CN215655083U

CN215655083U - Material leg material level measuring device and high-temperature Fischer-Tropsch synthesis reaction system

Info

Publication number: CN215655083U
Application number: CN202121772285.2U
Authority: CN
Inventors: 张建军; 杜宝胜; 时振振; 康则天; 张成瑞; 尹茂盈
Original assignee: Shaanxi Future Energy Chemical Co ltd
Current assignee: Shaanxi Future Energy Chemical Co ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-01-28
Anticipated expiration: 2031-07-30

Abstract

The utility model relates to the field of industrial measuring devices, and particularly provides a material level measuring device for a material leg and a high-temperature Fischer-Tropsch synthesis reaction system. The dipleg material level measuring device is sequentially provided with a plurality of process dipleg loosening air pipelines in the height direction of the dipleg, and a differential pressure transmitter is arranged between any two process dipleg loosening air pipelines. The problem of in order to test material height among the material leg among the ft synthesis fluidized bed reactor among the prior art, adopt gas thermal mass flow controller control instrument air blowing pipeline to blow, and gas thermal mass flow controller precision demand is higher, damages easily, and the maintenance frequency is high, and gets into mutual interference with the not hard up wind of technology material leg, influences the judgement to the material leg height is solved.

Description

Material leg material level measuring device and high-temperature Fischer-Tropsch synthesis reaction system

Technical Field

The utility model relates to the field of industrial measuring devices, and particularly provides a material level measuring device for a material leg and a high-temperature Fischer-Tropsch synthesis reaction system.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Fischer-tropsch synthesis, also known as fischer-tropsch synthesis, is a process in which synthesis gas (a mixture of carbon monoxide and hydrogen) is used as a raw material to synthesize liquid hydrocarbons or hydrocarbons in the presence of a catalyst under appropriate conditions. The core of the high temperature Fischer-Tropsch synthesis technology is a Fischer-Tropsch synthesis fluidized bed reactor, and hydrocarbon products mainly comprise high temperature condensate and low temperature condensate. Four cyclone separators are arranged in the Fischer-Tropsch synthesis fluidized bed reactor, and the change of the material level of a material leg (hereinafter referred to as the material level of the material leg) of each cyclone separator is used for judging the separation and recovery effect of the iron-based catalyst in real time.

As shown in fig. 1, in the prior art, the change of the position of the dipleg is measured by combining the process dipleg loosening wind and the instrument blowing wind pipe. The accumulated catalyst in the dipleg is swept by using loosening air, in addition, the dipleg is controlled by a gas thermal mass flow controller to be blown at constant flow for sweeping, and the differential pressure transmitter is swept by using an instrument blowing air pipeline, so that the catalyst is prevented from entering the differential pressure transmitter.

The inventor finds that the gas thermal mass flow controller is a high-precision instrument for a laboratory, the interlocking of an instrument blowing gas overpressure protection mass flow controller is also arranged for protecting the gas thermal mass flow controller in the prior art, the sensor is often damaged due to overpressure of an instrument blowing air pipeline or fine solid particles and water vapor in a blowing air medium entering a detection chamber of the instrument blowing air pipeline, the maintenance frequency and the maintenance cost are high, the stable measurement of the material level of a dipleg is influenced, meanwhile, the interference with the loose air of the dipleg is caused by the process, the poor air volume control can cause that the catalyst cannot smoothly whirlwind, sink and fall back in the dipleg to be fully recovered, a large amount of catalyst is brought into a rear system, and the judgment of the catalyst separation and recovery condition and the integral control of the reactor are directly influenced.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems that in the prior art, in order to test the height of materials in a dipleg in a Fischer-Tropsch synthesis fluidized bed reactor, a gas thermal mass flow controller is adopted to control an instrument blowing air pipeline to blow air, the gas thermal mass flow controller has high precision requirement, is easy to damage, has high maintenance frequency, interferes with the loose air of a process dipleg, and influences the judgment of the height of the dipleg.

In one or more embodiments of the utility model, a plurality of process dipleg loosening air pipelines are sequentially arranged in the height direction of the dipleg, and a differential pressure transmitter is arranged between any two process dipleg loosening air pipelines.

In one or more embodiments of the utility model, the high-temperature Fischer-Tropsch synthesis reaction system comprises a Fischer-Tropsch synthesis reactor, a material leg is arranged below the Fischer-Tropsch synthesis reactor, and the material leg comprises the material leg level measuring device.

One or some of the above technical solutions have the following advantages or beneficial effects:

1) the utility model omits an instrument blowing air pipeline in the prior art, avoids the problem of shutdown caused by easy damage to the gas thermal mass flow controller in the specific use process, and meets the requirement of industrial continuous production.

2) The utility model simplifies the measurement of the material level of the dipleg, realizes the successful combination of the technical dipleg loose wind and the instrument blowing wind material level measuring system, has small investment compared with the prior art, directly utilizes the technical loose wind to supply air for the differential pressure transmitter, has the characteristics of simple structure, maintenance free, stable operation and the like, and improves the recycling effect of the catalyst.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

Fig. 1 is a schematic view of a dipleg level measurement device in the prior art.

FIG. 2 is a schematic view of a dipleg level measurement device in an embodiment of the present application.

Wherein a is a process dipleg loose air duct; b is an instrument blowing air pipeline; 1. a Fischer-Tropsch synthesis reactor; 2, a dipleg; 3. an overflow valve; 4. an orifice plate flowmeter; 5. a process hand valve; 6. adjusting a valve; 7. a one-way valve; 8. a ball valve; 9. a differential pressure transmitter; 10. an instrument stop valve; 11. a second ball valve; 12. a pressure transmitter; 13. pneumatically cutting off the ball valve; a front stop valve; 15. a gas thermal mass flow controller; 16. and a rear stop valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

As seen from fig. 1, the prior art provides a dipleg level measurement device, wherein a is a process dipleg loose air duct; and b is an instrument blowing air pipeline, the process dipleg loose air pipeline is used for blowing the catalyst accumulated in the dipleg, and the instrument blowing air pipeline is used for protecting an instrument, namely a differential pressure transmitter 9.

The method specifically comprises the following processes:

the method comprises the steps that gas passes through a pneumatic cut-off ball valve 13, the opening degree of a gas thermal mass flow controller is set to be 15-30%, then a front cut-off valve 14 is slowly opened, then a rear cut-off valve 16 is slowly opened, the front cut-off valve and the rear cut-off valve are synchronously and fully opened finally, the gas enters a material leg 2 arranged in a Fischer-Tropsch synthesis reactor 1 through a one-way valve 7, 3 paths of blowing air corresponding to each material leg are required to be respectively used when the gas is normally put into use, 4 groups of the blowing air are totally 12, as shown in figure 1, firstly, the pressure difference between the indication of a pressure transmitter 12 and the pressure indication of the Fischer-Tropsch synthesis reactor is confirmed to be within the range of 0.25-0.85 MPa, the pneumatic cut-off ball valve 13 is interlocked and closed under the condition that the pressure difference is larger than 0.85MPa, the pressure difference is smaller than 0.25MPa, an alarm is given, the gas thermal mass flow controller 15 is damaged when the pressure difference is too high, catalyst is easily carried by process gas, and the gas thermal mass flow controller 15 can still be damaged. The two differential pressure transmitters 9 detect that differential pressure exists in the dipleg, and the material level height is obtained through conversion.

From the above process flow, in the whole process of obtaining the material level height in the dipleg 2, the pressure of the instrument blowing air pipeline needs to be strictly controlled to ensure that the gas thermal mass flow controller 15 normally operates, otherwise, the process cannot be normally performed if the gas thermal mass flow controller 15 is damaged.

On the other hand, the instrument air blowing pipeline finally blows air into the dipleg 2, and the air blowing is interfered with the air blowing of the process dipleg loose air pipeline, so that the catalyst blanking process in the dipleg 2 is influenced, and the reaction is influenced.

To this end, in one or some embodiments of the present invention, a dipleg level measurement device is provided, in which a plurality of process dipleg loosening air ducts are sequentially arranged in the height direction of the dipleg 2, and a differential pressure transmitter 9 is arranged between any two process dipleg loosening air ducts.

The utility model utilizes the principle of multi-channel equivalent measurement of material level, the differential pressure transmitters all take pressure on the process loosening air control pipelines corresponding to the dipleg, and the process flow (b) of blowing air of the originally designed instrument is correspondingly cancelled.

As shown in figure 2, the utility model simplifies the measurement of the material level of the dipleg, realizes the successful combination of the loose wind of the process dipleg and the blowing wind level measuring system of the instrument, compared with the design of the prior art, the dipleg material level measuring device has small investment, directly utilizes the loose wind of the process to supply air for the differential pressure transmitter 9, has the characteristics of simple structure, no maintenance, stable operation and the like, improves the recycling effect of the catalyst, reduces the whole cost of the dipleg material level measuring device of the original design by about 100 ten thousand yuan, reduces the one-time investment cost by about 96 ten thousand yuan compared with the design of the prior art, and provides reliable technical support for the design, the investment, the construction and the operation of the dipleg material level measuring device of the large-scale high temperature Fischer-Tropsch synthesis industrialization device.

In addition, the instrument blowing air pipeline in the prior art is omitted, the problem of shutdown caused by easy damage to the gas thermal mass flow controller in the specific use process is avoided, and the requirement of industrial continuous production is met.

Preferably, instrument stop valves 10 are arranged at the front and the rear of the differential pressure transmitter 9. The instrument stop valve 10 is used to protect the differential pressure transmitter 9 in an emergency, and also to adjust the air pressure on both sides of the differential pressure transmitter 9.

Preferably, the process dipleg loose air duct is provided with a perforated plate flowmeter 4. The normal flow of the orifice plate flowmeter 4 is 10-15Nm³Is between/h.

Preferably, a process hand valve 5 is arranged on the process dipleg loosening air pipeline and used for controlling the process loosening air pipeline to be opened and closed;

the front and the back of the process hand valve 5 are provided with adjusting valves 6.

Preferably, the connecting position of the pipeline where the differential pressure transmitter 9 is located and the process dipleg loosening air pipeline is a contact point, and a one-way valve 7 for blowing loosening air in one way to the dipleg 2 is arranged between the contact point and the dipleg 2.

Preferably, there is a ball valve 8 at the contact point.

Preferably, the other ends of the plurality of process dipleg loose air pipelines are converged to uniformly supply air.

In one or some embodiments of the utility model, a method for controlling a leg level measuring device is provided, comprising the steps of: the loosening air enters the dipleg 2 through the orifice plate flowmeter 4, the regulating valve 6, the process hand valve 5, the regulating valve 6 and the one-way valve 7, and when the dipleg is normally put into use, 3 paths of blowing air corresponding to each dipleg need to be respectively put into use, and the total of 4 groups is 12 paths.

In one or some embodiments of the utility model, the high-temperature Fischer-Tropsch synthesis reaction system comprises a Fischer-Tropsch synthesis reactor 1, a material leg 2 is arranged below the Fischer-Tropsch synthesis reactor 1, and the material leg 2 comprises the material leg level measuring device.

The dipleg 2 is typically a cyclone dipleg, which may be located inside or outside the high temperature bark synthesis reactor 1.

Preferably, an overflow valve 3 is arranged below the dipleg 2.

Preferably, a reactor is also connected below the dipleg 2.

In conclusion, the technological process of blowing air of the originally designed instrument is cancelled, the integration of the technological process of the material level measurement of the dipleg and the technological process of the loose air of the dipleg is realized, and the technological process of combining the material level measurement device with the technology of the loose air of the dipleg is finally formed.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims

1. A dipleg material level measuring device is characterized in that a plurality of process dipleg loose air pipelines are sequentially arranged in the height direction of a dipleg (2), and a differential pressure transmitter (9) is arranged between any two process dipleg loose air pipelines;

the connecting position of the pipeline where the differential pressure transmitter (9) is located and the process dipleg loosening air pipeline is a contact point, and a one-way valve (7) for blowing loosening air in one way towards the dipleg (2) is arranged between the contact point and the dipleg (2).

2. A dipleg level measurement device according to claim 1, characterized in that there are meter shut-off valves (10) before and after the differential pressure transmitter (9).

3. A dipleg level measurement device according to claim 1, characterised in that the process dipleg loose air duct is provided with a perforated plate flowmeter (4).

4. A dipleg level measurement device according to claim 1, characterized in that the process dipleg loose air duct is provided with a process hand valve (5) for controlling the process loose air duct to open and close;

the front and the back of the process hand valve (5) are provided with regulating valves (6).

5. A dipleg level measurement device according to claim 1, characterized in that there is a ball valve (8) at the contact point.

6. A dipleg level gauge as defined in claim 1 wherein the other ends of the plurality of process dipleg loosening air ducts converge to provide a uniform air supply.

7. A high temperature Fischer-Tropsch synthesis reaction system is characterized by comprising a Fischer-Tropsch synthesis reactor (1), wherein a material leg (2) is arranged below the Fischer-Tropsch synthesis reactor (1), and the material leg (2) comprises the material level measuring device of any one of claims 1 to 6.

8. A reaction system for the Fischer-Tropsch synthesis at a high temperature according to claim 7, in which there is an overflow valve (3) below the dipleg (2).

9. A high temperature Fischer-Tropsch synthesis reaction system according to claim 8, wherein a reactor is also connected below the dipleg (2).