Brovary

Interconnection of the DH network and a new sustainable source – biomass boiler or utilisation of alternative waste heat resource from a nearby industrial plant

Location: Central part of Brovary
Programme: SUDH
Project status: Feasibility Study
Investment: Approx. 7 MEUR
Payback period: Approx. 10-15 years
Reduced gas consumption: Approx. 3 - 7 million m3
Reduced

 CO

emissions:
Approx. 8 000 – 19 000 tonnes/year

Brovary, with 108 000 inhabitants, is located about 25 km East of Kyiv. It is 3rd by the volume of sold industrial products among the cities of Kyiv Oblast.

District heating in Brovary is supplied by the municipal DH company, Brovaryteplovodoenerhiya, which is also a utility company for water supply and sewerage.

Brovary DH Company supplies heat to 73 000 customers. The DH Company operates 26 boiler-houses, supplying district heat to separate DH networks. While being typical for Ukraine, this technical heritage has typical challenges mainly comprising in inability to operate sustainable heating sources as well as longer times required for restoration of heat supply in case of accidents.

About five years ago, the Brovary DH company stopped provision of domestic hot water (DHW) services during summers. This was due to the fact that their DHW tariffs were high and the customers chose to switch to private boilers. Inadequacy of DHW tariffs are explained by inefficiency of running large boilers to supply relatively small load of heat necessary for DHW supply during summer. This inefficiency inevitably leads to higher losses transferred to the customers via the official tariff calculation method applied. More efficient use of boilers requires an interconnected network, which, as already mentioned, is currently not present in Brovary.

The infrastructure for DHW remains operational, however. During heating season, when the demand for heating is higher and use of boilers is more efficient, the DH company has a possibility to offer lower tariffs for DHW. Therefore, during heating season this service is being provided to the customers.

Brovary Demonstration Project

The main idea for the demonstration project in Brovary is to interconnect the central parts of the district heating system. This will allow for taking some plants out of operation and enable introduction of larger production units with sustainable fuels. An interconnected system will also enable the use of a sustainable heating source for an adequate DHW supply during summers. In the central part of the city, the density of buildings is high enough for district heating to be the best options for heating and DHW supply.

During pre-study, two main ideas for sustainable new heat source have been determined: new biomass boiler and/or waste heat resource from a nearby industrial plant. Currently, the plant cools down one of its industrial lines in order to ensure necessarily low temperatures. The released heat is currently aired to the atmosphere. It shall be technically possible to use currently wasted resource for generation of heat. This will require the DH Company to install necessary equipment capable to generate heat from the available alternative resource. If appears possible – this will substitute use of natural gas without adding any new fuel to the system.

The ongoing feasibility study determines technical, environmental and financial feasibility of the project idea, as well as further clarifies the project composition.

Pre-study results

As a result of a pre-study, the following components of an investment project have been preliminarily identified for Brovary:

  1. Interconnection of DH networks (up to 5 km).
  2. Alternative heat source for heating base load and DHW supply during summer:
    a. Alternative waste heat source (warm condensate) from a nearby industry (5 MW);
    b. Biomass boiler (10 MW).
  3. Installation of a flue gas condenser in one of the main boiler houses (1 MW).
  4. Other project components that support conversion from 4-pipe system to 2-pipe system and creation of a demand driven DH system may be added to the project during the feasibility study stage.

The proposed project will lead to interconnection of the major part of the district heating system in Brovary. This will increase system reliability and enable DHW supply from non-fossil fuel source during the summer. The same non-fossil fuel heat source (preferably waste heat and optionally a boiler house) would supply base load to the system during the heating season.

The estimated investments vary between 5 and 7 MEUR depending on the options for the base load source.

Once implemented, the project is expected to benefit the local community by saving 30-75 GWh of heat from gas. Considering that the main source of heat in Brovary is natural gas, this will save 8 000 – 19 000 tonnes CO2 and other emissions per year. Finally, the DH customers will enjoy a more reliable DH with a restored DHW service.

Current status

Preparation of feasibility study (started in June 2020).