CN205014048U - Intelligence measurement sled - Google Patents

Abstract

The utility model relates to an intelligent metering skid. The main intake pipe communicates with at least two intake branch pipes. Each intake branch pipe is provided with a filter. After the filter cleans the future air, it is divided into two metering branches. Each metering branch There is a flow meter and an electric cut-off valve behind the flow meter; the two metering branches are combined into one outlet branch pipe, and each outlet branch pipe is combined into one outlet main pipe; it also includes an intelligent metering control box, an intelligent metering control box and a filter, The flowmeter and electric cut-off valve signal are connected, the flowmeter transmits the flow data signal to the intelligent metering control box, and the intelligent metering control box selects the electric cutoff valve of each metering branch to open and close according to the actual running flow rate, so as to select the appropriate total flow rate The measurement range is realized; the power line is connected to the explosion-proof distribution box, and the explosion-proof distribution box supplies power to the smart metering control box and the electric isolation valve; the smart metering skid is set in the gas company, and each smart metering skid is connected to each Gas units correspond one to one.

Description

An intelligent metering skid

technical field

The utility model relates to an intelligent metering skid, which is used to satisfy industrial, commercial and public building users in the gas transmission and distribution to carry out precise metering in a large flow range, and belongs to the technical field of gas transmission and distribution metering.

Background technique

At present, industrial and commercial users, such as ceramic kiln users, heat treatment furnace users of mechanical parts, natural gas heater users, commercial residential users, etc., have a lot of gas-consuming equipment, and the gas consumption of a single combustion equipment is small, but the total gas consumption The amount is very large; and according to the nature of the gas used, according to the different process procedures, the temperature achieved by the gas combustion and the time for holding the heat are also different; the frequency of use and working conditions of multiple production lines are also different, which also makes the gas consumption The law is complex, and the hourly flow range varies greatly;

Industrial and commercial users have a lot of gas equipment, and the gas consumption of a single combustion equipment is small, but the total gas consumption is very large, use multiple smaller flowmeters to measure separately or separately;

Industrial and commercial users use shunt metering for the frequency of use of multiple production lines and different working conditions;

The production process gas, heating gas, and domestic gas of industrial and commercial users are separately measured to reduce the measurement error caused by the unbalanced gas consumption.

The existing industrial and commercial user measurement methods have the following defects:

1) The internal pipeline is complicated and there are many leakage points;

2) The number of flow meters is large, the installation environment is harsh, and meter reading is difficult;

3) There are many types and brands of flowmeters, and the flowmeters are constantly replaced with new ones from the beginning of operation, which makes maintenance difficult. Even the production of flowmeters of some brands and types has stopped, and the spare parts cannot keep up with the problem;

4) The production status of continuous gas supply makes these flowmeters unable to be calibrated on time and increases the measurement error;

5) Some flowmeters have no temperature and pressure compensation, and the measurement error is large;

6) All measurement signals are not collected and summarized, and there is no data, which is not conducive to subsequent data analysis, and is not conducive to process improvement and energy consumption reduction;

7) The reliability of the entire metering system is low; resulting in a large production-to-sales ratio of the gas company, resulting in a huge deficit.

Utility model content

The purpose of this utility model is to solve the above-mentioned series of technical problems, to provide a metering skid combination device with a large range ratio, which can change the overall range ratio of the system according to the actual operating flow rate, improve the accuracy of the metering system, and improve the measurement Turndown range of the device.

The utility model takes the following technical solutions:

An intelligent metering skid, including an air intake main pipe, the air intake main pipe communicates with at least two air intake branch pipes, each air intake branch pipe is equipped with a filter B2, and the filter B2 filters the upstream air and divides it into two metering pipes Branches, each metering branch is equipped with a flowmeter B3 and an electric cut-off valve B6 behind the flowmeter; the two metering branches are combined into one outlet branch pipe, and each outlet branch pipe is combined into one outlet main pipe; intelligent metering control box is also included , the intelligent metering control box is connected with the signal of the filter B2, the flow meter B3, and the electric cut-off valve B6, the flow meter B3 transmits the flow data signal to the intelligent metering control box, and the intelligent metering control box selects to open and close each valve according to the actual flow rate. The electric cut-off valve B6 of the metering branch, so as to select the appropriate range of the total flow to realize the measurement; the power line is connected to the explosion-proof distribution box, and the explosion-proof distribution box supplies power to the intelligent metering control box and the electric cut-off valve B6; The smart metering skids mentioned above are arranged at the gas consumption units, and each smart metering skid corresponds to each gas consumption unit one by one.

Further, a filter valve B1 is provided in front of the filter B1 to block the gas path.

Further, it also includes an explosion-proof signal box, and the explosion-proof signal box is connected with the signal of the intelligent metering control box, and is connected with the wireless signal of the remote control center. The parameter setting of the box can realize on-site debugging and parameter adjustment through the external PC equipment of the explosion-proof signal box.

Furthermore, the explosion-proof distribution box supplies power to the explosion-proof signal box.

Further, a pressure gauge B4 is provided between the flow meter B3 and the electric isolation valve B6 for pressure monitoring and maintenance.

Further, the number of the intake branch pipes is two, and the smart metering skid has 4 metering branches in total, and the range ratio of the flowmeter on each metering branch is 100:1. The entire smart metering skid can be The system turndown ratio range is 400:1.

A metering method for an intelligent metering skid according to a claim,

The flow path switching method is as follows:

1) The main and auxiliary roads are switched, and there are four main and auxiliary roads in sequence: the first road is the main one, and the opening sequence of the branch roads is one, two, three, and four; the closing order is reversed;

2) Branch circuit opening conditions: When the critical flow rate of the single-circuit design measured by each flowmeter B3 exceeds a period of time, the control valve of the next group of available gas circuits will be automatically opened. The specific opening operation mode is: single-channel design flow rate >80% over 20 seconds, increase from group 1 to group 2; single-channel design total flow >160% over 20 seconds, increase from 2 groups to 3 groups; single-channel design total flow >240% over 20 seconds, from 3 groups Increased to 4 groups; the cut-out control is reversed. When reaching different critical flow rates and maintaining them for a period of time, the control valves of the corresponding gas circuits will be automatically closed in sequence. The specific closing operation mode is: single-channel design flow rate < 200 % over 20 seconds, reduce from 4 groups to 3 groups; single-channel design flow <120% over 20 seconds, reduce from 3 groups to 2 groups; single-channel design flow <40% over 20 seconds, reduce from 2 groups to 1 group .

Further, single-channel failure or maintenance status: the actuator takes the remote/local signal as a reference. If the signal of a certain channel does not exist, the actuator of this channel does not participate in the control; when the condition of opening the second channel is met, the open command is issued. , if the instantaneous flow rate data of the second channel flow meter is still not 0 within 20 seconds, then control the third channel to open.

The beneficial effects of the utility model are:

1) Improve the reliability of the metering system, reduce system components, and improve system security; reduce the cost of manpower meter reading, reduce the cost of metering system construction, and reduce subsequent operating costs;

2) The accuracy of the metering system is improved. The smart metering skid combined with efficient and accurate control system + high-range ratio and high-precision flowmeter makes the metering of industrial and commercial users more accurate, reduces the ratio of production to sales, and brings huge benefits to the gas company ;

3) The feedback data collected by the intelligent and intelligent control system can also allow the gas company to manage industrial and commercial users more conveniently. Better service to business users.

4) The structural design of the intelligent skid is conducive to the management and maintenance of the system.

Description of drawings

Fig. 1 is a structural diagram of the utility model intelligent metering skid.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.

Referring to Figure 1, an intelligent metering skid includes an air intake main pipe, which communicates with at least two air intake branch pipes, each air intake branch pipe is provided with a filter B2, and the filter B2 filters the upstream air Divided into two metering branches, each metering branch is equipped with a flow meter B3 and an electric cut-off valve B6 behind the flow meter; the two metering branches are combined into one outlet branch pipe, and each outlet branch pipe is combined into one outlet main pipe; also includes Intelligent metering control box, the intelligent metering control box is connected with filter B2, flowmeter B3, electric cut-off valve B6 signal, flowmeter B3 transmits the flow data signal to the intelligent metering control box, the intelligent metering control box according to the flow rate of actual operation Select the electric cut-off valve B6 to open and close each metering branch, so as to select the appropriate range of the total flow to realize the measurement; the power line is connected to the explosion-proof distribution box, and the explosion-proof distribution box is connected to the intelligent metering control box and the electric cut-off valve B6 power supply; the smart metering skid is set at the gas consumption unit, and each smart metering skid corresponds to each gas consumption unit one by one.

A filter valve B1 is arranged in front of the filter B1 to block the gas path.

It also includes an explosion-proof signal box. The explosion-proof signal box is connected to the signal of the intelligent metering control box and wirelessly connected to the remote control center. The signal of the entire intelligent metering skid can be transmitted and controlled remotely through the explosion-proof signal box. The parameters of the intelligent metering control box The setting can realize on-site debugging and parameter adjustment through an external PC device connected to the explosion-proof signal box.

The explosion-proof distribution box supplies power to the explosion-proof signal box.

A pressure gauge B4 is provided between the flowmeter B3 and the electric isolation valve B6 for pressure monitoring and maintenance.

The number of the intake branch pipes is two, and the smart metering skid has 4 metering branches in total. The range ratio of the flowmeter on each metering branch is 100:1. The whole smart metering skid can realize the system range The ratio range is 400:1.

In order to achieve a larger measuring range, the control logic is innovatively designed, as follows:

According to the installation conditions and environmental conditions of industrial and commercial users, an independent and reliable special control system is selected to realize data collection and remote transmission, and the system is independently and efficiently controlled through reasonable and rigorous algorithms and logic; the logic of flow path switching is considered as follows:

1) Main and auxiliary channel switching

Taking the four roads as an example, the main and auxiliary roads are positioned in four order:

The first road is the main one, and the branch roads are opened in the order of one, two, three, and four; the closing order is reversed;

The second road is the main one, and the branch roads are opened in the order of two roads, three roads, four roads, and one road; the closing order is reversed;

The third road is the main one, and the branch roads are opened in the order of three roads, four roads, one road, and two roads; the closing order is reversed;

The fourth road is the main one, and the branch roads are opened in the order of four roads, one road, two roads, and three roads; the closing order is reversed.

2) Branch opening condition

When the critical flow rate (preliminarily set to 80%) of the single-circuit design reached by each flow meter measurement exceeds a period of time, the control valve of the next group of available gas circuits will be automatically opened. The overall operation mode is: single-channel design flow > 80% for more than 20 seconds, increase from group 1 to group 2; single-channel design total flow > 160% for more than 20 seconds, increase from 2 groups to 3 groups; single-channel design total flow >240% over 20 seconds, from 3 sets to 4 sets. The cut-out control is the opposite. When different critical flow rates are reached and maintained for a period of time, the control valves of the corresponding gas circuits will be automatically closed in order. The overall operation mode is: single-channel design flow rate < 200% over 20 seconds, reduce from 4 groups to 3 groups; single-channel design flow rate < 120% over 20 seconds, reduce from 3 groups to 2 groups; single-channel design flow rate < 40 % over 20 seconds, reduced from 2 sets to 1 set.

Single fault or maintenance status

The actuator takes the remote/local signal as a reference. If the signal does not exist in a certain channel, the actuator in that channel will not participate in the control.

The condition for opening the second channel is that if the instantaneous flow data of the second channel flowmeter is still not 0 within 20 seconds after the open command is issued, the third channel is controlled to be opened.

Note: The time in this logic is a tentative value and can be adjusted according to working conditions.

The utility model overcomes the deficiencies and defects of the original metering method by studying the defects of the original metering method of the industrial and commercial users and studying the characteristics of the gas consumption of the industrial and commercial users.

In this embodiment, through the combination of metering circuits and supporting control systems, an intelligent metering skid with a large range can be realized, and the range of the system (ratio of maximum and minimum flow) can be 400:1;

The explosion-proof design is carried out for the selected control box, and the explosion-proof control box, distribution box, and signal box are arranged in a centralized manner, and the design of the intelligent metering skid is optimized, which is in line with the access of 220VAC civil electricity, and can adapt to the installation conditions and environmental conditions of all industrial and commercial users. .

Claims (6)

1. an intelligent metering sled, is characterized in that:

Comprise intake manifold, described intake manifold is communicated with at least two air intake branches, each air intake branch is equipped with filter (B2), upstream is carried out gas and is filtered clean rear point two metering branch roads by filter (B2), and every bar metering branch road is configured with flowmeter (B3) and the electronic isolating valve (B6) after being positioned at flowmeter; Article two, metering branch road is merged into one and is gone out gas branch pipe, respectively goes out gas branch pipe and merges into the house steward that gives vent to anger;

Also comprise intelligent metering control box, described intelligent metering control box is connected with filter (B2), flowmeter (B3), electronic isolating valve (B6) signal, flowmeter (B3) by data on flows signal transmission to intelligent metering control box, intelligent metering control box selects the electronic isolating valve (B6) of opening and closing each bar metering branch road according to the flow of actual motion, thus choose the range ability of suitable total discharge, realize metering; Power line is linked into explosion-proof electrical distribution box, and explosion-proof electrical distribution box is to intelligent metering control box and electronic isolating valve (B6) power supply;

Described intelligent metering sled is arranged at place of gas unit, each intelligent metering sled and each gas unit one_to_one corresponding.

2. intelligent metering sled as claimed in claim 1, is characterized in that: described filter (B1) is front is provided with Filter valve (B1), for cutting off gas circuit.

3. intelligent metering sled as claimed in claim 1, it is characterized in that: also comprise explosion-proof signal box, described explosion-proof signal box is connected with intelligent metering control box signal, and be connected with remote control center wireless signal, the signal of whole intelligent metering sled can by explosion-proof signal box teletransmission and control, and the setting parameter of intelligent metering control box can realize on-the-spot debugging and the adjustment of parameter by the external PC equipment of explosion-proof signal box.

4. intelligent metering sled as claimed in claim 3, is characterized in that: explosion-proof electrical distribution box is powered to explosion-proof signal box.

5. intelligent metering sled as claimed in claim 1, is characterized in that: be provided with pressure gauge (B4) between described flowmeter (B3) and electronic isolating valve (B6), for pressure monitor and maintenance.

6. intelligent metering sled as claimed in claim 1, it is characterized in that: the quantity of described air intake branch is two, described intelligent metering sled has 4 metering branch roads, the scope of the range ratio of the flowmeter on every bar metering branch road is 100:1, whole intelligent metering sled, can realize system range ratio scope is 400:1.