00:00:11.520 [Music] 00:00:15.03000:00:15.040 as growers of lisianthus chrysanthemums 00:00:18.28000:00:18.290 and other flowering plants 00:00:19.69000:00:19.700 LF Geeta and Sons in lace tynin Suffolk 00:00:22.33000:00:22.340 have been producing high-quality cut 00:00:24.60900:00:24.619 flowers for the wholesale market for 00:00:26.65000:00:26.660 three generations with a glass house 00:00:31.99000:00:32.000 area of 1.6 Hector's requiring 220 00:00:35.61900:00:35.629 kilowatt hours of heat per square metre 00:00:37.57000:00:37.580 fuel input demand is approximately 4.5 00:00:41.04900:00:41.059 million kilowatt hours so energy costs 00:00:43.84000:00:43.850 have always been a major consideration 00:00:46.38000:00:46.390 we were burning natural gas and the 00:00:49.42000:00:49.430 price suddenly jumped up by an enormous 00:00:52.36000:00:52.370 amount the economics were looking 00:00:54.88000:00:54.890 totally dire and we just looked around 00:00:58.78000:00:58.790 for an alternative we realized there's a 00:01:01.89900:01:01.909 lot of straw in this area being the 00:01:05.01000:01:05.020 probably most productive area for 00:01:07.42000:01:07.430 cereals in the country and we decided to 00:01:10.93000:01:10.940 have a look at that as a possibility it 00:01:13.42000:01:13.430 has a good calorific value and it's 00:01:15.24900:01:15.259 readily available and in mr. Gita's case 00:01:17.52900:01:17.539 it is quite literally on his doorstep in 00:01:21.24900:01:21.259 early 2007 mr. Gaeta installed a 1.2 00:01:24.81900:01:24.829 megawatt linker straw boiler a portal 00:01:29.31900:01:29.329 frame building of 750 square metres was 00:01:32.44000:01:32.450 purpose built to house the boiler and 00:01:34.02900:01:34.039 feed system as well as providing dry 00:01:36.42900:01:36.439 storage for the fuel keeping that straw 00:01:39.66900:01:39.679 that raw material dry is of paramount 00:01:41.88900:01:41.899 importance 00:01:42.81900:01:42.829 if the straws damp it will not generate 00:01:45.27900:01:45.289 sufficient heat his boiler will not run 00:01:47.55000:01:47.560 efficiently 00:01:51.62000:01:51.630 the wheat or rape straw is delivered as 00:01:53.67900:01:53.689 550 kilogram heston bales which each 00:01:56.84000:01:56.850 contain roughly 2250 kilowatt hours of 00:02:00.32000:02:00.330 energy these are directly harvested from 00:02:02.99000:02:03.000 the neighboring area and the store 00:02:04.63900:02:04.649 contains enough fuel for three to four 00:02:06.83000:02:06.840 months operation the bales are loaded 00:02:11.80900:02:11.819 onto a conveyor belt which can hold up 00:02:13.43000:02:13.440 to 15 at once this is equivalent to 18 00:02:17.47900:02:17.489 hours worth of fuel in peak heating 00:02:19.61000:02:19.620 season the bales move along the belt to 00:02:23.09000:02:23.100 the feeder where the straw is shredded 00:02:25.18000:02:25.190 it's then blown pneumatically through a 00:02:28.13000:02:28.140 cyclone system to the rear of the boiler 00:02:31.80900:02:31.819 where it's carried by an auger directly 00:02:34.94000:02:34.950 into the combustion chamber where it's 00:02:36.83000:02:36.840 burned 00:02:40.09900:02:40.109 the heated water is pumped to a 140 00:02:43.38000:02:43.390 cubic metre thermal storage tank from 00:02:46.14000:02:46.150 where it's distributed to the glass 00:02:47.61000:02:47.620 houses the thermal store is used to help 00:02:51.53900:02:51.549 manage the demands for heat on the 00:02:53.30900:02:53.319 biomass boiler as this works more 00:02:55.44000:02:55.450 efficiently when operating continuously 00:02:57.33000:02:57.340 at or near its maximum capacity the 00:03:01.77000:03:01.780 thermal store not only smooths out peaks 00:03:04.08000:03:04.090 and troughs in the daily heat demand it 00:03:06.72000:03:06.730 also enables the size and therefore cost 00:03:08.91000:03:08.920 of the biomass boiler to be kept much 00:03:11.22000:03:11.230 smaller than would otherwise be possible 00:03:13.64000:03:13.650 the boiler itself is sized to about half 00:03:16.44000:03:16.450 the maximum heating demand of the 00:03:18.86900:03:18.879 nursery so during the day when the heats 00:03:20.97000:03:20.980 not required heat starting the storage 00:03:22.83000:03:22.840 tank and then used on an evening where 00:03:24.86900:03:24.879 the boiler heat it and they tank hated 00:03:27.36000:03:27.370 it combined combustion of the straw 00:03:30.39000:03:30.400 generates ash however due to the 00:03:32.90900:03:32.919 efficiency of the system this is a 00:03:34.64900:03:34.659 relatively small amount and it's 00:03:36.47900:03:36.489 automatically removed mr. Geetha gets 00:03:40.19900:03:40.209 something like a box of that ash 00:03:42.17900:03:42.189 material per week out of this boiler 00:03:44.84900:03:44.859 that's all I think then spread that back 00:03:47.39900:03:47.409 on the land so is returning a bit of 00:03:48.93000:03:48.940 nutrients back to the soil a system such 00:03:53.39900:03:53.409 as this and we're looking at a 1.2 00:03:56.08900:03:56.099 megawatt boiler is going to cost in the 00:03:59.03900:03:59.049 region of currently about 375 thousand 00:04:02.90900:04:02.919 pounds I'd includes the boiler conveyor 00:04:05.42900:04:05.439 the shredder the installation of the 00:04:07.86000:04:07.870 system and the cost of that shouldn't be 00:04:09.24000:04:09.250 overlooked of course and a considerable 00:04:11.58000:04:11.590 Heat store as well it's not the sort of 00:04:14.99900:04:15.009 thing they go into on a short-term basis 00:04:17.36000:04:17.370 economically yes it's a good thing from 00:04:20.21900:04:20.229 the heating point of view there's no 00:04:22.83000:04:22.840 doubt about that 00:04:23.70000:04:23.710 if we were still on natural gas now we 00:04:27.45000:04:27.460 would be paying 2 and a half times as 00:04:30.18000:04:30.190 much money per year as we are now at 00:04:33.74900:04:33.759 current prices mr. Gaeta will have 00:04:35.73000:04:35.740 recovered his costs within approximately 00:04:37.40900:04:37.419 six years 00:04:43.67000:04:43.680 when you look at the cost of straw and 00:04:46.26000:04:46.270 even the cost of an installation such as 00:04:48.51000:04:48.520 this it's very very competitive 00:04:51.33000:04:51.340 alongside oil or gas which were the two 00:04:54.15000:04:54.160 principal fuel sources for a nursery of 00:04:56.73000:04:56.740 this type and of course the price of oil 00:04:59.13000:04:59.140 and gas is just skyrocketing all the 00:05:01.05000:05:01.060 time it's making biomass equipment by 00:05:05.46000:05:05.470 must boilers biomass heating systems 00:05:07.35000:05:07.360 ever more cost-effective 00:05:09.50000:05:09.510
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