CN210163382U - Conveying system for conveying catalyst to be reduced - Google Patents
Conveying system for conveying catalyst to be reduced Download PDFInfo
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- CN210163382U CN210163382U CN201920671173.4U CN201920671173U CN210163382U CN 210163382 U CN210163382 U CN 210163382U CN 201920671173 U CN201920671173 U CN 201920671173U CN 210163382 U CN210163382 U CN 210163382U
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Abstract
The utility model belongs to the technical field of the ft synthesis, a conveying system for carrying treat reduction catalyst is provided, include: the device comprises a catalyst receiving tank, a first material sending tank, a catalyst storage tank, a second material sending tank and a catalyst pressing tank; the feeding port of the first material sending tank is connected with the discharging port of the catalyst receiving tank, and the feeding port of the second material sending tank is connected with the discharging port of the catalyst storage tank; the first material sending tank is communicated with the catalyst storage tank through a first conveying pipeline, and the second material sending tank is communicated with the catalyst pressing tank through a second conveying pipeline; a first branch air pipeline is arranged between the first conveying pipeline and a first air supply pipeline arranged outside the first conveying pipeline; a second branch gas pipeline is arranged between the second conveying pipeline and a second gas supplementing pipeline arranged outside the second conveying pipeline; and the first branch gas pipeline and the second branch gas pipeline are respectively provided with a gas quantity adjusting device. The utility model discloses controllable, steady of gas velocity when can realizing catalyst transport has reduced the impact and the destruction to the catalyst among the transportation process.
Description
Technical Field
The utility model belongs to the technical field of the ft synthesis, especially, relate to a conveying system for carrying treat reduction catalyst.
Background
With the decreasing petroleum resources and the stricter requirements of human beings on the ecological protection, the world demand for clean liquid fuel is sharply increased, and in order to meet the demand, researchers in various countries are dedicated to research and development of clean fuel oil production technology, wherein the technology attracts attention by Fischer-Tropsch (Fischer-Tropsch) synthesis technology. The typical Fischer-Tropsch synthesis process flow is as follows: firstly, coal/natural gas is converted into synthesis gas through gasification or partial oxidation and reforming, then the synthesis gas is desulfurized, deoxidized and purified, and then the H/CO ratio is adjusted according to the adopted Fischer-Tropsch synthesis process conditions and catalysts, and then the synthesis gas enters a Fischer-Tropsch synthesis reactor to prepare mixed hydrocarbon. Finally, the synthetic product is separated, processed and modified to obtain different target products.
Fischer-Tropsch slurry bed synthesis is one of the key technical links of coal indirect liquefaction process. Fischer-tropsch slurry bed synthesis refers to a process in which synthesis gas is converted into hydrocarbons through a catalytic reaction, mainly involving reactions that produce alkanes and alkenes, accompanied by the production of oxygenates, the Water Gas Shift (WGS) reaction, and the like. The key point of the Fischer-Tropsch slurry bed synthesis technology is to develop a catalyst with high activity, high product selectivity and high stability. In the slurry bed fischer-tropsch synthesis process, no matter a cobalt-based catalyst or an iron-based catalyst is adopted, the prepared catalyst does not have the physical structure and chemical state required for catalyzing the synthesis reaction, and the catalyst is required to be further reduced to have certain physical and chemical properties and then has the activity of the catalyst. Generally, the catalyst needs to be reduced to a certain activity before being fed into the slurry bed reactor, or the catalyst is directly reduced by using a Fischer-Tropsch synthesis reactor. However, in any method, the catalyst is transferred from the lower container to the upper container and then to the reactor, or even from the low pressure container to the high pressure container and then to the reactor in order to ensure the uninterrupted operation of the apparatus. How to ensure that the conveying is smooth and the abrasion is reduced to the minimum in the catalyst particle conveying process is very important.
The pneumatic conveying technology is that air forms airflow in a closed pipeline at a certain speed, so that material is suspended in the pipeline and conveyed to another place by the airflow. The pneumatic transmission technology is divided into negative pressure pneumatic transmission, low positive pressure pneumatic transmission, positive pressure pneumatic transmission and the like. According to the principle of fluid mechanics, the flow of the air flow in the pipeline is subjected to the friction force of the pipe wall and the local resistance of the parts such as the elbow and the reducer pipe section, so that the pressure loss of the air flow is caused, the conveyed materials are settled due to insufficient kinetic energy on the parts such as the elbow of the pipeline and the longer horizontal pipe section, and the blockage of the pipeline is caused, so that the whole conveying system is stopped. Generally, to prevent clogging of the duct, the flow rate of the transport airflow is greatly increased to increase the airflow velocity. For example, chinese patent document CN102152972B discloses a positive pressure pneumatic conveying system and method, in which the system charges materials into a plurality of cabin pumps, then introduces compressed air into an air inlet pipeline, adjusts the pipeline pressure in the air inlet pipeline by adjusting a pressure regulating valve arranged on the air inlet pipeline, further adjusts the gas flow passing through the pipeline, and supplements the compressed air into the conveying pipeline to improve the conveying force of the system. Chinese patent document CN 103662837a discloses a dense phase conveying system for conveying powder to a reactor; the invention adopts two conveying systems, wherein each conveying system comprises a bin lock hopper and a bin for adding powder into the bin lock hopper, and the two bin lock hoppers are communicated with a reactor in parallel and used for alternately conveying the powder to the reactor in a dense phase manner; the method can realize continuous and stable powder conveying.
The existing positive pressure pneumatic conveying system is mainly used for conveying solid powdery substances, focuses on the abrasion of solid particles to a conveying pipeline, neglects the abrasion and damage of the conveyed particles, and is not suitable for conveying granular catalysts with higher requirements on the mechanical strength of the catalysts, such as catalysts used in a slurry bed. In the slurry bed Fischer-Tropsch synthesis process, the loss and abrasion of the catalyst exist not only in the slurry bed Fischer-Tropsch synthesis reactor, but also in the slurry bed Fischer-Tropsch catalyst reduction activation reactor and in the catalyst conveying process. That is, a part of the fischer-tropsch catalyst may be abraded to a very small particle size before entering the slurry bed fischer-tropsch synthesis reactor, and if the abrasion of the catalyst during the transportation process can be reduced to the maximum extent, the crushed unqualified catalyst particles can be effectively reduced from entering the slurry bed fischer-tropsch synthesis reactor, so that the proportion of the catalyst fine powder and/or dust existing in the fischer-tropsch synthesis slurry bed reactor can be obviously reduced. In fact, by adopting the prior art, the catalyst is easy to wear and damage the mechanical strength in the conveying process, the damage rate is increased, and then the Fischer-Tropsch synthesis reaction system is caused to block the filtering equipment due to the rapid crushing of the catalyst, so that the wax outlet system is frequently switched and reversely blown, the operation difficulty of the Fischer-Tropsch synthesis system is increased, and even the risk of parking is caused.
Therefore, designing a catalyst particle delivery system requires two points of attention: (1) the conveying inner wall needs to be clean and smooth; if the inner wall of the conveying pipeline is rough, the impact and friction between catalyst particles and the pipe wall are easily aggravated in the conveying process, and the catalyst breakage rate is increased; (2) the flow rate of the transport gas is stable and the flow rate of the gas stream is as low as possible while ensuring normal transport. In practical designs, to ensure proper transport of the catalyst particles, a gas stream must be used to transport the catalyst particles at a velocity greater than the suspension velocity of the material being transported, and the particles will become suspended and propelled by the gas stream. However, due to the collision, friction and adhesion between particles or between particles and the wall of the pipe, the influence of uneven air flow velocity and other factors in the pipeline, the actual air flow velocity is much higher than the material suspension velocity. However, when the velocity of the actual transport gas flow is too high, not only the energy consumption of the system is increased, but also the collision and friction between catalyst particles or between the catalyst particles and the tube wall are increased, and the catalyst strength is seriously damaged.
At present, the reduction process and the reduction device are key links for restricting the stable operation of the synthesis device, mainly the unreasonable catalyst conveying system, the high catalyst conveying gas speed and the uncontrollable flow rate lead to the serious damage of the catalyst, and further lead to the reduction of the activity of the catalyst, which leads to the reduction of the filtration efficiency of the Fischer-Tropsch synthesis reactor and seriously affects the stable operation of the synthesis reactor. In view of this, there is a great need to develop new devices and processes suitable for industrial applications.
Disclosure of Invention
An object of the utility model is to provide a to the problem that current conveying system exists, a conveying system for carrying treat reduction ft catalyst, this conveying system can realize that the gas velocity is controllable, steady when the catalyst is carried, has reduced the impact and the destruction to the catalyst in the transportation process.
In order to achieve the above object, the present invention provides a conveying system for conveying a catalyst to be reduced, comprising a catalyst receiving tank, a first material sending tank, a catalyst storage tank, a second material sending tank, and a catalyst pressing tank;
the feeding port of the first material sending tank is connected with the discharging port of the catalyst receiving tank through a pipeline, and the first material sending tank is used for receiving a catalyst to be reduced from the catalyst receiving tank; the feeding port of the second material sending tank is connected with the discharging port of the catalyst storage tank through a pipeline, and the second material sending tank is used for receiving the catalyst to be reduced from the catalyst storage tank;
the upper part and the lower part of the first material sending tank are both provided with a first conveying gas inlet; the upper part and the lower part of the second material sending tank are both provided with a second conveying gas inlet;
the discharge hole of the first material sending tank is communicated with the feed hole of the catalyst storage tank through a first conveying pipeline, and the catalyst storage tank is used for receiving the catalyst to be reduced from the first material sending tank and conveyed by the first conveying pipeline;
a first air supply pipeline for supplying conveying air to the first conveying pipeline is arranged outside the first conveying pipeline, and a first air branch pipeline for communicating the first conveying pipeline and the first air supply pipeline is arranged between the first conveying pipeline and the first air supply pipeline;
the discharge hole of the second material sending tank is communicated with the feed hole of the catalyst material pressing tank through a second conveying pipeline; the catalyst pressure tank is used for receiving the catalyst to be reduced from the second material sending tank and conveyed by the second conveying pipeline, and is also provided with a discharge hole used for being connected with the reduction reactor;
a second air supply pipeline for supplying conveying air to the second conveying pipeline is arranged outside the second conveying pipeline, and a second branch air pipeline for communicating the second conveying pipeline and the second air supply pipeline is arranged between the second conveying pipeline and the second air supply pipeline;
and the first and second branch gas pipelines are respectively provided with a gas quantity adjusting device for adjusting the gas flow of the conveying gas which is fed into the first and second conveying pipelines by the first and second gas supplementing pipelines.
The utility model discloses an among the conveying system, the required first second of sending material jar is carried gas, first tonifying qi pipeline and the required air supply of second tonifying qi pipeline to the required first transport gas of first sending material jar, second sending material jar, can share a gas supply source usually, also can set up gas supply source respectively alone. When one air supply source is shared, the delivery air is divided into the first dispensing tank, the second dispensing tank, the first air supply pipeline and the second air supply pipeline through an air supply main pipe.
According to the utility model provides a conveying system, preferably, the mode of arranging of first tonifying qi pipeline is: the conveying device is arranged in parallel along the conveying direction of the first conveying pipeline or spirally around the first conveying pipeline; the second air supply pipeline is arranged in the following mode: the conveying device is arranged in parallel along the conveying direction of the second conveying pipeline or spirally around the second conveying pipeline.
Preferably, the number of the first branch air pipelines and the second branch air pipelines is not less than 2.
According to the utility model provides a conveying system, preferably, the contained angle of the air current direction of giving vent to anger of first gas branch pipeline and first conveying pipeline's central line is greater than 0 and less than or equal to 90;
more preferably, the included angles between the outlet airflow direction of the first gas supplementing pipeline and the first branch air pipeline connecting interface and the outlet airflow direction of the first conveying pipeline and the first branch air pipeline connecting interface and the conveying direction of the catalyst in the first conveying pipeline are smaller than or equal to 90 degrees.
According to the utility model provides a conveying system, preferably, the contained angle of the air current direction of giving vent to anger of second branch gas pipeline and the central line of second conveying pipeline is greater than 0 and less than or equal to 90;
more preferably, the included angles between the outlet airflow direction of the second gas supplementing pipeline and the second branch gas pipeline connecting interface and the outlet airflow direction of the second conveying pipeline and the second branch gas pipeline connecting interface and the conveying direction of the catalyst in the second conveying pipeline are smaller than or equal to 90 degrees.
According to the utility model provides a conveying system, tolerance adjusting device includes: the gas quantity regulating part is positioned at the downstream of the pressure regulating valve on the first gas branch pipeline and the second gas branch pipeline and is used for regulating the gas flow passing through the gas quantity regulating part according to the post-valve pressure value of the pressure regulating valve. Those skilled in the art will appreciate that the gas flow regulating member may be a gas flow regulating device commonly used in the art, such as a shut-off nozzle, a gas inlet plate, or a gas flow meter. The pressure regulating valve may be selected from a pneumatic valve or an electric valve, preferably a PID pneumatic pressure regulating valve or a PID electric pressure regulating valve. The PID pressure regulating valve can automatically regulate the valve opening of the PID pressure regulating valve along with the pressure signal of the PID pressure regulating valve through a PID automatic control system.
According to the utility model provides a conveying system, preferably, all be equipped with pressure sensor on first gas pipeline and the second gas pipeline, just pressure sensor is located the low reaches of tolerance regulating part.
More preferably, the pressure sensors are respectively arranged at the communication position of the first branch gas pipeline and the first conveying pipeline and the communication position of the second branch gas pipeline and the second conveying pipeline.
In one example of the present invention, the second dispensing tank is provided with a material metering device, such as a weightlessness scale, for weighing the weight of the catalyst to be reduced received by the second dispensing tank from the catalyst storage tank; preferably, the material metering device is arranged at the upper part of the second material sending tank, and the catalyst material directly enters the second material sending tank after being metered.
According to the utility model provides a conveying system, preferably, conveying system still is equipped with the tonifying qi house steward that is used for supplying to carry gas, tonifying qi house steward carries gas entry, first tonifying qi pipeline and second tonifying qi pipeline to be linked together through communicating pipe with first transport gas entry, second respectively, and is equipped with the air supply switch of control gas circuit break-make on communicating pipe.
In a preferred embodiment of the present invention, the delivery pipe in the delivery system is selected from stainless steel materials or ceramic materials. The delivery conduits include, but are not limited to, a first delivery conduit, a second delivery conduit, a first gas supply conduit, a second gas supply conduit, a first gas branch conduit, and a second gas branch conduit.
The utility model discloses in, based on as above conveying process that conveying system goes on, including following step:
1) receiving a catalyst to be reduced in a catalyst receiving tank through a first material sending tank;
2) conveying gas is input into first conveying gas inlets at the upper part and the lower part of a first material sending tank, catalyst materials in the first material sending tank enter a first conveying pipeline under the action of the conveying gas and are input into a catalyst storage tank through the first conveying pipeline, and the gas-solid conveying speed is preferably controlled to be less than 4 m/s;
in the conveying process, when the pressure in the first conveying pipeline along the material conveying direction is reduced, conveying gas is supplemented into the first conveying pipeline through the first gas supplementing pipeline, and the flow of the conveying gas supplemented into the first conveying pipeline is adjusted through a gas quantity adjusting device on the first gas branch pipeline, so that the conveying gas quantity in the first conveying pipeline is constant;
3) stopping conveying the conveying gas after the catalysts in the first material sending tank are all conveyed to the catalyst storage tank;
4) receiving the catalyst material to be reduced in the catalyst storage tank through a second material sending tank; then conveying gas is input to second conveying gas inlets at the upper part and the lower part of a second material sending tank, the catalyst material in the second material sending tank enters a second conveying pipeline under the action of the conveying gas and is input into a catalyst material pressing tank through the second conveying pipeline, and the gas-solid conveying speed is preferably controlled to be less than 4 m/s;
in the conveying process, when the pressure in the second conveying pipeline along the material conveying direction is reduced, conveying gas is supplemented into the second conveying pipeline through a second gas supplementing pipeline, and the flow of the conveying gas supplemented into the second conveying pipeline is adjusted through a gas quantity adjusting device on a second branch gas pipeline, so that the conveying gas quantity in the second conveying pipeline is constant;
5) stopping conveying the conveying gas after the catalysts to be reduced in the second material sending tank are all conveyed to the catalyst pressing tank;
6) repeating the steps 1) -5) according to the amount of the catalyst to be reduced required by the reduction reactor until the amount of the catalyst in the catalyst pressing tank reaches the weight required by the reduction reaction; then pressing the catalyst material to be reduced in the catalyst pressing tank into the reduction reactor.
Wherein, the gas quantity regulating part can be a gas flowmeter; in the step 2) and the step 4, respectively adjusting the pressure regulating valve and the gas flowmeter according to the pressure value behind the valve, so that the pressure ratio in front of and behind the gas flowmeter is a set value; and when the set value is reached, the gas flow is constant.
The utility model discloses on pneumatic conveying system's pipeline, through setting up the tonifying qi pipeline, rather than the bronchus that is connected and set up the tolerance adjusting device on the bronchus and carry out the tonifying qi pressure boost, guarantee that the catalyst is steadily carried to high position ration by the low position, furthest has reduced the destruction to catalyst strength in the transportation process. The air supply and pressurization are realized by controlling the pressure regulating valve and the air quantity regulating part, the gas-solid flow in the conveying pipe and the pressure drop in the conveying pipe can be reasonably controlled, and the good flow state of the catalyst in the conveying process is ensured. Increase, let the catalyst move under the flow state that worsens with the tolerance atmospheric pressure in the pneumatic conveying pipeline once only, the utility model discloses greatly reduced the impact and the destruction to the catalyst among the transportation process.
The utility model discloses technical scheme's beneficial effect lies in: 1) the utility model can control the whole conveying process according to the conveying gas pressure input in the conveying system and the catalyst material amount to be conveyed by the system by additionally arranging the first air supply pipeline and the second air supply pipeline, so that the parameters of the system are matched with the conveying target; the gas-solid flow rate in the catalyst conveying process can be effectively controlled, so that the conveying is stable and controllable, the damage caused by the over-high conveying gas speed in the catalyst conveying process is reduced, and the method is suitable for practical industrial application; 2) in a preferred embodiment, the amount of the transport gas in the catalyst transport conduit is automatically adjusted by a PID regulator valve control in the gas amount adjusting device.
Drawings
FIG. 1 is a schematic view of a transfer system for transferring Fischer-Tropsch catalyst to be reduced according to the present invention.
The numbers in the above figures are illustrated as follows:
1-catalyst receiving tank, 2-first sending tank, 3-catalyst storage tank, 4-second sending tank, 5-catalyst pressure tank, 6-reduction reactor, S1-gas supplementing main pipe, S2-reducing gas inlet pipe, S3-first conveying pipeline, S3 ' -second conveying pipeline, S4-first gas supplementing pipeline, S4 ' -second gas supplementing pipeline, S5-first gas branch pipeline, S5 ' -second gas branch pipeline, S6-reducing high-temperature oil-gas pipe, and S7-reducing catalyst conveying pipe.
Detailed Description
In order that the technical features and contents of the present invention can be understood in detail, preferred embodiments of the present invention will be described in more detail. While the preferred embodiments of the present invention have been described in the examples, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
As shown in FIG. 1, in one embodiment of the present invention, a system for transporting Fischer-Tropsch catalyst to be reduced comprises: the system comprises a gas supply main pipe S1, a catalyst receiving tank 1, a first sending tank 2, a catalyst storage tank 3, a second sending tank 4 and a catalyst pressure tank 5;
the feeding port of the first material sending tank 2 is connected with the discharging port of the catalyst receiving tank 1 through a pipeline, and the first material sending tank 2 is used for receiving a catalyst to be reduced from the catalyst receiving tank 1; the feeding port of the second material sending tank 4 is connected with the discharging port of the catalyst storage tank 3 through a pipeline, and the second material sending tank 4 is used for receiving the catalyst to be reduced from the catalyst storage tank 3;
the upper part and the lower part of the first material sending tank 2 are both provided with a first conveying gas inlet; the upper part and the lower part of the second material sending tank 4 are both provided with a second conveying gas inlet;
the discharge port of the first sending tank 2 is communicated with the feed port of the catalyst storage tank 3 through a first conveying pipeline S3, and the catalyst storage tank 3 is used for receiving the catalyst to be reduced from the first sending tank and conveyed by the first conveying pipeline S3;
a first air supplement pipeline S4 used for supplementing conveying air into the first conveying pipeline is arranged outside the first conveying pipeline S3, and a first air branch pipeline S5 used for communicating the first conveying pipeline S3 and the first air supplement pipeline S4 is arranged between the first conveying pipeline S3526 and the first air supplement pipeline S4;
the discharge hole of the second material sending tank 4 is communicated with the feed hole of the catalyst material pressing tank 5 through a second conveying pipeline S3'; the catalyst pressure tank 5 is used for receiving the catalyst to be reduced from the second sending tank and conveyed by the second conveying pipeline S3', and the catalyst pressure tank 5 is also provided with a discharge hole for connecting with the reduction reactor 6;
a second air supplement pipeline S4 ' used for supplementing conveying air into the second conveying pipeline is arranged outside the second conveying pipeline S3 ', and a second branch air pipeline S5 ' used for communicating the second conveying pipeline S3 ' with the second air supplement pipeline S4 ' is arranged between the second conveying pipeline S4 ' and the second air supplement pipeline S4 ';
the first and second branch gas pipelines are respectively provided with a gas quantity adjusting device for adjusting the gas flow of the conveying gas which is fed into the first and second conveying pipelines by the first and second gas supplementing pipelines;
the air supply main pipe S1 is divided into a plurality of branches which are respectively communicated with a first conveying air inlet at the upper part and the lower part of the first material sending tank 2, a second conveying air inlet at the upper part and the lower part of the second material sending tank 4, a first air supply pipeline S4 and a second air supply pipeline S4', and an air supply switch for controlling the on-off of an air path is arranged on the communicating pipe. The transport gas is branched off to the first feed tank 2, the second feed tank 4 and the first gas supplementing pipeline S4 and the second gas supplementing pipeline S4' through a gas supplementing main S1. The number of the first branch air ducts S5 and the second branch air ducts S5' is preferably not less than 2.
In a preferred embodiment, the arrangement of the first make-up air duct S4 is as follows: the first conveying pipeline S3 is arranged in parallel along the conveying direction of the first conveying pipeline S3, or is spirally arranged around the first conveying pipeline S3; the second air supply pipeline S4' is arranged in the following mode: the second conveying pipeline S3 'is arranged in parallel along the conveying direction, or spirally arranged around the second conveying pipeline S3'.
In a preferred embodiment, the gas amount adjusting means includes: the gas quantity regulating part is positioned at the downstream of the pressure regulating valve on the first branch gas pipeline S5 and the second branch gas pipeline S5' and is used for regulating the gas flow passing through the gas quantity regulating part according to the pressure value after the valve of the pressure regulating valve. The pressure regulating valve is preferably selected from pneumatic or electric valves, for example PID pneumatic or electric pressure regulating valves (not shown in the figures); the gas quantity regulating part is preferably a gas flowmeter (not shown in the figure); and adjusting the gas flow passing through the gas flowmeter according to the pressure value after the valve of the PID pressure regulating valve. As can be understood by those skilled in the art, the PID pressure regulating valve can automatically regulate the valve opening degree of the PID pressure regulating valve along with the pressure signal of the PID pressure regulating valve through a PID automatic control system.
The outlet air flow directions of the first and second branch air pipes should be as close as possible to the flow directions of the feeding air flows of the first conveying pipe S3 and the second conveying pipe S3'. That is to say, the smaller the included angle between the outlet airflow direction of the first and second branch air ducts and the center line of the first conveying duct S3 and the second conveying duct S3' is, the better the included angle is, so that the pressure loss caused by the radial disturbance of the make-up air flow to the conveying air flow can be reduced. In the utility model, between the first material sending tank 2 and the catalyst storage tank 3, the included angle between the air flow direction of the air outlet of the first branch air pipeline S5 and the central line of the first conveying pipeline S3 is more than 0 degree and less than or equal to 90 degrees;
preferably, the included angles between the outlet airflow direction of the connection interface of the first gas supplementing pipeline S4 and the first branch air pipeline S5 and the outlet airflow direction of the connection interface of the first conveying pipeline S3 and the first branch air pipeline S5 and the conveying direction of the catalyst in the first conveying pipeline S3 are 15-90 degrees, and more preferably 60 degrees.
Between the second material sending tank 4 and the catalyst pressure tank 5, an included angle between the outlet airflow direction of the second branch air pipeline S5 'and the central line of the second conveying pipeline S3' is greater than 0 degree and less than or equal to 90 degrees;
preferably, the included angles between the outlet airflow direction of the connection interface of the second gas supplementing pipeline S4 ' and the second branch gas pipeline S5 ' and the outlet airflow direction of the connection interface of the second conveying pipeline S3 ' and the second branch gas pipeline S5 ' and the conveying direction of the catalyst in the second conveying pipeline S3 ' are both 15 to 90 degrees, and more preferably 60 degrees.
The air outlet calibers of the first and second branch air pipelines can be equal or unequal, and the number of the first and second branch air pipelines is not less than 2, which is determined according to the sizes of the first conveying pipeline S3 and the second conveying pipeline S3' in pneumatic conveying. The actual arrangement number and the gas outlet caliber of the first gas branch pipeline S5 and the first gas branch pipeline S5' are determined by calculation according to the conveying capacity of the catalyst, the scale of a conveying device (such as the diameters of the first conveying pipeline and the second conveying pipeline) and the flow rate of conveyed gas-solid, so that the gas-solid conveying is stable, and the abrasion loss of catalyst particles is minimum.
The utility model discloses in, set up first and second tonifying qi pipeline and finally play the effect of adjusting the gas flow in first and second pipeline. The setting of air-vent valve and air regulation piece for under the condition of the flow of the gas of input first and second tonifying qi pipeline for the definite value, the conveying gas flow in the catalyst conveying pipeline can be adjusted, thereby guarantee the flexibility of gas flow regulation in the system, strengthened conveying system's transportation stability and controllability, thereby reach the requirement of carrying the ft synthesis catalyst to gas flow.
Pressure sensors are arranged on the first branch gas pipeline S5 and the second branch gas pipeline S5', and the pressure sensors are positioned at the downstream of the gas quantity adjusting piece; the pressure sensors are preferably respectively arranged at the communication position of the first branch gas pipeline S5 and the first conveying pipeline S3 and the communication position of the second branch gas pipeline S5 'and the second conveying pipeline S3'. Through be in the low reaches of tolerance regulating part sets up pressure sensor, can monitor whether the pressure ratio of conveying gas through before and after the gas flowmeter is the setting value, and then guarantee that the conveying gas tolerance that tolerance regulating part passes through is invariable.
The gas flow in the whole pipeline can be adjusted in the conveying process by arranging the gas flow adjusting piece, so that the gas flow can be adjusted according to specific conveying conditions, and the whole system can reach a more ideal conveying state; this increases the catalyst transport capacity of the system for the same gas consumption. In addition, the gas amount adjusting member may be a gas flow meter for controlling the flow rate of gas, which is well known to those skilled in the art. The gas-solid flow rate at the ends of the first conveying pipeline S3 and the second conveying pipeline S3' can be controlled within 4m/S or less than 3m/S in other embodiments by adjusting the pressure regulating valves and the gas quantity regulating members arranged on the first branch gas pipeline and the second branch gas pipeline.
And a material metering device, such as a weightlessness scale, is arranged at the upper part of the second material sending tank 4 and is used for weighing the weight of the catalyst sent by the second material sending tank 4 each time in the catalyst reduction process. The feeding is stopped when the material metering device in the second canister 4 indicates that its weight measurement has reached the set minimum weight.
In order to reduce the damage to the catalyst during the transportation process, it is necessary to ensure that the inner walls of the transportation pipelines are clean and smooth, and the first transportation pipeline S3, the second transportation pipeline S3 ', the first gas supplementing pipeline S4, the second gas supplementing pipeline S4 ', the first gas branch pipeline S5 and the second gas branch pipeline S5 ' are all made of stainless steel materials, or in other embodiments, they may be made of ceramic materials.
The transport gas may be CO2、N2H used for reduction with an inert gas or a catalyst2CO or syngas (H)2+ CO). The gas source pressure of the conveying gas is 0.1-1.0 MPa, preferably 0.3-0.8 MPa.
In one example, a conveying process based on the conveying system shown in fig. 1 above includes the steps of:
1) the catalyst to be reduced is delivered into the catalyst receiving tank 1 by a tank truck or other containers; after the unloading is finished, opening an outlet valve at the bottom of the catalyst receiving tank 1, and receiving the catalyst to be reduced falling under the action of gravity in the catalyst receiving tank 1 through the first material sending tank 2;
2) inputting conveying gas to first conveying gas inlets at the upper part and the lower part of the first material sending tank 2; opening an air source switch at the upper part of the first sending tank 2, carrying out fluidization disturbance on the catalyst material of the first sending tank 2 by conveying gas (such as nitrogen), and pressurizing the catalyst receiving tank 1 and the first sending tank 2 to form certain pressure; when the discharge port valve of the first material sending tank 2 is opened, a pressure difference exists between the first material sending tank 2 and the first conveying pipeline S3, so that the materials can smoothly enter the first conveying pipeline S3 and the catalyst materials are conveyed into the catalyst storage tank 3 through the first conveying pipeline; simultaneously, an air source switch at the lower part of the first material sending tank 2 is opened, the speed of the material entering the first conveying pipeline S3 is increased by conveying air, and the conveying speed of the gas and the solid is controlled to be less than 4 m/S;
in the conveying process, when the pressure in the first conveying pipeline S3 along the material conveying direction is reduced, opening a PID pressure regulating valve and a gas flowmeter which are arranged on a first branch gas pipeline S5, and supplementing conveying gas into the first conveying pipeline S3 through a first gas supplementing pipeline S4; and the pressure ratio before and after the gas flowmeter is a set value through the pressure value behind the PID pressure regulating valve; when the set value is reached, the gas flow passing through the gas flowmeter is constant, so that the gas flow in the first conveying pipeline S3 is constant, and the gas-solid conveying is controlled to be stable;
3) after the catalyst in the first sending tank 2 is conveyed to the catalyst storage tank 3, closing the discharge port valves of the catalyst receiving tank 1 and the first sending tank 2, stopping conveying gas in the catalyst receiving tank and the first sending tank, and storing the catalyst material in the catalyst storage tank 3;
4) opening a discharge port valve at the bottom of the catalyst storage tank 3, and allowing the catalyst material to fall into a material metering device (such as a weightlessness scale) at the upper part of the second material sending tank 4 under the action of gravity, and weighing the weight of the catalyst conveyed each time; receiving a catalyst material to be reduced in the catalyst storage tank 3 through the second sending tank 4, and closing a valve at the bottom of the catalyst storage tank 3 when the weighing and metering of the material in the second sending tank 4 reach a set maximum weight;
then, conveying gas is input to second conveying gas inlets at the upper part and the lower part of the second material sending tank 4; opening an air source switch at the upper part of the second material sending tank 4, carrying out fluidization disturbance on the catalyst material in the second material sending tank 4 by conveying air, and pressurizing the second material sending tank 4 to form a certain pressure; when the discharge port valve of the second material sending tank 4 is opened, a pressure difference exists between the second material sending tank 4 and the second conveying pipeline S3 ', so that the materials can smoothly enter the second conveying pipeline S3 ' and are input into the catalyst pressure tank 5 through the second conveying pipeline S3 '; simultaneously, an air source switch at the lower part of the second material sending tank 4 is opened, the speed of the materials entering a second conveying pipeline S3' is increased by conveying air, and the conveying speed of the gas and the solid is controlled to be less than 4 m/S;
in the conveying process, when the pressure in the second conveying pipeline S3 'along the material conveying direction is reduced, the PID pressure regulating valve and the gas flowmeter arranged on the second branch gas pipeline S5' are opened, and conveying gas is supplemented into the second conveying pipeline S3 'through the second gas supplementing pipeline S4'; and the pressure ratio before and after the gas flowmeter is a set value through the pressure value behind the PID pressure regulating valve; when the set value is reached, the gas flow passing through the gas flowmeter is constant, so that the gas flow in the second conveying pipeline S3' is constant, and the gas-solid conveying is controlled to be stable;
5) when the weighing and metering of the materials in the second sending tank 4 reach the set minimum weight, stopping feeding, closing a valve at a discharge port of the second sending tank, and stopping conveying the conveying gas; the catalyst to be reduced in the second material sending tank 4 is conveyed to a catalyst pressure tank 5;
6) repeating the steps 1) -5) according to the amount of the catalyst to be reduced required by the reduction reactor 6 until the amount of the catalyst in the catalyst pressure tank 5 reaches the weight required by the reduction reaction; then the catalyst material to be reduced in the catalyst press tank 5 is pressed into the reduction reactor 6.
The transfer line between the second sending tank 4 and the catalyst pressure tank 5 is cut off to complete the separation therebetween. Can be selected to use H2、CO、CO2、N2Or slowly pressurizing the synthesis gas to the catalyst pressure tank 5 until the pressure difference between the synthesis gas and the pressure in the reduction reactor 6 reaches a set value, and then opening a valve on a pipeline between the catalyst pressure tank 5 and the reduction reactor 6 to press the catalyst to be reduced into the reduction reactor 6. When the pressure difference between the catalyst and the reduction reactor rapidly drops and reaches a minimum set value, a valve on a pipeline between the catalyst pressure tank 5 and the reduction reactor 6 is closedAnd a door. And (3) pressurizing the catalyst pressure tank 5 again until the difference between the pressure of the catalyst pressure tank 5 and the pressure in the reduction reactor 6 reaches a set value, opening a valve on a pipeline between the catalyst pressure tank 5 and the reduction reactor 6, purging the pipeline, repeating for 1-3 times, closing the valve, cutting off the pipeline between the catalyst pressure tank 5 and the reduction reactor 6, and preventing high-pressure substances in the reduction reactor 6 from being discharged into the catalyst pressure tank 5. Then the catalyst pressure tank 5 releases the pressure to the micro positive pressure, and waits for the next feeding of the reduction reactor 6.
In order to prevent the catalyst from flying to cause catalyst loss and environmental pollution, dust collectors such as bag type dust collectors are arranged above the catalyst receiving tank 1, the catalyst storage tank 3 and the catalyst pressure tank 5. And opening the bag type dust collector when the catalyst is conveyed.
The synthesis gas is fed to the reduction reactor 6 through a reducing gas inlet pipe S2 at a certain temperature and pressure. The catalyst to be reduced undergoes a catalyst reduction reaction in the reduction reactor 6 under the action of the synthesis gas. The high-temperature oil gas generated by the reduction reaction leaves the reduction reactor 6 through a reduction high-temperature oil gas pipe S6. After the high-temperature oil gas is subjected to heat exchange separation, all or part of gas-phase components and fresh H2Mixing with CO or synthetic gas with sulfur content less than 50ppb, circulating to reduction reactor 6, continuing to participate in catalyst reduction reaction, and further removing CO from the rest gas phase component2And then sent to a Fischer-Tropsch synthesis unit or recycled. The reduced catalyst slurry is pressure-fed to the Fischer-Tropsch synthesis unit through a reduced catalyst delivery pipe S7. The reaction heat generated in the reduction reaction is removed by a heat exchange system consisting of a steam drum and a heat exchanger in the reactor, and low-pressure steam is generated at the same time.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (11)
1. A delivery system for delivering a catalyst to be reduced, comprising: the device comprises a catalyst receiving tank (1), a first sending tank (2), a catalyst storage tank (3), a second sending tank (4) and a catalyst pressure tank (5);
the feeding port of the first material sending tank (2) is connected with the discharging port of the catalyst receiving tank (1) through a pipeline, and the first material sending tank (2) is used for receiving a catalyst to be reduced from the catalyst receiving tank (1); the feeding port of the second material sending tank (4) is connected with the discharging port of the catalyst storage tank (3) through a pipeline, and the second material sending tank (4) is used for receiving a catalyst to be reduced from the catalyst storage tank (3);
the upper part and the lower part of the first material sending tank (2) are provided with first conveying gas inlets; the upper part and the lower part of the second material sending tank (4) are provided with second conveying gas inlets;
the discharge port of the first sending tank (2) is communicated with the feed port of the catalyst storage tank (3) through a first conveying pipeline (S3), and the catalyst storage tank (3) is used for receiving the catalyst to be reduced from the first sending tank and conveyed by the first conveying pipeline (S3);
a first air supplement pipeline (S4) used for supplementing conveying air into the first conveying pipeline is arranged outside the first conveying pipeline (S3), and a first air branch pipeline (S5) used for communicating the first conveying pipeline (S3) and the first air supplement pipeline (S4) is arranged between the first conveying pipeline (S3) and the first air supplement pipeline (S4);
the discharge hole of the second material sending tank (4) is communicated with the feed hole of the catalyst pressing tank (5) through a second conveying pipeline (S3'); the catalyst pressure tank (5) is used for receiving the catalyst to be reduced from the second sending tank and conveyed by the second conveying pipeline (S3'), and the catalyst pressure tank (5) is also provided with a discharge hole for connecting the reduction reactor (6);
a second air supplement pipeline (S4 ') used for supplementing conveying air into the second conveying pipeline is arranged outside the second conveying pipeline (S3 '), and a second branch air pipeline (S5 ') used for communicating the second conveying pipeline (S3 ') and the second air supplement pipeline (S4 ') is arranged between the second conveying pipeline (S3 ') and the second air supplement pipeline (S4 ');
and the first and second branch gas pipelines are respectively provided with a gas quantity adjusting device for adjusting the gas flow of the conveying gas which is fed into the first and second conveying pipelines by the first and second gas supplementing pipelines.
2. The delivery system according to claim 1, wherein the first make-up air duct (S4) is arranged in such a way that: the conveying pipes are arranged in parallel along the conveying direction of the first conveying pipeline (S3), or are spirally arranged around the first conveying pipeline (S3); the second air supply pipeline (S4') is arranged in the following way: are arranged in parallel along the feeding direction of the second conveying pipeline (S3 '), or are spirally arranged around the second conveying pipeline (S3').
3. The conveying system according to claim 1, wherein the number of the first branch gas ducts (S5) and the second branch gas ducts (S5') is not less than 2.
4. The conveying system according to claim 1, wherein the angle between the outlet air flow direction of the first branch air duct (S5) and the center line of the first conveying duct (S3) is greater than 0 ° and equal to or less than 90 °.
5. The conveying system according to claim 4, wherein the outlet gas flow direction of the connection interface of the first gas supply pipeline (S4) and the first branch gas pipeline (S5) and the outlet gas flow direction of the connection interface of the first conveying pipeline (S3) and the first branch gas pipeline (S5) respectively form an included angle of 90 ° or less with the conveying direction of the catalyst in the first conveying pipeline (S3).
6. The conveying system according to claim 1, wherein the angle between the outlet airflow direction of the second branch air duct (S5 ') and the center line of the second conveying duct (S3') is greater than 0 ° and equal to or less than 90 °.
7. The conveying system according to claim 6, wherein the outlet gas flow direction of the connection interface of the second gas supply pipeline (S4 ') and the second branch gas pipeline (S5 ') and the outlet gas flow direction of the connection interface of the second conveying pipeline (S3 ') and the second branch gas pipeline (S5 ') respectively form an included angle of 90 ° or less with the conveying direction of the catalyst in the second conveying pipeline (S3 ').
8. The conveying system according to claim 1, wherein the gas amount adjusting means includes: the gas quantity regulating part is positioned at the downstream of the pressure regulating valve on the first branch gas pipeline (S5) and the second branch gas pipeline (S5') and is used for regulating the gas flow passing through the gas quantity regulating part according to the post-valve pressure value of the pressure regulating valve.
9. The delivery system of claim 8, wherein said pressure regulating valve is a PID pneumatic or electrical pressure regulating valve.
10. The conveying system according to claim 8, wherein the first branch gas pipeline (S5) and the second branch gas pipeline (S5') are provided with pressure sensors respectively, and the pressure sensors are positioned at the downstream of the gas quantity adjusting part;
the pressure sensors are respectively arranged at the communication position of the first branch gas pipeline (S5) and the first conveying pipeline (S3) and the communication position of the second branch gas pipeline (S5 ') and the second conveying pipeline (S3').
11. A conveying system according to any one of claims 1-9, characterized in that the second dispensing pot (4) is provided with a material metering device for weighing the catalyst to be reduced received by the second dispensing pot from the catalyst storage pot.
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