CN214149469U - Measuring and commissioning device of saturated steam flow instrument - Google Patents

Abstract

The utility model provides a saturated steam flow meter measures device of putting into operation relates to automatic instrument control field. The commissioning device is detachably added in the existing differential pressure type flow measurement system and comprises a metal union, a three-valve group, a pressure gauge, a check valve and a water supply pump which are sequentially connected through a hose. The device of the utility model has the characteristics of rapidity of measurement and convenient operation and maintenance in the steam flow detection and analysis, avoids the problems of influencing normal production, inaccurate energy metering and the like, and reduces economic loss; the steam flow meter can be quickly put into operation in any occasions where the steam flow is measured by using a differential pressure transmitter; the time for forming the measured liquid column differential pressure by the differential pressure type flowmeter is shortened, the problem that air bubbles are contained in the pressure leading pipe is solved, the problem of unbalanced liquid level between the positive pressure leading pipe and the negative pressure leading pipe is solved, and the measurement accuracy, stability and rapidity of the steam flow detection system are improved.

Description

Measuring and commissioning device of saturated steam flow instrument

Technical Field

The utility model relates to an automatic change instrument control technical field, especially relate to a saturated steam flow meter measures device of putting into operation.

Background

Energy conservation and environmental protection are the major trends of the development of the enterprises at present, economic benefits of the sub-plants in the enterprises are independently accounted, and the steam metering work is paid more and more attention by the enterprises. The main uses of steam are: heating, humidifying, generating power and driving. Part of steam generated by the thermal power generation heat supply unit is used for providing power for metallurgical production plants, and the other part of steam is subjected to temperature and pressure reduction to reduce the steam pressure to 0.8-1.3 MPa to form low-pressure saturated steam for heating of plants or heat exchangers in metallurgical chemical engineering and the like. The steam metering is related to the statistics and the evaluation of energy consumption, is directly related to the economic benefits of steam producing units and steam consuming units, and meanwhile, the steam consuming units correctly control the steam metering amount, thereby being greatly helpful for the production process. Therefore, the accurate and timely measurement of the steam flow is very important.

With the development of the meter technology, more and more varieties of flowmeters and flow measuring means are applied to various industrial fields, and the differential pressure flowmeter has been widely applied due to the characteristics of simple structure, strong universality, long service life, convenient remote transmission of signals, higher and higher precision and the like. The theoretical basis for differential pressure flowmeters is the bernoulli equation and the flow continuity equation. When fluid flows through the throttling device, part of pressure energy is converted into kinetic energy to generate a differential pressure signal, and the differential pressure is proportional to the square of the flow. The differential pressure flowmeter is produced and used according to GB/T2624-1993 that the orifice plate, the nozzle and the Venturi tube for the flow measurement throttling device measure the flow of fluid filled with a round tube. Different differential pressure gauges can be selected based on the differential pressure generated by the flow sensing member installed in the pipe and known fluid conditions, as well as the geometry of the sensing member and the pipe, to improve sensing accuracy, stability and extend the service life of the flow meter.

In the existing production process, a differential pressure type flow measurement system shown in fig. 1 is usually adopted to measure the steam flow in a steam pipeline, because the steam pipeline contains water or other impurities, in order to avoid influencing the detection accuracy of a differential pressure transmitter, a pressure guide system needs frequent pollution discharge, condensed water in a pressure guide pipe can be discharged during pollution discharge, the differential pressure transmitter needs to wait for about 8-24 hours to collect condensed liquid when put into operation again, after the pressure guide pipe is filled with the condensed liquid, detection can be realized, but the process time of filling the pressure guide pipe with the condensed water is long, and the pressure guide pipe contains air bubbles frequently, the positive and negative pressure liquid level measurement of a condensed liquid column is unbalanced, the detection of the steam flow is influenced, the production is influenced, and serious economic loss is brought.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that above-mentioned prior art exists, provide a saturated steam flow meter measures device of commissioning, this commissioning device detachable increases to be established in current differential pressure formula flow measurement system, can form differential pressure formula flowmeter measurement liquid column differential pressure fast, makes differential pressure formula flowmeter measure more timely, accurate.

In order to realize the above purpose, the utility model provides a technical scheme is a saturated steam flow meter measures device of putting into operation, and this device of putting into operation can dismantle with differential pressure formula flow measurement system and be connected, including looping through hose connection's metal union, three valves, manometer, check valve, working shaft.

Preferably, in an embodiment of the present invention, the metal union is detachably connected to the differential pressure type flow measuring system through a metal hose.

Preferably, in an embodiment of the present invention, the pressure gauge is a bourdon tube pressure gauge.

Preferably, in an embodiment of the present invention, the three valve sets, the pressure gauge, the check valve, and the water supply pump are all fixedly mounted on a support platform.

Furthermore, the support platform is a flat plate made of metal.

Preferably, in an embodiment of the present invention, a motor switch is further fixed on the support panel, and the motor switch is electrically connected to a motor on the water supply pump.

Compared with the prior art, owing to adopted above-mentioned technical scheme, the beneficial technological effect of the utility model is that:

(1) the commissioning device has the characteristics of rapidity in measurement and convenience in operation and maintenance in steam flow detection and analysis, avoids the problems of influence on normal production, inaccurate energy metering and the like, and reduces economic loss;

(2) the fittings required by the commissioning device are assembled and fixed on the metal support platform to form a set of fixing device which is convenient to carry, flexible to use on site and capable of being quickly commissioned in any occasion involving the measurement of steam flow by using a differential pressure transmitter;

(3) the structure is reasonable, the installation is convenient, the time for forming the measured liquid column differential pressure by the differential pressure type flowmeter is shortened, the problem that air bubbles are contained in the pressure leading pipe is solved, the problem of unbalanced liquid level between the positive pressure leading pipe and the negative pressure leading pipe is eliminated, and the measurement accuracy, stability and rapidity of the steam flow detection system are improved;

(4) starting from solving the actual problems on site, the steam flow detection system reduces the failure rate and processing time, and can be widely applied to industries such as electric power, metallurgy, chemical engineering and the like.

Drawings

FIG. 1 is a schematic diagram of a prior art differential pressure flow measurement system;

fig. 2 is a schematic structural view of a saturated steam flow meter measuring and commissioning device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the commissioning device of FIG. 2 in assembly connection with the differential pressure flow measurement system of FIG. 1;

reference numerals: 1-steam pipeline, 2-throttling device, 3-primary valve, 4-exhaust valve, 5-condensation tank, 6-positive pressure valve, 7-negative pressure valve, 8-balance valve, 9-differential pressure transmitter, 10-pressure pipe, 11-blow-down valve, 12-metal union, 13-three valve group, 14-pressure gauge, 15-check valve, 16-water supply pump, 17-motor switch, 18-water storage tank, 19-metal hose and 20-support platform.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by preferred embodiments.

PREFERRED EMBODIMENTS

Referring to fig. 2, the device for measuring and commissioning a saturated steam flow meter provided by the present invention is detachably connected to a differential pressure type flow measuring system, and includes a metal union 12, a three-valve set 13, a pressure gauge 14, a check valve 15 and a water supply pump 16, which are sequentially connected by a hose; the metal movable joint 12 is detachably connected with the differential pressure type flow measurement system through a metal hose 19, the pressure gauge 14 is a spring tube pressure gauge, the three valve groups 13, the pressure gauge 14, the check valve 15 and the water supply pump 16 are all fixedly arranged on a support platform, and the support platform 20 is a flat plate made of metal; a motor switch 17 is further fixed on the bracket platform 20, and the motor switch 17 is electrically connected with a motor on the water supply pump 16.

Referring to fig. 1, the differential pressure type flow measurement system includes a throttling device 2, a positive pressure pipeline, a negative pressure pipeline, a primary valve 3, a condensing tank 5, a pressure-leading pipe 10, and a blowoff valve 11, wherein the positive pressure pipeline and the negative pressure pipeline are sequentially provided with the primary valve 3, the condensing tank 5, the pressure-leading pipe 10 is connected with a positive pressure-leading valve 6, the negative pressure pipeline 10 is connected with a negative pressure-leading valve 7, the positive pressure-leading valve 6 and the negative pressure-leading valve 7 are connected through a pipeline, a balance valve 8 and a differential pressure transmitter 9 are connected in parallel on the pipeline between the positive pressure-leading valve 6 and the negative pressure-leading valve 7, the positive pressure pipeline and the negative pressure pipeline are communicated with a steam pipeline 1, the throttling device 2 is arranged on the steam pipeline 1 between the positive pressure pipeline and the negative pressure pipeline, and the top of the condensing tank 5 is further provided with an exhaust valve 4.

Referring to fig. 3, in operation, considering that the steam pipe 1 contains moisture and other impurities, the blowoff valve 11 is opened to perform the blowdown treatment, after the blowdown is completed, the differential pressure type flow measuring system shown in fig. 1 needs to be put into operation again on site, and at this time, as shown in fig. 3, the commissioning device of the present invention shown in fig. 2 is connected to the lower end of the blowoff valve 11 of the original differential pressure type flow measuring system shown in fig. 1 by using the metal hose 19 and the metal union 12. After the assembly connection is completed, a pressure difference is established between the positive pressure guiding pipe 10 and the negative pressure guiding pipe 10, in the first step, the primary valve 3 is closed, gas in the steam pipeline 1 is prevented from entering the pressure guiding pipe 10, and the exhaust valve 4 is opened, so that whether the pressure guiding pipe 10 is full of condensed water or not can be conveniently observed; secondly, all valves of the three valve groups 13 are opened, a motor switch 17 on the support platform is opened, the positive pressure pipe 10 and the negative pressure pipe 10 are filled with condensate water which is prepared in advance, the positive pressure pipe 10 and the negative pressure pipe 10 can be simultaneously filled with the condensate water by manually adjusting balance valves of the three valve groups 13 in the water injection process, and time is saved; observing the overflow phenomenon of the exhaust valve 4, which indicates that the positive pressure guiding pipe 10 is filled with the condensed water, closing the exhaust valve 4 at the moment, and closing a motor switch 17 of the water supply pump 16; and the pipelines behind the three valve groups 13 are combined into one pipe, and a pressure gauge 14 is connected to the combined pipeline. The pressure in the pressure guiding pipe 10 is judged, the real-time control of the water supply pump 16 can be realized according to the formula P ═ ρ gH, and the water supply time interval can be adjusted according to the requirement; by observing the pressure of the pressure gauge 14, when the pressure in the pressure guiding pipe 10 is consistent with the pressure in the steam pipeline 1, the primary valve 3 is opened, so that the purpose of measuring the steam flow is achieved; when the internal pressure difference of the pressure guiding pipe 10 is stable, the water supply pump 16 is closed, the check valve 15 is used for preventing the backflow of condensed water, the pressure stability can be ensured, the situation that the water supply pump 16 continuously supplies water to consume electric power and continuously supplies water to influence the measurement accuracy can be avoided, the process from sewage discharge to the establishment of the measured liquid column differential pressure only needs about 10 minutes, and the original long-period waiting process needing 8-24 hours is greatly shortened.

The device can be used for finishing the work, namely realizing the rapid operation of the steam differential pressure type flowmeter for measuring the differential pressure of the liquid column, closing the blowoff valve 11 at the moment, disconnecting the metal movable joint 12, collecting and arranging the metal hose 19 and the device, and facilitating the rapid operation of the next differential pressure transmitter 9, and greatly shortening the time for putting the differential pressure type flow measurement system into operation again.

The front and rear straight pipe sections of the steam pipeline 1 provided with the throttling device 2 are as long as possible in principle, so that the length of the front straight pipe section of the throttling device 2 is at least 10 times of the pipe diameter, and the length of the rear straight pipe section of the throttling device 2 is at least 5 times of the pipe diameter.

The pressure guiding pipe 10 should be installed to be vertical or have a certain inclination with the horizontal plane, so as to remove gas, moisture, liquid or solid particles accumulated in the pressure guiding pipe 10 and influence the accurate transmission of the differential pressure signal.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not to be limited by the foregoing description, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. The utility model provides a saturated steam flow meter measures device of putting into operation which characterized in that, this device of putting into operation and differential pressure type flow measurement system can dismantle and be connected, includes metal loose joint, three valves, manometer, check valve, the working shaft that loops through the hose connection.

2. The saturated steam flow meter measurement commissioning device of claim 1, wherein: the metal movable joint is detachably connected with the differential pressure type flow measuring system through a metal hose.

3. The saturated steam flow meter measurement commissioning device of claim 1, wherein: the pressure gauge is a bourdon tube pressure gauge.

4. The saturated steam flow meter measurement commissioning device of claim 1, wherein: the three valve groups, the pressure gauge, the check valve and the water supply pump are all fixedly arranged on a support platform.

5. The saturated steam flow meter measurement commissioning device of claim 4, wherein: the support platform is a flat plate made of metal.

6. The saturated steam flow meter measurement commissioning device of claim 5, wherein: and a motor switch is further fixed on the support platform and is electrically connected with a motor on the water supply pump.

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