A Sulfur Mud and Sulfur Paste Conversion Device and Conversion Technology Field of the Invention [0001] The present invention belongs to the technological field of desulphurization byproduct processing and specifically relates to a sulfur mud and sulfur paste conversion device and method. Background to the Invention [0002] Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field. [0003] Sulfur exists in three forms in coal, namely, organic sulfur, pyritic sulfur (exiting in the forms of pyrite and marcasite sulfur) and sulphate sulfur. Although sulfur can burn and release heat, it is a very harmful component. The generated sulfur dioxide(S0 2 ) and a small amount of sulfur trioxide(S0 3 ) after sulfur burning can pollute the environment if injected into the atmosphere; they are the main substances forming acid rain and harmful for human body, animal, plant and ground building. In order to reduce the above harms, large coal consumers such as coking plant and chemical fertilizer plant would conduct desulfuration before using coal. [0004] At present, many coking plants in China adopt the desulfurization technology with ammonia as the alkali source; this technology belongs to wet desulphurization; the solution that has absorbed hydrogen sulfide in the desulfuration workshop section would generate sulfur foam in the reactivation process, and this sulfur foam is a foam like solid-liquid mixture. Many coke making enterprises adopt the centrifuge dripping method to conduct dehydration and finally obtain the sulfur mud or sulfur paste with a certain water content. The solid in sulfur mud or sulfur 1 paste is mainly sulfur granule and also contains a small amount of oily colored organic impurities. Sulfur is a kind of important chemical raw materials, but since the purity of sulfur contained in the sulfur mud or sulfur paste is not high, it is difficult to purify and process. So, the value of sulfur mud and sulfur paste is low, they are mainly used for the treatment of solid wastes. The general treatment method is piling up and landfill or take out. If these sulfur mud and sulfur paste are piled up outside, it will cause environmental pollution and also a waste of resources; For take-out, its economic benefit is low, and the buyers refine waste sulfur by heating them, it consumes a high quantity of coal so as to cause the waste of resources. [0005] In the current technologies, there are also processes for recovery processing and using sulfur mud and sulfur paste: (1) Distillation process taking steam or flue gas as the heat source This process ignores the colored organic impurities in the solid, therefore the obtained sulfur has a low purity and low utility value; (2) Extraction technology In case of adopting extraction technology to recover and refine sulfur in the sulfur mud and sulfur paste, this process is complex, it has a high cost of production and the production rate of the obtained sulfur is low; (3) Sulfur melting process with sulfur melting kettle In this process, it adds sulfur mud and sulfur paste into sulfur melting kettle, so as to melt the total sulfur in the sulfur mud and sulfur paste into liquid. The energy consumption of this process is too large in the process of sulfur melting, greatly increasing the cost of production. [0006] The harmless treatment for the sulfur mud and sulfur paste is an important part of desulfurization recycling section. From the above description, it can be seen that for the byproducts produced after desulfuration from the burning coal, such as sulfur mud, sulfur paste, etc., the sulfur contained in them has a low purity, poor quality and is hard to sell, in addition to decocting a low-purity sulfur, there is no other better way to make use of it now. 2 Summary of the Invention [0007] It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative. [0008] To this end, the present invention provides a sulfur mud and sulfur paste conversion device including a housing, a base support welded under the housing and furnace gas exit on the top surface of housing; the upper part of housing feed end has the feed inlet on which a feeder is mounted; the bottom of housing slag-out end has the slag outlet on which a water seal device is mounted; the bottom of housing is oblique plane on which fixed fire grate segments are progressively arranged and fixed; a wind chamber is set under the fixed fire grate segments, and the inlet valve is mounted for the wind chamber; moving fire grate segments are set between the two adjacent fixed fire grate segments mentioned above; this moving fire grate segment is fixed on the adjustable shelf; the adjustable shelf is located right under the bottom of housing; several support frames are set under the bottom of the adjustable shelf, and the bottom of support frame is connected with the sliding rail fixed on the base support; the support frame connects with the transmission device; waste heat recovery device is set inside the housing. [0009] Preferably the transmission device includes a connecting rod and driving device, and the support frames are connected through connecting rod and driving device. [0010] Preferably the driving device is a motor, hydraulic cylinder, air cylinder or oil cylinder. [0011] Preferably the housing is equipped with heat insulation material. [0012] A second aspect of the present invention provides a sulfur mud and sulfur paste conversion method including technology includes the following steps: 3 (1) Firstly, sulfur mud and sulfur paste are dried to the water content of less than 8%; (2) The dried sulfur mud and sulfur paste are transported to the feed inlet of conversion device by the feeder, then sulfur mud and sulfur paste are distributed on fixed fire grate segment and moving fire grate segment; (3) Bits of wood are ignited by naked flame to make the temperature inside the housing increase to that can ignite the sulfur mud and sulfur paste. The wind chamber controls the air inflow to make sulfur mud and sulfur paste sufficiently burn and make sulfur mud and sulfur paste convert into sulfur dioxide gas and slag. The generated sulfur dioxide gas enters into the sulfur dioxide recovery device connected with housing through the furnace gas exit on the top surface of housing, to recycle the sulfur dioxide. The slag gradually moves towards the slag outlet of housing along the bottom of slag; the slag enters into the water seal device located at the slag outlet through the slag outlet; the slag is recycled after water seal. The waste heat generated from sulfur mud and sulfur paste burning is recycled through waste heat recovery device. [0013] The conversion device according to the present invention is used for the treatment of sulfur mud and sulfur paste. In this device, the back face of the housing is designed as slant face, it is advantageous to the slag discharge. The fixed fire grate segment and moving fire grate segment are arranged, the fixed fire grate segments inside the housing are directly arranged and fixed on the back face of the housing step by step, combining with the back face of the housing as a whole, it can not only make full use of the slant face of the back face of the housing, but also can have a simple construction that it needn't to use complex fixed parts so as to save cost; the moving fire grate segments are arranged between two adjacent fixed fire grate segments at intervals, the moving fire grate segment entering inside the housing through the back face of the housing can conduct the reciprocating running between the fixed fire grate segments, it can not only help the sulfur mud and sulfur paste to obtain sufficient burning repeatedly inside the housing, but also can push the 4 slag after fully burning down onto the fixed fire grate segment, so as to discharge it to the slag outlet along the slant back face of the housing, further enter to the water seal device for sediment and dust fall. Meanwhile, a waste heat recovery unit is set inside the housing, it can recycle the heat produced from sulfur mud and sulfur paste burning, so as to achieve energy saving and green environmental protection. [0014] From the aforementioned description, it can be seen that this conversion device has a reasonable structural design, simple construction, strong practicability, user-friendly control and high operational reliability. The treatment for the sulfur mud and sulfur paste is of high efficiency and friendly to environment. [0015] The sulfur mud and sulfur paste conversion process mentioned in the present invention is that it firstly ignites the sulfur mud and sulfur paste in the sulfur mud and sulfur paste conversion device, after burning, it turns into sulfur dioxide and slag, then it puts the sulfur dioxide into the recovery device for recycling. It can be used for producing vulcanizate such as ammonium sulfite, etc. The slag recycling can be used for preparing cement. The waste heat produced from burning can also be recycled by waste heat recovery device. [0016] The sulfur mud, sulfur paste conversion process of the present invention has the advantages of new technology and reliable system operation, compared to the existing technology, it can utilize the sulfur mud, sulfur paste to the maximum extent. Meanwhile, it has low production cost, low energy consumption, and generates ammonium sulfite and other vulcanized products from the recycling of sulfur dioxide gas which has high economic value, and therefore the conversion process of the present invention is of great significance for the environmental protection, and has good economic benefits. 5 Brief Description of the Drawings [0017] One or more preferred embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawing in which: Fig. 1 is a schematic structural view of sulfur mud, sulfur paste conversion device according to the present invention; wherein the following reference numerals have been employed: 1 for the housing, 2 for the base support, 3 for the furnace gas outlet, 4 for the feed end of the housing, 5 for the feeder, 6 for the slag tapping end of the housing, 7 for the slag outlet, 8 for the water seal arrangement, 9 for the bottom surface of the housing, 10 for the fixed fire grate segment, 11 for the air chamber, 12 for the adjustable shelf, 13 for the moving fire grate segment, 14 for the support frame, 15 for the pulley, 16 for the slide rail, 17 for the waste heat recovery device, 18 for the connecting rod and 19 for the driving device. Detailed Description [0018] As can be seen from Fig.1, a kind of sulfur mud and sulfur paste conversion device includes the housing 1, the base support 2 welded to the lower part of the housing, the furnace gas outlet 3 at the top surface of the housing; the feed inlet is located at the upper part of feed end 4 of the housing, the feeder 5 is installed at the feed inlet, and the sulfur mud and sulfur paste to be treated will be delivered into the housing I by the feeder 5. [0019] The slag outlet 7 is located at the slag-out end 6 of the housing, and the water seal arrangement 8 is installed at the slag outlet 7, which can not only help prevent the air in slag outlet 7 from entering the device but play a role in the dust settling of slag to keep the atmosphere from the pollution of the slag dust, and being in favor of environmental protection. Bottom surface 9 of the housing is an inclined plane, and the fixed fire grate segment 10 is arranged and fixed stepwise on the bottom surface 9 of the housing. The wind chamber 11 is located at the lower part of 6 the fixed fire grate segment 10, and inlet valve is installed to the wind chamber 11.The air flow going into to the housing 1 under the control of the inlet valve of the wind chamber 11 is used to control the sulfur dioxide content of furnace gas outlet 3.The moving fire grate segment 13, located between two adjacent fixed fire grate segments 10 of the fixed fire grate segments, is fixed on the adjustable shelf 12, and the adjustable shelf 12 is located just underneath the bottom surface 9 of the housing. Several support frames 14 are installed at the bottom of the adjustable shelf 12, and the bottom of the support frame 14 is connected to the slide rail 16 fixed in the base support 2 through the pulley 15. [0020] The transmission device includes connecting rod 18 and driving device 19, and the bearing frames 14 are connected to the driving device 19 through the connecting rod 18. [0021] The driving device 19 is electrical machine or hydraulic cylinder or air cylinder or oil cylinder. [0022] The housing 1 has thermal insulation material. [0023] A sulfur mud and sulfur paste conversion technology includes the following steps: (1) Firstly, sulfur mud and sulfur paste are dried to the water content of less than 8%; (2) The dried sulfur mud and sulfur paste are transported to the feed inlet of conversion device by the feeder 5, then sulfur mud and sulfur paste are distributed on fixed fire grate segment 10 and/or moving fire grate segment 13; (3) The wood flour is ignited with naked fire, and heat up gradually the housing 1 to light the sulfur mud and sulfur paste; the air inflow is controlled by the wind chamber 11 so that the sulfur mud and sulfur paste can be burned to the full and converted into sulfur dioxide and slag; the generated sulfur dioxide gas goes into the sulfur dioxide recovery unit connected with the housing 1 through the furnace gas outlet 3 at the top surface of the housing for the recycling of the sulfur dioxide, the ammonium sulfite and other vulcanized products can be generated from the recycling of sulfur dioxide gas. The slag moves towards the slag outlet 7 of the housing 1 along the bottom surface 9 of the housing, the slag goes into the water seal arrangement 8 located at the slag outlet 7 through slag outlet 7, and the recycling of slag is performed after the completion of water seal; the waste heat from the burning of sulfur mud and sulfur paste is used for recycling through waste heat recovery device 17. [0024] The sulfur mud and sulfur paste to be treated is delivered to the housing 1 by the feeder 5, when merged with the air sent by the wind chamber 11, the sulfur mud and sulfur paste are ignited and start burning in the housing 1, and the sulfur dioxide gas from the burning is discharged through the furnace gas outlet 3, and goes into the sulfur dioxide recycling unit connected to the housing 1 for the recycling treatment of sulfur dioxide, which can generate the ammonium sulfite and other vulcanized products. The fixed fire grate segment 10 and moving fire grate segment 13 are arranged alternatively along the bottom surface of the housing 9 in the direction from the feed end of the housing 4 to the slag tapping end of the housing 6.The thrust or tensile force from the driving device 19 electrical machine, hydraulic cylinder, air cylinder or oil cylinder is applied to the support frame 14 through the connecting rod 18, and the pulley 15 connected to the bottom of support frame 14 will slide along the slide rail 16 by the thrust or tensile force and the adjustable shelf 12 connected with the support frame 14 moves with it, which helps the moving fire grate segment 13 which is arranged and fixed stepwise on the flexible mount 12 move to and fro between the fixed fire grate segment 0, and the reciprocating motion of moving fire grate segment 13 is not only conducive to the full burning of sulfur mud and sulfur paste within the housing 1 of the device, but also driving the slag from the full burning to the slag outlet 7 step by step and going into the water seal arrangement 8 at the slag outlet 7. 8 [0025] Although the invention has been described with reference to specific examples it will be appreciated by those skilled in the art that the invention may be embodied in many other forms. 9