Sampling device for industrial recycling catalyst for preparing olefin through C4 cracking

Abstract

The utility model relates to a sampling device for an industrial recycle catalyst for preparing olefin by cracking C4, belonging to the technical field of preparing olefin by cracking C4. The sampling device is arranged on a catalyst conveying inclined tube between a C4 cracking reactor and a regenerator, and the catalyst conveying inclined tube is provided with a catalyst conveying slide valve for controlling the circulation amount of a catalyst; the sampling device consists of a first blanking valve, a second blanking valve and a catalyst circulating valve which are sequentially connected through pipelines, an inlet pipeline of the first blanking valve is connected with a catalyst conveying inclined pipe, and an outlet pipeline of the catalyst circulating valve is connected with the catalyst conveying inclined pipe; a third blanking valve is arranged between the second blanking valve and the catalyst circulating valve, and a sample receiving barrel is arranged below an outlet of the third blanking valve. According to the sampling device, a blowback and fluidizing medium is changed from steam to nitrogen, the phenomenon that a valve is blocked by a catalyst and mud is avoided, and a catalyst sample does not contain water; the catalyst continuously circulates, and sampling has timeliness and representativeness.

Description

Technical Field

[0001] The utility model belongs to the technical field of preparing olefins by cracking carbon four, and in particular relates to a sampling device for industrial circulating catalysts for preparing olefins by cracking carbon four. Background Art

[0002] While methanol produces ethylene and propylene under the action of catalyst, it also produces C4 components as a by-product, which is mainly composed of olefins. Since C4 containing high olefin components can also be catalytically cracked by methanol to olefins catalyst to produce ethylene and propylene, in order to maximize the production of ethylene and propylene, methanol to olefins and its by-product C4 are coupled to share a catalyst for catalytic cracking. The catalyst coke produced by the cracking of the two is burned in the regenerator through the main air.

[0003] When C4 enters the C4 cracking reactor, it is cracked to produce ethylene and propylene under the action of the catalyst. At the same time, part of it will be converted into coke and deposited on the catalyst. Too much coke will cause the catalyst to deactivate. Therefore, the coke on the catalyst needs to be burned by the main air to restore the activity of the catalyst. The catalyst is transported between the C4 cracking reactor and the regenerator through a transport inclined tube. The importance of controlling the coke content of the catalyst to improving the cracking of C4 is self-evident.

[0004] At present, the catalyst is taken offline and sent to the analysis and testing center for analysis and measurement of the carbon content of the catalyst. During the sampling process, the discharge valve is often stuck and the catalyst is water-carrying. The main problems are:

[0005] 1. Since the catalyst sampling, purging and conveying medium is steam, the steam cools down and reacts with the solid catalyst and mud, which are deposited in the valve channel of the discharge valve and cause blockage. Long-term operation makes it difficult to open the valve, and in severe cases, the valve breaks, making it impossible to take samples;

[0006] 2. Due to the condensation of steam during the catalyst sampling process, it inevitably enters the catalyst, causing the catalyst samples sent to the analysis and testing center to contain water, affecting the analysis and testing results;

[0007] 3. The sampling device has no catalyst circulation system, and the sampling is not real-time. At the same time, the catalyst discharge volume is large during the sampling process, and the catalyst falls on the frame platform, which increases the cleaning workload. Utility Model Content

[0008] In order to solve the problems of blockage and easy damage of feed valves, water content of catalysts and poor timeliness in the catalyst sampling process at the current stage, the utility model provides a sampling device for industrial circulating catalyst for carbon four cracking to olefins.

[0009] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0010] A sampling device for industrial circulating catalyst for C4 cracking to olefins is arranged on a catalyst delivery inclined pipe 3 between a C4 cracking reactor 1 and a regenerator 2, and a catalyst delivery slide valve 4 for controlling the catalyst circulation amount is arranged on the catalyst delivery inclined pipe 3; the sampling device consists of a first feed valve 5, a second feed valve 6 and a catalyst circulation valve 7 which are connected in sequence through pipelines, an inlet pipeline of the first feed valve 5 is connected to the catalyst delivery inclined pipe 3 and is located before the catalyst delivery slide valve 4, and an outlet pipeline of the catalyst circulation valve 7 is connected to the catalyst delivery inclined pipe 3 and is located after the catalyst delivery slide valve 4.

[0011] Furthermore, a third unloading valve 8 is provided between the second unloading valve 6 and the catalyst circulation valve 7, and a sample receiving barrel 12 is provided below the outlet of the third unloading valve 8;

[0012] Furthermore, a nitrogen backflush pipeline is connected to the inlet pipeline of the first discharge valve 5, and a flow limiting orifice 11 and a backflush nitrogen valve 9 are provided on the nitrogen backflush pipeline; the flow limiting orifice 11 is used to reduce the nitrogen flow rate;

[0013] Furthermore, a nitrogen delivery pipeline is connected to the pipeline between the first unloading valve 5 and the second unloading valve 6, and a nitrogen delivery valve 10 is provided on the nitrogen delivery pipeline.

[0014] Compared with the prior art, the advantages of the utility model are as follows:

[0015] 1. The backflush and fluidizing medium in the catalyst sampling device is changed from steam to nitrogen, so the catalyst will not become muddy and block the valve, and the catalyst sample does not contain water;

[0016] 2. Establish a catalyst sampling circulation system, the catalyst circulates continuously, and the sampling is timely and representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0018] Figure 1 : A schematic diagram of the structure of a sampling device for industrial circulating catalyst for producing olefins by cracking carbon four according to the utility model;

[0019] The names of the parts in the figure are: C4 cracking reactor 1, regenerator 2, catalyst delivery inclined pipe 3, catalyst delivery slide valve 4, first discharge valve 5, second discharge valve 6, catalyst circulation valve 7, third discharge valve 8, backflush nitrogen valve 9, nitrogen delivery valve 10, flow limiting orifice 11, sample receiving barrel 12. DETAILED DESCRIPTION

[0020] In order to clearly and completely describe the technical solution and its specific working process of the utility model, the specific implementation methods of the utility model are as follows in conjunction with the accompanying drawings of the specification:

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0024] Example 1

[0025] The following is a detailed description of the working of a sampling device for an industrial circulating catalyst for producing olefins by cracking of C4 provided in this embodiment, specifically: 30-40 t / h of raw C4 enters the C4 cracking reactor 1, the temperature of the C4 cracking reactor 1 is 500-550°C, and the pressure is 0.1-0.15 MPa; under the action of the normally fluidized methanol to olefins catalyst, the raw C4 is cracked to generate C4 cracking gas which is sent to the downstream for refining and purification, and the catalyst containing coke generated by the reaction enters the regenerator 2 through the catalyst delivery inclined pipe 3 and the catalyst delivery slide valve 4 under the action of pressure difference and dead weight to be charred, the temperature of the regenerator 2 is 650-700°C, and the pressure is 0.08-0.098 MPa, the charred main air enters the regenerator 2 to uniformly contact with the catalyst containing coke, completing the charring process, and the charred flue gas is sent to subsequent processes for treatment.

[0026] In the embodiment, in order to achieve the purpose of the invention, the catalyst delivery slide valve 4 adopts a slide valve with a hydraulic actuator, the first unloading valve 5, the second unloading valve 6, the catalyst circulation valve 7, the third unloading valve 8, the backwash nitrogen valve 9 and the delivery nitrogen valve 10 all adopt manual valves, and the flow limiting orifice 11 adopts a circular plate with a hole diameter of 2 mm.

[0027] The specific working steps of the sampling device for industrial circulating catalyst for carbon four cracking to olefins described in the utility model are as follows:

[0028] 1. Establish sampling catalyst system circulation

[0029] (1) Confirm that the first discharge valve 5, the second discharge valve 6, the catalyst circulation valve 7, and the third discharge valve 8 are in the closed state. During the sampling process, the catalyst delivery slide valve 4 is always in the open state;

[0030] (2) Open the nitrogen delivery valve 10;

[0031] (3) Open the second unloading valve 6 and the catalyst circulation valve 7 in sequence, and transport nitrogen gas into the regenerator 2 through the second unloading valve 6, the catalyst circulation valve 7 and the catalyst transport inclined pipe 3 in sequence, and use nitrogen to establish the transport process and complete the test flow;

[0032] (4) Open the backflush nitrogen valve 9 to backflush the catalyst in the inlet pipeline of the first discharge valve 5 into the delivery inclined pipe 3;

[0033] (5) After nitrogen purge for 10 min in the nitrogen backflush pipeline, close the nitrogen backflush valve 9;

[0034] (6) Slowly open the first discharge valve 5 to allow the catalyst to establish circulation.

[0035] 2. Sampling

[0036] (1) Slowly close the catalyst circulation valve 7 and the nitrogen delivery valve 10;

[0037] (2) Slowly open the third discharge valve 8, and the catalyst flows to the sample receiving barrel 12;

[0038] (3) After the sampling is completed, the third discharge valve 8 is closed, and the catalyst circulation valve 7 is quickly opened to allow the catalyst to circulate again in preparation for subsequent sampling.

[0039] The technical solution of the utility model is applied to solve the problems of the discharge valve being stuck during the valve opening process and the catalyst being water-carrying during the catalyst sampling process in the prior art.

[0040] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0041] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0043] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A sampling device for industrial circulating catalyst for C4 cracking to olefins, characterized in that: The sampling device is arranged on a catalyst delivery inclined pipe (3) between a C4 cracking reactor (1) and a regenerator (2), and a catalyst delivery slide valve (4) is arranged on the catalyst delivery inclined pipe (3); the sampling device is composed of a first discharge valve (5), a second discharge valve (6) and a catalyst circulation valve (7) which are connected in sequence through pipelines, the inlet pipeline of the first discharge valve (5) is connected to the catalyst delivery inclined pipe (3), and the outlet pipeline of the catalyst circulation valve (7) is connected to the catalyst delivery inclined pipe (3); a third discharge valve (8) is arranged between the second discharge valve (6) and the catalyst circulation valve (7), and a sample receiving bucket (12) is arranged below the outlet of the third discharge valve (8).

2. A sampling device for industrial circulating catalyst for C4 cracking to olefins as claimed in claim 1, characterized in that: A nitrogen backflush pipeline is connected to the inlet pipeline of the first discharge valve (5), and a flow limiting orifice plate (11) and a backflush nitrogen valve (9) are provided on the nitrogen backflush pipeline.

3. A sampling device for industrial circulating catalyst for C4 cracking to olefins as claimed in claim 1, characterized in that: A nitrogen delivery pipeline is connected to the pipeline between the first unloading valve (5) and the second unloading valve (6), and a nitrogen delivery valve (10) is arranged on the nitrogen delivery pipeline.

4. A sampling device for industrial circulating catalyst for C4 cracking to olefins as claimed in claim 1, characterized in that: The inlet pipeline of the first discharge valve (5) is connected to the catalyst delivery inclined pipe (3) and is located before the catalyst delivery slide valve (4), and the outlet pipeline of the catalyst circulation valve (7) is connected to the catalyst delivery inclined pipe (3) and is located after the catalyst delivery slide valve (4).

5. A sampling device for industrial circulating catalyst for C4 cracking to olefins as claimed in claim 1, characterized in that: The catalyst delivery slide valve (4) adopts a slide valve with a hydraulic actuator, and the first discharge valve (5), the second discharge valve (6), the catalyst circulation valve (7) and the third discharge valve (8) adopt hand valves.

6. A sampling device for industrial circulating catalyst for C4 cracking to olefins as claimed in claim 2, characterized in that: The back-blowing nitrogen valve (9) is a hand valve, and the flow limiting orifice plate (11) is a circular plate with a hole diameter of 2 mm.

7. A sampling device for industrial circulating catalyst for C4 cracking to olefins as claimed in claim 3, characterized in that: The nitrogen delivery valve (10) is a manual valve.

Images