is an additive storage silo, 4 is a high-precision dust collector, 5 is a continuous differential self-adding instrument, 6 is a DCS control system, 7 is a back-recycling system, 2-1 is a main air intake pipeline, 2-2 is an air intake valve, 2-3 is a back-blowing valve group, 2-4 is a feed valve, 2-5 is a metal filter element, 2-6 is a pressure transmitter, 2-7 is an exhaust valve, 2-8 is a tank body, and 2- 9 is a spray valve group, 2-10 is a discharge valve, 2-11 is a conveying valve, 5-1 is an air intake pipeline, 5-2 is a first air intake valve, 5-3 is a silo exhaust valve, 5-4 is a feed valve, 5-5 is a weight loss silo, 5-6 is a double-axis screw differential feeder, 5-7 is a cut-off valve, 5-8 is a second air intake valve, 5-9 is a negative pressure differential feeder, 5-9-1 is a gas acceleration injector, 5-9-2 is an air inlet, 5-9-3 is a negative pressure feed inlet, 5-9-4 is a negative pressure feeder cavity, 5-9-5 is an acceleration injector, and 5-10 is a differential feeding discharge valve;

[0041] The utility model is an all-in-one online weighing continuous differential self-adding instrument system for additives in a catalytic cracking unit, comprising a small bag unpacking station 1, a mixing and conveying integrated device 2, an additive storage silo 3, a high-precision dust collector 4, a continuous differential self-adding instrument 5, a DCS control system 6, a back-recycling system 7, a total air intake pipeline 2-1, an air intake valve 2-2, a back-blowing valve group 2-3, a feed valve 2-4, a metal filter element 2-5, a pressure transmitter 2-6, an exhaust valve 2-7, a tank body 2-8, a blow valve group 2-9, and a discharge valve 2-10, conveying valve 2-11, air intake pipeline 5-1, first air intake valve 5-2, silo exhaust valve 5-3, feed valve 5-4, weight loss silo 5-5, double-axis screw differential feeder 5-6, cut-off valve 5-7, second air intake valve 5-8, negative pressure differential feeder 5-9, gas acceleration injector 5-9-1, second air intake port 5-9-2, negative pressure feed port 5-9-3, negative pressure feeder cavity 5-9-4, acceleration injector 5-9-5, differential feeding discharge valve 5-10;

[0042] The discharge port of the small bag unpacking station 1 is connected to the feed port of the mixing and conveying integrated equipment 2, the discharge port of the mixing and conveying integrated equipment 2 is connected to the additive storage silo 3 through a pipeline, one end of the additive storage silo 3 is connected to the high-precision dust collector 4, the discharge port of the additive storage silo 3 is connected to the feed port of the continuous differential self-adding instrument 5, the continuous differential self-adding instrument 5 is connected to the anti-re-system 7, and the DCS control system 6 is respectively connected to the small bag unpacking station 1, the mixing and conveying integrated equipment 2, the additive storage silo 3, the high-precision dust collector 4, and the continuous differential self-adding instrument 5;

[0043] The mixing and conveying integrated equipment 2 includes: a main air intake pipeline 2-1, an air intake valve 2-2, a back-blowing valve group 2-3, a feed valve 2-4, a metal filter element 2-5, a pressure transmitter 2-6, an exhaust valve 2-7, a tank body 2-8, a spray valve group 2-9, a discharge valve 2-10, and a conveying valve 2-11; the tank body 2-8 includes a tank body end cover, a tank body upper part, a tank body waist and a lower cone, the back-blowing valve group 2-3 and the feed valve 2-4 are arranged on one side of the tank body end cover of the tank body 2-8, the exhaust valve 2-7 is arranged on the other side of the tank body end cover of the tank body 2-8, the pressure transmitter 2-6 is arranged on the upper part of the tank body 2-8 and is connected to the tank body 2-8 through a pipeline, and the metal filter element 2-5 is arranged at the tank body end of the tank body 2-8. Below the cover, the air inlet valve 2-2 is arranged on the waist of the tank body 2-8, there are six blowing valve groups 2-9, which are evenly arranged on the lower cone of the tank body 2-8, and the discharge valve 2-10 is arranged at the bottom end of the lower cone of the tank body 2-8. The total air inlet pipeline 2-1 is respectively connected to the air inlet valve 2-2, the blowing valve group 2-9, and the delivery valve 2-11, the back-blowing valve group 2-3 is connected to the inlet of the metal filter element 2-5, and the sealing cavity above the metal filter element 2-5 is connected to the exhaust valve 2-7, and the exhaust valve 2-7 is connected to the auxiliary agent storage silo 3. The air inlet of the delivery valve 2-11 is connected to the total air inlet pipe 2-1, and the other end of the delivery valve 2-11 is connected to the discharge valve 2-10 through the lower booster injector and the auxiliary agent storage silo 3.

[0044] The continuous differential self-adding instrument 5 includes: an air intake pipeline 5-1, a first air intake valve 5-2, a silo exhaust valve 5-3, a feed valve 5-4, a weight loss silo 5-5, a double-axis screw differential feeder 5-6, a cut-off valve 5-7, a second air intake valve 5-8, a negative pressure differential feeder 5-9, and a differential feeding discharge valve 5-10; the inlet of the feed valve 5-4 is connected to the outlet of the additive storage silo 3, the outlet of the feed valve 5-4 is connected to the inlet of the weight loss silo 5-5 through a metal flexible connection, the lower end of the weight loss silo 5-5 is connected to the double-axis screw differential feeder 5-6, the silo exhaust valve 5-3 is arranged on one side of the upper end of the weight loss silo 5-5, and the silo exhaust valve 5-4 is arranged on one side of the upper end of the weight loss silo 5-5. The air valve 5-3 is connected to the auxiliary agent storage silo 3 via a metal flexible connection, the outlet of the double-axis screw differential feeder 5-6 is provided with a shut-off valve 5-7, the shut-off valve 5-7 is connected to the negative pressure differential feeder 5-9 via a metal flexible connection, the outlet end of the second air intake valve 5-8 is connected to the negative pressure differential feeder 5-9, the air intake pipeline 5-1 is connected to the inlet ends of the first air intake valve 5-2 and the second air intake valve 5-8, the outlet end of the first air intake valve 5-2 is connected to the negative pressure differential feeder 5-9, the lower end of the negative pressure differential feeder 5-9 is connected to one end of the differential feeding discharge valve 5-10, and the other end of the differential feeding discharge valve 5-10 is connected to the reverse system 7;

[0045] The negative pressure differential feeder 5-9 includes: a gas acceleration injector 5-9-1, an air inlet 5-9-2, a negative pressure feed port 5-9-3, a negative pressure feeder cavity 5-9-4, and an acceleration injector 5-9-5; wherein, the gas acceleration injector 5-9-1 passes through the negative pressure feeder cavity 5-9-4 and is welded to the left side of the acceleration injector 5-9-5, the inlet end of the gas acceleration injector 5-9-1 is connected to the air inlet pipeline 5-1, the air inlet 5-9-2 is located above the negative pressure feeder cavity 5-9-4, the air inlet 5-9-2 is connected to the first air inlet valve 5-2, the negative pressure feed port 5-9-3 is located on the right side of the negative pressure feeder cavity 5-9-4, the negative pressure feed port 5-9-3 is connected to the cut-off valve 5-7, and the negative pressure feeder cavity 5-9-4 is connected to the acceleration injector 5-9-5 below.

[0046] According to the hardware of the utility model, on the basis of the existing DCS control system, the DCS control system 6 of the utility model can be obtained by using conventional software; the innovation of the utility model lies in the hardware; the DCS control system 6 of the utility model collects the signals of the equipment switch, transmitter and feedback device through the conventional programmable logic controller, judges the execution through the preset process flow, and outputs to the specific valve, motor, solenoid valve, and weighing sensor through the programmable logic controller. Therefore, the control system actuator can perform the corresponding control according to the preset process flow.

[0047] The operating steps of the multi-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit additives in Example 1 of the utility model are as follows: the various additives of the catalytic cracking unit are unpacked through the small bag unpacking station 1, and the dust-containing gas during unpacking is exhausted by the fan on the upper part of the small bag unpacking station 1 and filtered through the precision filter bag to be discharged as clean air. The proportioned additives are pneumatically mixed evenly by the mixing and conveying integrated equipment 2, and then conveyed to the additive storage silo 3 under closed positive pressure. The dust-containing gas during conveying is filtered by the high-precision dust collector 4. To meet the emission standards, the additives in the additive storage silo 3 flow into the continuous differential self-adding instrument 5 through the feed valve 5-4, are weighed by the weight loss silo 5-5, and then run at the set frequency of the double-axis spiral differential feeder 5-7, and are evenly fed to the negative pressure differential feeder 5-10. The first air inlet valve 5-2 and the second air inlet valve 5-8 control the air volume of the negative pressure differential feeder 5-9, so that the negative pressure differential feeder 5-9 generates a slight negative pressure, which is transported to the anti-recycling system 7 by compressed air through the differential feeder discharge valve 5-10;

[0048] The operation mechanism of the integrated mixing and conveying equipment 2 is as follows: after the proportion of multiple additives is adjusted, the feed valve 2-4 and the exhaust valve 2-7 are opened, and the additives enter the tank body 2-8. When the set weight is reached, the feed valve 2-4 is closed, and the spray valve group 2-9 is opened to spray for 0.5 to 10 seconds. The additives are sprayed along the set running track in the tank body 2-8. The spray valve group 2-9 sprays alternately in units of 3 groups. The additives pulsating upward are blocked by the metal filter element 2-5 and fall down. The dust-containing gas is filtered through the metal filter element 2-5 as clean gas and discharged through the exhaust valve 2-7. The outer surface of the metal filter element 2-5 is attached with dust. The additive is purged through the back-blowing valve group 2-3, cleaned and regenerated, the spray valve group 2-9 is closed, and it stops for 3-10 seconds. When the pressure rises back to the set pressure, the spray valve group 2-9 is opened again, and it is sprayed again. This is repeated for 5-15 minutes. After the additive is evenly mixed, the exhaust valve 2-7 is closed, the air inlet valve 2-2 is opened, and the tank is started to be filled with air. When the air reaches the high pressure point set by the pressure transmitter 2-6, the high-precision dust collector 4 is opened, the delivery valve 2-11 and the discharge valve 2-10 are opened, and the delivery is started. When the pressure transmitter 2-6 reaches the low pressure point, the delivery is finished;

[0049] The operation mechanism of the continuous differential self-adding instrument 5 is as follows: open the second air inlet valve 5-8 and the first air inlet valve 5-2 in sequence, and then open the differential feeding and discharging valve 5-10. According to the process requirements, adjust the gas volume and pressure to make the pipeline under the cut-off valve 5-7 and the negative pressure differential feeder 5-9 have a slight negative pressure (-0.01 to -0.05Mpa); then open the silo exhaust valve 5-3 and the feed valve 5-4, and the additive in the additive storage silo 3 flows by gravity into the weight loss silo 5-5 for weighing; reach the set pressure. After the weight is determined, the feed valve 5-4 is closed, the double-axis screw differential feeder 5-6 is opened, and the feed is evenly fed to the negative pressure differential feeder 5-9 according to the set feed frequency. Through the negative pressure differential feeder 5-9, the reverse pressure under the high back pressure (0.4-0.6MPa(G)) working condition is converted into a slight negative pressure at the inlet of the negative pressure differential feeder 5-9, and the additive is fed to the regeneration system 7 through the differential feeder discharge valve 5-10 at a very small feed rate (4-20kg / h) through compressed air;

[0050] The operating mechanism of the negative pressure differential feeder 5-9 is as follows: compressed air enters the re-entry system 7 through the gas acceleration ejector 5-9-1 and the acceleration ejector 5-9-5. The pressure of the compressed air passing through is greater than the pressure returned by the re-entry system 7, so that a slight negative pressure is formed in the cavity of the acceleration ejector 5-9-5; then, the compressed air passes through the air inlet 5-9-2 again, so that a slight negative pressure is formed in the cavity 5-9-4 of the negative pressure feeder, and the compressed air and the material are mixed with the additive entering from the negative pressure feed port 5-9-3. The compressed air and the material are sent to the re-entry system 7 through the acceleration ejector 5-9-5. This process adopts an ingenious structural design, so that the outlet of the negative pressure feeder cavity 5-9-4 and the negative pressure feed port 5-9-3 form a slight negative pressure, which solves the continuous feeding process of the back pressure (0.4~0.6MPa(G)) during the addition of the agent.

[0051] The utility model is used for an all-in-one online weighing continuous differential self-adding instrument system for additives in a catalytic cracking unit. It relies on unpacking of small bags, mixing and conveying of pneumatic mixing and conveying integrated equipment, storage of additive storage silos, dust removal of high-precision dust removal equipment, and continuous micro-feeding of a negative pressure differential self-adding instrument under high back pressure conditions, forming a complete process from unpacking to mixing, to continuous micro-feeding to a regenerator under high back pressure conditions. The whole process is free of dust leakage and fully automated program-controlled operation, solving the problems of temperature runaway and poor desulfurization and sulfur-nitration effects caused by intermittent and unbalanced addition of additives in the catalytic cracking unit, and at the same time providing a package solution for all-in-one mixing, metering, and continuous differential negative pressure feeding of additives, which helps to improve the refined operation level of the catalytic unit.

[0052] The utility model is used for the all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit additives. A variety of additives are unpacked from small bags, mixed evenly and then transported to the additive storage silo. The online weighing continuous differential self-adding instrument automatically runs at the set speed and automatically accumulates the feeding amount within the set time interval; after calculation and feedback by the control program, the feeding amount of the double-axis spiral differential feeder can be automatically adjusted to meet the continuous adjustment and dynamic balance of the feeding amount; the combustion aid and other additive mixtures are evenly fed by the differential quantitative feeder, and are evenly added to the re-entry system after being accelerated by the ejector. The whole system can also be automatically controlled by the DCS control system. It fundamentally solves the problems of all-in-one mixing, metering, and continuous and stable feeding of additives to the re-entry system.

[0053] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, according to the technical scheme and utility model concept of the utility model, shall be covered by the protection scope of the utility model.

Claims

1. An all-in-one online weighing and continuous differential self-adding instrument system for catalytic cracking unit additives, characterized by: It includes a small bag unpacking station, an integrated mixing and conveying equipment, an additive storage silo, a high-precision dust collector, a continuous differential self-adding instrument, a DCS control system and a reverse re-system; one end of the small bag unpacking station is connected to one end of the integrated mixing and conveying equipment, the bottom end of the integrated mixing and conveying equipment is connected to the additive storage silo, the other end of the integrated mixing and conveying equipment is connected to the reverse re-system, one end of the additive storage silo is connected to the high-precision dust collector, the other end of the additive storage silo is connected to the continuous differential self-adding instrument, the continuous differential self-adding instrument is connected to the reverse re-system, and the DCS control system is respectively connected to the small bag unpacking station, the integrated mixing and conveying equipment, the additive storage silo, the high-precision dust collector and the continuous differential self-adding instrument.

2. The all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit additives as claimed in claim 1, characterized in that: The mixing and conveying integrated equipment comprises: a total air intake pipeline, an air intake valve, a back-blowing valve group, a feed valve, a metal filter element, a pressure transmitter, an exhaust valve, a tank body, a spray valve group, a discharge valve, and a conveying valve; the tank body comprises a tank body end cover, a tank body upper part, a tank body waist and a lower cone body, the back-blowing valve group and the feed valve are arranged on one side of the tank body end cover of the tank body, the exhaust valve is arranged on the other side of the tank body end cover of the tank body, the pressure transmitter is arranged on the tank body upper part of the tank body and connected to the tank body through a pipeline, the metal filter element is arranged below the tank body end cover of the tank body, the air intake valve is arranged on the tank body waist of the tank body, the discharge valve is arranged at the bottom end of the lower cone of the tank body, the total air intake pipeline is respectively connected to the air intake valve, the spray valve group, and the conveying valve, the back-blowing valve group is connected to the inlet of the metal filter element, the sealing cavity above the metal filter element is connected to the exhaust valve, the exhaust valve is connected to the auxiliary agent storage silo, the air inlet of the conveying valve is connected to the total air intake pipe, and the other end of the conveying valve is connected to the acceleration injector below the discharge valve.

3. The all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit additives as claimed in claim 2, characterized in that: There are six spray valve groups, which are evenly arranged on the lower cone of the tank body.

4. The all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit additives as claimed in claim 3, characterized in that: The continuous differential self-adding instrument comprises: an air intake pipeline, a first air intake valve, a silo exhaust valve, a feed valve, a weight loss silo, a double-axis screw differential feeder, a cut-off valve, a second air intake valve, a negative pressure differential feeder, and a differential feeder discharge valve; the inlet of the feed valve is connected to the outlet of the additive storage silo, the outlet of the feed valve is connected to the upper end of the weight loss silo through a metal flexible connection, the lower end of the weight loss silo is connected to the double-axis screw differential feeder, the silo exhaust valve is arranged on one side of the upper end of the weight loss silo, and the silo exhaust valve is arranged on one side of the upper end of the weight loss silo. The valve is connected to the auxiliary agent storage silo via a metal flexible connection. The outlet of the double-axis screw differential feeder is provided with a cut-off valve, which is connected to the negative pressure differential feeder via a metal flexible connection. The outlet end of the second air inlet valve is connected to the negative pressure differential feeder. The air inlet pipeline is connected to the inlet ends of the first air inlet valve and the second air inlet valve. The outlet end of the first air inlet valve is connected to the negative pressure differential feeder. The lower end of the negative pressure differential feeder is connected to one end of the differential feeding discharge valve, and the other end of the differential feeding discharge valve is connected to the reverse system.

5. The all-in-one online weighing continuous differential self-adding instrument system for catalytic cracking unit additives as claimed in claim 4, characterized in that: The negative pressure differential feeder includes: a gas acceleration injector, an air inlet, a negative pressure feed port, a negative pressure feeder cavity, and an acceleration injector; wherein the gas acceleration injector passes through the negative pressure feeder cavity and is connected to the left side of the acceleration injector, the inlet end of the gas acceleration injector is connected to the air inlet pipeline, the air inlet is located above the negative pressure feeder cavity, the air inlet is connected to the first air inlet valve, the negative pressure feed port is located on the right side of the negative pressure feeder cavity, the negative pressure feed port is connected to the cut-off valve, and the negative pressure feeder cavity is connected to the acceleration injector below.

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