Fluidized bed reactor discharging system and method and electronic equipment

Abstract

The invention relates to the technical field of fluidized bed reactors, in particular to a fluidized bed reactor discharging system and method and electronic equipment.The system comprises an injection device and a discharging tank, a gas inlet of the injection device is connected to a first gas source through a first pipeline, and a gas outlet of the injection device is connected to a gas inlet of a fluidized bed reactor through a second pipeline; an injection port of the injection device is connected to a first exhaust port of the discharge tank through a third pipeline; a feed port of the discharge tank is connected to a discharge port of the fluidized bed reactor through a fourth pipeline, a second exhaust port of the discharge tank is connected to an air inlet of the fluidized bed reactor through a fifth pipeline, and a first air inlet of the discharge tank is connected to a circulating pipeline of the fluidized bed reactor through a sixth pipeline; the second air inlet of the discharging tank is further connected to a second air source through a seventh pipeline, and a discharging opening of the discharging tank is connected to a downstream device through an eighth pipeline. The efficiency of the condensed polyethylene production process can be improved, the gas recovery path is shortened, and the operation process is simplified.

Description

Technical Field

[0001] The invention relates to the technical field of fluidized bed reactors, and in particular to a fluidized bed reactor discharge system, method and electronic equipment. Background Art

[0002] Gas phase polymerization is one of the main processes for producing polyethylene, which generally includes several steps such as raw material refining, polymerization reaction, powder degassing, granulation, transportation, and packaging. In the polymerization reaction unit, refined ethylene, comonomer (1-butene-1 or 1-hexene or 1-octene), isopentane (induced condensing agent), hydrogen, nitrogen, etc. are added to the fluidized bed reactor, and polymerization reaction occurs under the action of catalyst and co-catalyst to produce polyethylene. The unreacted raw gas is discharged from the top of the fluidized bed reactor, and is recycled after being pressurized by the circulating gas compressor and cooled by the circulating gas condenser. The circulating gas fluidizes the polyethylene powder in the fluidized bed reactor and removes the reaction heat through the circulating gas cooler. When the polymerization reaction in the fluidized bed reactor reaches a certain extent, the bed material level and / or weight reaches the set value, the discharge system is turned on to discharge the polyethylene solid in the fluidized bed reactor from the discharge port on the side wall of the reactor, and then transported to the product degassing bin by nitrogen or exhaust gas recovery gas. The nitrogen introduced from the lower part of the degassing bin carries the hydrocarbon components in the resin powder and is blown out from the top of the degassing bin into the exhaust gas recovery system to recover liquid materials such as comonomers and induced condensing agents, which are pumped back to the fluidized bed reactor. The non-condensable gas is sent back to the discharge system as a conveying gas, or partially discharged to the flare due to pressure control requirements.

[0003] At present, the demand for polyethylene resin is increasing, and it is of great significance to further improve the production capacity of existing industrial polyethylene devices. The biggest limiting factor for increasing the production capacity of gas-phase polyethylene is the removal of reaction heat. The existing technology proposes a "gas-phase fluidized bed polyethylene condensation process", which is to evaporate the easily condensable liquid in the reactor to remove the polymerization reaction heat, thereby doubling the time and space yield of polyethylene.

[0004] There are many systematic methods for discharging solid materials from fluidized bed containers for gas phase polyethylene condensation processes. However, the existing discharge systems and methods still have some potential problems: First, because the high-pressure gas mixture (carrying a large amount of raw gas or gas / liquid mixture) fills the pores inside and around the particles, it causes additional loss of unreacted raw materials. The lost gas needs to be replenished and circulated into the system through compression, condensation and other processes, which increases the equipment cost and energy consumption; Second, in the condensed state process, the condensate content of the material at the bottom of the fluidized bed polymerization reactor is relatively high. If the traditional discharge process is used, the discharge line from the lower part of the fluidized bed near the distribution plate is too high due to the high condensate content, which often leads to slow discharge rate and easy blockage. At the same time, a large amount of condensate is brought out in the discharged material, which not only loses the condensate medium, but also increases the workload of the subsequent degassing bin. Patent No. CN200780037815.5 filed on September 10, 2007 and Patent No. CN200780034097.6 filed on September 10, 2007 describe a discharge system for removing a solid / gas mixture from a fluidized bed pressure vessel. Although it reduces the loss of reaction raw materials and energy consumption, it not only fails to achieve the ideal application effect for the fluidized bed reactor in the condensation process, but also leads to greater energy consumption and a higher failure rate.

[0005] In order to improve the discharge efficiency of the fluidized bed reactor in the condensation process and reduce the entrainment waste and energy loss of raw materials, a Chinese invention patent with an application date of November 6, 2014 and an application number of CN201410645418.8 discloses a fluidized bed reactor discharge system that can be used in the condensation process. The system includes a settling container and a transfer container, and an ejector is arranged between the settling container and the fluidized bed reactor. Compared with the traditional discharge process, the loss of raw gas and energy loss can be significantly reduced. A Chinese invention patent with an application date of October 14, 2015 and an application number of CN201510662171.5 discloses a single gas phase fluidized bed discharge system and method for multi-zone polymerization reaction. The method sets a three-layer discharge port, each flash tank is equipped with two filters and two buffer tanks, and each set of discharge system is discharged at high frequency and pulsed to form a continuous and stable discharge flow, but the process flow is relatively complicated and the operation is difficult.

[0006] Although the existing discharge method improves the discharge efficiency of the fluidized bed reactor in the condensation process and reduces the waste of raw material entrainment and energy loss, it still requires a discharge tank and at least one transfer container, or at least a two-stage flash evaporation system. The equipment cost is high, the gas recovery path is long, the operation process is cumbersome, the filling cycle is long, and the product production rate is limited, which cannot meet the higher production requirements of the current new process. Summary of the invention

[0007] In view of the above problems, the present invention provides a fluidized bed reactor discharge system, method and electronic equipment.

[0008] The fluidized bed reactor discharge system provided by the present invention comprises:

[0009] An injection device is used to deliver raw gas to the fluidized bed reactor and perform a suction operation on the discharge tank; wherein the air inlet of the injection device is connected to the first gas source through a first pipeline, the exhaust port of the injection device is connected to the air inlet of the fluidized bed reactor through a second pipeline, and the ejection port of the injection device is connected to the first exhaust port of the discharge tank through a third pipeline;

[0010] A discharge tank is used to receive the material discharged from the fluidized bed reactor and transfer the material to the downstream device; wherein the feed port of the discharge tank is connected to the discharge port of the fluidized bed reactor through the fourth pipeline, the second exhaust port of the discharge tank is connected to the air inlet of the fluidized bed reactor through the fifth pipeline, the first air inlet of the discharge tank is connected to the circulation pipeline of the fluidized bed reactor through the sixth pipeline, the second air inlet of the discharge tank is connected to the second gas source through the seventh pipeline, and the discharge port of the discharge tank is connected to the downstream device through the eighth pipeline. Furthermore, each pipeline is provided with a control valve for controlling the opening and closing of the pipeline;

[0011] Among them, a first control valve is arranged on the first pipeline, a second control valve is arranged on the second pipeline, a third control valve is arranged on the third pipeline, a fourth control valve is arranged on the fourth pipeline, a fifth control valve is arranged on the fifth pipeline, a sixth control valve is arranged on the sixth pipeline, a seventh control valve is arranged on the seventh pipeline, and an eighth control valve is arranged on the eighth pipeline.

[0012] Furthermore, the system also includes:

[0013] a first gas purge pipeline, wherein a gas outlet of the first gas purge pipeline is connected to a first gas purge pipeline inlet on a fourth pipeline;

[0014] a second gas purge pipeline, wherein a gas outlet of the second gas purge pipeline is connected to a second gas purge pipeline inlet on the fifth pipeline;

[0015] A third gas purge pipeline, wherein a gas outlet of the third gas purge pipeline is connected to a third gas purge pipeline inlet on the second pipeline.

[0016] Furthermore, each gas purge pipeline is provided with a control valve for controlling the opening and closing of the gas purge pipeline;

[0017] Among them, a ninth control valve is arranged on the first gas purge pipeline, a tenth control valve is arranged on the second gas purge pipeline, and an eleventh control valve is arranged on the third gas purge pipeline.

[0018] Further, the first gas purge line inlet is located at a preset position between the fluidized bed reactor and the fourth control valve;

[0019] The second gas purge line inlet is located at a preset position between the fluidized bed reactor and the fifth control valve;

[0020] The third gas purge line inlet is located at a preset position between the fluidized bed reactor and the second control valve.

[0021] Furthermore, the system also includes:

[0022] A gas filter is arranged on the top of the discharge tank, and the third pipeline is connected to the first exhaust port of the discharge tank through the gas filter.

[0023] Furthermore, the sixth pipeline is connected to the first gas inlet of the discharge tank through a gas filter.

[0024] The fluidized bed reactor discharge method provided by the present invention is implemented based on the above system, and the method comprises:

[0025] Controlling the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline, and the eighth pipeline to perform a closing operation;

[0026] When the preset discharge conditions are met, the fourth pipeline and the fifth pipeline are controlled to perform an opening operation, so that the fluidized bed reactor discharges materials through the fourth pipeline and recovers gas overflowing from the discharge tank during the discharge process through the fifth pipeline;

[0027] After the discharge operation is completed, the fourth pipeline and the fifth pipeline are controlled to perform a closing operation, and the first pipeline, the second pipeline and the third pipeline are controlled to perform an opening operation, so that the injection device receives the raw gas from the first gas source through the first pipeline, transports the raw gas to the fluidized bed reactor through the second pipeline, and sucks the discharge tank through the third pipeline to reduce the pressure of the discharge tank;

[0028] After the pressure value of the discharge tank is reduced to a preset first pressure threshold, the third pipeline is controlled to perform a closing operation, and the seventh pipeline and the eighth pipeline are controlled to perform an opening operation, so that the conveying gas from the second gas source is input into the discharge tank through the seventh pipeline, so that the material in the discharge tank is transferred to the downstream device through the eighth pipeline;

[0029] After completing the material transfer, the seventh pipeline and the eighth pipeline are controlled to perform a closing operation, and the sixth pipeline is controlled to perform an opening operation. The discharge tank is pressurized through the sixth pipeline until the pressure value of the discharge tank reaches a preset second pressure threshold, and the sixth pipeline is controlled to perform a closing operation to wait for the next discharge.

[0030] Furthermore, the first pressure threshold is preset to be no greater than 1 MPag; the second pressure threshold is preset to be no less than 0.6 MPag.

[0031] Furthermore, when the preset discharge condition is met, the fourth pipeline and the fifth pipeline are controlled to perform the opening operation so that the fluidized bed reactor discharges through the fourth pipeline and recovers the gas overflowed from the discharge tank during the discharge process through the fifth pipeline, the method also includes:

[0032] The pressure value of the discharge tank is controlled within a preset pressure range, and the pressure difference between the fluidized bed reactor and the discharge tank is controlled within a preset pressure difference range.

[0033] The present invention also provides a computer-readable storage medium, wherein the computer program stored in the computer-readable storage medium implements the steps of the above method when executed by one or more processors.

[0034] The present invention also provides an electronic device, comprising a memory and one or more processors, wherein a computer program is stored in the memory, and the memory and the one or more processors are communicatively connected to each other, and when the computer program is executed by the one or more processors, the steps of the above method are executed.

[0035] The fluidized bed reactor discharge system, method and electronic equipment provided by the present invention have at least the following beneficial effects:

[0036] (1) A multifunctional discharge tank is provided. The discharge tank has two functions, namely, sedimentation and transfer. The sedimentation container and the transfer container are combined into one, which greatly simplifies the discharge process, significantly improves the discharge rate of the fluidized bed in the process, reduces the use of control valves, and reduces the probability of failure.

[0037] (2) The raw gas (high-pressure ethylene gas) is introduced into the injection device, and the gas in the discharge tank is sucked to reduce the pressure of the discharge tank. After the discharge tank is vented, the pressure can be reduced to below 0.01MPag. It is operated under a slightly positive or negative pressure to maximize the flash evaporation of low-molecular compounds adsorbed in the polymer, while reducing the amount of gas entering the subsequent system to a lower level. The remaining solid materials directly enter the downstream device (degassing bin) from the discharge tank, eliminating the transfer container in the original discharge system, reducing the circulation path of low-molecular compounds in the system, avoiding the introduction of impurities, reducing raw material consumption, and alleviating the devolatilization and recovery load of the subsequent system, which helps to improve product quality.

[0038] (3) A branch line (the sixth pipeline) is drawn out from the circulation pipeline of the fluidized bed reactor and connected to the first air inlet of the discharge tank. The circulating gas in the circulation pipeline of the fluidized bed reactor is used to pressurize the discharge tank after the material is transferred, thereby reducing the pipeline oscillation during the suction process in the subsequent discharge process. At the same time, the circulating gas flow rate can be adjusted to form a sufficient pressure difference between the fluidized bed reactor and the discharge tank, allowing the fluidized bed to discharge at a high position, reducing the liquid content in the discharged material, and ensuring the high discharge efficiency and quality of the fluidized bed reactor in the gas phase polyethylene condensing state process.

[0039] (4) The material discharged from the discharge tank has a lower liquid content, which can reduce the burden on the downstream device (degassing chamber) and reduce energy consumption. After the material in the discharge tank is transferred to the downstream device, the discharge tank is pressurized by circulating gas, which improves the recycling value of the circulating gas. The omitted transfer container reduces equipment costs, the simplified operation process reduces operating costs, and the shortened production cycle also increases the production capacity per unit time, which greatly improves the overall economic benefits of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a fluidized bed reactor discharge system provided in one embodiment of the present invention;

[0042] Figure 2 A schematic structural diagram of a fluidized bed reactor discharge system provided in yet another embodiment of the present invention;

[0043] Figure 3 A schematic diagram of the structure of a spray device provided by an embodiment of the present invention;

[0044] Figure 4 for Figure 3 Schematic diagram of the nozzle structure;

[0045] Figure 5 A flow chart of the steps of a method for discharging materials from a fluidized bed reactor provided in one embodiment of the present invention;

[0046] Figure 6 A schematic diagram of the structure of an electronic device provided in one embodiment of the present invention;

[0047] Reference numerals:

[0048] Figure 1 to Figure 2In: 1-injection device, 2-discharge tank, 3-fluidized bed reactor, 4-first control valve, 5-second control valve, 6-third control valve, 7-fourth control valve, 8-fifth control valve, 9-sixth control valve, 10-seventh control valve, 11-eighth control valve, 12-ninth control valve, 13-tenth control valve, 14-eleventh control valve, 15-raw gas compressor, 16-circulating gas compressor, 17-circulating gas condenser;

[0049] Figure 3 Middle: 20-receiving chamber, 21-nozzle, 22-mixing chamber, 23-diffuser, 24-working fluid, 25-injection fluid;

[0050] Figure 6 In it: 600 - electronic device, 601 - processor, 602 - communication bus, 603 - user interface, 604 - communication interface, 605 - memory. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the protection scope of the present invention. The "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth", and "eleventh" used in the claims and description of the present invention are only for the purpose of convenience of distinction, have no special meaning, and are not intended to limit the present invention.

[0052] In one embodiment of the present invention, a fluidized bed reactor discharge system is provided, such as Figure 1 As shown, the system includes:

[0053] The injection device 1 is used to transport raw gas to the fluidized bed reactor and perform suction operation on the discharge tank, wherein the air inlet of the injection device 1 is connected to the first gas source through the first pipeline a, the exhaust port of the injection device 1 is connected to the air inlet of the fluidized bed reactor 3 through the second pipeline b, and the injection port of the injection device 1 is connected to the first exhaust port of the discharge tank 2 through the third pipeline c.

[0054] and a discharge tank 2, for receiving materials discharged from the fluidized bed reactor and transferring the materials to a downstream device, wherein: the feed port of the discharge tank 2 is connected to the discharge port of the fluidized bed reactor 3 through a fourth pipeline d, the second exhaust port of the discharge tank 2 is connected to the air inlet of the fluidized bed reactor 3 through a fifth pipeline e, the first air inlet of the discharge tank 2 is connected to the circulation pipeline of the fluidized bed reactor through a sixth pipeline f, the second air inlet of the discharge tank 2 is connected to the second gas source through a seventh pipeline g, and the discharge port of the discharge tank 2 is connected to the downstream device through an eighth pipeline h.

[0055] Among them, the injection device 1 can be selected from Figure 3 The spray device shown in the figure, the nozzle of the spray device 1 can be selected from Figure 4 The nozzle shown in .

[0056] Specifically, the first gas source provides raw gas, and the raw gas is continuously transported to the injection device 1 through the first pipeline a, so that the injection device 1 can operate continuously. In one implementation, the raw gas is ethylene gas, and the ethylene gas provided by the first gas source is first compressed and pressurized by the raw gas compressor 15 to obtain high-pressure ethylene gas, and then transported to the injection device 1 through the first pipeline a. The high-pressure ethylene gas can specifically be ethylene gas with a pressure greater than or equal to 5MPa. The second gas source provides conveying gas, and the conveying gas enters the discharge tank 2 through the seventh pipeline g, so that the material in the discharge tank 2 is transferred to the downstream device by the conveying gas. In one implementation, the second gas source uses an exhaust gas recovery system to provide conveying gas, and the conveying gas uses PDS conveying gas from the exhaust gas recovery system. The fluidized bed reactor circulation pipeline is a circulation pipeline in the fluidized bed reaction system, wherein the fluidized bed reaction system includes a fluidized bed reactor 3, a circulation gas compressor 16, and a circulation gas condenser 17, and the three are connected in sequence to form a circulation gas loop, and the pipeline in the circulation gas loop is the circulation pipeline in the fluidized bed reaction system. For further information, see Figure 1 or Figure 2 The sixth pipeline f is connected to the pipeline between the circulating gas compressor 16 and the circulating gas condenser 17, so as to receive the circulating gas compressed by the circulating gas compressor 16. The downstream device is a degassing chamber.

[0057] More specifically, each pipeline is provided with a control valve for controlling the opening and closing of the pipeline, wherein a first control valve 4 is provided on the first pipeline a, a second control valve 5 is provided on the second pipeline b, a third control valve 6 is provided on the third pipeline c, a fourth control valve 7 is provided on the fourth pipeline d, a fifth control valve 8 is provided on the fifth pipeline e, a sixth control valve 9 is provided on the sixth pipeline f, a seventh control valve 10 is provided on the seventh pipeline g, and an eighth control valve 11 is provided on the eighth pipeline h.

[0058] In this embodiment, the opening and closing of the control pipeline is achieved by opening and closing the control valve on the control pipeline.

[0059] In one implementation of the present embodiment, the first control valve 4, in addition to controlling the opening and closing of the first pipeline a, can also control the gas flow rate of the raw gas entering the injection device 1 from the first gas source; the third control valve 6, in addition to controlling the opening and closing of the third pipeline c, is also used to control the gas flow rate of the residual gas in the discharge tank 2 to the injection device 1; the fourth control valve 7, in addition to controlling the opening and closing of the fourth pipeline d, is also used to control the material flow rate; the sixth control valve 9, in addition to controlling the opening and closing of the sixth pipeline f, is also used to control the amount of circulating gas flow entering the discharge tank 2 from the circulating pipeline of the fluidized bed reactor; the seventh control valve 10, in addition to controlling the opening and closing of the seventh pipeline g, is also used to control the amount of conveying gas flow rate.

[0060] The discharge method of the fluidized bed reactor discharge system provided in this embodiment is as follows:

[0061] (1) Control the third pipeline c, the fourth pipeline d, the fifth pipeline e, the sixth pipeline f, the seventh pipeline g, and the eighth pipeline h to perform a closing operation.

[0062] (2) When the preset discharge conditions are met, the fourth pipeline d and the fifth pipeline e are controlled to perform an opening operation, so that the fluidized bed reactor 3 discharges through the fourth pipeline d and recovers the gas overflowing from the discharge tank 2 during the discharge process through the fifth pipeline e.

[0063] Specifically, the preset discharge condition is pre-set by those skilled in the art, and the present invention is not limited thereto. In one implementation, the preset discharge condition is that the bed level and / or weight in the fluidized bed reactor reaches a set value.

[0064] After the fourth pipeline d is controlled to perform the opening operation, the material in the fluidized bed reactor 3 is discharged from the discharge port of the fluidized bed reactor 3 into the discharge tank 2 through the fourth pipeline d under the action of pressure difference and gravity. As the material enters the discharge tank 2, a large amount of raw gas or gas / liquid mixture is carried between the solid particles and in the gaps. During the material discharging process, a part of the gas is precipitated from the material and returned to the fluidized bed reactor 3 through the fifth pipeline e.

[0065] (3) After the discharge operation is completed, the fourth pipeline d and the fifth pipeline e are controlled to perform a closing operation, and the first pipeline a, the second pipeline b and the third pipeline c are controlled to perform an opening operation, so that the injection device 1 receives the raw gas from the first gas source through the first pipeline a, transports the raw gas to the fluidized bed reactor 3 through the second pipeline b, and sucks the discharge tank 2 through the third pipeline c to reduce the pressure of the discharge tank.

[0066] Specifically, when the material is no longer transferred from the fluidized bed reactor 3 to the discharge tank 2, and a balance is formed between the two, the discharge operation is completed. After the discharge operation is completed, the material in the discharge tank 2 still carries a large amount of raw gas or gas / liquid mixture. By controlling the third pipeline c to perform the opening operation, the discharge tank 2 is sucked to decompress the discharge tank 2. The gas precipitated during the decompression process is recovered to the injection device 1 through the third pipeline e, and is input into the fluidized bed reactor 3 together with the raw gas received by the injection device 1, thereby further realizing the recovery and utilization of the unreacted raw gas.

[0067] (4) After the pressure value of the discharge tank 2 is reduced to a preset first pressure threshold, the third pipeline c is controlled to perform a closing operation, and the seventh pipeline g and the eighth pipeline h are controlled to perform an opening operation, so that the conveying gas from the second gas source is input into the discharge tank 2 through the seventh pipeline g, and the material in the discharge tank 2 is transferred to the downstream device through the eighth pipeline h.

[0068] Furthermore, by means of high-frequency, pulsed discharge, the gathered product materials can be continuously and stably transferred to the downstream device.

[0069] (5) After completing the material transfer, the seventh pipeline g and the eighth pipeline h are controlled to perform a closing operation, and the sixth pipeline f is controlled to perform an opening operation. The discharge tank 2 is pressurized through the sixth pipeline f until the pressure value of the discharge tank 2 reaches a preset second pressure threshold, so as to control the sixth pipeline f to perform a closing operation to wait for the next discharge.

[0070] After the material transfer is completed, the pressure of the discharge tank 2 returns to normal pressure due to the connection with the outside world, while the pressure in the fluidized bed reactor 3 is 2.0-2.4 MPa. After closing the eighth pipeline h, circulating gas is introduced into the discharge tank 2 to increase the pressure of the discharge tank 2 to 1.0-1.1 MPa, thereby providing an appropriate pressure difference between the fluidized bed reactor 3 and the discharge tank 2 for the next material discharge, thereby ensuring that the material discharged from the reactor can enter the discharge tank 2 under sufficient pressure difference, and preventing the pipeline from oscillating violently due to excessive pressure difference.

[0071] Specifically, the first pressure threshold and the second pressure threshold are set by those skilled in the art according to actual needs, and the present invention does not limit this. The first pressure threshold is preferably a value not greater than 1 MPag, more preferably a value not greater than 0.5 MPag, more preferably a value not greater than 0.1 MPag, and more preferably a value not greater than 0.01 MPag; the second pressure threshold is preferably a value not less than 0.6 MPag.

[0072] In one implementation, during discharge, the raw gas flow rate entering the injection device 1 is adjusted to 5 t / h to 15 t / h, and the pressure of the discharge tank 2 is reduced from 1.1 MPa to 0.6 MPa to 0.7 MPa by suction. After suction, the material in the discharge tank 2 is transferred to the downstream device under the transportation of the second gas source. After the transfer is completed, the pressure of the discharge tank 2 returns to normal pressure, and the circulating gas flow rate of the sixth pipeline f is adjusted to 5 t / h to 15 t / h, and the pressure of the discharge tank 2 is increased to 1.0 MPa to 1.1 MPa.

[0073] The fluidized bed reactor discharge system provided in the present embodiment is provided with a multifunctional discharge tank, which has two functions of sedimentation and transfer, and is a dual-purpose tank, which combines the sedimentation container and the transfer container into one, greatly simplifies the discharge process, significantly improves the discharge rate of the fluidized bed in the process, reduces the use of the control valve, and reduces the probability of failure. The raw material gas (high-pressure ethylene gas) is introduced into the injection device, and the gas in the discharge tank is sucked to reduce the pressure of the discharge tank. After the discharge tank is exhausted, the pressure can be reduced to below 0.01MPag, and the discharge tank is operated under a slight positive pressure or negative pressure, so that the low molecular weight compounds adsorbed in the polymer are flashed out to the greatest extent, and the gas amount entering the rear system is reduced to a lower level at the same time. The remaining solid materials directly enter the downstream device (degassing bin) from the discharge tank, eliminating the transfer container in the original discharge system, reducing the path of the low molecular weight compounds circulating in the system, avoiding the introduction of impurities, reducing the raw material consumption, and reducing the devolatilization and recovery load of the rear system, which helps to improve the product quality. A branch line (sixth pipeline) is drawn out from the circulating pipeline of the fluidized bed reactor and connected to the first air inlet of the discharge tank. The circulating gas in the circulating pipeline of the fluidized bed reactor is used to pressurize the discharge tank after the material is transferred, so as to reduce the pipeline oscillation during the subsequent discharge process. At the same time, the circulating gas flow rate can be adjusted to form a sufficient pressure difference between the fluidized bed reactor and the discharge tank, allowing the fluidized bed to discharge at a high position, reducing the liquid content in the discharged material, and ensuring the high discharge efficiency and quality of the fluidized bed reactor in the gas phase polyethylene condensation process. The material discharged from the discharge tank has a lower liquid content, which can reduce the burden of the downstream device (degassing bin) and reduce energy consumption. After the material in the discharge tank is transferred to the downstream device, the discharge tank is pressurized by the circulating gas, which improves the recycling value of the circulating gas, eliminates the transfer container and reduces the equipment cost, simplifies the operation process and reduces the operating cost, shortens the production cycle and also increases the production capacity per unit time, so that the overall economic benefits of the process are greatly improved.

[0074] In another embodiment of the present invention, Figure 4 As shown, the system also includes:

[0075] A first gas purge pipeline i, wherein a gas outlet of the first gas purge pipeline i is connected to a first gas purge pipeline inlet on a fourth pipeline d;

[0076] A second gas purge pipeline j, wherein the gas outlet of the second gas purge pipeline j is connected to the second gas purge pipeline inlet on the fifth pipeline e;

[0077] A third gas purge pipeline k, wherein the gas outlet of the third gas purge pipeline k is connected to the third gas purge pipeline inlet on the second pipeline b.

[0078] Furthermore, each gas purge pipeline is provided with a control valve for controlling the opening and closing of the gas purge pipeline, and the opening or closing of the purge pipeline is controlled by the control valve to achieve purge.

[0079] Wherein, a ninth control valve 12 is arranged on the first gas purge pipeline i, a tenth control valve 13 is arranged on the second gas purge pipeline j, and an eleventh control valve 14 is arranged on the third gas purge pipeline k.

[0080] Furthermore, the first gas purge pipeline inlet is located at a preset position between the fluidized bed reactor 3 and the fourth control valve 7; the second gas purge pipeline inlet is located at a preset position between the fluidized bed reactor 3 and the fifth control valve 8; the third gas purge pipeline inlet is located at a preset position between the fluidized bed reactor 3 and the second control valve 5. The preset positions can be adjusted by those skilled in the art according to actual needs, and the present invention does not limit this.

[0081] In this embodiment, by setting the first gas purge pipeline, the second gas purge pipeline, and the third gas purge pipeline in the system, it is possible to use clean gas to purge residual materials in the discharge pipeline (fourth pipeline), clean gas to purge residual gas in the exhaust pipeline (second pipeline, fifth pipeline), dry gas to purge the discharge tank, and dry gas to purge the transfer pipeline (eighth pipeline) and other steps to prevent the polymer remaining in the pipeline from melting and plasticizing.

[0082] In yet another embodiment of the present invention, the system further comprises:

[0083] A gas filter is arranged at the top of the discharge tank, and the third pipeline c is connected to the first exhaust port of the discharge tank 2 through the gas filter.

[0084] Furthermore, the sixth pipeline f is connected to the first air inlet of the discharge tank 2 through the gas filter. When the sixth pipeline f is connected to the first air inlet of the discharge tank 2 through the gas filter, when the discharge tank is inflated and pressurized through the sixth pipeline f, the circulating gas first passes through the gas filter and then enters the discharge tank, thereby realizing back-blowing of the gas filter during the pressurization process. In this case, the first air inlet and the first exhaust port are actually the same port.

[0085] In yet another embodiment of the present invention, a material level detection instrument, a temperature detection instrument and a pressure detection instrument are provided inside the discharge tank 2 so as to monitor the material level, temperature and pressure of the discharge tank 2 .

[0086] Furthermore, the system may also be provided with monitoring devices for detecting abnormal conditions, such as instrumentation equipment for detecting pressure, flow, temperature, liquid level, material level, container stress, valve position or regulator position, and corresponding automatic control systems.

[0087] In another embodiment of the present invention, the solid material discharged in a single discharging process generally fills at least 80% of the volume of the discharge tank 2. A solid monitoring device (such as a material level detection instrument) for detecting the material filling amount inside the container can be set in the discharge tank 2 to detect whether the solid material in the discharge tank reaches 80% of the volume of the discharge tank 2.

[0088] In another embodiment of the present invention, Figure 5 As shown, a method for discharging materials from a fluidized bed reactor is provided. The method is implemented based on the discharging system of the fluidized bed reactor in the above embodiment. The method specifically comprises the following steps:

[0089] Step S501: Control the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline, and the eighth pipeline to perform a closing operation.

[0090] Step S502: When the preset discharge conditions are met, the fourth pipeline and the fifth pipeline are controlled to be opened, so that the fluidized bed reactor discharges through the fourth pipeline and recovers the gas overflowing from the discharge tank during the discharge process through the fifth pipeline.

[0091] Step S503: After completing the discharging operation, the fourth pipeline and the fifth pipeline are controlled to perform a closing operation, and the first pipeline, the second pipeline and the third pipeline are controlled to perform an opening operation, so that the injection device receives the raw gas from the first gas source through the first pipeline, transports the raw gas to the fluidized bed reactor through the second pipeline, and pumps the discharge tank through the third pipeline to reduce the pressure of the discharge tank.

[0092] Step S504: After the pressure value of the discharge tank drops to the preset first pressure threshold, the third pipeline is controlled to perform a closing operation, and the seventh pipeline and the eighth pipeline are controlled to perform an opening operation, so that the conveying gas from the second gas source is input into the discharge tank through the seventh pipeline, and the material in the discharge tank is transferred to the downstream device through the eighth pipeline.

[0093] Step S505: After completing the material transfer, control the seventh pipeline and the eighth pipeline to perform a closing operation, control the sixth pipeline to perform an opening operation, pressurize the discharge tank through the sixth pipeline until the pressure value of the discharge tank reaches a preset second pressure threshold, and control the sixth pipeline to perform a closing operation to wait for the next discharge.

[0094] The first pressure threshold and the second pressure threshold are set by those skilled in the art according to actual needs, and the present invention does not limit this.

[0095] The first pressure threshold is preferably a value not greater than 1 MPag, more preferably a value not greater than 0.5 MPag, more preferably a value not greater than 0.1 MPag, and more preferably a value not greater than 0.01 MPag; the second pressure threshold is preferably a value not less than 0.6 MPag.

[0096] In another embodiment of the present invention, before step S502, the fluidized bed reactor discharge method further includes controlling the pressure value of the discharge tank within a preset pressure range, and controlling the pressure difference between the fluidized bed reactor and the discharge tank within a preset pressure difference range.

[0097] The pressure value of the discharge tank is adjusted to within a preset pressure range, and the pressure difference between the fluidized bed reactor and the discharge tank is adjusted to within a preset pressure difference range, so that the fluidized bed reactor can discharge into the discharge tank under the action of the pressure difference.

[0098] The pressure range and the pressure difference range are set by those skilled in the art according to actual needs, and the present invention does not limit this. The pressure range is preferably not less than 0.6 MPag.

[0099] The pressure difference range is preferably not greater than 1.5 MPa, more preferably not greater than 1.2 MPa, and even more preferably not greater than 1.0 MPa.

[0100] The fluidized bed reactor discharge method provided in this embodiment is realized based on the fluidized bed reactor discharge system provided in the above embodiment, greatly simplifies the discharge process, significantly improves the discharge rate of the fluidized bed in the process, reduces the use of control valves, and reduces the probability of failure. By introducing raw gas (high-pressure ethylene gas) into the injection device, the gas in the discharge tank is sucked to reduce the pressure of the discharge tank, and the pressure of the discharge tank can be reduced to below 0.01MPag after exhaust. It is operated under a slight positive pressure or negative pressure, and the low molecular weight compounds adsorbed in the polymer are flashed out to the greatest extent, and the amount of gas entering the rear system is reduced to a lower level. The remaining solid materials directly enter the downstream device (degassing bin) from the discharge tank, eliminating the transfer container in the original discharge system, reducing the path of low molecular weight compounds circulating in the system, avoiding the introduction of impurities, reducing raw material consumption, and reducing the devolatilization and recovery load of the rear system, which helps to improve product quality. In addition, a branch line (the sixth pipeline) is drawn from the circulating pipeline of the fluidized bed reactor, and the circulating gas is used to pressurize the discharge tank after the material is transferred, so as to reduce the pipeline oscillation in the subsequent suction process. At the same time, the circulating gas flow rate can be adjusted to form a sufficient pressure difference between the fluidized bed reactor and the discharge tank, allowing the fluidized bed to discharge at a high position, reducing the liquid content in the discharged material, and ensuring the high discharge efficiency and quality of the fluidized bed reactor in the gas phase polyethylene condensation process. The material discharged from the discharge tank has a lower liquid content, which can reduce the burden on the downstream device (degassing bin) and reduce energy consumption. After the material in the discharge tank is transferred to the downstream device, the discharge tank is pressurized by circulating gas, which improves the recycling value of the circulating gas, eliminates the transfer container and reduces the equipment cost, simplifies the operation process and reduces the operating cost, shortens the production cycle and also increases the production capacity per unit time, so that the overall economic benefits of the process are greatly improved.

[0101] In order to more clearly illustrate the advantages of the discharge system provided by the present invention compared with the discharge system in the prior art, a specific example is given below for illustration:

[0102] 1. Comparative Example (discharging using the existing discharging system and discharging method)

[0103] Taking a gas phase fluidized bed process device with an annual output of 300,000 tons of linear low-density polyethylene (LLDPE) as an example, the conventional single-peak LLDPE film product is produced, and the discharge is about 25 times per hour, the fluidized bed inlet temperature is about 49°C, and the discharge temperature is about 60-65°C. The discharge system is arranged on the single gas phase fluidized bed reaction system, and the single gas phase fluidized bed reaction system includes a circulating gas loop composed of a gas phase fluidized bed reactor, a circulating gas compressor, and a circulating gas condenser connected in sequence, and also includes a catalyst feeding system and various raw material feeding systems. From the lower part of the fluidized bed reactor to the upper part of the reactor, the concentration of the raw material gas decreases in sequence, a part of the raw material gas undergoes polymerization reaction in the lower part of the reactor, and the unreacted and fully polymerized particles continue to undergo polymerization reaction in the upper part of the gas phase fluidized bed reactor with the rising raw material gas flow, and part of the raw material gas that has not reacted is discharged from the top of the fluidized bed reactor and recycled together with the raw material gas to form a circulating gas loop, and the discharge port is arranged on the gas phase fluidized bed reactor. The discharge system and method provided by the patent with application date of September 10, 2007 and application number of CN200780037815.5 are adopted. The discharge system includes a sedimentation container and a transfer container. The feed port of the sedimentation container is connected to the discharge port of the single gas phase fluidized bed reactor, the bottom of the sedimentation container is connected to the feed port of the transfer container, the bottom of the transfer container is connected to the downstream degassing bin, and the top of the sedimentation container and the transfer container are both connected to the single gas phase fluidized bed reactor. The conventional fluidized bed reactor uses the position of 0.3m above the fluidized bed distribution plate at the bottom of the fluidized bed as the discharge port. When the polymerization reaction proceeds to a certain extent, the discharge system starts to discharge. However, since the fluidized bed reactor is bottom-fed, a lot of materials will be entrained without participating in the reaction during the process of discharging the powder from the bottom. The working pressure of the gas phase fluidized bed reactor is about 2.0 to 2.3MPag, the operating pressure of the sedimentation container is about 1.1 to 1.2MPa, and the operating pressure of the transfer container is about 0.5-0.6MPag. The gas content in each discharge is about 35wt% to 38wt% (mainly ethylene, hydrogen, nitrogen, etc.), and the dissolved liquid hydrocarbon (mainly comonomer and refrigerant) content is about 200 to 250kg / m 3 .

[0104] 2. Example 1 (discharging using the fluidized bed reactor discharge system and method provided by the present invention)

[0105] Taking a gas-phase fluidized bed process device with an annual output of 300,000 tons of linear low-density polyethylene (LLDPE) as an example, to produce conventional LLDPE film products, the bed temperature of the upper part of the fluidized bed reactor is about 88°C, the pressure is about 2.3MPag, the condensate is introduced into the lower part of the fluidized bed reactor, the condensate content is about 5wt%, the discharge is about 25 times per hour, the fluidized bed inlet temperature is about 49°C, and the discharge temperature is about 60-65°C. The discharge system is arranged on the side wall of the gas-phase fluidized bed reactor. The gas-phase fluidized bed reaction system includes a circulating gas loop composed of a gas-phase fluidized bed reactor, a circulating gas compressor, and a circulating gas condenser connected in sequence, and also includes a catalyst feeding system and various raw material feeding systems. The concentration of the raw gas decreases from the lower part to the upper part of the fluidized bed reactor. A part of the raw gas undergoes polymerization reaction in the lower part of the reactor, and the unreacted and completely polymerized particles continue to undergo polymerization reaction in the upper part of the gas phase fluidized bed reactor along with the rising raw gas flow. Some of the unreacted raw gas is discharged from the top of the fluidized bed reactor and recycled together with the raw gas to form a circulating gas loop. The discharge port is set on the gas phase fluidized bed reactor.

[0106] This example adopts the fluidized bed reactor discharge system provided by the present invention. The structure of the fluidized bed reactor discharge system is shown in Figure 1 , Figure 2 As described above, I will not go into details here.

[0107] Among them, the discharge tank operates intermittently, and the injection device operates continuously. The specific discharge method is:

[0108] (1) Control the third pipeline c, the fourth pipeline d, the fifth pipeline e, the sixth pipeline f, the seventh pipeline g, and the eighth pipeline h to perform a closing operation.

[0109] Specifically, the control valves on the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline, and the eighth pipeline are all closed, thereby controlling the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline, and the eighth pipeline to perform a closing operation.

[0110] (2) Confirm that the pressure of the discharge tank is within the preset pressure range, and the difference between the pressure of the fluidized bed reactor and the pressure of the discharge tank is within the preset pressure difference range. In this example, the pressure range is not less than 0.6 MPag. The preset pressure difference range is not more than 1.2 MPa.

[0111] (3) When the material level and bed weight reach the set value, the fourth pipeline and the fifth pipeline are controlled to perform the opening operation (specifically, this can be achieved by opening the fourth control valve and the fifth control valve). Under the action of gravity and pressure difference, the material is discharged from the fourth pipeline into the discharge tank. The average discharge flow rate is 37.5t / hr for LLDPE powder. When the material is no longer transferred from the fluidized bed reactor to the discharge tank, a balance is formed between the two, and the discharge is completed. At this time, the pressure of the discharge tank is about 2.3MPag. The solid material discharged in one discharge process is 80% of the volume of the discharge tank. The discharge time is generally less than 60s.

[0112] (4) Control the fourth pipeline and the fifth pipeline to perform a closing operation, and control the first pipeline a, the second pipeline b and the third pipeline to perform an opening operation (by closing the fourth control valve and the fifth control valve, and opening the first, second and third control valves), so that the injection device 1 receives the raw gas from the first gas source through the first pipeline a, and transports the raw gas to the fluidized bed reactor 3 through the second pipeline b, and the discharge tank is sucked, and the pressure of the discharge tank is further reduced to the first specified value, which is 0.25 MPag in this example. The gas separated by decompression enters the injection device through the third pipeline and is carried back to the fluidized bed reactor by the high-pressure raw gas.

[0113] In this example, the feed gas is ethylene feed gas of 5.0 MPag. The first gas source continuously inputs the feed gas to the injection device 1 so that the injection device operates continuously.

[0114] (5) After the suction is completed, the third pipeline is controlled to perform a closing operation, and the seventh and eighth pipelines are controlled to perform an opening operation (by closing the third control valve and opening the eighth and seventh control valves), and the material in the discharge tank is transferred to the downstream degassing bin by conveying gas. The conveying gas is the PDS conveying gas from the exhaust gas recovery system.

[0115] (6) After the transfer is completed, the seventh pipeline and the eighth pipeline are controlled to perform a closing operation, and the sixth pipeline is controlled to perform an opening operation (by closing the eighth control valve and the seventh control valve and opening the sixth control valve). The circulating gas from the circulating pipeline of the fluidized bed reactor is used to inflate and pressurize the discharge tank. At the same time, the first filter and the second filter above the discharge tank are back-blown to increase the pressure of the discharge tank to a second specified value. In this example, the second specified value is 1.15 MPag.

[0116] (7) After the pressure charging is completed, the sixth pipeline is controlled to perform a closing operation (achieved by closing the sixth control valve), and the discharge tank is restored to its initial state. At this point, one discharge process is completed and the next discharge is awaited.

[0117] After the above operation steps are adopted, the gas content in each discharge is about 18wt% (mainly ethylene, hydrogen, nitrogen, etc.), and the dissolved liquid hydrocarbon (mainly comonomer and refrigerant) content is about 180kg / m 3 .

[0118] 3. Example 2 (discharging using the fluidized bed reactor discharge system and method provided by the present invention)

[0119] Taking a gas-phase fluidized bed process device with an annual output of 300,000 tons of linear low-density polyethylene (LLDPE) as an example, to produce conventional LLDPE film products, the bed temperature of the upper part of the fluidized bed reactor is about 88°C, the pressure is about 2.3MPag, the condensate is introduced into the lower part of the fluidized bed reactor, the condensate content is about 5wt%, the discharge is about 25 times per hour, the fluidized bed inlet temperature is about 49°C, and the discharge temperature is about 60-65°C. The discharge system is arranged on the side wall of the gas-phase fluidized bed reactor, and the gas-phase fluidized bed reaction system includes a circulating gas loop composed of a gas-phase fluidized bed reactor, a circulating gas compressor, and a circulating gas cooler connected in sequence, and also includes a catalyst feeding system and various raw material feeding systems. The concentration of the raw gas decreases from the lower part to the upper part of the fluidized bed reactor. A part of the raw gas undergoes polymerization reaction in the lower part of the reactor, and the unreacted and completely polymerized particles continue to undergo polymerization reaction in the upper part of the gas phase fluidized bed reactor along with the rising raw gas flow. Some of the unreacted raw gas is discharged from the top of the fluidized bed reactor and recycled together with the raw gas to form a circulating gas loop. The discharge port is set on the gas phase fluidized bed reactor.

[0120] The discharge system of the fluidized bed reactor is the same as that of Example 1, see Figure 1 , Figure 2 As described above, I will not go into details here.

[0121] The specific discharge method of Example 2 is the same as that of Example 1. The difference between Example 2 and Example 1 is that the first specified value is set to 0.12MPag. After the above operation steps are adopted, the gas content in each discharge is about 6wt% (mainly ethylene, hydrogen, nitrogen, etc.), and the content of dissolved liquid hydrocarbons (mainly comonomers and refrigerants) is about 150kg / m 3 .

[0122] It can be found from Comparative Example 1, Example 1 and Example 2 that the use of the fluidized bed reactor discharge system and method provided by the present invention for discharge can significantly reduce the gas content and liquid content in the discharged material.

[0123] In another embodiment of the present invention, a computer program product is also provided. The computer program product includes a computer program or instructions. When the computer program or instructions are executed by a processor, all or part of the steps of the method in the above method embodiment are implemented. This embodiment will not be repeated here.

[0124] Further, the computer program product may include one or more computer executable components configured to execute the embodiments when the program is run; the computer program product may also include a computer program tangibly contained on a readable medium, the computer program including program code for executing any method in the embodiments of the present invention. In such an embodiment, the computer program may be downloaded and installed from a network through a communication part, and / or installed from a removable medium.

[0125] In another embodiment of the present invention, a computer-readable storage medium is provided. The computer program stored in the computer-readable storage medium, when executed by one or more processors, implements all or part of the steps of the method in the above method embodiment. This embodiment will not be repeated here.

[0126] In yet another embodiment of the present invention, an electronic device 600 is further provided. Figure 6 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the electronic device 600 includes: at least one processor 601, at least one communication bus 602, a user interface 603, at least one external communication interface 604, and a memory 605. Among them, the communication bus 602 is configured to realize the connection and communication between these components. Among them, the user interface 603 may include a display screen, and the external communication interface 604 may include a standard wired interface and a wireless interface. A computer program is stored in the memory 605, and the memory 605 and one or more processors 601 are connected to each other in communication. When the computer program is executed by one or more processors, the processor 601 is configured to execute the computer program stored in the memory to implement all or part of the steps of the method in the above method embodiment, and this embodiment will not be repeated here.

[0127] The fluidized bed reactor discharge system, method and electronic equipment provided by the present invention are provided with a multifunctional discharge tank, which has two functions of sedimentation and transfer, and is a dual-purpose tank, which combines the sedimentation container and the transfer container into one, greatly simplifies the discharge process, significantly improves the discharge rate of the fluidized bed in the process, reduces the use of the control valve, and reduces the probability of failure. The raw material gas (high-pressure ethylene gas) is introduced into the injection device, and the gas in the discharge tank is sucked to reduce the pressure of the discharge tank. After the discharge tank is exhausted, the pressure can be reduced to below 0.01MPag, and the discharge tank is operated under a slight positive pressure or negative pressure, so that the low molecular weight compounds adsorbed in the polymer are flashed out to the greatest extent, and the gas amount entering the rear system is reduced to a lower level. The remaining solid materials directly enter the downstream device (degassing bin) from the discharge tank, and the transfer container in the original discharge system is omitted, and the path of the low molecular weight compound circulating in the system is reduced, and the introduction of impurities is avoided, and the raw material consumption is reduced, and the devolatilization and recovery load of the rear system are reduced, which helps to improve the product quality. A branch line (sixth pipeline) is drawn out from the circulating pipeline of the fluidized bed reactor and connected to the first air inlet of the discharge tank. The circulating gas in the circulating pipeline of the fluidized bed reactor is used to pressurize the discharge tank after the material is transferred, so as to reduce the pipeline oscillation during the subsequent discharge process. At the same time, the circulating gas flow rate can be adjusted to form a sufficient pressure difference between the fluidized bed reactor and the discharge tank, allowing the fluidized bed to discharge at a high position, reducing the liquid content in the discharged material, and ensuring the high discharge efficiency and quality of the fluidized bed reactor in the gas phase polyethylene condensation process. The material discharged from the discharge tank has a lower liquid content, which can reduce the burden of the downstream device (degassing bin) and reduce energy consumption. After the material in the discharge tank is transferred to the downstream device, the discharge tank is pressurized by the circulating gas, which improves the recycling value of the circulating gas, eliminates the transfer container and reduces the equipment cost, simplifies the operation process and reduces the operating cost, shortens the production cycle and also increases the production capacity per unit time, so that the overall economic benefits of the process are greatly improved.

[0128] The various embodiments of the present invention are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0129] The protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. A fluidized bed reactor discharge system, characterized in that: The system comprises: An injection device is used to deliver raw gas to the fluidized bed reactor and perform a suction operation on the discharge tank; wherein the air inlet of the injection device is connected to the first gas source through a first pipeline, the exhaust port of the injection device is connected to the air inlet of the fluidized bed reactor through a second pipeline, and the ejection port of the injection device is connected to the first exhaust port of the discharge tank through a third pipeline; A discharge tank is used to receive materials discharged from the fluidized bed reactor and transfer the materials to a downstream device; wherein the feed port of the discharge tank is connected to the discharge port of the fluidized bed reactor through a fourth pipeline, the second exhaust port of the discharge tank is connected to the air inlet of the fluidized bed reactor through a fifth pipeline, the first air inlet of the discharge tank is connected to the circulation pipeline of the fluidized bed reactor through a sixth pipeline, the second air inlet of the discharge tank is connected to a second gas source through a seventh pipeline, and the discharge port of the discharge tank is connected to the downstream device through an eighth pipeline.

2. The fluidized bed reactor discharge system according to claim 1, characterized in that: Each pipeline is provided with a control valve for controlling the opening and closing of the pipeline; Among them, a first control valve is arranged on the first pipeline, a second control valve is arranged on the second pipeline, a third control valve is arranged on the third pipeline, a fourth control valve is arranged on the fourth pipeline, a fifth control valve is arranged on the fifth pipeline, a sixth control valve is arranged on the sixth pipeline, a seventh control valve is arranged on the seventh pipeline, and an eighth control valve is arranged on the eighth pipeline.

3. The fluidized bed reactor discharge system according to claim 2, characterized in that: The system further comprises: a first gas purge pipeline, wherein a gas outlet of the first gas purge pipeline is connected to a first gas purge pipeline inlet on the fourth pipeline; a second gas purge pipeline, wherein a gas outlet of the second gas purge pipeline is connected to a second gas purge pipeline inlet on the fifth pipeline; A third gas purge pipeline, wherein a gas outlet of the third gas purge pipeline is connected to a third gas purge pipeline inlet on the second pipeline.

4. The fluidized bed reactor discharge system according to claim 3, characterized in that: Each gas purge pipeline is provided with a control valve for controlling the opening and closing of the gas purge pipeline; Wherein, a ninth control valve is arranged on the first gas purge pipeline, a tenth control valve is arranged on the second gas purge pipeline, and an eleventh control valve is arranged on the third gas purge pipeline.

5. The fluidized bed reactor discharge system according to claim 3, characterized in that: The first gas purge pipeline inlet is located at a preset position between the fluidized bed reactor and the fourth control valve; The second gas purge pipeline inlet is located at a preset position between the fluidized bed reactor and the fifth control valve; The third gas purge line inlet is located at a preset position between the fluidized bed reactor and the second control valve.

6. The fluidized bed reactor discharge system according to claim 1, characterized in that: The system further comprises: A gas filter is arranged at the top of the discharge tank, and the third pipeline is connected to the first exhaust port of the discharge tank through the gas filter.

7. The fluidized bed reactor discharge system according to claim 6, characterized in that: The sixth pipeline is connected to the first gas inlet of the discharge tank through the gas filter.

8. A method for discharging a fluidized bed reactor, characterized in that: The method is implemented based on the system according to any one of claims 1 to 7, and the method comprises: Controlling the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline, and the eighth pipeline to perform a closing operation; When the preset discharge conditions are met, the fourth pipeline and the fifth pipeline are controlled to perform an opening operation, so that the fluidized bed reactor discharges through the fourth pipeline and recovers the gas overflowed from the discharge tank during the discharge process through the fifth pipeline; After the discharge operation is completed, the fourth pipeline and the fifth pipeline are controlled to perform a closing operation, and the first pipeline, the second pipeline and the third pipeline are controlled to perform an opening operation, so that the injection device receives the raw gas from the first gas source through the first pipeline, transports the raw gas to the fluidized bed reactor through the second pipeline, and sucks the discharge tank through the third pipeline to reduce the pressure of the discharge tank; After the pressure value of the discharge tank is reduced to a preset first pressure threshold, the third pipeline is controlled to perform a closing operation, and the seventh pipeline and the eighth pipeline are controlled to perform an opening operation, so that the conveying gas from the second gas source is input into the discharge tank through the seventh pipeline, so that the material in the discharge tank is transferred to the downstream device through the eighth pipeline; After completing the material transfer, the seventh pipeline and the eighth pipeline are controlled to perform a closing operation, and the sixth pipeline is controlled to perform an opening operation, the discharge tank is pressurized through the sixth pipeline until the pressure value of the discharge tank reaches a preset second pressure threshold, and the sixth pipeline is controlled to perform a closing operation to wait for the next discharge.

9. The method for discharging materials from a fluidized bed reactor according to claim 8, characterized in that: The preset first pressure threshold is not greater than 1 MPag; the second pressure threshold is not less than 0.6 MPag.

10. The method for discharging materials from a fluidized bed reactor according to claim 8, characterized in that: Before the fourth pipeline and the fifth pipeline are controlled to perform opening operations when the preset discharge condition is met, so that the fluidized bed reactor discharges through the fourth pipeline and recovers the gas overflowed from the discharge tank during the discharge process through the fifth pipeline, the method further includes: The pressure value of the discharge tank is controlled within a preset pressure range, and the pressure difference between the fluidized bed reactor and the discharge tank is controlled within a preset pressure difference range.

11. A computer-readable storage medium, characterized in that: The computer program stored in the computer-readable storage medium, when executed by one or more processors, implements the steps of the method according to any one of claims 8 to 10.

12. An electronic device, characterized in that: It comprises a memory and one or more processors, wherein the memory stores a computer program, and the memory and the one or more processors are communicatively connected with each other, and when the computer program is executed by the one or more processors, the steps of the method as claimed in any one of claims 8 to 10 are performed.

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