What is refractory guelle mixture

Farm manure for biogas plants: slurry & manure

The manure and manure have great potential for energetic use in a biogas plant. Fermentation produces high-quality biogas that is converted into electricity and heat. In this way, the operator not only met the increased environmental requirements, but also earned hard cash with manure and manure at the same time. And the digestate is then still a high-quality natural fertilizer.
This article was created by:
Christian Märtel, editor www.Heizungsfinder.de
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Heating ⯈ CHP ⯈ Biogas plants ⯈ Liquid manure & manure

Biogas from liquid manure & manure: cattle manure, pig manure and horse manure

In view of the ever larger breeding farms and the increasing environmental requirements for further use, biogas production offers an interesting opportunity to use liquid manure and manure profitably. Regardless of whether horse manure or poultry manure, cattle manure or pig manure - they all have one thing in common: They are ideally suited for fermentation in a biogas plant. They still have so many nutrients that they are ideal for biogas production.

Which is better - manure or manure?

In principle, it should be noted that manure is much easier to process and store than manure. Because not only their good nutrient content, but also their pumpability make cattle manure and pig manure the ideal substrate for biogas production. It can also be mixed with other substrates (co-substrates) for fermentation in the fermenter of a biogas plant.

The low dry matter content (DM) of the manure makes this possible. If you add corn silage or other biogas substrates, the biogas yield and thus the methane yield of liquid manure are increased even further. Poultry manure, horse manure and other types of manure also require special transport options from the biogas plant's preliminary pit.

Manure and manure yield from cattle, pigs and horses

If the pumpability of liquid manure speaks for its use in biogas plants, then liquid manure and manure differ considerably in terms of their quantity. A cattle produces between 7.5 and 21 m³ of manure per year, pigs only between 1.2 and 6 m³ of manure, horses around 16 m³ of horse manure (source: FNR). In order to produce the same amount of substrate, different sized herds of animals have to be kept.

Pig manure vs. cattle manure

Fresh manure filling into an open manure silo | Author: Moehre1992 |
License: CC BY-SA 3.0

Biogas is created from the fermentation process of nutrients such as fats, carbohydrates and proteins. The two substrates, cattle manure and pig manure, differ significantly in their basic composition. This means that the biogas yield is not the same either.

Cattle manure has a high proportion of carbohydrates, while pig manure has a high proportion of proteins. Since the proteins produce a higher methane content in the biogas, the biogas yield and methane yield are noticeably higher in pig manure.

That brings manure and manure from pigs, cattle and horses

As a rule of thumb, biogas production produces an average of 25 Nm³ (standard cubic meters) of biogas (methane content 60%) per tonne of cattle manure, 28 Nm³ biogas for pig manure (methane content 65%) and 63 Nm³ of biogas for horse manure without straw. Since the methane yield with proteins is much higher, an average of 210 Nm³ methane is used for one tonne of cattle manure and 250 Nm³ for pig manure, but only 165 Nm³ for horse manure.

The values ​​of cattle manure and pig manure are even higher than those of liquid manure with almost the same methane content. With a biogas yield of 45 Nm³ per ton of cattle manure and 60 Nm³ per ton of pig manure, the biogas yield is on average twice as high as with pig manure and cattle manure. (Source: FNR)

In practice, however, these values ​​are often lower. Because the result depends on the extent to which the manure is diluted by cleaning the stall or milking parlor.

In addition to liquid manure and manure, biogas can be obtained from three other groups of raw materials: biogas from renewable resources, biogas from agro-industrial waste and biogas from compost from landscape maintenance.

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Experiences & questions on the subject of CHP units

Oil consumption of a CHP

How much oil does an electricity-generating heating system, e.g. a CHP unit, use? With about 270m² of living space on 3 floors (a family house) it was about 3500 liters / year. valued at the oil boiler.
Answer from BAD | HEATING | SOLAR | SANITARY | HOUSE TECHNOLOGY WENDEL

Hello everybody,
the question What oil does a CHP unit consume?
There are several bases for the consumption of oil.
Area, year of construction, requirements of the operator in terms of living space temperatures.

I am very happy to sell and install CHPs. But only where it makes sense.
With the area of ​​270m² and no heated pool. Remove the CHP unit from your list.
If you have a new oil condensing boiler installed with solar, you have more.

Greetings Robert Wendel
Heating Sanitary

Advantages and disadvantages: intelligent heating sword

I'm interested in the advantages and disadvantages of an intelligent heating sword. What is your experience with it?
Answer from GO BHKW GmbH

I consider these solutions to be economic nonsense. The amount of heat that heats the house is usually generated with gas or oil, here one kWh costs 5-7 cents. If I now use a kWh of PV electricity that I do not want to feed in for heating purposes, I save 5-7 cents, but lose at least 12.31 cents feed-in tariff. So such solutions produce a loss of more than 5 cents.

Kind regards
Thomas Deus

New heating for old farmhouse

Heating for old farmhouse (listed), approx. 280sqm: which heating is available and what costs should be expected?
Answer from Buderus Germany

Hello, we offer a tool in which different variants are calculated. https://www.buderus.de/de/heizsystemberater
It is also decisive which energy source (natural gas, electricity for heat pumps or pellets) is to be used, i.e. it should be checked whether natural gas is available. Should a stove be used? Is there a chimney or fireplace available? Do you want to install underfloor heating? A hybrid system, i.e. a combination of different forms of energy, would also be conceivable.
E.g. gas condensing boiler with connection of a fireplace and solar system.
GBH192i as a hybrid model https://www.buderus.de/de/produkte/catalogue/alle-produkte/8089_logamax-plus-gbh192it

The heating of the future

Which heating is sensible and affordable for the future?
Answer from Porzel Energie and Warenhandel UG

I think in the future it will be the fuel cell. e.g. fuel cell heating
Vitovalor PT2

Are there alternatives to gas floor heating?

I have a gas combination heater in a condominium in a multi-storey apartment building. Although this is well under 10 years, it fails once or several times annually and despite annual maintenance (contract). From this I conclude: Either Buderus only builds inferior heating systems (these are hardly ever actively offered by professional trades but only on request) or gas heating technology is simply outdated, unstable and vulnerable. I am therefore looking for useful alternatives for a difficult scenario: there are several heaters hanging on the chimney, so it is technically not possible to use a gas boiler. Solar on the roof is not possible. Insufficient cellar to store fuel. The ideas I have in mind are either nano-CHP or pure electric heating (but not night storage heaters like in the 50s). The water should be heated in some way, boiler is not possible due to lack of space. Piping in the form of standard radiators is available through the entire apartment. What options are there with a very rough cost estimate?
Answer from ALX Haustechnik GmbH

Actually, the solution you have today is a good one. The heater actually runs without any problems, you should evaluate the previous errors once to get an opinion. In your case, I would advise you to stick to gas heating, as electric heating is an alternative.
It is therefore advisable to look at the case on site to find the solution.

Is fuel cell heating worthwhile in a single-family home

What infrastructure do I need to be able to install fuel cell heating for a single family home? When is fuel cell heating even worthwhile for a single family home? What funding can I apply for?
Answer by Gerhard Mayr

Only with a grant

CHP as an alternative to night storage heating?

Find an alternative to electric heating. I currently pay 265 euros a month - only for the electricity for the night storage heater. What is the best alternative? I am also interested in a CHP unit - the only question is which costs arise or how financing is possible?
Answer from JB heating electrical plumbing

The only real alternative is to switch to gas heating. Here the heating costs would only be around a quarter of the current costs. So at around 80 euros a month. Just the day before yesterday we completed such a system. In the RWE / Westnetz area, gas connections are currently available for EUR 0.-. The KFW subsidizes such a measure with 15% (when applying in 2018)
Alternatively, you can also finance the whole thing through KFW at around 0.9% per annum with 100% payout over 10 years through KFW
PS: The whole changeover only took 7 days, the customer is completely thrilled (finally everything is really warm :-))
Call me if you are interested!

Replace the old heater with a fuel cell?

We own a 15 kw. Vaillant natural gas heating, installation 1983, exhaust gas loss according to chimney sweep measurement currently 4.5! However, the timer is defective & there is supposedly no replacement. The control is therefore currently operated with the "Sun" symbol. The heating is currently switching on & off at random. The after-heating of the hot water boiler is still working. The temperature display on the boiler is permanently set to zero. Question: Because the heating, due to the optimal exhaust gas loss (4.5), in my opinion could still be operated at least until the heat exchanger is defective, because in fact there is "only" a defect in the control. Does the purchase of a fuel cell heater make sense now? I am not aware of current prices. I ask for an honest & objective answer that does not aim to necessarily sell a new heater. I have an east-west PV system with 8.74 kWp
Answer from Görtz

A boiler must be replaced at the latest after 30 years. With an output of 15 kW and a PV system, a fuel cell with costs of € 35,000 is rather uneconomical.

Installation of absorption chiller for CHP

We are interested in the subsequent installation in the context of CHP of an absorption chiller in which the heat generated by the existing CHP (year of construction 2016 type RMB NeoTower 1236, output 16 KWh) is converted into cold. Who can help us? What do we have to consider?
Answer from Ing. Pless Motor Service

In order to make detailed statements, the overall system with heating and cooling consumption must be considered.
For information in advance, I recommend visiting system providers of absorption and adsorption chillers on the Internet.
I know a system where the thermal energy of the CHP (20 KWel) is used -only- for the adsorption chiller (SorTech).

In any case, a profitability analysis with a comparison of both systems for the compression refrigeration machine should be carried out in order to determine whether the framework conditions for an economic use exist.

CHP + power storage / electric car / photovoltaics?

We have a CHP from 2009 (Dachs G 5.5). We use this to produce around 15,500 kWh of electricity per year. 13,200 kwh are fed in, so we use 2,300 + 3750 kwh ourselves, which we have to buy from an energy producer. We are currently a 6 person household. In the short to medium term, it would be considered to buy an electric car with which about 30tkm p. a. should be covered. Against this background and the question of self-sufficiency, I ask myself how far it is, among other things. Is it also economically sensible to invest in a) an electricity storage system and b) if necessary to couple this directly with a PV? In order to get a well-founded answer, what further information is required?
Answer by Christel Hobbs Priental EnergieSysteme

It's an excellent plan. You don't get a lot for feeding in from the CHP. Just a few cents. But pay at least 30 cents for every kWh you use. Storage would quickly pay for itself. Just one question. What's in
Summer? Will the CHP also run then? If not, a small PV system would make sense. I congratulate! You could be completely self-sufficient! The thought makes my heart leap for you. I would also very much like to know your experience with the CHP unit.

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