阅读说明：本技术 内浮顶储罐安全保护控制系统及其操作方法 (Safety protection control system for internal floating roof storage tank and operation method thereof ) 是由 郝毅 于 2019-12-20 设计创作，主要内容包括：本发明属于化工工艺领域,具体涉及一种内浮顶储罐安全保护控制系统及其操作方法,包括储罐、付料管线、付料切断阀、若干浮筒、浮盘、第一雷达液位计、第二雷达液位计、第一雷达反射板及第二雷达反射板；所述储罐底部连接付料管线,付料管线上设置付料切断阀,储罐内部放置若干浮筒,若干浮筒上部安装浮盘,浮盘上部两侧安装第一雷达反射板及第二雷达反射板；储罐顶部两侧分别安装第一雷达液位计、第二雷达液位计；所述第一雷达反射板位于第一雷达液位计正下方,所述第二雷达反射板位于第二雷达液位计正下方。其通过监控储罐内浮盘两端的高度,当浮盘发生沉盘时,能及时停止收付料作业,保证储罐及人员的安全。(The invention belongs to the field of chemical processes, and particularly relates to a safety protection control system of an inner floating roof storage tank and an operation method thereof, wherein the safety protection control system comprises a storage tank, a material discharge pipeline, a material discharge cut-off valve, a plurality of floating drums, a floating disc, a first radar liquid level meter, a second radar liquid level meter, a first radar reflecting plate and a second radar reflecting plate; the bottom of the storage tank is connected with a material auxiliary pipeline, a material auxiliary cut-off valve is arranged on the material auxiliary pipeline, a plurality of floating cylinders are arranged in the storage tank, floating discs are arranged on the upper portions of the plurality of floating cylinders, and a first radar reflecting plate and a second radar reflecting plate are arranged on two sides of the upper portion of each floating disc; a first radar liquid level meter and a second radar liquid level meter are respectively arranged on two sides of the top of the storage tank; the first radar reflecting plate is located under the first radar liquid level meter, and the second radar reflecting plate is located under the second radar liquid level meter. The height of the two ends of the floating disc in the storage tank is monitored, and when the floating disc sinks, the material receiving and paying operation can be stopped in time, so that the safety of the storage tank and personnel is ensured.)

1. Interior floating roof storage tank safety protection control system, its characterized in that: the device comprises a storage tank, a material discharge pipeline, a material discharge cut-off valve, a plurality of buoys, a floating disc, a first radar liquid level meter, a second radar liquid level meter, a first radar reflecting plate and a second radar reflecting plate; the bottom of the storage tank is connected with a material auxiliary pipeline, a material auxiliary cut-off valve is arranged on the material auxiliary pipeline, a plurality of floating cylinders are arranged in the storage tank, floating discs are arranged on the upper portions of the plurality of floating cylinders, and a first radar reflecting plate and a second radar reflecting plate are arranged on two sides of the upper portion of each floating disc; a first radar liquid level meter and a second radar liquid level meter are respectively arranged on two sides of the top of the storage tank; the first radar reflecting plate is located under the first radar liquid level meter, and the second radar reflecting plate is located under the second radar liquid level meter.

2. The internal floating roof tank safety protection control system of claim 1, wherein: and the upper part of the floating disc is also provided with a third radar reflecting plate and a fourth radar reflecting plate, the connecting line of the positions of the third radar reflecting plate and the fourth radar reflecting plate is vertical to the connecting line between the first radar reflecting plate and the second radar reflecting plate, and a third radar liquid level meter and a fourth radar liquid level meter are arranged at the top of the storage tank above the third radar reflecting plate and the fourth radar reflecting plate.

3. The internal floating roof tank safety protection control system of claim 1, wherein: the plurality of buoys comprise a first side buoy, a second side buoy and a middle buoy which are linearly arranged.

4. The internal floating roof tank safety protection control system of claim 3, wherein: the bottom of the floating plate is uniformly distributed with peripheral buoys except other positions connected with the first side buoy, the second side buoy and the middle buoy.

5. The internal floating roof tank safety protection control system of claim 4, wherein: first side portion flotation pontoon, second side portion flotation pontoon, middle part flotation pontoon, peripheral flotation pontoon all use the bolt fastening below the floating plate, and the flotation pontoon is cylindrical, and the centre is airtight space.

6. The internal floating roof tank safety protection control system of claim 1, wherein: the auxiliary material cut-off valve is an electromagnetic valve.

7. The operation method of the safety protection control system of the inner floating roof storage tank is characterized in that: a material discharge cut-off valve is arranged on a material discharge pipeline connected with the bottom of the storage tank; a plurality of floating cylinders are linearly arranged in the storage tank, floating plates are arranged at the upper parts of the plurality of floating cylinders, and a first radar reflecting plate and a second radar reflecting plate are arranged at two corresponding ends of the outer edge of the upper part of each floating plate; a first radar liquid level meter and a second radar liquid level meter are respectively installed on two sides of the top of the storage tank, a first radar reflecting plate is located under the first radar liquid level meter, and a second radar reflecting plate is located under the second radar liquid level meter; and when the height difference of the two ends of the floating disc measured by the first radar liquid level meter and the second radar liquid level meter exceeds a set limit value, judging that the floating disc part sinks, and closing the material-paying cut-off valve.

8. The method of operating an internal floating roof tank safety protection control system of claim 7, wherein: when the height difference of the two ends of the floating disc measured by the first radar liquid level meter and the second radar liquid level meter exceeds a set limit value, the first radar liquid level meter and the second radar liquid level meter send signals to a remote instrument control system, the remote instrument control system sends signals to a material paying cut-off valve, and the material paying operation is immediately closed.

9. The method of operating an internal floating roof tank safety protection control system of claim 8, wherein: the diameters of the plurality of buoys are the same, and the set limit value is the diameter of the buoys.

10. The method of operating an internal floating roof tank safety protection control system of claim 9, wherein: the set limit value is 200 mm.

Technical Field

The invention belongs to the field of chemical processes, and particularly relates to a safety protection control system for an internal floating roof storage tank and an operation method thereof.

Background

In order to reduce the oil gas volatilization of the light oil product and reduce the pollution of the oil gas volatilization to the atmospheric environment. The petrochemical industry often uses an inner floating roof storage tank to store light oil products. The floating disc in the storage tank floats on the liquid level of the oil product under the influence of the buoyancy of the floating cylinder. In the production process, floating damage is caused to enter oil under the influence of factors such as the flow rate of oil products of the materials received by the storage tank, the service life of the floating drum and the like, so that the buoyancy is reduced, and part of the floating disc sinks into the oil products. Part of floating disc components in oil products can be in a financial machine pump along with an oil supply pipeline of a storage tank, so that the machine pump is subjected to cavitation erosion and evacuation, and fire and explosion can happen in severe cases. Safety accidents occur, personnel injury is caused, and economic loss is brought to enterprises.

Disclosure of Invention

In view of the defects in the prior art, the invention provides a safety protection control system for an inner floating roof storage tank and an operation method thereof.

In order to achieve the purpose, the invention adopts the technical scheme that the safety protection control system of the inner floating roof storage tank comprises a storage tank, a material auxiliary pipeline, a material auxiliary cut-off valve, a plurality of buoys, a floating disc, a first radar liquid level meter, a second radar liquid level meter, a first radar reflecting plate and a second radar reflecting plate; the bottom of the storage tank is connected with a material auxiliary pipeline, a material auxiliary cut-off valve is arranged on the material auxiliary pipeline, a plurality of floating cylinders are arranged in the storage tank, floating discs are arranged on the upper portions of the plurality of floating cylinders, and a first radar reflecting plate and a second radar reflecting plate are arranged on two sides of the upper portion of each floating disc; a first radar liquid level meter and a second radar liquid level meter are respectively arranged on two sides of the top of the storage tank; the first radar reflecting plate is located under the first radar liquid level meter, and the second radar reflecting plate is located under the second radar liquid level meter.

Based on the technical scheme, the distribution mode of the plurality of buoys below the floating disc is not limited, and the floating disc can be floated by a sufficient number of buoys.

Preferably, the plurality of buoys include first side buoys, second side buoys and middle buoys that are placed in a straight line.

Preferably, the bottom of the floating plate is uniformly distributed with peripheral buoys except other positions connected with the first side buoy, the second side buoy and the middle buoy.

Furthermore, a third radar reflecting plate and a fourth radar reflecting plate are further mounted on the upper portion of the floating plate, a connecting line of positions of the third radar reflecting plate and the fourth radar reflecting plate is perpendicular to a connecting line between the first radar reflecting plate and the second radar reflecting plate, and a third radar liquid level meter and a fourth radar liquid level meter are arranged on the tops of the storage tanks above the third radar reflecting plate and the fourth radar reflecting plate.

Furthermore, the bottom of the floating plate is uniformly distributed with peripheral buoys except other positions connected with the first side buoy, the second side buoy and the middle buoy.

Based on the technical scheme, the number of the peripheral buoys is determined under the condition that the floating disc can float.

Further, first side portion flotation pontoon, second side portion flotation pontoon, middle part flotation pontoon, peripheral flotation pontoon all use the bolt fastening below the floating plate, and the flotation pontoon is cylindrical, and the centre is airtight space.

Preferably, the auxiliary material cut-off valve is an electromagnetic valve.

Further, the distance between the middle pontoon and the first side pontoon is equal to the distance between the middle pontoon and the second side pontoon.

Further, the system also comprises a PLC device, wherein the first radar liquid level meter and the second radar liquid level meter are connected to the PLC device, and the PLC device is connected to the auxiliary material cut-off valve.

On the other hand, the technical scheme of the invention comprises that the operating method of the safety protection control system of the internal floating roof storage tank is characterized in that a material auxiliary cut-off valve is arranged on a material auxiliary pipeline connected with the bottom of the storage tank; a plurality of floating cylinders are linearly arranged in the storage tank, floating plates are arranged at the upper parts of the plurality of floating cylinders, and a first radar reflecting plate and a second radar reflecting plate are arranged at two corresponding ends of the outer edge of the upper part of each floating plate; a first radar liquid level meter and a second radar liquid level meter are respectively installed on two sides of the top of the storage tank, a first radar reflecting plate is located under the first radar liquid level meter, and a second radar reflecting plate is located under the second radar liquid level meter; and when the height difference of the two ends of the floating disc measured by the first radar liquid level meter and the second radar liquid level meter exceeds a set limit value, judging that the floating disc part sinks, and closing the material-paying cut-off valve.

The technical scheme is further improved, when the height difference of the two ends of the floating disc measured by the first radar liquid level meter and the second radar liquid level meter exceeds a set limit value, the first radar liquid level meter and the second radar liquid level meter send signals to a remote instrument control system, the remote instrument control system sends signals to the material discharge stop valve, and the material discharge operation is immediately closed.

Further, the diameters of a plurality of buoys are the same, and the set limit value is the diameter of the buoys.

Preferably, the set limit value is 200 mm.

According to the other technical scheme, a third radar reflecting plate and a fourth radar reflecting plate are further mounted on the upper portion of the floating plate, a connecting line of positions of the third radar reflecting plate and the fourth radar reflecting plate is perpendicular to a connecting line between the first radar reflecting plate and the second radar reflecting plate, and a third radar liquid level meter and a fourth radar liquid level meter are arranged on the tops of the storage tanks above the third radar reflecting plate and the fourth radar reflecting plate.

And when the height difference of two ends of the floating disc measured by the first radar liquid level meter, the second radar liquid level meter, the third radar liquid level meter and the fourth radar liquid level meter exceeds a set limit value, judging that the floating disc part sinks, and closing the material discharge cut-off valve.

The technical scheme is further improved, when the height difference of two ends of a floating disc measured by the first radar liquid level meter, the second radar liquid level meter, the third radar liquid level meter and the fourth radar liquid level meter exceeds a set limit value, the first radar liquid level meter, the second radar liquid level meter, the third radar liquid level meter and the fourth radar liquid level meter send signals to a remote instrument control system (PLC device), the remote instrument control system sends signals to a material discharge stop valve, and material discharge operation is immediately stopped to overhaul a storage tank. The floating disc assembly is prevented from entering the pump, safety accidents are avoided, and the safety of personnel and equipment is ensured.

Based on above-mentioned technical scheme, the flotation pontoon height is 200mm, normal operating condition, the floating plate floats at the oil level, first radar level gauge, the second radar level gauge, the difference of arbitrary two wherein of third radar level gauge and fourth radar level gauge can be within 200mm, if one or more flotation pontoon leak, the buoyancy of flotation pontoon one side is not enough to support the floating plate, the floating plate slope, cause the floating plate slope one side to sink promptly, take place to sink the dish, first radar level gauge, the second radar level gauge, the difference of two wherein of third radar level gauge and fourth radar level gauge can exceed 200mm, close the pay material trip valve.

The working process of the invention is as follows: the radar transmitting plates are installed at two ends corresponding to the outer edges of the floating plate, the height of two sides of the floating plate is monitored through a radar liquid level meter on the top of the tank, when the height of two ends of the floating plate exceeds a limit value, the floating plate can be judged to partially sink, the auxiliary material operation is immediately closed through a remote instrument control system, and the storage tank is overhauled.

The invention has the beneficial effects that: the floating disc assembly is prevented from entering the pump, safety accidents are avoided, and the safety of personnel and equipment is ensured.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of the float;

FIG. 3 is a schematic view of embodiment 2;

in the figure: 1. storage tank, 2, pay material pipeline, 3, pay material trip valve, 4, first side flotation pontoon, 5, second side flotation pontoon, 6, middle flotation pontoon, 7, floating plate, 8, first radar level gauge, 9, second radar level gauge, 10, first radar reflecting plate, 11, second radar reflection, 12, long-range instrument control system, 13, peripheral flotation pontoon, 14, third radar reflecting plate, 15, fourth radar reflecting plate, 16, third radar level gauge, 17, fourth radar level gauge.

Detailed Description

The structure of the invention is further explained in the following with the attached drawings of the specification.