CN201497531U

CN201497531U - Heating pipe network steam flow totalizer

Info

Publication number: CN201497531U
Application number: CN200920234207XU
Authority: CN
Inventors: 周伟
Original assignee: Nanjing Handiya Automatization Control Technology Co Ltd
Current assignee: Nanjing Handiya Automatization Control Technology Co Ltd
Priority date: 2009-08-03
Filing date: 2009-08-03
Publication date: 2010-06-02
Anticipated expiration: 2019-08-03

Abstract

The utility model discloses a heating pipe network steam flow totalizer which comprises a computer chip, an analog-to-digital converter module and a signal input interface module connected with the computer chip through the analog-to-digital converter module. The heating pipe network steam flow totalizer is characterized in that a lower-flow test platinum resistor is connected to the signal input interface module, and a triple operation module is embedded into the computer chip. The heating pipe network steam flow totalizer has simple structure, has nearly same cost compared with the prior art, has the functions of lower-flow steam testing and totalizing, overcomes the shortage in the prior art that lower-flow integration can not be carried out, and can reduce steam metering loss for heat supply enterprises.

Description

Heating network steam flow integrating instrument

Technical field:

The utility model relates to a kind of heating network steam flow integrating instrument, is specially adapted to that concentrated supply of heating in the city, the hot number of users of little ancestor are more relatively, situations such as discontinuity or astable user hot in nature.

Background technology

In cogeneration of heat and power enterprise and heat supply unit in external heat supplying process, main vortex shedding flow meter or the differential pressure flowmeter of adopting carries out steam measurement, and employing temperature, pressure carries out density compensation, thereby by a vortex shedding flow meter or differential pressure flowmeter, a pressure unit, a platinum resistance and a flow integrator are formed a cover metering system, send into flow integrator by the signal that is installed on above-mentioned three primary detecting elements on the pipeline, use the instantaneous mass flow (or heat) and the accumulation integrated flux (heat) of steam through learning the user after the integrating instrument computing.But because the restriction of fluid measurement technical merit in the world at present, the efficient working range of these two kinds of flowmeters be respectively be range 10%～100% between and between 30%～100%, being lower than minimum 10% or 30% range or exceeding is all can not accurately show its instantaneous delivery value behind the numerical value of instrument range.

Because steam is the High Temperature High Pressure parameter, flowmeter, pressure unit, the equal of platinum resistance can carry out corresponding type selecting use according to the parameter of steam, and flow integrator does not have the model and the product of steam special use.In existing metering system metering process, vortex street (or differential pressure type) flow carries out computing in respect of the then conventional universal flow integrating instrument of signal input in conjunction with pressure, temperature, and vortex street (or differential pressure type) flowmeter does not have signal (signal that is included in instrument excises when putting following low discharge state) then not carry out computing.

Flow integrator in heat supplying process is conventional universal flow integrating instrument at present, although the flow of various media that can the computing regime flow, but in heat supplying process, among the actual hot user except minority other, the overwhelming majority is noncontinuity or stable user, use the frequent control valve of steam and form pulse flow, when stopping using steam, all can exist this pass of valve to be not related to again, fit badly, situations such as valves leakage, just very most working time of Jue Daduoshuo flowmeter all is in 10% (vortex shedding flow meter) of instrument range, 30% (differential pressure flowmeter) of instrument range range following or that exceed instrument causes the instrument can't accurate measurement, or be in the following perform region of excision point of 0～8% (differential pressure flowmeter) or 0～5% (vortex shedding flow meter), these three kinds of situations have all caused the leakage meter of conventional general flow integrator, after some users add up, finally cause the high loss of the mass rate of current heating network, thereby brought direct huge economic loss for thermoelectric enterprise.

The utility model content

The utility model based on prior art to low discharge with exceed the super flow of instrument range, below the signal excision point that occurs in instrument, low discharge when the instantaneous delivery displayed value is " 0 " can't effectively be judged the reality with metering, a kind of heating network steam flow integrating instrument is provided, purpose solves cogeneration of heat and power enterprise or heating enterprise exactly in steam measurement, on the basis of in conventional common discharge integrating instrument useful range scope, accurately measuring, to be in 10% (vortex shedding flow meter) of instrument range, low discharge and the super flow that exceeds instrument range that 30% (differential pressure flowmeter) of instrument range is following, below the signal excision point that occurs in instrument, low discharge when the instantaneous delivery displayed value is " 0 " is effectively judged and metering, thereby is promoted hot user rational management in the useful range scope of metering system to use steam.

The basic ideas of the technical solution of the utility model: be exactly on the basis of present metering system, increased a cover virtual instrument (increasing by one group of specific metering module in chip) in original conventional flow integrator the user is managed with way of steam, thereby steam measurement is finished by following four sections: 1, conventional effectively work range is by real metering; 2, the part of outrange is doubly measured exceeding partly by the 5-10 of caloric value; 3, then measure by 30% or 10% according to the pattern of flowmeter respectively at 8～30% (differential pressure flowmeters) of design maximum range or at the flow of 5～10% (vortex shedding flow meters); 4, be zero promptly during the low discharge below the signal excision point in instrument once showing signal, instrument will be measured by 2～5% (vortex shedding flow meters) or 2～8% (differential pressure flowmeters) that design maximum range according to once bore, vapor (steam) temperature, the pressure and other parameters actual conditions of table at heat supply scene.

The utility model heating network steam flow integrating instrument comprises computer chip, analog-to-digital conversion module, signal input interface module, and the signal input interface module links to each other with computer chip through the analog-to-digital conversion module; It is characterized in that:, the signal input interface module is connected to a low discharge and detects platinum resistance, embeds three amount (low discharge of steam, low discharge, super flow) computing modules in computer chip.

The utility model heating network steam flow integrating instrument mode of operation:

Flow signal (vortex shedding flow meter or differential pressure flowmeter signal, be meant the steam flow signal), pressure signal (pressure unit signal), temperature signal (temperature platinum resistance signal) detect special-purpose low discharge with the steam low discharge and detect the platinum resistance temperature signal after the analog-to-digital conversion module is carried out mould/number conversion, the input computer chip.Three amount computing modules are judged the flow of steam, according to the virtual condition of steam flow, are carried out conventional effective discharge, low discharge, low discharge or the super flow accumulation of steam by existing conventional effective discharge computing module or three amount computing modules.

The utility model heating network steam flow integrating instrument, simple in structure, do not increase cost substantially with respect to prior art.Have that low discharge steam detects and totalized function, overcome the defective that prior art can not be carried out the low discharge integrating, can reduce the loss of heating enterprise steam measurement.If pipe network terminal temperature difference steam parameter is the superheated vapor state, the quality loss of pipe network can be controlled within 5% scope at least; And the terminal steam parameter of pipe network is saturated vapour or wet-steam phase, can be controlled in 10% at least.

Description of drawings

Fig. 1, be the utility model heating network steam flow integrating instrument schematic block circuit diagram;

Fig. 2, be the utility model heating network steam flow integrating instrument annexation synoptic diagram in heating network; Wherein: the 1st, heating network steam flow integrating instrument body, the 2nd, pressure unit, the 3rd, temperature sensor (platinum resistance), the 4th, flow sensor, the 5th, low discharge detects platinum resistance;

Fig. 3, be the utility model heating network steam flow integrating instrument three amount computing module arithmetic logic figure;

Wherein: q is that the special-purpose low discharge detection platinum resistance temperature signal of flow signal, pressure signal, temperature signal and the detection of steam low discharge carries out mould/number conversion through the analog-to-digital conversion module, behind the input computer chip, and the instantaneous delivery that calculates;

Supporting in the low discharge logical operation is vortex shedding flow meter, as supporting be differential pressure flowmeter, then change 0.3 into and judge 0.1;

In the low discharge logical operation, the coefficient in the formula, vortex shedding flow meter must not surpass 0.05, and differential pressure flowmeter must not surpass 0.08;

q _MaxThe design maximum range of expression flowmeter;

Fig. 4-1, Fig. 4-2, be the utility model heating network steam flow integrating instrument circuit theory diagrams;

Embodiment

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Embodiment:

As Fig. 1, shown in Figure 4, heating network steam flow integrating instrument, comprise STC89C516RD+ singlechip chip, analog-to-digital conversion module (A/D), signal input interface module (the signal input among Fig. 1), the signal input interface module links to each other with computer chip through the analog-to-digital conversion module; The signal input interface module is connected to a low discharge and detects platinum resistance, embeds three amount (low discharge of steam, low discharge, super flow) computing modules in computer chip.Remaining part and annexation thereof are same as the prior art.

During practical application, connect the utility model heating network steam flow integrating instrument as shown in Figure 2 in heating network, connected mode is same as the prior art.Just, the low discharge in the utility model detects the gas-distributing cylinder that platinum resistance will be connected to inlet valve 6 back of user's operation.Low discharge detects platinum resistance when flow meter signal be " 0 ", through after the regular hour, if the temperature of this point fails to drop to setting value, then illustrate pipe network at this moment still to user inside pipe network in the mode of low discharge at steam supply.

The user is when stopping to use vapour, necessary tight closing inlet valve 6, size according to the pipe network system of user back, through behind the corresponding setting-up time, the temperature of this point must drop to corresponding setting value, otherwise illustrating still has steam replenishing in user's the pipe network, and this moment, the utility model heating network steam flow integrating instrument began to detect after through the time of setting, and the computing of integrated flow is carried out in the setting of follow procedure.

The working method of heating network steam flow integrating instrument is as follows: flow signal (vortex shedding flow meter or differential pressure flowmeter signal, be meant the steam flow signal), pressure signal (pressure unit signal), temperature signal (temperature platinum resistance signal) and steam low discharge detect the standard signal of 4～20mA that special-purpose low discharge detects the platinum resistance temperature signal after the analog-to-digital conversion module is carried out mould/number conversion, the input computer chip.Three amount computing modules are judged the flow of steam, according to the virtual condition of steam flow, are carried out conventional effective discharge, low discharge, low discharge or the super flow accumulation of steam by existing conventional flow effective discharge computing module or three amount computing modules.Wherein: conventional effective discharge integrating is a prior art.

As shown in Figure 3, heating network steam flow integrating instrument integrating workflow is as follows:

Whether 1, at first detect the flow signal of flowmeter, (be that the vortex street table is 10%～100%q of range within the effective range of the set range of heating network steam flow integrating instrument if flow, is then judged steam flow in respect of flow q _MaxBetween, differential pressure flowmeter is 30%～100%q of range _MaxBetween), heating network steam flow integrating instrument will carry out the calculating (conventional effective discharge integrating) of integrated flow by the instantaneous delivery q of actual displayed this moment;

If 2 flows are in respect of instantaneous delivery q, but the maximum range q of excess flow meter _Max, then this moment, heating network steam flow integrating instrument was pressed q _Max+ (q-q _MaThe computing formula of) * 5～10 is carried out the calculating of integrated flow as the instantaneous delivery of flowmeter this moment;

If 3 flows are in respect of instantaneous delivery q, but not enough flowmeter maximum range q _Max10% (vortex shedding flow meter) or 30% (differential pressure flowmeter), then this moment instrument press 0.1q _Max(vortex shedding flow meter) or 0.3q _MaxThe instantaneous delivery of (differential pressure flowmeter) carries out the calculating of integrated flow;

4, if the flowmeter instantaneous delivery reduces to zero, from reaching null value, heating network steam flow integrating instrument picks up counting and begins to detect the low discharge detection temperature that platinum resistance reflected that is loaded on user's inlet valve 6 back, according to onsite user's pipe network system size with use the enthusiasm condition, contrast is initialization system overheated zone and saturation region temperature fall time t:20～60min in heating network steam flow integrating instrument in advance, temperature T: 70～110 ℃, in the time of setting, drop to the temperature of setting, then heating network steam flow integrating instrument does not measure, and temperature fails to drop to setting value in the time of setting, and then heating network steam flow integrating instrument will be by design maximum range q _Max3～5% (vortex shedding flow meters) or 3～8% (differential pressure flowmeters) carry out the calculating of integrated flow as instantaneous delivery, heating network steam flow integrating instrument stops metering when dropping to the limit value that temperature sets.

Claims

1. a heating network steam flow integrating instrument comprises computer chip, analog-to-digital conversion module, signal input interface module, and the signal input interface module links to each other with computer chip through the analog-to-digital conversion module; It is characterized in that:, the signal input interface module is connected to a low discharge and detects platinum resistance, embeds three amount computing modules in computer chip.