Transcript Document

Development of 1 MeV electron
accelerator with beam power up to 500
kW for flue gas treatment
Nikolay Tolstun
D.V. Efremov Research Institute of Electrophysical Apparatus
(FGUP NIIEFA)
Research and Practical Conference “Accelerators and Radiation technologies for the Futures of Russia”
28-29 September 2012, Saint-Petersburg
Description of the solution and technology
(no more than 3 slides)
Method of electron beam flue gas treatment (EFBGT) allows to remove simultaneously sulfur
and nitrogen oxides from the flue gases. It is based on the oxidation of both pollutants and their
reaction with water to form acids. The acids are neutralized with gaseous ammonia to form the
solid aerosol, a mixture of ammonium nitrate and sulfate, which is popular nitrogen-bearing
component of NPK (nitrogen, phosphor, potassium) fertilizer. The method is well known and is
implemented in pilot installations and in industrial scales.
Fig. 1. Scheme presenting sequence of
physicochemical reactions which lead to
acidic pollutant removal and solid fertilizer
particle formation.
Fig. 2. Dependence of SO2 and NOx
removal efficiency from the EB dose.
Research and Practical Conference “Accelerators and Radiation technologies for the Futures of Russia”
28-29 September 2012, Saint-Petersburg
•
Above technology most successfully has been applied in EPS Pomorzany, Szczecin, Poland
in 2002 . The installation purifies flue gases from two Benson boilers of 65MWe and
100MWth each. The maximum flow rate of the gases is 270,000Nm3/h and the total
beam power exceeds 1 MW (for 4 accelerators). There are two reaction chambers with
nominal flow gas rates of 135,000Nm3/h. Each chamber is irradiated by two accelerators
(260kW, 700 keV) installed in series. The applied dose is in the range of 7–12kGy. The
removal of SO2 approaches 80–90% in this dose range, and that of NOx is 50–60% . The
by-product is collected by the electrostatic precipitator and shipped to the fertilizer plant.
•
More wide spreading of technology is restricted by absence of reliable and powerful
electron accelerators. In process of development of 1 MeV, 500 kW accelerator we have
reached 400 kW power level and now we are sure that the accelerator main technical
solutions allows to build such machines for 700-800 power level but in the same time now
we know that some other systems (beam extraction devise, power regulator) should be
reconstructed in order to achieve planned or higher beam power. Efficiency of
transforming electric energy into EB reached 90% at 400 kW level. Note, that the size of
the accelerator with beam power for 700-800 kW will be practically the same as for 500
kW machine. We estimate necessary additional funding to bring the accelerator for
industrial level of reliability as 500 k$.
28-29 September 2012, Saint-Petersburg
1 – irradiator
2 – magnetic lens
3 – scanning
device
4 – ion pump
5 – outlet window
18.07.2015
28-29 September 2012, Saint-Petersburg
«Electron-23» accelerator for environmental application
№
Parameter
Value
1
Accelerating voltage, MV
2
Instability of the accelerating voltage, %
3
4
Electron beam current, mA
Beam current instability, %
5
Rated power of the accelerator, kW
6
Scanning length of electron beam, cm
7
Non-uniformity of current density, %
±10
8
Beam scanning frequency, Hz
≥400
9
Beam conversion efficiency at the rated power, %
≥90
10
Annual error-free running time, %
≥90
28-29 September 2012, Saint-Petersburg
0,8-1,0
±5
400-500
±2
500
200-240
5
The most advanced and world leading company in the flue
gases radiation treatment now is Institute of Nuclear Chemistry
and Technology, Warsaw, Poland.
Our Institutes has long and stable relations.
28-29 September 2012, Saint-Petersburg
Market
The market for the product are the coal and oil burning electric power
stations with flow rate of the flue gases from 50,000 Nm3/h to 1000
Nm3/h (40-1000 MW electric or thermal).
1. ARAMCO, Saudi Arabia – actively studies possibility to use this
technology.
2. Sheep building companies with powerful diesel engines are interested
in the product.
Demand on our product will depend on national ecological policy in
different countries. In conditions of EFBGT commercial scale
implementation demand in global market may be as high as tens of $
billion.
28-29 September 2012, Saint-Petersburg
Investor of the project realization (implementation)
We are ready to cooperate with any company or other
organization to promote powerful electron beam driven
technique for ecological needs .
Research and Practical Conference “Accelerators and Radiation technologies for the Futures of Russia”
28-29 September 2012, Saint-Petersburg