Energy-saving compound fertilizer drying system based on natural gas distributed energy

Abstract

The utility model discloses an energy-saving compound fertilizer drying system based on natural gas distributed energy. The energy-saving compound fertilizer drying system comprises a gas compressor, a turbine, a cooling fan, a dryer, an air preheater, a tail gas processor and a combustion chamber. According to the energy-saving type compound fertilizer drying system based on the natural gas distributed energy, the natural gas distributed energy supply system can serve as a standby power supply for key electricity of a plant area, dependence on a power grid is greatly reduced, and electricity utilization safety is improved; meanwhile, by adopting the distributed energy supply system, the power distribution capacity scale of a factory area can be reduced, the standard electric charge or the transformer capacity cost can be reduced, the drying machine is arranged to replace a hot blast stove in a traditional drying system, energy gradient utilization of high-level energy power generation and low-level energy heat supply is achieved, the primary energy utilization rate is effectively increased, and the energy utilization rate is increased. The current situation that high-grade energy sources such as gas, oil and electricity are directly used for combustion for heat supply in traditional compound fertilizer drying is changed.

Description

Technical Field

[0001] The utility model relates to a compound fertilizer drying system, in particular to an energy-saving compound fertilizer drying system based on natural gas distributed energy. Background Art

[0002] Since the traditional compound fertilizer production line drying process directly burns the gas in a hot air furnace to generate high-temperature flue gas that is mixed with sufficient air to a certain temperature (450-550°C), and then directly heats the compound fertilizer particles in the drying furnace, the primary energy utilization rate is low and has become increasingly unsuitable for the requirements of efficient energy cascade utilization. How to solve this problem is the primary task facing compound fertilizer production companies.

[0003] The natural gas distributed energy system realizes the cascade utilization of energy through combined heat and power, with a comprehensive energy utilization efficiency of more than 70%, and realizes energy supply near the load center. Compared with the traditional centralized energy supply method, the natural gas distributed energy supply reduces the investment in the transmission and distribution system and energy loss, and has the advantages of energy saving and high efficiency, clean and environmental protection, peak shaving and valley filling, safety and economy, and has broad development prospects.

[0004] The disclosure (announcement) number is CN105135838A, and the disclosure (announcement) date is 2015-12-09, which discloses a compound fertilizer drying system. The disclosed prior art is the traditional direct combustion of natural gas and other high-quality energy for heating. If the natural gas distributed energy technology and compound fertilizer drying technology can be combined, the current situation of the traditional direct combustion of natural gas and other high-quality energy for heating can be changed, thereby realizing efficient cascade utilization of energy and avoiding energy waste. Utility Model Content

[0005] The purpose of the utility model is to provide an energy-saving compound fertilizer drying system based on natural gas distributed energy to solve the above problems.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The invention discloses an energy-saving compound fertilizer drying system based on natural gas distributed energy, which comprises a compressor, a turbine, a cooling fan, a dryer, an air preheater, an exhaust gas processor and a combustion chamber.

[0008] Preferably, the compressor air outlet is connected to the air inlet of the combustion chamber.

[0009] Preferably, the high-temperature flue gas from the combustion chamber is connected to the turbine inlet.

[0010] Preferably, the high-temperature flue gas outlet of the turbine is connected to the heating heat source inlet pipeline of the dryer.

[0011] Preferably, the cold air outlet of the cooling fan is connected to the pipeline from the turbine to the dryer, and a temperature monitoring point is provided on the pipeline, and a sensor is provided at the temperature monitoring point.

[0012] Preferably, the exhaust gas outlet of the dryer is connected to the flue gas inlet pipeline of the air preheater.

[0013] Preferably, the flue gas outlet of the air preheater is connected to the exhaust gas inlet of the exhaust gas processor.

[0014] Preferably, the exhaust gas processor comprises a dust removal device, a pickling device, and a water washing device.

[0015] Preferably, the dryer is a variable frequency cooling fan.

[0016] In the above technical scheme, the utility model provides an energy-saving compound fertilizer drying system based on natural gas distributed energy, which has the following beneficial effects:

[0017] 1) By installing a dryer to replace the hot air furnace in the traditional drying system, the energy cascade utilization of high-potential energy for power generation and low-potential energy for heating is realized, which effectively improves the utilization rate of primary energy and changes the current situation of direct use of high-grade energy such as gas, oil, and electricity for heating in traditional compound fertilizer drying;

[0018] 2) The natural gas distributed energy supply system can serve as a backup power source for key power consumption in the plant area, greatly reducing the dependence on the power grid and improving the safety of electricity use; at the same time, the use of the distributed energy supply system can reduce the scale of power distribution capacity in the plant area and reduce the base electricity fee or transformer capacity fee;

[0019] 3) By setting up an air preheater, the waste heat of the flue gas at the end of the dryer is used to heat the compressor inlet air, further improving energy utilization efficiency;

[0020] 4) Use temperature monitoring and sensors to obtain temperature and humidity, so as to control the variable frequency cooling fan to make intelligent changes in wind speed and temperature to ensure drying quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the organizational structure provided for the embodiment of the utility model

[0023] Description of reference numerals:

[0024] 1. Compressor; 2. Turbine; 3. Cooling fan; 4. Dryer; 5. Air preheater; 6. Exhaust gas processor; 7. Combustion chamber. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1 As shown, an energy-saving compound fertilizer drying system based on natural gas distributed energy includes a compressor 1, a turbine 2, a cooling fan 3, a dryer 4, an air preheater 5, an exhaust gas processor 6 (including a dust removal device, a pickling device, and a water washing device) and a combustion chamber 7, and completes the following steps:

[0027] S01, compressor 1 compresses air and transmits it to combustion chamber 7, combustion chamber 7 generates high temperature, and flows into turbine 3 to expand under the action of heat to make the generator run;

[0028] S02, the cooling fan 3 extracts air and conveys it to the exhaust duct of the turbine 1 for mixing, reduces it to a predetermined temperature and enters the dryer 4 to directly heat the compound fertilizer so that the compound fertilizer reaches a predetermined moisture content;

[0029] S03. The exhaust pipe of the dryer 4 is connected to the smoke inlet of the air preheater 5, and the air preheater 5 is used to preheat the intake air of the compressor 1, and the exhaust gas processor 6 processes and discharges the exhaust gas of the air preheater 5.

[0030] Specifically: the air outlet of the compressor 1 is connected to the air inlet of the combustion chamber 7. The high-temperature flue gas of the combustion chamber 7 is connected to the inlet of the turbine 2. The high-temperature flue gas outlet of the turbine 2 is connected to the heating heat source inlet pipeline of the dryer 4. The cold air outlet of the cooling fan 3 is connected to the pipeline between the turbine 2 and the dryer 4. The exhaust gas outlet of the dryer 4 is connected to the flue gas inlet pipeline of the air preheater 5. The flue gas outlet of the air preheater 5 is connected to the exhaust gas inlet of the exhaust gas processor 6.

[0031] In the above technology, by installing a dryer to replace the hot air furnace in the traditional drying system, the cascade utilization of high-level energy for power generation and low-level energy for heating is realized, which effectively improves the primary energy utilization rate and changes the current situation of traditional compound fertilizer drying that directly uses high-grade energy such as gas, oil, and electricity for heating. The natural gas distributed energy supply system can serve as a backup power supply for key electricity use in the plant area, greatly reducing dependence on the power grid and improving the safety of electricity use. At the same time, the use of a distributed energy supply system can reduce the scale of the plant's power distribution capacity and reduce the benchmark electricity fee or transformer capacity fee. Furthermore, by installing an air preheater, the waste heat of the flue gas at the tail of the dryer is utilized in a cascade manner to heat the compressor inlet air, further improving energy utilization efficiency. Secondly, by installing a variable frequency cooling fan, temperature monitoring and sensors, intelligent control of the dryer temperature is achieved to ensure drying quality.

[0032] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other. The above is only an embodiment of the embodiment of this specification and is not intended to limit the embodiment of this specification. For those skilled in the art, the embodiment of this specification may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiment of this specification shall be included in the scope of the claims of the embodiment of this specification.

Claims

1. An energy-saving compound fertilizer drying system based on natural gas distributed energy, characterized in that: It comprises a compressor (1), a turbine (2), a cooling fan (3), a dryer (4), an air preheater (5), an exhaust gas processor (6) and a combustion chamber (7); The air outlet of the compressor (1) is connected to the air inlet of the combustion chamber (7); The high-temperature flue gas of the combustion chamber (7) is connected to the inlet of the turbine (2); The high-temperature flue gas outlet of the turbine (2) is connected to the heating heat source inlet pipeline of the dryer (4); The cold air outlet of the cooling fan (3) is connected to the pipeline from the turbine (2) to the dryer (4), and a temperature monitoring point is arranged on the pipeline, and a sensor is arranged at the temperature monitoring point; The tail gas outlet of the dryer (4) is connected to the smoke gas inlet pipeline of the air preheater (5); The flue gas outlet of the air preheater (5) is connected to the exhaust gas inlet of the exhaust gas processor (6).

2. The energy-saving compound fertilizer drying system based on natural gas distributed energy according to claim 1 is characterized in that: The tail gas processor (6) comprises a dust removal device, a pickling device and a water washing device.

3. The energy-saving compound fertilizer drying system based on natural gas distributed energy according to claim 1 is characterized in that: The drying machine (4) is a variable frequency cooling fan.

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