CN102944003A - Heat supply system combining tobacco seedling with tobacco baking - Google Patents

Abstract

The invention discloses a heat supply system combining tobacco seedling with tobacco baking, which comprises a boiler room part, a seedling greenhouse part and a centralized heating and baking room part, wherein the boiler room part comprises a boiler body, a preheater, a power distribution cabinet, a coal feeder, an air distributing cylinder, a water softener, a softened water tank and a water supply pump; the seedling greenhouse part comprises a gas-water heat exchanger, a water circulating pump, a water distributor, a main water inflow pipe, a water inflow pipe branch, a main water outflow pipe and a circulating water tank; and the centralized heating and baking room part comprises a master steam pipe, a steam sprayer, an electric ball valve, a steam heat exchanger, a manual valve, a catch basin, a steam trap, a drain valve and a main water return pipe. The system provided by the invention can effectively reduce the equipment investment and the running cost of the tobacco seedling and the tobacco baking, improve the growth quality of tobacco seedlings and the baking quality of the tobacco, decrease the fuel coal consumption and the emission of pollutants from coal combustion, and increase the production efficiency of the tobacco seedling and the tobacco baking at the same time.

Description

A tobacco seedlings and tobacco curing joint heating system

FIELD

[0001] The present invention pertains to the tobacco and tobacco seedling baking facilities technology, and more particularly, to a combined flue-cured tobacco and tobacco seedling heating system.

Background technique

[0002] In the process of tobacco production, tobacco seedlings and tobacco curing are two very important aspects. Tobacco seedlings cultivated in suitable period, age, disease-free, robust, Tobacco suitable shape and size for the purpose, which plays a key role in the overall tobacco producing process is completed successfully. Tobacco breeding techniques so as to cover divided into: greenhouse nursery, Small Shed nursery and nursery land three categories, and in accordance with the vegetative nursery is divided into: nursery seedling tray, seedling raising, nutrition Ponds and nutrition bag nursery four categories. Modern intensive agriculture in order to save for the purpose of industrial production and so on tobacco breeding, the modern greenhouse nursery has become a mainstream trend, with respect to Small Shed nursery and nursery land, it has many advantages, the most the main points is this: intensive and regulatory available. Currently, the use of multi-nutrient solution nursery greenhouses Seedling floating disc, a plurality of alignment · i.e. in nursery greenhouses breeding pools, tanks nutrient solution into a certain height, a plurality of seedling floating disc floating on top of each seedling nursery solution, this patent also focused on the breeding method. Tobacco curing process and the process will determine the quality of tobacco, currently the most widely used technology for the flue-cured tobacco flue-cured tobacco barn-intensive technology, it is the foundation "of modern tobacco agriculture". Promote the use of bulk curing barn, raise the level of flue-cured tobacco, to improve the average kinds of tobacco area, and gradually form of intensive farming and specialized curing, played a significant role in promoting. But with the development of tobacco farming, existing bulk curing barn are obviously not satisfactory in many respects, the main drawbacks include: 1, each seat is equipped with a stove barn, with a fireman needs, thus increasing labor costs and construction costs; 2, barn temperature control of a single method, and thus the temperature control accuracy is not high; 3, coal can not be centrally controlled pollutants, the environmental pollution caused by large. For some of the disadvantages mentioned above, central heating intensive barn has become a development hot spot today, it is a good solution to some problems existing bulk curing barn, the barn is a new direction for intensive development.

[0003] Since the tobacco nursery greenhouses arranged outdoors, so the nursery temperature is determined by the ambient temperature, but in some areas, outside temperature during the spring seedlings are relatively low, usually at below 10 ° C, which would have the growth cycle of tobacco seedlings have a huge impact. Tobacco seed germination requires suitable temperature, generally 25 ° C~28 ° C is appropriate, a minimum 11 ° C~12 ° C, up to 30 ° C. Under conditions of 28 ° C~30 ° C, germinate fast, but irregular; More than 30 ° C germination rate, exceed 35 ° C seeds lose viability; if less than 12 ° C, then slowly germinating, will occur too low frost damage. In view of the above factors, in order to improve the survival rate of tobacco seedlings, shorten the seedling growth cycle and improve the quality of seedling growth, the need to install the heating apparatus in nursery greenhouses. Currently, greenhouse heating technology abroad applications include: heating stove, electric heating tube heating, heat pump heating and hot water piping system, a new heating. I, stove heating, i.e., using coal or gas stove through the air in the heat exchanger is heated in the heat exchanger cover greenhouses; 2, the electrical heating tube heating, i.e., using heated air in the greenhouse heat emitted during energizing the electric heating tube ; 3, heat pump heating, greenhouse heating air in the heat generated by the heat pump working ie; 4, hot-water heating piping system, i.e., by arranging a plurality of water pipes in the greenhouse, the greenhouse is heated by the hot water flowing inside the pipe air pressure which the heat source is generally hot water boiler. They are characterized by the greenhouse air are directly heated, such a conventional manner for greenhouse heating effect very good, but the heating effect is not apparent to the floating disc nursery greenhouses nutrient solution, because heat is hard to pass through the heated air floating disc reaches the nutrient solution, making it difficult for the heating Tobacco root. In tobacco curing tobacco seedlings joint heating system, covering a new greenhouse heating method, we can solve this problem.

[0004] with respect to the central heating barn-intensive traditional intensive barn with many changes: 1, since the central heating system for the entire population of heating the barn, so unlike conventional single seat mounted in the same package Curing Barn hot air chamber connected to the smoke chamber, but placed outside the barn alone; 2, steam, hot flue gas or the like is supplied to the heating device generates each of a barn, the device needs to exit from heating to design each barn uniform heating network installation; 3, and the furnace blower is no longer set in each block bulk curing barn interior; 4, a barn to make each position independently of the baking process (because of the quality of tobacco in each barn, the number of , water content, and maturity were different), to ensure the quality of baking, each barn still retains a circulating fan, into the throttle, humidity and window control instrument. The choice of heating equipment, including: hot water boiler, steam boiler, oil boiler and hot stove, they have advantages and disadvantages: 1, low temperature hot water boiler operation, security is good, the price is cheap, but the heat transfer medium temperature (85-95 ° C) lower, the heat load to achieve the same premise, it is necessary to increase the heat transfer area, significantly increase the cost of the heat exchanger, the heat load is very difficult to assign each barn uniformly hot water boiler must be used circulating pumps, the power consumption increases; 2, high heating efficiency of the steam boiler, steam parameters stable, barn heat load distribution can be achieved more evenly, boiler steam requirements for fireman high, high operation and maintenance requirements; 3, oil boiler after a period of operation required to replace conducting oil, high operating costs; 4, hot air from contamination after the air heat no fouling of the pipe and the radiator, but the low heat transfer coefficient, the heating load changes poor adjustability.

SUMMARY

[0005] for the disadvantages of the prior art, an object of the present invention to provide a tobacco seedling with tobacco leaves combined heating system, which can effectively reduce the equipment capital and operating with the tobacco curing tobacco seedling production process of these two costs and improve the quality of seedling growth and quality of tobacco leaves, reducing coal consumption and coal-fired emissions of pollutants while improving production efficiency and tobacco seedlings of these two processes.

[0006] To achieve the above object, the present invention provides a tobacco leaves and tobacco seedlings combined heating systems, comprising a boiler portion, and a portion of central heating nursery greenhouses barn portion boiler portion comprises a boiler, preheating , a distribution cabinet, the coal, sub-cylinder, water softener, soft water tank, a water pump, nursery greenhouses portion comprising air water heat exchanger, circulation pump, trap, the water manifold, the charge of the water, the water mains, circulating water tank , central heating barn main conduit portion comprising steam, the steam nozzle, electric valve, steam heat exchanger, a manual valve, a catch basin, trap, drain valve, backwater main duct, the feed coal for coal-fired into the boiler, for burning coal-fired boiler body to heat the boiler feed water, steam generation, power distribution cabinet to the unit for each power boiler body, sub-cylinder steam boiler for generating water to the air distribution heat exchangers and steam main pipe, and the remaining steam to provide heating for life, circulating water tank for supplying water required for breeding cycle heating, air-water heat exchanger for circulating water tank For circulating water is heated, and the heated water into the circulating pump, the circulating pump for providing power for the circulating water heated, and the heated water into the trap, trap settings how an outlet for the heated water assigned to each nursery greenhouses, trap out into the water header outlet and the pipe section is connected to the heated water delivered to the water manifold, the water manifold from breeding shed into the middle sidewall, and traverse the respective breeding pool, for the heated water into the water allocated to the pieces of charge, the charge of the water outlet is connected to the water mains for heating the water supplied to the water mains, and the water mains cycle water tanks connected to the heated water returned to the circulating water tank, the water manifold and the outlet manifold are disposed in parallel and located on the same vertical plane, and the entire nursery pool divided into two parts symmetrical, further gas-water heat exchanger for sub-cylinder steam heat distribution, and water generated after heat supplied to the soft water tank, demineralized water softener for providing soft water tank, soft water tank for water delivery Feed pump, a pump for delivering water to the preheater, preheater for preheating the water, and the water delivered to the preheated boiler, a steam main pipe for vapor delivery points of delivery to the cylinder electric valve and the steam nozzle, the steam nozzle for injecting steam into the barn hanging smoke chamber, electric valve for adjusting the temperature of the heating chamber barn air by controlling the amount of steam into the steam heat exchanger, a steam heat exchanger is used by barn air steam heating chamber is heated, and the water vapor formed after the heat sequentially passes through the manual valve, a catch basin, trap and return to the main conduit conveying the soft water tank, the drain valve for heating systems in the United after remaining in the system to stop working the water is discharged.

[0007] The boiler section further includes a filter, exhaust fan, chimney, slag, preheater is further configured to transmit the subsequent combustion of the coal boiler flue gas to the dust, the flue gas dust collector for removing dust , and transfers the dust to the flue gas exhaust fan, exhaust fan for discharging the flue gas through the tobacco ®, Cleaner for the boiler combustion ash removal.

[0008] In the breeding season, the steam delivered to the sub-cylinder air-water heat exchanger, in order to start the breeding process tobacco, tobacco baking season, the steam delivered to the sub-cylinder steam main pipe, to initiate the tobacco curing process.

Number [0009] of two circulating pump, wherein a working station, another standby.

[0010] the nursery greenhouses only one row nursery ponds, nursery pool traverses nursery greenhouses width direction of each of, for breeding pools right side into the water mains and water mains, one end of the water charge and into the water manifold is connected into the water charge of the other end and · outlet manifold is connected to the vertical portion connected with the charge of water into the water manifold to the bottom of the pool and close to the breeding nursery pool sidewall extending downwardly and folded breeding pool center, connected to the water mains into the water charge and also a portion perpendicular to the bottom of the pool and close to the breeding nursery pool sidewall extending downwardly and folded breeding pool center in charge of the rest of the water at the bottom of the breeding pond, and roundabout way to the right throughout the breeding pool two lateral side portion, into the water charge tank at the bottom of breeding and the breeding pools respectively located 1/4 3/4 of the width, to ensure uniform distribution of fluid temperature breeding ponds seedling, nursery to the right side into the water manifold and the outlet manifold For the pool, the same as the charge of the water into the water manifold arrangement with the left and water mains.

[0011] The present invention is contemplated by the above technical solution, compared with the prior art, the present invention has the following advantages:

[0012] (I) is reduced coal consumption:

[0013] central heating of the present invention uses the same heating equipment for a number of bulk curing barn barn a simultaneous heating, industrial boilers burning stable and always operate at high temperatures, combustion conditions better than small coal-fired furnace , central heating boiler before the smoke evacuation flue gas economizer provided in the waste heat recovery, reducing the flue gas heat loss. Industrial boiler thermal efficiency is about 75% higher than the average efficiency of small coal-fired furnace at full load, barn central heating coal consumption can be reduced by 20%.

[0014] High (2) the degree of automation:

[0015] Under the present invention the central heating dozens barn heating by the same heating equipment, requires only two dozens barn to fireman. Complete real-time without human care, improve the automation of tobacco curing process, reduce labor costs.

[0016] (3) Temperature and humidity controlled with high precision:

[0017] The bulk curing barn central heating system in accordance with the automatic control of temperature and humidity measured data, automatically adjusting control solenoid ball valve to control the flow of steam temperature barn. Control accuracy than conventional stoker Barns with artificial light a fire and control the temperature more by smell.

[0018] (4) high quality flue-cured tobacco:

[0019] As a result of the new heating method and precise temperature and humidity control system, we can ensure that the entire tobacco curing process in accordance with a predetermined program, significantly enhance the quality of tobacco curing. [0020] (5) high heating efficiency and greenhouse:

[0021] the tobacco seedlings in the greenhouse laying a new hot water pipeline system, the nutrient solution and air simultaneously heated greenhouse breeding pool, can ensure the Tobacco root reaches the desired temperature, so that good heating effect, heating efficiency high.

[0022] (6) Environmental protection:

[0023] The present invention is industrial steam central heating boiler efficient wet scrubber, the dust removal efficiency of 95% or more, up to 70% desulfurization efficiency.

[0024] (7) long life, low cost equipment:

[0025] central heating equipment for heating greenhouses to the nursery in the spring, the summer heat to the flue-cured tobacco barn, combined with the same equipment at the season, to improve the economy of equipment; central heating flue-cured body of the device is composed of a heat exchanger, heating boiler, barn temperature and humidity control system; if steel-aluminum finned heat exchanger, the life of up to 20 years, but the boiler may also be used more than 20 years; compared to conventional bulk curing barns, steam Note that the central heating boiler is running to be a regular part make equipment maintenance and repair work, the boiler during the outage, but also on boilers, auxiliary equipment, heat exchangers and pipe network maintenance and repair to ensure its life.

BRIEF DESCRIPTION

[0026] Figure I is a tobacco seedlings present invention is combined with the heating system of the tobacco leaves the overall system of FIG.

[0027] FIG. 2 is a system of the present invention, the heating manifold entrance nursery greenhouses D representation.

[0028] FIG. 3 is a schematic view of a three-dimensional manifold at the end of nursery greenhouses heating system of the present invention.

[0029] FIG. 4 is a schematic diagram of the heating system barn system of the invention.

Detailed ways

[0030] To make the objectives, technical solutions and advantages of the present invention will become more apparent hereinafter in conjunction with the accompanying drawings and embodiments of the present invention will be further described in detail. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention.

[0031] As shown in FIG. I, the present invention tobacco seedling combined with tobacco leaves room heating system comprising a boiler portion, and a portion of central heating nursery greenhouses barn portion.

[0032] The boiler comprises a boiler section I, distribution cabinets 2, 3 Cleaner, the stoker 4, preheater 5, filter 6, 7 exhaust fan, smoke ® 8, sub cylinder 9, softener 30, soft water tank 31 to pump 32.

[0033] nursery greenhouses section comprises air water heat exchanger 10, circulating pump 11, water separator 12, the water manifold 13, charge 14 into the water, the water mains 15, circulating water tank 18.

[0034] barn central heating portion comprises a steam main pipe 19, the steam nozzle 22, electric valve 23, a steam heat exchanger 24, the manual valve 25, a catch basin 26, trap 27, the drain valve 28, the main channel return 29.

[0035] 4 for the stoker fired into the boiler body I.

[0036] I for burning coal-fired boiler, boiler feed water is heated to produce steam.

[0037] The preheater 5 for conveying coal combustion boiler body I after the flue gas to the dust collector 6.

[0038] 6 precipitator for removing dust in flue gas, the flue gas and transferred to the dust exhaust fan 7.

[0039] The exhaust fan 7 for discharging the flue gas through a chimney 8.

[0040] 3 Cleaner for removing ash after combustion boiler I.

[0041] The electric power distribution cabinet 2 the respective means for supplying power to the boiler body I. [0042] 9 minutes cylinder steam boiler for distribution to the body I generated steam-water heat exchanger 10 and the steam main pipe 19, this evening Bu, sub cylinder 9 is also used to provide steam for the remaining life of heating. Specifically, in the breeding season, the steam distribution sub-cylinder 9 to the gas-water heat exchanger 10, to start the process of tobacco seedlings; tobacco baking season, the steam partial cylinder 9 into the steam delivery main duct 19, to start the drying tobacco bake process.

[0043] circulating the circulating water tank 18 for providing the required heating nursery.

[0044] The gas-water heat exchanger 10 for heating circulating water circulating tank 18 and supplies the heated water into the circulating pump 11.

[0045] The circulating pump 11 for providing power for the circulating water heated, and the heated water into the trap 12. In the present embodiment, there are two circulating pumps, wherein a work station, another standby.

[0046] The trap 12 is provided with a plurality of outlets for dispensing the heated water to the respective breeding shed 16. Specifically, the water trap 12 is assigned to a corresponding number of heating the greenhouse 16 via a plurality of seedling outlet. * [0047] As shown in FIGS. 2 and 3, the trap into the water outlet manifold 12 is connected to pipe portion 13, for heating the water supplied to the manifold 13 into the water.

[0048] manifold 13 enters into the water from the middle of the sidewall 16 of the greenhouse seedling, nursery and traverses each cell 17, for dispensing the heated water into the water charge to 14 pieces.

[0049] The charge 14 into the water outlet 15 is connected to the water mains for heating the water supplied to the water manifold 15.

[0050] The water manifold 15 is connected to the circulation tank 18 for the heated water tank 18 is returned to circulation.

[0051] Further, the water manifold 13 and outlet manifold 15 are disposed in parallel and located on the same vertical plane, and the entire nursery pool 17 is divided into two symmetrical portions.

[0052] The embodiment according to the present embodiment of the present invention is applied to the nursery cell 17 arranged in a single row nursery greenhouses 16, i.e., only one row of seedling nursery pool of 17 16 greenhouse, nursery each cell 17 traverse width direction 16 nursery greenhouses. In this embodiment, for the breeding pond water manifold 13 into the manifold 15 and the outlet 17 of the right, the one end of the charge 14 into the water and into the water header 13 is connected, is connected to the other end of charge into the water header 14 and the outlet 15. The vertical portion 14 connected to the water header 13 into the water charge tank 17 to the bottom of the breeding nursery pond and against the side wall 17 extends downwardly, and the central bent nursery pool 17, 14 is connected to charge into the water manifold 15 and outlet portion also perpendicular to the bottom 17 of the pool and close to the breeding nursery pool side wall 17 extending downward, and the bent center nursery tanks 17, the remainder of the charge 14 into the water tank 17 at the bottom of the seedling, and in a roundabout way through in the nursery of the entire pool of the right 17. Two side portions 14 located at the bottom into the water charge tank 17 are respectively positioned nursery and the nursery cell 17 1/4 3/4 width, this arrangement helps ensure uniform distribution of the breeding nursery pool 17 of liquid temperature.

[0053] For breeding pond water manifold 13 into the manifold 15 and the outlet 17 of the right side, the charge of water into the arrangement 14 is identical with the water manifold and outlet manifold of the left, which is not repeated herein.

[0054] The gas-water heat exchanger 10 for further distribution points 9 of the cylinder steam heat, and water generated after heat supplied to the soft water tank 31.

[0055] 30 for providing a water softener tank 31 of demineralized water is soft.

[0056] soft water tank 31 for delivering water to the feed pump 32.

[0057] The water feed pump 32 for delivery to the preheater 5.

[0058] 5 further preheater for preheating the water, the water supplied to the boiler body and preheated I.

As shown in [0059] FIG. 4, the main duct 19 for steam partial vapor delivery cylinder 9 to the steam delivery nozzle 22 and the electric valve 23.

[0060] The steam nozzle 22 for injecting steam into the smoke chamber 21 linked to the barn. [0061] The electric valve 23 for adjusting the temperature within the heating chamber 20 through the air barn controlling the amount of steam into the steam heat exchanger 24.

[0062] The steam heat exchanger 24 for heating the air in the chamber 20 is heated by steam barn, and is formed after the water passes through the steam heat the manual valve 25, a catch basin 26, trap 27 and return 29 delivery main pipeline to the soft water tank 31.

[0063] The drain valve 28 is used in a combined heating system to stop the water remaining in the system after the work is discharged.

[0064] The working principle of the present invention is as follows:

[0065] When the operation of the system, the combustion of the coal stoker boiler 4 into the I, combustion ash discharged from the boiler 1 Cleaner 3, flue gases produced by burning coal successively through a preheater 5, filter 6, exhaust fan 7, and 8 finally discharged via a stack system. The water in the boiler 31 I provided by the soft water tank, the water in the tank 31 to go through before entering the softened softened softened water 30, to soften the water tank to the pump via the preheater 32 and the rear body 5 into the boiler of I , to power the pump 32 to the water flow, while the preheater 5 is the use of flue gas heat to preheat water. Receiving preheated water in the coal-fired boiler heat release I, and gasified to become a vapor, then the vapor fraction into the cylinder 9 waiting to be assigned to the respective steam equipment. The above process is the same in tobacco seedlings and tobacco curing process, the following describes the two different processes at.

[0066] In the breeding season, the steam is sent to the air cylinder 9 points water heat exchanger 10, where heat and to heat the water circulating in the circulating water tank 18 sent. After the exotherm is complete the steam is condensed into water, and returned to the soft water tank 31, on the other side, the circulating water heated by the water pump 11 into the circulation, into the trap 12 via the circulating pump 11 after pressing. At trap 12, 16 corresponding to the number of nursery greenhouses provided with a corresponding number of manifold 13 into the water, circulating water into the water is dispensed to the respective manifold 13 at the trap 12. After water manifold 13 enters into the breeding shed 16, 17 corresponding to the respective breeding pools extending a charge into the water 14, and the hot water delivered to the charge of the pieces 14 into water. Charge 14 into the water tank 17 is arranged at the bottom of breeding, the water in the hot charge 14 flows continuously heat to the nutrient solution tank 17 is heated nursery. After the exotherm is completed, the charge of the water in the water 14 is fed into the water mains 15, and 15 returned to the water mains via a circulating water tank. In the breeding process, there are two circulation circuit: part of the aqueous medium circulation circuit boiler room and the aqueous medium circulation circuit portion nursery greenhouses, they are gas-water heat exchanger 10 is a binding point while running.

[0067] In the tobacco curing season, the steam is sent to steam cylinder 9 points main pipe 19, the steam main pipe 19 delivering steam into the barn group, and corresponding to a respective branch extending barn. The branch will be a small portion of the steam required, steam is injected into nozzle 22 via a hanging barn smoke chamber 21, to promote tobacco resurgence, and the majority of the steam is controlled through the electric valve 23, the steam enters the heat exchanger 24. Air in the steam passes through the steam heat radiating fins 20 barn heating chamber 24 is heated, the heated air chamber for baking barn hanging tobacco leaf, and the steam is condensed into water, heat, and leaving the steam transducer heat 24. Then, condensed water sequentially passes through the manual valve 25, a catch basin 26, trap 27, and then return into the main duct 29, via the return conveyance main duct 29, and ultimately back to the tank 31. Drain valve 28 is not turned on when the system works only for the water remaining in the exhaust system after the system stops working. In the tobacco curing process, only a water medium circuit.

[0068] Those skilled in the art will readily appreciate, the above-described preferred embodiment of the present invention only but are not intended to limit the present invention, any modifications within the spirit and principle of the present invention, equivalent substitutions, and improvements, etc., should be included within the scope of the present invention.

Claims (5)

A tobacco curing tobacco seedlings with the joint heating system, including boiler room section, part nursery greenhouses and central heating barn section, boiler room section includes a boiler, heater, power distribution equipment, coal machine, sub-cylinder, water softener, soft water tank, a water pump, nursery greenhouses portion comprising air water heat exchanger, circulation pump, trap, the water manifold, the charge of the water, the water mains, circulating water tank, a steam central heating portion comprises a main barn pipe, the steam nozzle, electric valve, steam heat exchanger, a manual valve, a catch basin, trap, drain valve, return main path, characterized in that, for the coal into coal-fired boiler body; boiler body for coal combustion, to heat the boiler feed water to produce steam; distribution cabinet means for supplying power to each power boiler body; partial cylinder steam boiler for generating water distribution to the air heat exchanger and steam main pipe, and the remaining steam to provide heating for life; circulating water tank for supplying water required for circulating heating seedling; gas-water heat exchanger for circulating the circulating water supplied into the tank Heated, and the heated water into the circulating pump; circulating pump for providing power for the circulating water heated, and the heated water into the trap; trap is provided with a plurality of water outlet, which the heated water is used to assign each nursery greenhouses; trap outlet portion of the pipe into the water manifold is connected to the heated water into the water supplied to the manifold; from entering into the water manifold of the central spacer nursery greenhouses, and traverses each breeding pool, for the heated water into the water allocated to the pieces of charge; charge into the water outlet is connected to the water mains for heating the water supplied to the water mains; circulating tank is connected to the water mains, for the heated water is returned to the circulating water tank; the water manifold and outlet manifold are disposed in parallel and located on the same vertical plane, and the entire nursery pool divided into two parts symmetrical; further gas-water heat exchanger for sub-cylinder steam heat distribution, and water generated after heat supplied to the soft water tank; demineralized water softener for providing soft water tank; soft water tank for delivering water to the feed pump A pump for delivering water to the preheater; water preheater for preheating water to the boiler body and preheated; main conduit for delivering the steam partial steam to the steam distribution cylinder head and electric valve; steam nozzle means for injecting steam into the barn linked to the smoke chamber; electric valve for adjusting the temperature of the heating chamber barn air by controlling the amount of steam into the steam heat exchanger; steam through a heat exchanger for steam roasted after the drain valve for combined heating system stops working; room air in the room heating water is heated, and the vapor formed after the exothermic sequentially conveyed through the manual valve, a catch basin, trap and return to the main conduit soft water tank the water remaining in the system is discharged.

2. The system according to claim I, characterized in that the filter further comprises a boiler portion, exhaust fan, chimney, Cleaner; further preheater for combustion of coal boiler flue gas is transferred to the subsequent dust; precipitator for removing dust in flue gas, flue gas and transferred to the dust exhaust fan; exhaust fan for the flue gas is discharged through ® smoke; Cleaner for removing post-combustion boiler body coal ash.

3. The system according to claim I, characterized in that, in the breeding season, the steam delivered to the sub-cylinder air-water heat exchanger, to start the process of tobacco seedlings; tobacco baking season, the steam distributed to the sub-cylinder steam main pipeline to start the tobacco curing process.

The system according to claim I in claim 1, characterized in that the number of cycles of the two pumps, wherein one work station to another backup.

5. The system according to claim I, characterized in that only one row of the seedling nursery greenhouses pools, each pool breeding nursery greenhouses traverse width direction; pool for breeding and the right side of the water mains into the water manifold, into the water charge and one end of the water manifold is connected, is connected into the water charge of the other end and the water mains; portion connected vertically into the water charge and into the water header at the bottom of breeding pool and close to the breeding pool side wall extending downwardly to the center of bending in the nursery pond off; portion connected to the water mains into the water charge and also breeding pool and close to the bottom of side walls extending perpendicularly downwardly nursery ponds, pools and bent breeding center, the remainder of the charge into the water at the bottom of the breeding pond, and in a roundabout manner throughout the breeding pool right; both side portions into the water charge tank at the bottom of breeding and the breeding pools respectively located 1/4 width 3/4 to ensure uniform distribution of fluid temperature seedling breeding ponds ; pool for breeding and the right side of the water mains into the water header, the same as the charge of the water into the water manifold arrangement with the left and water mains.