燃气计量撬 / CNG 减压计量撬Metering skid / CNG metering skid
以计量为核心功能的撬装单元，兼顾调压与切断，用于贸易结算、企业内部核算与过程监控。Metering-centred skid with regulation and shut-off, for custody transfer and internal accounting.
产品概述Product overview
计量撬的选型难点不在流量计本身，而在“流量范围”和“结算方式”。用气有大小月、昼夜差异大的场合，单一流量计的量程比往往撑不住，需要双表并联或宽量程比表；贸易结算还要考虑温压补偿、整流直管段与检定证书。泰燃在 200 Nm³/h 燃气计量撬（HBTR-NG/200）与 300 Nm³/h CNG 减压计量撬（RTQ300/250）上都按实际用气曲线定表，而不是按管径配表。Meter selection turns on rangeability and settlement method, not pipe size; units are sized to the actual demand curve.
撬上典型顺序：过滤 → 切断 → 调压（CNG 场合含两级减压与换热）→ 整流 → 计量 → 出口。仪表信号可上传至用户 DCS 或能源管理平台。Filter, shut-off, regulation, straightening, metering, outlet; signals can go to DCS or an energy platform.
工作原理：计量为什么必须和调压一起做Working principle: why metering belongs with regulating
计量撬把调压、过滤、计量、切断与远传做在一个底座上。之所以强调“一起做”，是因为计量精度对上游流态极其敏感：调压器出来的气流如果还有旋涡、脉动或压力波动，表就会读偏，而且偏差是系统性的，不是偶发。A metering skid combines regulation, filtration, metering, shut-off and telemetry on one base. The reason they belong together is that accuracy is highly sensitive to upstream flow condition: swirl, pulsation or pressure ripple leaving the regulator biases the meter systematically, not occasionally.
因此直管段、整流器与取压位置不是“可有可无的细节”。涡轮与超声波表对直管段要求不同，罗茨表对脉动更敏感；这些要求在方案阶段就要落到图上，现场再补装整流器往往来不及。Straight lengths, flow conditioners and tap positions are therefore not optional detail. Turbine and ultrasonic meters have different straight-length needs, and Roots meters are sensitive to pulsation; these belong on the drawing at design stage — retrofitting a conditioner on site rarely works.
计量还涉及贸易结算：表要检定、要有检定证书、要有封缄；数据要能远传并能追溯。计量撬的价值就在这里——它把“设备”做成了“可结算的节点”。Custody transfer adds its own requirements: calibration, certificates and seals, with data remotely transmitted and traceable. That is the value of a metering skid — it turns equipment into a billable node.
结构组成What is on the skid
核心优势Why this design
- 按曲线选表：按实际用气曲线定量程比，避免小流量不计量。Meter sized to the demand curve.
- 结算可用：配温压补偿与检定证书，可用于贸易结算。Custody-transfer ready with compensation.
- 一体交付：调压与计量同撬，减少接口。Regulation and metering on one skid.
- 数据可接：标准信号上传用户平台。Standard signals to user platform.
产品实拍Product photos
计量撬 · 计量段与直管段Metering skid — metering run 点击图片放大查看。 Click to enlarge.
技术参数Technical data
| 型号示例Model | HBTR-NG/200 · RTQ300/250HBTR-NG/200 · RTQ300/250 |
|---|---|
| 额定流量Flow | 200 / 300 Nm³/h200 / 300 Nm³/h |
| 介质Medium | 天然气 / CNGNatural gas / CNG |
| 进口压力Inlet | 管道 0.2–0.4 MPa；CNG ≤ 20 MPa0.2–0.4 MPa; CNG ≤20 MPa |
| 出口压力Outlet | 按用户设定As specified |
| 计量精度Accuracy | 1.0 / 1.5 级（按表型）Class 1.0 / 1.5 |
| 信号Signals | 4–20 mA / RS485，可远传4–20 mA / RS485 |
表中为该系列典型配置。项目流量、介质与进出口压力不同时按工况单独设计，参数以合同技术文件为准。Typical configuration; units are engineered per duty and the contract data sheet governs.
选型与计算要点Selection points
适用工况Typical duties
适合什么工况，什么情况不适用Where it fits, and where it does not
这套设备适合Best for
- 计量段独立成撬，便于检定与比对Standalone metering run, easy to verify
- 直管段与整流按计量要求配置，精度有保障Straight run and conditioning to metering rules
- 数据可远传，支持结算报表Remote data for settlement reporting
- 可与调压撬拼装，减少占地Can be combined with a regulating skid
需要提前确认的边界Check before ordering
- 上游流态不稳会影响精度，需保证直管段Unstable upstream flow hurts accuracy; straight run required
- 不同计量原理对介质洁净度要求不同Each metering principle has its own cleanliness limit
- 检定周期与资质由当地计量机构规定Verification cycle set by the local authority
标准配置Standard configuration
以上为常规配置，实际随机组按工况与用户管网条件确定，可按需增减。Standard scope shown; final scope is set by duty and network conditions, and can be adjusted.
主要零部件Main components
零部件的品牌与型号按项目技术要求与用户指定品牌确定，页内不限定具体厂家。Brand and model are fixed by project specification and the user's approved vendor list.
常见问题FAQ
计量偏差大是什么原因？Why is the error large?
先查直管段与流态，再查温压补偿参数是否设置正确，最后才是表本身。多数偏差来自安装与参数，不是表坏了。Check straight lengths and flow condition, then the compensation parameters, and only then the meter. Most error comes from installation and settings.
表需要多久检定一次？How often is the meter calibrated?
按计量法规与贸易结算要求执行，检定周期与表型、用途有关；检定证书要留存并可追溯。Per metrology rules for custody transfer; the interval depends on type and duty, and certificates must be retained and traceable.
可以一台表覆盖全部流量吗？Can one meter cover all flow?
量程比足够时可以。若最小流量远低于表的下限，会出现“小流量不计量”，此时应做双表并联或选宽量程表。If the turndown covers it. Where minimum flow falls below the meter's lower limit the small flows go unmeasured — use parallel meters or a wider-range type.
压损大怎么办？How to reduce pressure loss?
检查过滤器是否堵塞、管径是否偏小、表型是否选得过大或过小。压损过大既浪费能量，也会影响下游压力。Check filter fouling, pipe sizing and whether the meter is wrongly sized. Excessive loss wastes energy and disturbs downstream pressure.
停电后数据会丢吗？Is data lost in a power cut?
正规配置有本地存储与后备电源，短时停电不丢数据。采购时要写清存储容量与断电保持时间。Proper configurations store locally with battery backup, so a short outage loses nothing. Specify storage capacity and retention time in the purchase contract.
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