HM-1400 TRX total mercury analyzer system

The HM-1400 TRX is a total mercury monitor for fully automatic and continuous measurement of emissions of mercury in flue gas ducts.

Область применения

The HM-1400 TRX monitors not only the performance of the mercury separators by measuring the total mercury concentration, but also reports and registers (also online) any violation of the high limits. As a result it is often possible to intervene directly in the process of the plant to be monitored and thus ensure reliable compliance with the specified limit values.

Areas of application

Waste incineration plants (municipal waste, industrial waste, hospital waste)
Sewage sludge and hazardous waste incineration
Steel plants with scrap metal preparation
Contaminated soil burning plants (thermal cleanup of soil)
Crematoriums
Mercury mines and refineries
Fluorescent light bulb recycling

Approvals

Suitability-tested by the TÜV North, test report 109 GMT007/8000632287 dated 30 June 2011
Certified according to DIN EN 15267-3
Itemized in the list of suitable measuring devices for continuous emission measuring
MCERTS

Дизайн

System components HM-1400 TRX

Sampling system

The sampling system consists of a sampling probe and a sampling line. Both components are heated to 180 °C. With flue gas temperatures < 200 °C, the sampling tube must also be in heated tube design to prevent faulty measurements (lower findings for the mercury concentration measurement due to the absorption properties of HgCl₂).

Gas patch switchover

The sample gas is extracted condensate-free from the exhaust stack with approx. 100 Nl/h and fed via a three-way ball valve to the thermocatalytic reactor. The path switchover is also heated and is operated as component of the measuring device by means of the device control. You can select between sample gas connection, reference connection or zero gas connection.

Thermocatalytic reactor

The total mercury analysis measures not only the elementary metallic mercury that is stored freely in the sample gas or deposited in the materials, but also measures the chemically bonded mercury that is found in the flue gas. The ionic mercury must also be converted into elementary, atomic mercury so that the detector can acquire and evaluate the total mercury. The thermocatalytic reactor carries out this function at a preset operating temperature.

Gas drying

Before the mercury content is determined, the now created sample gas containing Hg⁰ is dried while flowing through a Peltier cooler. At the same time the system pressure and the measured gas temperature are continuously recorded.

Prefilter

Before the prepared and dried sample gas flows through the photometer, it passes through an additional filter with hygroscopic effect to eliminate even lower residual humidity components. This is important first for recording the gas volume flow in dry form and, second, pollution and deposits are avoided in the photometer and the maintenance-free service life increased.

2-beam UV photometer

The sample gas enters the measuring cuvette and is then routed over a selective filter in which the mercury is absorbed. The sample gas thus freed from the mercury then flows through the reference cuvette. The advantage of this cuvette switching is that the entire gas matrix flows through both the measuring cuvette and the reference cuvette and most of the mercury is selectively filtered out before it reaches the reference cuvette. This principle of differential measurement means that the measurement is less sensitive to spectrometric interference components than the single-beam photometer that has only one cuvette. With the cuvette switching of the two-beam device this cross sensitivity for SO₂, for example, only becomes effective after 1000 mg/m³. The measured signal from the photometer is taken over by the internal PLC.

Gas volume flow generation

When the sample gas volume flow leaves the 2-beam UV photometer, it passes through the vacuum pump which generates the gas flow. The volume flow of approx. 100 Nl/h is set manually with the fine regulating valve. The system pressure and sample gas temperature parameters are measured after the gas drying at the photometer, where the mercury is also measured, and are used ultimately to convert the gas volume flow to standard conditions. The mercury concentration as result of a measurement is output as 4 to 20 mA current signal to match the set measuring range of 0 to X µg/Nm³ (dry).

Optional:

Larger measuring range with dilution device
Side-mounted cooling device
Integrated system to generate reference gas
Heated sample pipe 0.6 m, 1.0 m, 1.5 m

Функции

In the HM 1400 TRX total mercury analyzer the sample gas is converted into mercury vapor by a combination of thermal and chemical treatment. It is then continuously measured in a photometer. The sample gas flow is measured after a sample game cooler at 2 °C. The concentration is calculated and displayed as "dry flue gas".

Особенности

Extractive measuring procedure
Low maintenance dry reactor
High operational reliability
Easy maintenance, easy replacement of components
Low cross sensitivities
Easy to read LC display

Технические данные

Measured variable	Total mercury
Measuring ranges	0 ... 45, 0 ... 75 to 0 ... 500 μg/Nm³
Measuring principle	UV absorption
Sample gas temperature	0 ... 250 °C
Sample gas pressure	-50 ... +50 hPa
Duct diameter	> 0.5 m
Ambient temperature	5 °C ... 40 °C
Degree of protection	IP40 (IP54)
Measured value outputs	2 x 0/4 ... 20 mA, 500 Ω
Relative expanded uncertainty	5.5 % CR
Digital outputs	4 relay outputs, permissible load 250 V, 100 VA
Digital inputs	1 isolated input
Detection limit	< 0.1 μg/Nm³
Reference point drift	< 2 % ZRE
Zero point drift	< 0.5 % ZRE automatic zero offset
Supply voltage	230/400 V AC, 50 Hz, 3 x L, N, PE
Measuring instrument	1 200 VA
Sampling probe	650 VA
Sampling line	100 VA/m
Heated sample pipe 0.6 m/ 1.0 m/ 1.5 m	600 VA/800 VA/1 200 VA
Dimensions (H x W x D) control cabinet	1 700 x 800 x 500 mm
Weight	220 kg
Purge air supply, compressed air	6 ... 8 bar (for reference gas generator only)

Дальнейшая информация

A HM-1400 TRX total mercury analyzer consists of, for example:

1 sampling pipe, heated and temperature-controlled, with connecting cable
1 sampling probe, heated and temperature-controlled, with connecting cable
1 sampling line, heated and temperature-controlled
1 measuring device
Operating instructions, service manual, maintenance manual

Please consult your Siemens sales partner for information on how to correctly configure and order a HM-1400 TRX total mercury analyzer for a Siemens CEMS project.