Please don't burn lignite, also known as brown coal, also known as peat. It produces a lot of harmful tars, sulphur, and nasties that will, not may, damage your stove and chimney, and put out into the atmosphere lots of very unpleasant heavy metals and poisons, plus leaving the same in the ash. Because of its moisture content and contaminants it is a poor inefficient heating medium.
It is heavily used in the EU/parts of the US, for power production, with associated surrounding area pollution, quite apart from the environmental impact of the strip mining.
I am not burning lignite coal or peat. The "lignite briquettes" are
not actually lignite coal...... they are manufactured from wood waste and they are a low-tar, low sulphur fuel for use in woodburners/multifuel stoves. Here is the stuff:
https://www.djdaviesfuels.co.uk/shop/firelite-lignite-briquettes-20kg
I think they call them that because they are made from wood. They were recommended specifically by our stove fitter/sweep as they are low sulphur and burn clear with no tar. Basically compressed wood- more compressed than the usual wood waste briquettes.
You cannot buy lignite (brown) coal in UK these days, in fact I don't think you can buy ordinary housecoal any more, all solid fuels must be clean burn (unless of course you do the "environmentally friendly" thing and salvage old wood of dublious provenance and burn it damp.....

). The selection of solid fuels from the local retailer is quite a strict range: no house coal, only smokeless fuels, manufactured low emission briquettes and kiln-dried wood.
Arguably, multifuel stoves (my "log burners" are actually multifuel stoves) are rather more acceptable than woodburners, as the newer ones when used with "approved" fuel (which is all you can buy from reputable solid fuel retailers these days) burn very cleanly. The particulates come from older woodburners especially when using wood that is not dry enough.
I am well aware of the lignite coal issue, not just lignite but also the other types of high-volatile coal burned around the world to generate power e.g. in Germany.... or China.... [places our manufacturing goes due to our artificially high UK energy bills- all in the name of net zero.... madness!]
Incidentally, the Anthracite mined in south Wales is the cleanest and lowest sulphur in Europe if not the world. It is such good quality that most production from the small drift mine goes to make filters for desalination plants- only a small amount is available in the local area as solid fuel. (I can attest to how clean it is, hardly any clinker and a very clean burn with little ash). That's why the mine has survived.
GC