CN223319849U - A high-precision and wide-range steam metering device - Google Patents

Abstract

The utility model relates to a high-precision, wide-range steam metering device, comprising a main steam pipe and a bypass steam pipe arranged in parallel: a first flow meter is installed on the main steam pipe, and a second flow meter is installed on the bypass steam pipe, the first flow meter has lower measurement accuracy and a larger range than the second flow meter; a flow computer, the flow computer is electrically connected to the first flow meter and the second flow meter; the utility model is provided with a metering device with two pipes and two flow meters, the main steam pipe is relatively thick and the bypass steam pipe is relatively thin, the main steam pipe is equipped with a large flow meter, and the bypass steam pipe is equipped with a small flow meter. The small flow meter is used in the initial stage of operation or when the flow rate is small during the off-season, and is switched to the large flow meter when mass production is reached or the flow rate is large during the peak season. The large flow meter and the small flow meter share a set of flow computers and data upload equipment, reducing redundancy. There are only two flow meters, and the simple device composition saves unnecessary equipment investment.

Description

High-precision wide-range steam metering device

Technical Field

The utility model relates to the technical field of steam metering, in particular to a high-precision wide-range steam metering device.

Background

Power plants provide steam to users in a common energy service mode, which is typically implemented by a Cogeneration (CHP) or cogeneration system, and can provide both electricity and heat energy to increase energy utilization efficiency.

The power plant transmits the steam to the user side through the pipeline network, a flowmeter is needed to monitor the transmitted steam quantity in the process, and the steam user is greatly different from the steam consumption in the season of light season and the season of heavy season, so that the flowmeter is not matched in shape selection. Meanwhile, the measuring range of the flowmeter is limited, and all production working conditions of a user cannot be covered.

Therefore, the power plant usually lets the steam user report the flow, however, the deviation between the reported flow and the actual flow is larger, and the existing method for requiring the heat user to report the minimum flow as the minimum steam usage amount has larger value, so that the problem that more heat cost is still generated when the user does not use the steam is unavoidable, and the popularization difficulty is increased.

In order to improve the measurement precision, the prior metering device provided with a plurality of flow meters is generally provided with a plurality of sets of flow metering cabinets, and unnecessary redundancy is generated, so that the metering device with a small number of used flow meters and high precision and wide range can be achieved.

Disclosure of utility model

Aiming at the defects of the prior art, the utility model provides a high-precision wide-range steam metering device to solve the problems.

The utility model provides the following technical scheme:

The utility model provides a high accuracy wide range steam metering device which characterized in that includes main steam pipeline and bypass steam pipeline that the parallel set up:

The main steam pipeline is provided with a first flowmeter, the bypass steam pipeline is provided with a second flowmeter, and the first flowmeter has low measurement precision and large measurement range relative to the second flowmeter;

the flow computer is electrically connected with the first flowmeter and the second flowmeter;

The main steam pipeline and the bypass steam pipeline are respectively provided with a temperature transmitter, a pressure transmitter, a differential pressure transmitter and an electric stop door which correspond to each other;

The electric stop door is characterized by further comprising an alarm, a timer and a prompt lamp which are electrically connected with the flow computer, wherein each electric stop door is provided with a corresponding prompt lamp;

The alarm is arranged in the control room and used for responding to an alarm instruction output by the flow computer and sending out an alarm signal;

And the prompt lamp positioned on the electric stop door on the site is used for responding to the alarm instruction output by the flow computer and sending out a prompt signal.

Preferably, the first flowmeter or the second flowmeter adopts an orifice plate flowmeter or a vortex street flowmeter or a venturi flowmeter.

Preferably, the flow meter further comprises a display electrically connected with the flow computer, wherein the display is used for displaying the flow of the first flow meter and the flow of the second flow meter in real time.

The utility model has the following beneficial technical effects:

The utility model is provided with a metering device with double pipelines and double flow meters, a main steam pipeline is thicker and a bypass steam pipeline is thinner, the main steam pipeline is provided with a large flow meter, and the bypass steam pipeline is provided with a small flow meter. When the flow rate is small in the initial stage of operation or in the low season, a small flow meter is used, and when the flow rate is large in mass production or in the high season, the flow rate is switched to a large flow meter.

The large flowmeter and the small flowmeter share one set of flow computer and data uploading equipment, redundancy is reduced, and only two flowmeters and equipment are simple in composition, so that unnecessary equipment investment is saved.

Through the cooperation of the timer, when the flow value measured by the first flow meter or the second flow meter is lower than the minimum flow or is greater than the accumulated time length of the maximum flow and exceeds the set time length, an alarm is sent out, so that the electric stop door is not smoothly and automatically switched at the moment, and the electric stop door needs to be manually switched.

Drawings

Fig. 1 is a schematic diagram of the structure of the present utility model.

FIG. 2 is a flow chart of an embodiment of the present utility model.

Fig. 3 is a schematic circuit diagram of the present utility model.

The reference numerals in the figures are:

1. a main steam pipeline, a bypass steam pipeline;

1-1 parts of a first flowmeter, 2-1 parts of a second flowmeter, 1-2 parts of an electric stop door, 1-3 parts of a temperature transmitter, 1-4 parts of a pressure transmitter, and 1-5 parts of a differential pressure transmitter.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

A high precision wide range steam metering device, as shown in fig. 1:

Comprises a main steam pipeline 1 and a bypass steam pipeline 2 which are connected in parallel, wherein the main steam pipeline 1 is thicker than the bypass steam pipeline 2.

The main steam pipeline 1 is provided with two electric stop doors 1-2, a first flowmeter 1-1, a temperature transmitter 1-3, a pressure transmitter 1-4 and a differential pressure transmitter 1-5 which are positioned between the two electric stop doors 1-2.

Two electric cut-off doors 1-2, a second flowmeter 2-1 positioned between the two electric cut-off doors 1-2, a temperature transmitter 1-3, a pressure transmitter 1-4 and a differential pressure transmitter 1-5 are arranged on the bypass steam pipeline 2.

The types and the sizes of the electric stop gate 1-2, the temperature transmitter 1-3, the pressure transmitter 1-4 and the differential pressure transmitter 1-5 on the main steam pipeline 1 and the bypass steam pipeline 2 are correspondingly selected according to pipe diameters.

The first flowmeter 1-1 has low measurement accuracy and large measurement range relative to the second flowmeter 2-1.

The flow computer can adopt a central processing unit or a PLC (programmable logic controller) and the like, and is electrically connected with the first flow meter 1-1 and the second flow meter 2-1, and the first flow meter 1-1 and the second flow meter 2-1 share one set of flow computer and data uploading equipment.

As shown in fig. 2:

The hot user declares the maximum flow c and the minimum flow a when the steam is normally used, i.e. a < flow < c.

If c <10a, selecting a single flowmeter (first flowmeter 1-1 or second flowmeter 2-1) for metering;

If c >10a, a dual flow meter (first flow meter 1-1 and second flow meter 2-1) is selected for steam metering.

For the case of c >10a, one flow value b is empirically chosen such that a < b < c.

A steam supply pipeline as shown in fig. 1 is constructed, the design through-flow range of the main steam pipeline 1 and the first flowmeter 1-1 is b < flow < c, and the design through-flow range of the bypass steam pipeline 2 and the second flowmeter 2-1 is a < flow < b.

When the steam flow is b < flow < c, the main steam pipe 1 is put into, and the bypass steam pipe 2 is closed. When the steam flow rate is a < flow rate < b, the bypass steam pipe 2 is put into the main steam pipe 1 to be closed.

The lower limit value a is set for the second flowmeter 2-1, the lower limit value b is set for the first flowmeter 1-1, and when the user is below the lower limit value, the metering is performed according to the lower limit value, and when the user is not in use, the metering is not performed.

Embodiment two, including the whole content of embodiment one, is different in that:

as shown in fig. 1 and 3, the automatic switching of the electric cut-off gate 1-2 cannot be realized, and the bypass steam pipe 2 is operated when the flow rate is too large, and the main steam pipe 1 is operated when the flow rate is too small.

The flow meter also comprises an alarm, a prompting lamp, a display and a timer which are electrically connected with the flow computer;

The alarm is installed in the control room, the electric stop doors 1-2 are installed on site, and each electric stop door 1-2 is provided with a prompting lamp.

The display displays the flow data of the first flow meter 1-1 or the second flow meter 2-1 in real time while presenting the minimum contrast flow line of the main steam line 1 or the maximum contrast flow line of the bypass steam line 2. Through the visual display mode, a user can quickly judge whether the current steam flow is matched with the main steam pipeline 1 or the bypass steam pipeline 2.

Because the first flowmeter 1-1 has a minimum flow value, the second flowmeter 2-1 has a maximum flow value, the timer is used for recording the accumulated time length of the first flowmeter 1-1 reaching the minimum flow value or the accumulated time length of the second flowmeter 2-1 reaching the maximum flow value, and when the accumulated time length recorded by the timer exceeds a preset value, an alarm instruction is sent to the flow computer to indicate that the steam flow is not matched with the used pipeline and the electric stop door 1-2 is not normally and automatically switched.

The flow computer receives the instruction sent by the timer and then controls the alarm to work so as to prompt the staff in the control room. Meanwhile, the electric stop gate 1-2 on site prompts the light to illuminate;

For example, if the first flowmeter 1-1 accumulates for 1 hour a day at a minimum flow value, the flow computer will trigger an alarm at the control room. The user on site can quickly position the electric cut-off gate 1-2 by means of the illuminated warning light and manually switch the steam from the main steam line 1 to the bypass steam line 2.

The foregoing examples merely illustrate specific embodiments of the utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (3)

1. The high-precision wide-range steam metering device is characterized by comprising a main steam pipeline (1) and a bypass steam pipeline (2) which are arranged in parallel:

the main steam pipeline (1) is provided with a first flowmeter (1-1), the bypass steam pipeline (2) is provided with a second flowmeter (2-1), and the first flowmeter (1-1) has low measurement precision and large measurement range relative to the second flowmeter (2-1);

The flow computer is electrically connected with the first flowmeter (1-1) and the second flowmeter (2-1);

The main steam pipeline (1) and the bypass steam pipeline (2) are respectively provided with a corresponding temperature transmitter (1-3), a corresponding pressure transmitter (1-4), a corresponding differential pressure transmitter (1-5) and a corresponding electric stop door (1-2);

Also comprises an alarm, a timer and a prompt lamp which are electrically connected with the flow computer, each electric stop door (1-2) is provided with a corresponding indicator light;

The alarm is arranged in the control room and used for responding to an alarm instruction output by the flow computer and sending out an alarm signal;

the prompt lamp on the electric stop gate (1-2) is used for responding to the alarm instruction output by the flow computer and sending out a prompt signal.

2. A high precision wide range steam metering apparatus as claimed in claim 1 wherein the first flowmeter (1-1) or the second flowmeter (2-1) is an orifice plate flowmeter or a vortex street flowmeter or a venturi flowmeter.

3. The high-precision wide-range steam metering device as claimed in claim 1, further comprising a display electrically connected to the flow computer, wherein the display is used for displaying the flow of the first flowmeter (1-1) and the second flowmeter (2-1) in real time.