Substance of problem
The essence of the problem: about 35 thousand NIISTU-5 boilers are operated in Ukraine, the heating capacity of which does not exceed 0.6 Gcal/h, and the efficiency is 75-80 %. The proposed development provides, through the reconstruction of NIISTU-5 boilers, an increase in their thermal capacity and efficiency. The cost of reconstruction of such inefficient boilers is 3-4 times lower than replacing them with new ones.
Description of technology
Reconstruction of NIISTU-5 boilers is carried out by introducing new design elements, namely: additional convective heating surfaces and new upgraded slot burners (with or without radiators).
There are three options for the reconstruction of boilers:
- installation of single-row additional convective heating surfaces and slot burners without emitters.This provides an increase in efficiency by 10-12 %;
- installation of double-row additional convective heating surfaces and slot burners without emitters. Provides an increase in efficiency and an increase in thermal power by 60-70 %;
- the introduction of slit burners with emitters provides an increase in efficiency by 4-5 %.
The economic effect of the conversion of boilers
|
Number of converted boilers |
Savings from increased efficiency, thousand UAH in year |
Savings from increased efficiency and heat production, thousand UAH in year |
|
1 |
10,8 |
18,86 |
|
2 |
21,6 |
37,71 |
|
10 |
135,0 |
215,23 |
|
50 |
702,0 |
1103,98 |
|
100 |
1411,4 |
2211,83 |
|
1000 |
14168,3 |
22198,91 |
When reconstructing one boiler of the NIISTU-5 type, with a heating capacity of 0.585 Gcal / h and an efficiency of 80 % with an increase in heating capacity of up to 1 Gcal / h and an efficiency of 91.34 % (option A), or with an increase in efficiency of up to 90 % without increasing heat output (option B) such indicators are achieved.
| Indicators | Option A | Option B |
| Gas saving, m³/year | 46177 | 23969 |
| Reducing the amount of harmful gaseous emissions: | ||
| – Nitrogen oxides, kg/year | 96,82 | 50,3 |
| – Carbon oxides, kg/year | 91,88 | 47,7 |
| – Carbon dioxide kg/year | 90224 | 46832 |