Organic fertilizer production system and production method

Abstract

The invention provides an organic fertilizer production system and a production method. The production system comprises a fermentation system; the deodorization system comprises a first reversing valve connected with the fermentation system; a combustion chamber; the first multifunctional heat accumulator and the second multifunctional heat accumulator are respectively communicated with the first reversing valve and the combustion chamber; the fermentation system generates organic fertilizer and odor through fermentation, and the odor alternately enters the first multifunctional heat accumulator or the second multifunctional heat accumulator to be decarbonized, dehumidified and preheated under the adjustment of the first reversing valve and then enters the combustion chamber to be combusted; smoke generated by combustion flows into the second multifunctional heat accumulator or the first multifunctional heat accumulator to heat the second multifunctional heat accumulator or the first multifunctional heat accumulator. The multifunctional heat accumulator is utilized to absorb and remove CO2 and moisture in the fermentation odor, and meanwhile, the fermentation odor can be preheated; besides, through alternate switching of the reversing valves, the multifunctional heat accumulator is heated through high-temperature flue gas generated by odor combustion, and full utilization of waste heat can be achieved.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the field of organic fertilizer production, and particularly relates to an organic fertilizer production system and a production method. BACKGROUND

[0002] With the continuous strengthening of urbanization process in China, the amount of organic solid waste is increasing, and the research on using degradable organic solid waste to produce organic fertilizer is more, and the equipment is more, but there are generally the defects of high energy consumption, long fermentation period, long aging time and large occupied area. At the same time, during the treatment process, odor is easy to be produced, and if the odor is not effectively treated, it will have a great impact on people and environment. At present, in the engineering practical application, the main deodorization methods are chemical deodorization, water washing, physical adsorption, biological deodorization and thermal combustion method, among which the thermal combustion method has high deodorization efficiency and the odor substances are completely oxidized and decomposed, so it is widely used in small gas amount and high organic concentration odor treatment. However, due to the fact that the odor produced in the aerobic process contains a large amount of water (8-12%) and CO2 (7-15%), the existence of such impurities leads to the consumption of a large amount of fuel in the process of treating the odor by heat treatment, which increases the production cost and limits the application of the odor thermal combustion method. SUMMARY

[0003] The main purpose of the present application is to provide an organic fertilizer production system and a production method to overcome the defects of long fermentation period, long aging time and high deodorization energy consumption of the prior art organic fertilizer production.

[0004] In order to achieve the above purpose, the present application provides an organic fertilizer production system, comprising:

[0005] a fermentation system;

[0006] a deodorization system, comprising:

[0007] a first reversing valve connected with the fermentation system;

[0008] a combustion chamber;

[0009] a first multifunctional heat accumulator and a second multifunctional heat accumulator respectively communicating with the first reversing valve and the combustion chamber;

[0010] The fermentation system produces organic fertilizer and odor through fermentation, the odor alternately enters the first multifunctional heat accumulator or the second multifunctional heat accumulator for decarbonization and moisture removal and preheating under the adjustment of the first reversing valve, and then enters the combustion chamber for combustion; the flue gas generated by combustion flows into the second multifunctional heat accumulator or the first multifunctional heat accumulator to heat the second multifunctional heat accumulator or the first multifunctional heat accumulator.

[0011] The organic fertilizer production system provided by the present application further comprises:

[0012] An air preheating system, comprising:

[0013] A second reversing valve connected with the first reversing valve and the fermentation system respectively;

[0014] A third reversing valve;

[0015] A first heat storage body and a second heat storage body connected with the second reversing valve and the third reversing valve respectively;

[0016] The flue gas flowing out of the first multifunctional heat storage body or the second multifunctional heat storage body enters the first heat storage body or the second heat storage body alternately under the regulation of the first reversing valve and the second reversing valve, so as to heat the first heat storage body or the second heat storage body, and then is discharged from the system through the third reversing valve; air enters the second heat storage body or the first heat storage body for heat exchange under the regulation of the third reversing valve, and then enters the fermentation system through the second reversing valve.

[0017] The organic fertilizer production system, wherein, when the odor enters the first multifunctional heat storage body, the flue gas generated by combustion flows into the second multifunctional heat storage body; when the odor enters the second multifunctional heat storage body, the flue gas generated by combustion flows into the first multifunctional heat storage body.

[0018] The organic fertilizer production system, wherein, when the flue gas flowing out of the first multifunctional heat storage body or the second multifunctional heat storage body enters the first heat storage body under the regulation of the first reversing valve and the second reversing valve, air enters the second heat storage body under the regulation of the third reversing valve; when the flue gas flowing out of the first multifunctional heat storage body or the second multifunctional heat storage body enters the second heat storage body under the regulation of the first reversing valve and the second reversing valve, air enters the first heat storage body under the regulation of the third reversing valve.

[0019] The organic fertilizer production system, wherein, the first reversing valve is reversed once every 30-60 seconds; the second reversing valve and the third reversing valve are reversed once every 15-30 seconds.

[0020] The organic fertilizer production system, wherein, the first multifunctional heat storage body and the second multifunctional heat storage body are made of the same or different materials, and comprise 15wt%-30wt% of active components, 25wt%-40wt% of construction waste, 13wt%-20wt% of pyrolysis residues, 7-12wt% of foaming agents, 4wt%-8wt% of binders, and 5wt%-8wt% of extrusion aids; and / or, the active components comprise sodium carbonate and potassium carbonate, the pyrolysis residues are a mixture of carbon-containing and inorganic substances generated by pyrolysis of organic solid waste, the construction waste is recycled aggregate generated after treatment of waste generated in the construction industry, the foaming agent is urea, and the binder is sodium carboxymethyl cellulose.

[0021] The organic fertilizer production system, wherein the first heat accumulator and the second heat accumulator are made of the same or different materials, and comprise 35wt%-50wt% of construction waste, 15wt%-28wt% of pyrolysis residue, 5-10wt% of foaming agent, 5wt%-12wt% of binder, and 8wt%-15wt% of extrusion aid; and / or the pyrolysis residue is a mixture containing carbon and inorganic substances generated by pyrolysis of organic solid waste, the construction waste is recycled aggregate generated after treatment of waste generated in the construction industry, the foaming agent is urea, and the binder is sodium carboxymethyl cellulose.

[0022] The organic fertilizer production system, wherein the fermentation system comprises a pretreatment device and a fermentation device, the pretreatment device is used for crushing treatment of the organic solid waste, and the fermentation device is used for aerobic fermentation and aging of the organic solid waste.

[0023] The organic fertilizer production system, wherein the first reversing valve, the second reversing valve, and the third reversing valve are four-way reversing valves.

[0024] To achieve the above-mentioned purpose, the application further provides an organic fertilizer production method, which comprises the following steps:

[0025] Step 1: organic solid waste is fermented to generate organic fertilizer and odor, the odor is alternately introduced into the first multifunctional heat accumulator or the second multifunctional heat accumulator for decarbonization, moisture removal, and preheating under the adjustment of the first reversing valve, and then is introduced into a combustion chamber for combustion; the flue gas generated by combustion flows into the second multifunctional heat accumulator or the first multifunctional heat accumulator to heat the second multifunctional heat accumulator or the first multifunctional heat accumulator;

[0026] Step 2: the flue gas flowing out of the first multifunctional heat accumulator or the second multifunctional heat accumulator is alternately introduced into the first heat accumulator or the second heat accumulator for heating under the adjustment of the second reversing valve, and then is discharged from the system through the third reversing valve; air is introduced into the second heat accumulator or the first heat accumulator for heat exchange under the adjustment of the third reversing valve, and then is recycled for the fermentation of the organic solid waste through the second reversing valve.

[0027] The application has the following beneficial effects:

[0028] The application can absorb and remove CO2 and moisture in the fermentation odor in the multifunctional heat accumulator, and can preheat the fermentation odor; and the application can heat the multifunctional heat accumulator by high-temperature flue gas generated by combustion of the odor through the alternating switching of the reversing valve, so that the heat can be fully utilized. The application can save energy, reduce emissions, reduce production cost, improve the treatment efficiency of the odor, and improve the competitiveness of the organic fertilizer production. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an organic fertilizer production system according to an embodiment of the present invention. Detailed Implementation

[0030] The technical solution of the present invention will be described in detail below. The following embodiments are implemented under the premise of the technical solution of the present invention and a detailed implementation process is given. However, the protection scope of the present invention is not limited to the following embodiments. Structures or experimental methods that do not specify specific conditions in the following embodiments are generally performed under conventional conditions.

[0031] This invention provides an organic fertilizer production system; please refer to [link / reference]. Figure 1 The system includes a fermentation system and a deodorization system. The deodorization system comprises a first reversing valve, a combustion chamber, a first multi-functional heat storage body, and a second multi-functional heat storage body. The first reversing valve is connected to the fermentation system; the first and second multi-functional heat storage bodies are respectively connected to the first reversing valve and the combustion chamber.

[0032] The fermentation system produces organic fertilizer and odor through fermentation. Under the regulation of the first reversing valve, the odor alternately enters the first or second multi-functional heat storage body for decarbonization, dehumidification and preheating, and then enters the combustion chamber for combustion. The flue gas produced by combustion flows into the second or first multi-functional heat storage body to heat the second or first multi-functional heat storage body.

[0033] The odorous gases produced during fermentation contain moisture and carbon dioxide. The presence of these impurities necessitates significant fuel consumption for heat treatment, increasing production costs. This invention utilizes a multifunctional heat storage body to absorb and remove CO2 and moisture from the fermentation odorous gases, thus reducing energy consumption during combustion. Furthermore, while absorbing and removing CO2 and moisture, the multifunctional heat storage body also preheats the fermentation odorous gases. Moreover, by alternately switching reversing valves, the high-temperature flue gas generated from combustion is used to heat the multifunctional heat storage body, ensuring full utilization of heat. This method saves energy, reduces emissions, lowers production costs, improves odor treatment efficiency, and enhances the competitiveness of organic fertilizer production.

[0034] The fermentation system is not particularly limited in the present application, and any conventional fermentation system in the art can be used. In one embodiment, the fermentation system comprises a pretreatment device and a fermentation device in communication. In another embodiment, the pretreatment device comprises a crushing mechanism and a mixing mechanism. The organic solid waste is first introduced into the pretreatment device for treatment to meet the requirements of particle size, moisture content, etc., and then introduced into the fermentation device for fermentation, aging, and obtaining organic fertilizer. The generated odor can flow into the deodorization system for treatment. In a specific embodiment, the particle size of the organic solid waste after pretreatment is less than 20 mm, and the moisture content is adjusted to about 60%. In another embodiment, the fermentation device is a three-chamber fermentation tank, which comprises three chambers separated from each other, i.e., a fermentation chamber, a buffer chamber, and an aging chamber. In this way, the fermentation, composting, and aging processes can be realized in one fermentation device, thereby reducing the floor area and shortening the fermentation period.

[0035] In the deodorization system of the present application, the first reversing valve, the first multifunctional heat accumulator, the combustion chamber, and the second multifunctional heat accumulator are sequentially connected in a ring shape. By controlling the first reversing valve, the odor can be introduced into the first multifunctional heat accumulator, the combustion chamber, or the second multifunctional heat accumulator. When the odor enters the first multifunctional heat accumulator, the first multifunctional heat accumulator absorbs CO2 and moisture in the odor and preheats the odor using the heat accumulated therein. At this time, the flue gas generated by combustion in the combustion chamber flows into the second multifunctional heat accumulator to heat it, so that the second multifunctional heat accumulator can accumulate heat. The flue gas flowing out of the second multifunctional heat accumulator has a reduced temperature and can be discharged from the deodorization system through the first reversing valve or used again. Similarly, when the odor enters the second multifunctional heat accumulator, the second multifunctional heat accumulator absorbs CO2 and moisture in the odor and preheats the odor using the heat accumulated therein. At this time, the flue gas generated by combustion in the combustion chamber flows into the first multifunctional heat accumulator to heat it, so that the first multifunctional heat accumulator can accumulate heat. The flue gas flowing out of the first multifunctional heat accumulator has a reduced temperature and can be discharged from the deodorization system through the first reversing valve or used again. By providing the first reversing valve, the multifunctional heat accumulators can alternately accumulate and release heat, which is beneficial to the full utilization of heat.

[0036] In one embodiment, the first reversing valve is reversed every 30-60 seconds, i.e., the period of heat accumulation and release of the multifunctional heat accumulators is 1-2 minutes.

[0037] The first reversing valve is not particularly limited in the present application, as long as it can achieve the above-mentioned adjusting function. In one embodiment, the first reversing valve of the present application is a four-way reversing valve.

[0038] The combustion chamber is not particularly limited in the present application and is mainly used for odor combustion. In one embodiment, fuel gas is introduced into the combustion chamber for odor combustion.

[0039] The first multifunctional heat accumulator and the second multifunctional heat accumulator are the same or different in material, and comprise an active component and aggregate, the active component can remove CO2 and moisture from odor, and the aggregate such as pyrolysis residue and construction waste can realize heat storage and heat release. In an embodiment, the first multifunctional heat accumulator and the second multifunctional heat accumulator comprise 15wt%-30wt% of the active component, 25wt%-40wt% of the construction waste, 13wt%-20wt% of the pyrolysis residue, 7-12wt% of the foaming agent, 4wt%-8wt% of the binder, and 5wt%-8wt% of the extrusion aid. In another embodiment, the active component comprises sodium carbonate and potassium carbonate, the pyrolysis residue is a mixture containing carbon and inorganic substances generated by pyrolysis of organic solid waste, the construction waste is recycled aggregate generated after treatment of waste generated in the construction industry, the foaming agent is urea, and the binder is sodium carboxymethyl cellulose. The extrusion aid is not particularly limited in the present application, and conventional extrusion aids in the art can be used. The present application can effectively preheat odor by using special multifunctional heat accumulators, so that low-calorific-value gas (≥800 Kcal / Nm 3 ) can be used for odor combustion, and production cost can be reduced by 10-25%.

[0040] In an embodiment, the organic fertilizer production system of the present application further comprises an air preheating system, the air preheating system comprises a second reversing valve, a third reversing valve, a first heat accumulator, and a second heat accumulator. The second reversing valve is connected with the first reversing valve and the fermentation system, respectively; the first heat accumulator and the second heat accumulator are in communication with the second reversing valve and the third reversing valve, respectively.

[0041] The flue gas flowing out of the first multifunctional heat accumulator or the second multifunctional heat accumulator enters the first heat accumulator or the second heat accumulator alternately under the adjustment of the second reversing valve through the first reversing valve, so as to heat the first heat accumulator or the second heat accumulator, and then is discharged from the system through the third reversing valve; the air enters the second heat accumulator or the first heat accumulator for heat exchange under the adjustment of the third reversing valve, and then enters the fermentation system through the second reversing valve.

[0042] The flue gas flowing out of the first multifunctional heat accumulator or the second multifunctional heat accumulator enters the first heat accumulator or the second heat accumulator alternately under the adjustment of the second reversing valve through the first reversing valve, so as to heat the first heat accumulator or the second heat accumulator, and then is discharged from the system through the third reversing valve; the air enters the second heat accumulator or the first heat accumulator for heat exchange under the adjustment of the third reversing valve, and then enters the fermentation system through the second reversing valve.

[0043] In the air preheating system, the second reversing valve, the first heat accumulator, the third reversing valve and the second heat accumulator are sequentially communicated to form a ring-like communication. The third reversing valve is communicated with air, and in an embodiment, the third reversing valve is communicated with compressed air, for example, with a compressed air storage tank. Through the control of the third reversing valve, the air can enter the first heat accumulator or the second heat accumulator. When the air enters the first heat accumulator, the first heat accumulator preheats the air by using the heat accumulated by itself, and the preheated air (70-80℃) enters the fermentation system through the second reversing valve. At this time, the flue gas passes through the first reversing valve and flows into the second heat accumulator under the adjustment of the second reversing valve to heat the second heat accumulator, so that the second heat accumulator can accumulate heat. The temperature of the flue gas after passing through the second heat accumulator is lowered again, and the flue gas can flow out of the air preheating system through the third reversing valve. Similarly, when the air enters the second heat accumulator, the second heat accumulator preheats the air by using the heat accumulated by itself, and the preheated air enters the fermentation system through the second reversing valve. At this time, the flue gas passes through the first reversing valve and flows into the first heat accumulator under the adjustment of the second reversing valve to heat the first heat accumulator, so that the first heat accumulator can accumulate heat. The flue gas flowing out of the first heat accumulator is lowered in temperature again, and the flue gas can flow out of the air preheating system through the third reversing valve. Through the arrangement of the second reversing valve and the third reversing valve, the heat accumulators can realize alternating heat accumulation and heat release, which is beneficial to the full utilization of heat, and through the preheating of the air, the fermentation and aging efficiency can be improved, and the fermentation and aging time can be shortened.

[0044] The second reversing valve and the third reversing valve of the present application simultaneously reverse, and in an embodiment, the reversing is performed once every 15-30 seconds, that is, the period of heat accumulation and heat release of the heat accumulators is 0.5-1 minute.

[0045] The second reversing valve and the third reversing valve of the present application are not particularly limited as long as they can realize the above-mentioned adjustment function. In an embodiment, the second reversing valve and the third reversing valve of the present application are four-way reversing valves.

[0046] The first heat accumulator and the second heat accumulator of the present application can be of the same material or different materials, as long as they can realize the functions of heat accumulation and heat release. In an embodiment, the first heat accumulator and the second heat accumulator of the present application comprise 35wt%-50wt% of construction waste, 15wt%-28wt% of pyrolysis residue, 5-10wt% of foaming agent, 5wt%-12wt% of binder and 8wt%-15wt% of extrusion aid. In another embodiment, the pyrolysis residue is a mixture containing carbon and inorganic substances generated by the pyrolysis of organic solid waste, the construction waste is recycled aggregate generated by the treatment of waste generated in the construction industry, the foaming agent is urea, and the binder is sodium carboxymethyl cellulose. The extrusion aid of the present application is not particularly limited, and conventional extrusion aids in the art can be used. The present application can effectively preheat the air used for fermentation by using special heat accumulators, which can improve the fermentation efficiency and save energy consumption.

[0047] The present application also provides a method for producing organic fertilizer, which can use the organic fertilizer production system described above, comprising the following steps:

[0048] Step 1, organic solid waste is fermented to produce organic fertilizer and odor, the odor is alternately introduced into the first multifunctional regenerator or the second multifunctional regenerator for decarburization and moisture removal and preheating under the regulation of the first reversing valve, and then introduced into the combustion chamber for combustion; the flue gas generated by combustion flows into the second multifunctional regenerator or the first multifunctional regenerator to heat the second multifunctional regenerator or the first multifunctional regenerator;

[0049] Step 2, the flue gas flowing out of the first multifunctional regenerator or the second multifunctional regenerator is alternately introduced into the first regenerator or the second regenerator for heating under the regulation of the second reversing valve, and then discharged from the system through the third reversing valve; air is introduced into the second regenerator or the first regenerator for heat exchange under the regulation of the third reversing valve, and then recycled for the fermentation of the organic solid waste through the second reversing valve.

[0050] In an embodiment, the organic solid waste is first sent to a pretreatment device for pretreatment, such as crushing and mixing, so that the particle size and moisture content of the organic solid waste meet the requirements. In another embodiment, the particle size of the pretreated organic solid waste is ≤20 mm, and the moisture content is about 60%. The pretreated organic solid waste is introduced into a fermentation device for fermentation and aging to produce organic fertilizer. In the present application, the residence time of the organic solid waste in the fermentation tank is 8-12 days, such as about 10 days. The fermentation conditions and aging conditions in the present application are not particularly limited, and the conventional conditions in the art can be used.

[0051] The fermentation device generates odor during fermentation, which is alternately transported to the first multifunctional regenerator or the second multifunctional regenerator for decarburization and moisture removal and heat storage treatment, i.e., the first multifunctional regenerator and the second multifunctional regenerator alternately perform decarburization and moisture removal and heating on the odor generated by fermentation, and then transport the odor to the combustion chamber for combustion under the action of fuel gas. At the same time, the second multifunctional regenerator or the first multifunctional regenerator which has not been subjected to decarburization and moisture removal and heating is heated by the high-temperature flue gas generated by combustion to store heat, and the adsorbed carbon dioxide and water are also taken away by the flue gas.

[0052] In an embodiment, the odor is heated by the first multifunctional regenerator or the second multifunctional regenerator, and the temperature is increased to about 350-400 DEG C, the moisture is decreased to 1 vol% -1.6 vol%, the carbon dioxide concentration is decreased to 1.5 vol% -2.25 vol%, and the combustible concentration of the odor treated by the multifunctional regenerator is increased by 13 vol% -26 vol%. The odor is treated by combustion to generate high-temperature flue gas of 600-700 DEG C, and the high-temperature flue gas is used to heat the multifunctional regenerator to 450-500 DEG C, and at the same time, the high-temperature flue gas is cooled to low-temperature flue gas (150-200 DEG C).

[0053] In an embodiment, the odor alternately enters the first multifunctional regenerator or the second multifunctional regenerator for 30-60 seconds, and the period of heat storage and release of the multifunctional regenerator is 1-2 minutes.

[0054] The flue gas flowing out of the first multifunctional regenerator or the second multifunctional regenerator has a temperature of 150-200 DEG C, and alternately enters the first regenerator or the second regenerator after the first reversing valve and the second reversing valve, and the first regenerator or the second regenerator is heated to about 135-165 DEG C, and the flue gas is cooled to 50-60 DEG C. At the same time, air enters the second regenerator or the first regenerator which is not heated to be preheated through the third reversing valve, and the preheating temperature is generally about 70 DEG C-80 DEG C, and then enters the fermentation system, for example, is used for aeration and drying in the fermentation device.

[0055] In an embodiment, the flue gas alternately enters the first regenerator or the second regenerator for 15-30 seconds, and the period of heat storage and release of the regenerator is 0.5-1 minute.

[0056] The present application exchanges heat between the first multifunctional regenerator, the second multifunctional regenerator, the first regenerator, the second regenerator, the high-temperature flue gas and the low-temperature flue gas, temporarily stores energy, and then exchanges heat with compressed air and odor to generate hot air (about 70 DEG C) and hot odor (about 400-450 DEG C), so that the energy utilization efficiency of the whole system is greatly improved, and the cost is saved.

[0057] The present application combines the deodorization system and the air preheating system through the reversing valve, so that the whole system is compact in structure and convenient to operate. The periodical reversing of the reversing valve enables the heat to be continuously and timely conducted out for further use of the waste heat.

[0058] In a specific embodiment, the method for producing organic fertilizer comprises the following steps:

[0059] The fermentation produced odor gas is communicated with the second multifunctional regenerator through the first reversing valve for decarburization, moisture removal and preheating, and then enters the combustion chamber together with the fuel gas to produce high-temperature flue gas, which passes through the first multifunctional regenerator and heats it, and the low-temperature flue gas enters the first regenerator through the connected first and second reversing valves, and then is discharged through the flue gas pipeline connected by the third reversing valve after heating the first regenerator.

[0060] After a certain time is set, the first, second and third reversing valves are reversed. The fermentation produced odor gas is communicated with the first multifunctional regenerator through the first reversing valve for decarburization, moisture removal and preheating, and then enters the combustion chamber together with the fuel gas to produce high-temperature flue gas, which passes through the second multifunctional regenerator and heats it, and the low-temperature flue gas enters the second regenerator through the connected first and second reversing valves, and then is discharged through the flue gas pipeline connected by the third reversing valve after heating the second regenerator. The preheated compressed air enters the fermentation device to provide heat for fermentation, accelerate fermentation efficiency, and reduce operation time.

[0061] The technical scheme of the present application completes decarburization, moisture removal, heat storage, preheating, and carbon dioxide and water resolution at the same time, improves energy utilization efficiency, has remarkable energy-saving and emission-reducing effect, shortens fermentation period, has low operation cost, high fermentation efficiency, and strong competitiveness of organic fertilizer products.

[0062] The technical scheme of the present application will be further described in detail through examples. The values of process conditions taken in the following examples are exemplary, and the value range can be shown as described above.

[0063] Example 1

[0064] The municipal sludge is used as raw material, and the water content is about 80wt%; the straw is used as auxiliary material, the particle size is ≤20mm, and the water content is about 15wt%; the sludge return mixed material has a water content of about 40wt%. After the sludge, straw and return mixed material are mixed according to the mass ratio of 10:5.5:1, the water content is adjusted to about 60wt%, and then they are sent into a three-cavity aerobic fermentation tank for organic fertilizer production. The material stays in the fermentation tank for 10d, and according to the actual engineering test, taking the treatment capacity of 400t / d as an example, 125.85t / d of organic fertilizer can be produced per day, and the water content is 30.11wt%. The fermentation produced odor gas is subjected to carbon and moisture removal through the multifunctional regenerator, the water content is reduced to 1.48wt%, the carbon dioxide concentration is reduced to 2.06vol%, and the combustible gas concentration of the treated odor gas is increased by 18.56vol%.

[0065] The high-temperature flue gas at 550℃ is changed into low-temperature flue gas at 165℃ after being treated by the multifunctional regenerator, the low-temperature flue gas heats the regenerator to about 135℃, the compressed air is heated to 65℃ by the regenerator and then is sent into the aeration and stirring system of the fermentation tank. According to the calculation, the whole process can save energy by about 30% for the system, and the production cost is reduced by 26.5yuan / ton.

[0066] The multifunctional heat accumulator used includes 21wt% of active components, 36wt% of construction waste, 15wt% of pyrolysis residues, 9.5wt% of foaming agent, 11wt% of binder and 7.5wt% of extrusion aid; the heat accumulator includes 41wt% of construction waste, 26.5wt% of pyrolysis residues, 8.5wt% of foaming agent, 11wt% of binder and 13wt% of extrusion aid.

[0067] Example 2

[0068] The human feces is used as raw material, and the water content is about 75wt%; the rice husk is used as auxiliary material, the particle size is ≤20mm, and the water content is about 10wt%; the water content of the returned material is about 40wt%. The feces, the rice husk and the returned material are mixed according to the mass ratio of 5.5:1.5:1, the water content is adjusted to 60.56wt%, and then the mixture is sent into a three-cavity aerobic fermentation tank for organic fertilizer production. The material stays in the fermentation tank for 9.5d, and according to the actual engineering test, taking the processing capacity of 218t / d as an example, 108.27t / d of organic fertilizer with a water content of 31wt% can be produced per day. The odor generated during fermentation is treated by the multifunctional heat accumulator, and the water content is reduced to 1.2wt%, the carbon dioxide concentration is reduced to 1.86vol%, and the combustible matter concentration of the treated odor is increased by 21.3vol%.

[0069] The high-temperature flue gas at 600℃ is treated by the multifunctional heat accumulator and becomes low-temperature flue gas at 180℃, the low-temperature flue gas heats the heat accumulator to about 150℃, the compressed air is heated to 72℃ by the heat accumulator and then is sent into the aeration and stirring system of the fermentation tank. According to the calculation, the whole process can save energy by about 26% and reduce the production cost by 22.4yuan / ton.

[0070] The multifunctional heat accumulator used includes 21wt% of active components, 36wt% of construction waste, 15wt% of pyrolysis residues, 9.5wt% of foaming agent, 11wt% of binder and 7.5wt% of extrusion aid; the heat accumulator includes 41wt% of construction waste, 26.5wt% of pyrolysis residues, 8.5wt% of foaming agent, 11wt% of binder and 13wt% of extrusion aid.

[0071] As can be seen from the above examples, the technical scheme of the present application can remove carbon dioxide and water in the odor, and at the same time, the waste heat in the flue gas can be recycled, so that the purposes of energy saving and emission reduction, improving energy utilization efficiency, shortening fermentation period, improving efficiency and reducing production cost are achieved.

[0072] Of course, the present application can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application, and these corresponding changes and modifications shall all belong to the protection scope of the claims of the present application.

Claims

1. An organic fertilizer production system characterized by, The system comprises: a fermentation system; a deodorization system comprising: a first reversing valve connected to the fermentation system; a combustion chamber; a first multifunctional regenerator and a second multifunctional regenerator respectively connected to the first reversing valve and the combustion chamber; the fermentation system produces organic fertilizer and odor through fermentation, the odor alternately enters the first multifunctional regenerator or the second multifunctional regenerator for decarbonization and preheating under the regulation of the first reversing valve, and then enters the combustion chamber for combustion; the flue gas generated by combustion flows into the second multifunctional regenerator or the first multifunctional regenerator to heat the second multifunctional regenerator or the first multifunctional regenerator.

2. The organic fertilizer production system according to claim 1, characterized by, The system further comprises: an air preheating system comprising: a second reversing valve connected to the first reversing valve and the fermentation system respectively; a third reversing valve; a first regenerator and a second regenerator respectively connected to the second reversing valve and the third reversing valve; the flue gas flowing out of the first multifunctional regenerator or the second multifunctional regenerator alternately enters the first regenerator or the second regenerator under the regulation of the second reversing valve through the first reversing valve, to heat the first regenerator or the second regenerator, and then is discharged from the system through the third reversing valve; air enters the second regenerator or the first regenerator for heat exchange under the regulation of the third reversing valve, and then enters the fermentation system through the second reversing valve.

3. The organic fertilizer production system according to claim 1, characterized by, When the odor enters the first multifunctional regenerator, the flue gas generated by combustion flows into the second multifunctional regenerator; when the odor enters the second multifunctional regenerator, the flue gas generated by combustion flows into the first multifunctional regenerator.

4. The organic fertilizer production system according to claim 2, characterized by, When the flue gas flowing out of the first multifunctional regenerator or the second multifunctional regenerator enters the first regenerator under the regulation of the second reversing valve through the first reversing valve, air enters the second regenerator under the regulation of the third reversing valve; when the flue gas flowing out of the first multifunctional regenerator or the second multifunctional regenerator enters the second regenerator under the regulation of the second reversing valve through the first reversing valve, air enters the first regenerator under the regulation of the third reversing valve.

5. The organic fertilizer production system according to claim 2, characterized by, The first reversing valve is reversed every 30-60 seconds; the second reversing valve and the third reversing valve are reversed every 15-30 seconds.

6. The organic fertilizer production system according to claim 1, characterized by, The first multifunctional regenerator and the second multifunctional regenerator are made of the same or different materials, comprising 15wt%-30wt% of active components, 25wt%-40wt% of construction waste, 13wt%-20wt% of pyrolysis residues, 7-12wt% of foaming agents, 4wt%-8wt% of binders, and 5wt%-8wt% of extrusion aids; and / or, the active components comprise sodium carbonate and potassium carbonate, the pyrolysis residues are a mixture of carbon-containing and inorganic substances generated by pyrolysis of organic solid waste, the construction waste is recycled aggregate generated after treatment of waste generated in the construction industry, the foaming agent is urea, and the binder is sodium carboxymethyl cellulose.

7. The organic fertilizer production system according to claim 2, characterized by, The first and second heat accumulators have the same or different materials, including 35wt%-50wt% of construction waste, 15wt%-28wt% of pyrolysis residue, 5-10wt% of foaming agent, 5wt%-12wt% of binder, and 8wt%-15wt% of extrusion aid; and / or, the pyrolysis residue is a mixture containing carbon and inorganic matter generated by pyrolysis of organic solid waste, the construction waste is recycled aggregate generated after treatment of waste generated in the construction industry, the foaming agent is urea, and the binder is sodium carboxymethyl cellulose.

8. The organic fertilizer production system according to claim 1, characterized by, The fermentation system comprises a pretreatment device for crushing the organic solid waste and a fermentation device for aerobic fermentation and aging of the organic solid waste.

9. The organic fertilizer production system according to claim 2, characterized by, The first, second and third reversing valves are four-way reversing valves.

10. A method for producing organic fertilizer, characterized by, The organic fertilizer production system of any one of claims 1-9 comprises the following steps: Step 1: organic solid waste is fermented to produce organic fertilizer and odor, the odor is alternately introduced into the first or second multifunctional heat accumulator for decarbonization and preheating under the regulation of the first reversing valve, and then is introduced into the combustion chamber for combustion; the flue gas generated by combustion flows into the second or first multifunctional heat accumulator to heat the second or first multifunctional heat accumulator; Step 2: the flue gas flowing out of the first or second multifunctional heat accumulator is alternately introduced into the first or second heat accumulator under the regulation of the second reversing valve via the first reversing valve to heat the first or second heat accumulator, and then is discharged from the system via the third reversing valve; air is introduced into the second or first heat accumulator for heat exchange under the regulation of the third reversing valve, and then is circulated for the fermentation of the organic solid waste via the second reversing valve.

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