A typical crematory furnace has a power of at least 600 kW. In typical installations the heat generated in burning process goes to the atmosphere with the flue gas.
Depending on the model of the furnace and flue gas system, the flue gas temperature may be similar to post-combustion chamber temperature, that is about 800°C. The hot air is lost permanentely. It’s difficult to recover the energy because the flue gases are aggressive and corrosive – so there are special requirements for the materials of the heat exchanger. Another problem is that the furnace doesn’t work continuously (the transfer of energy into the atmosphere is not stable). Moreover, there can be a problem with potentially large amounts of energy to recover (up to 250 kW from a single furnace), and a crematorium does not need so much energy for heating the rooms or water.
To sum up, on one hand we have the opportunity to get a lot of energy through the heat exchanger, which is a special one adapted to irregular work, and on the other hand there is no recipient of the heat.
A serious problem is the attitude of the society towards the cremation process, which results in building the crematoriums far away from the other houses and general disagreement with recovering the heat from crematory kilns. The last problem for the investor is that he should consider all the costs of maintenance and technical service of the heat exchangers. of the economic costs of maintaining and servicing such a system. That is why if there is no need for heat recovery systems that would be expressed in the law (to reduce temperature of the flue gases, filtration systems, energy law), in general crematoriums are not interested in these solutions.
In our offer there are several heat recovery systems:
- heat recovery as hot air – SAE system, used to reduce fuel consumption or to heat large areas (churches, chapels, sports halls, etc.),
- heat recovery as hot water (in larger installations also as steam) – used for hot water and central heating.
Before investing in heat recovery system, in every case we prepare a business plan. We can offer the project and realization of heat recovery system according to the investor’s needs and requirements.
Additional filtration systems
There are areas with stricter environmental norms, where the filtration based on post-combustion chamber is not enough.
Depending on particular regulations, there can be a need of reducing some parameters, for example, nitrogen oxides NOx, sulfur dioxide SO2 or particulates. We can easily achieve certain emission parameters with different filtration systems.
Universality of our construction allows us, for each type of furnace during installation or in the future installing additional filtration system. It is possible to install the filtration system in every kiln we offer – not only during its construction but also in the future. The filters should be chosen according to the result we want to achieve (emissions that are required), so it is really important to install them when it is necessary. It reduces the total cost of the investment and operation by cutting down the operating costs of the filters.
Investing in filtration system when it is not necessary does not guarantee that the system will be in accordance with the future regulations related with environmental protection. Using the filtration system require, inter alia, to reduce the flue gas temperature to below 300°C, that is why very often a heat recovery unit is installed as well. If there is no possibility to take advantage of this heat, it’s necessary to install a heat exchanger that transfer the heat to the atmosphere.
Complete filtration system consists of the following:
- chemical filters to reduce the level of nitrogen oxides NOx,
- chemical filters to reduce the level of sulfur dioxide SO2,
- bag filter to reduce the particulates,
- auxiliar equipment – pipes, chimney, fans, chemicals containers, waste containers, heat exchanger, automatic control systems, flue gas monitoring systems.
Internal transport systems
In large crematoriums with several furnaces which make dozens of cremations daily, an important element is a system of internal transport that ensures the highest ethical standards and sanitary regulations.
In this kind of building there is a transfer of bodies from refrigerators to ceremony halls/chapels and then to the kilns areas. The movement of the coffin must be separated from the mourning procession. In big buildings the transport must be coordinated to prevent it from any possible mistake or delay.
The building must be designed properly, using the automatic means of transport that can be integrated with the insertion systems. It allows us to optimize the work of crematorium and the whole funeral home. As a part of our complex offer, we design and integrate such systems.