Mine pit antifreeze air heating device based on methanol nanocatalytic oxidation

Abstract

The invention discloses a mine wellhead antifreeze air heating device based on methanol nano-catalytic oxidation, and belongs to the technical field of mine wellhead antifreeze air heating devices. The technical problem to be solved is: to provide an improvement in the structure of a mine wellhead antifreeze air heating device based on methanol nano-catalytic oxidation; the technical scheme adopted to solve the technical problem is: comprising a reaction device and a heating device arranged on a mounting base, the reaction device and the heating device are arranged side by side, the reaction device is a multi-cavity box body composed of multiple steel plates, a reaction bed waste heat cavity, a fresh air exchange cavity, and an initial air heat exchange cavity are sequentially arranged inside the reaction device from bottom to top, an evaporation heat exchange cavity is arranged inside the heating device, a plurality of exchanger heat pipes are vertically arranged in the evaporation heat exchange cavity, a hot air outlet is arranged at one end of the heating device, and a hot air inlet is arranged at the other end of the heating device; the invention is applied to a mine wellhead air heating device.

Description

Technical Field

[0001] The invention discloses a mine wellhead antifreeze air heating device based on methanol nano-catalytic oxidation, and belongs to the technical field of mine wellhead antifreeze air heating devices. Background Art

[0002] When the cold wind enters the coal mine air inlet well in winter, it will come into contact with the water vapor and humid air in the well, and it is easy to freeze on the well wall and shaft beam. In severe cases, it will block the cross-section at the wellhead, affecting the air flow and exhaust in the well, posing a safety hazard. The underground mine safety regulations require that the air temperature in the wellhead must be kept above 2°C. Therefore, anti-freezing of the wellhead is an important guarantee for safe production in coal mines in winter.

[0003] At present, there are three main antifreeze heating methods for the air inlet wells of coal mines, namely, hot air furnaces that burn coal as the heat source and boilers that burn liquefied petroleum gas or natural gas to provide hot air. The above types of boilers are complicated to operate, and the auxiliary water treatment brings high labor operation costs, and the exhaust gas emitted by the boilers will also pollute the environment; the above types of boilers will produce a large amount of nitrogen oxides in the heating process. The environmental protection department requires the emission standard of nitrogen oxides to be below 30mg, and the existing boiler system needs to be improved in process and structure to meet the emission index requirements; in addition, since most coal mines are located in remote locations and vehicle transportation and delivery routes are long, it is necessary to build natural gas storage and gasification equipment in the coal mines, which brings corresponding storage and use risks to the coal mines. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the present invention aims to solve the technical problem of providing an improved structure of a mine wellhead antifreeze air heating device based on methanol nano-catalytic oxidation.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a mine wellhead antifreeze air heating device based on methanol nano-catalytic oxidation, comprising a reaction device and a heating device arranged on a mounting base, the reaction device and the heating device are arranged side by side, the reaction device is a multi-cavity box composed of multiple steel plates, the reaction bed waste heat chamber, the fresh air exchange chamber, and the initial air heat exchange chamber are arranged in sequence from bottom to top inside the reaction device, an evaporation heat exchange chamber is arranged inside the heating device, and multiple exchanger heat pipes are vertically arranged in the evaporation heat exchange chamber, a hot air outlet is arranged at one end of the heating device, and a hot air inlet is arranged at the other end of the heating device;

[0006] A plurality of hot reaction beds are fixedly arranged in the initial air heat exchange chamber of the reaction device, an upper cover is arranged on the top of the hot reaction bed, a mixed gas distributor is arranged on the outer side of the upper cover, the bottom of the upper cover is connected and fixed to the upper plate by bolts, the upper plate is specifically a sealing welding plate with a plurality of through holes, a reaction tube is arranged in each through hole of the upper plate, the reaction tube passes through the middle dividing plate and is connected to the through hole arranged on the lower plate, and a warping piece is also arranged on the surface of each reaction tube;

[0007] The reaction tubes in each thermal reaction bed from the upper plate to the middle plate are encapsulated in the initial air heat exchange chamber;

[0008] The reaction tubes from the middle dividing plate to the lower plate in each thermal reaction bed are encapsulated in a fresh air exchange chamber;

[0009] The bottom of the lower plate is connected to the residual heat chamber of the reaction bed;

[0010] An air inlet is arranged at one end of the fresh air exchange chamber, a fresh air box is arranged outside the air inlet, a fresh air filter membrane is arranged outside the fresh air box, an air outlet is arranged at the other end of the fresh air exchange chamber, the air outlet is connected to the fresh air main pipeline, a plurality of thermal reaction bed branch pipelines are connected to the fresh air main pipeline, a fresh air proportion control valve and a methanol atomizing nozzle valve group are also arranged on each thermal reaction bed branch pipeline, the methanol atomizing nozzle valve group is connected to the methanol feeding system valve group through a methanol output pipeline, and the methanol feeding system valve group is connected to the methanol storage tank through a methanol input pipeline;

[0011] A cold air inlet is provided at one end of the initial air heat exchange chamber, and an initial air heat exchange outlet is provided at the other end of the initial air heat exchange chamber, and the initial air heat exchange outlet is connected to the hot air inlet through a heat exchange air delivery pipeline;

[0012] A window is also provided on one side of the reaction bed waste heat chamber, and the reaction bed waste heat chamber is connected with the evaporation heat exchange chamber through the window;

[0013] A fresh air fan is also provided at the air inlet of the fresh air exchange chamber, and a temperature sensor is also provided inside the fresh air main duct.

[0014] A tail gas waste heat discharge port is also provided on one side of the bottom of the heating device, and an upper cover plate is also provided on the top of the heating device.

[0015] The signal input ends of the fresh air proportion control valve, the methanol atomizing nozzle valve group, and the methanol feeding system valve group are all connected to the air heating controller through wires;

[0016] The control end of the fresh air fan is connected to the air heating controller through a wire;

[0017] The signal output end of the temperature sensor is connected to the air heating controller through a wire.

[0018] A packaging box is also arranged around the reaction device and the heating device.

[0019] Compared with the prior art, the present invention has the following beneficial effects: compared with the three traditional wellhead heating methods, the present invention provides an air heating device based on methanol nano-catalytic oxidation technology, which can realize flameless combustion of air during the heating process and maintain zero emission of polluting tail gases such as nitrogen oxides; the device gets rid of the reliance on the process of preparing softened water during operation, which can reduce the waste of water resources and the discharge of high-salt water; the heating device provided by the present invention solves the problem of on-site installation, and solves the energy loss and construction cost of water supply and drainage and steam pipelines. The device has a thermal efficiency of more than 98%, and there is no pressure or flame during operation, eliminating safety hazards. The temperature compensation control technology is used to effectively reduce the heat load loss and save energy. The remote monitoring and unmanned operation saves labor cost expenditure, achieving the purpose of reducing operating costs and improving the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 for Figure 1 Side view of

[0023] Figure 3 for Figure 1 Cross-section of the middle AA surface;

[0024] Figure 4 for Figure 1 Sectional view of the middle BB surface;

[0025] Figure 5 It is a schematic diagram of the structure of the thermal reaction bed of the present invention;

[0026] In the figure: 1 is the mounting base, 2 is the reaction bed waste heat chamber, 3 is the fresh air exchange chamber, 4 is the initial air heat exchange chamber, 5 is the evaporation heat exchange chamber, 6 is the exchanger heat pipe, 7 is the hot air outlet, 8 is the hot air inlet, 9 is the hot reaction bed, 10 is the upper cover, 11 is the mixed gas distributor, 12 is the upper plate, 13 is the reaction tube, 14 is the middle dividing plate, 15 is the lower plate, 16 is the flap, 17 is the fresh air box, 18 is the fresh air filter membrane, 19 is the fresh air main pipeline, 20 is the hot reaction bed branch pipeline, 21 is the fresh air proportion control valve, 22 is the methanol atomizing nozzle valve group, 23 is the methanol feeding system valve group, 24 is the methanol storage tank, 25 is the cold air inlet, 26 is the initial air heat exchange outlet, 27 is the heat exchange air delivery pipeline, 28 is the tail gas waste heat discharge port, and 29 is the upper cover. DETAILED DESCRIPTION

[0027] like Figures 1 to 5 As shown, the present invention is based on the methanol nano-catalytic oxidation mine wellhead antifreeze air heating device, including a reaction device and a heating device arranged on a mounting base 1, the reaction device and the heating device are arranged side by side, the reaction device is a multi-cavity box composed of multiple steel plates, the reaction bed waste heat chamber 2, the fresh air exchange chamber 3, and the initial air heat exchange chamber 4 are arranged in sequence from bottom to top inside the reaction device, the evaporation heat exchange chamber 5 is arranged inside the heating device, and multiple exchanger heat pipes 6 are vertically arranged in the evaporation heat exchange chamber 5, a hot air outlet 7 is arranged at one end of the heating device, and a hot air inlet 8 is arranged at the other end of the heating device;

[0028] A plurality of hot reaction beds 9 are fixedly arranged in the initial air heat exchange chamber 4 of the reaction device, an upper cover 10 is arranged on the top of the hot reaction bed 9, a mixed gas distributor 11 is arranged on the outer side of the upper cover 10, the bottom of the upper cover 10 is connected and fixed to an upper plate 12 by bolts, the upper plate 12 is specifically a sealing welding plate with a plurality of through holes, a reaction tube 13 is arranged in each through hole of the upper plate 12, the reaction tube 13 passes through a middle dividing plate 14 and is connected to a through hole arranged on a lower plate 15, and a flap 16 is also arranged on the surface of each reaction tube 13;

[0029] The reaction tubes 13 of each thermal reaction bed 9 from the upper plate 12 to the middle plate 14 are encapsulated in the initial air heat exchange chamber 4;

[0030] The reaction tubes 13 in each of the heat reaction beds 9 from the middle dividing plate 14 to the lower plate 15 are encapsulated in the fresh air exchange chamber 3;

[0031] The bottom of the lower plate 15 is connected to the reaction bed waste heat chamber 2;

[0032] An air inlet is provided at one end of the fresh air exchange chamber 3, a fresh air box 17 is provided on the outside of the air inlet, a fresh air filter membrane 18 is provided on the outside of the fresh air box 17, an air outlet is provided at the other end of the fresh air exchange chamber 3, the air outlet is connected to a fresh air main pipeline 19, a plurality of thermal reaction bed branch pipelines 20 are connected to the fresh air main pipeline 19, a fresh air proportion control valve 21 and a methanol atomizing nozzle valve group 22 are also provided on each thermal reaction bed branch pipeline 20, the methanol atomizing nozzle valve group 22 is connected to a methanol feeding system valve group 23 through a methanol output pipeline, and the methanol feeding system valve group 23 is connected to a methanol storage tank 24 through a methanol input pipeline;

[0033] A cold air inlet 25 is provided at one end of the initial air heat exchange chamber 4, and an initial air heat exchange outlet 26 is provided at the other end of the initial air heat exchange chamber 4, and the initial air heat exchange outlet 26 is connected to the hot air inlet 8 through a heat exchange air delivery pipe 27;

[0034] A window is also provided on one side of the reaction bed waste heat chamber 2, and the reaction bed waste heat chamber 2 is connected with the evaporation heat exchange chamber 5 through the window;

[0035] A fresh air fan is also provided at the air inlet of the fresh air exchange chamber 3 , and a temperature sensor is also provided inside the fresh air main duct 19 .

[0036] An exhaust gas waste heat discharge port 28 is also provided on one side of the bottom of the heating device, and an upper cover plate 29 is also provided on the top of the heating device.

[0037] The signal input ends of the fresh air proportion control valve 21, the methanol atomizing nozzle valve group 22, and the methanol feeding system valve group 23 are all connected to the air heating controller through wires;

[0038] The control end of the fresh air fan is connected to the air heating controller through a wire;

[0039] The signal output end of the temperature sensor is connected to the air heating controller through a wire.

[0040] A packaging box is also arranged around the reaction device and the heating device.

[0041] The present invention provides a heating device with low operation and maintenance cost, safe use, energy saving and environmental protection, stable fuel supply, and zero emission of harmful gases. The present invention is based on a methanol catalytic oxidation combustion control method and applies it to a redesigned air heating device.

[0042] The present invention provides a dedicated nano-catalytic oxidation reaction bed in the air heating device for catalytic oxidation combustion reaction of methanol, adopts a top-inlet and bottom-exhaust bottom waste heat heating reaction device as a unit module, realizes process control of temperature compensation according to the influence of mine ventilation volume and climate temperature changes on heat load demand, and automatically adjusts by arranging a fresh air control valve and a methanol atomization control valve on the input pipeline of the reaction bed, thereby controlling the thermal power output of a single reaction bed to meet the corresponding heat load demand and achieve the purpose of antifreeze.

[0043] The nano-catalytic oxidation reaction bed provided by the present invention is composed of an upper plate, a middle dividing plate, a lower plate, catalyst tubes, a central positioning radiation cavity ceramic catalyst carrier, a stainless steel central positioning rod, a locking ring, a sealing method, a ceramic sealing pad, a diverter, a built-in air distribution plate, a head, a mixed gas conduit, etc.

[0044] After the air heating device of the present invention is started and operated, the fresh air filtered by the fresh air box is sucked into the fresh air exchange chamber by the fresh air fan, and the fresh air is input into the fresh air main pipeline after the initial heat exchange with the heat reaction bed, and is connected from the top of the heat reaction bed through the control valves of each branch. The input atomized methanol and the fresh air react in the catalyst tubes to generate a large amount of heat, and are dissipated into the initial air heat exchange chamber through the flaps, and are heat exchanged with the cold air in the initial air heat exchange chamber. After that, they are transported to the evaporation heat exchange chamber through the initial air heat exchange outlet, and then are heat exchanged with the heat pipe of the exchanger and discharged from the hot air outlet to the mine wellhead for antifreeze. In order to improve the heat utilization efficiency, the methanol mixed gas discharged through the lower plate of the heat reaction bed enters the evaporation heat exchange chamber through the residual heat chamber of the reaction bed, and can simultaneously perform heat exchange on the heat pipe of the exchanger.

[0045] When the fresh air enters the preheating reaction bed, the temperature sensor collects the temperature data in the fresh air main duct. After the air heating device controller analyzes and judges the temperature data, it outputs the corresponding instruction to start the preheating reaction bed, controls the action of the preheating reaction bed fresh air proportional valve and the methanol injection atomization solenoid valve, and starts the preheating reaction bed.

[0046] After the reactor bed is started, it can output 100,000 kcal (116KW) of heat to preheat the reactor bed unit start-up chamber. According to the temperature data collected in real time by each reactor bed module, the controller calculates the output heat load parameters based on the collected external temperature data, compensates the information of the controller, and feeds back the corresponding number of working modules and fresh air fan control instructions. During the heating period, the controller controls and adjusts the input or exit of each reactor bed module of this device according to the set parameters and the external dynamic climate temperature compensation mechanism, so as to dynamically adjust the heat load work output of the heating unit according to the changes in ambient temperature, minimize energy consumption, and reduce operating costs. During the control process, variable frequency control technology is used for fresh air control, and electric (or pneumatic) actuators are used for each reactor bed module to achieve opening and closing control.

[0047] The heating device provided by the present invention is used to heat cold air, and is divided into two stages of heat exchange, so that the outlet hot air temperature after exchange reaches the designed outlet temperature;

[0048] Initial heat exchange: The initial heat exchange is carried out by the reaction bed unit. In order to improve the heat exchange efficiency of the reaction tubes, the surface of the reaction tubes needs to be welded with full-process exchange fins, and the exchange area is designed to meet the initial air heat exchange requirements;

[0049] Secondary heat exchange process: The outlet temperature at the bottom of the reaction bed is controlled below 400 degrees Celsius. Under the action of the positive pressure of fresh air, it passes through the lower channel of the hot air device and enters the secondary heat exchanger, namely the heat pipe heat exchanger. Through the heat exchange evaporator at the bottom of the heat pipe heat exchanger, the high-temperature heat is quickly transferred to the exchange chamber for secondary exchange heating of the cold air.

[0050] The heat pipe of the exchanger used is small in size, high in exchange efficiency, isolated between exchange media, optimized in system design, and low in long-term operating cost. The control of the cold air intake volume is completed by the controller synchronously with the control of the reaction bed unit, and the frequency conversion control technology is used to control the cold air main fan.

[0051] The device is also equipped with corresponding automatic manual start-stop control devices. After the stop operation is turned on, the device will automatically enter the stop operation maintenance mode, which can keep the catalytic performance of the catalyst in the best state. When the maintenance is completed, the device will automatically close the reaction bed valve body, cut off all fuel supply systems and other power, and put the device into a dormant state.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mine wellhead antifreeze air heating device based on methanol nano-catalytic oxidation, characterized by: The invention comprises a reaction device and a heating device arranged on a mounting base (1), wherein the reaction device and the heating device are arranged side by side, the reaction device is a multi-cavity box body composed of a plurality of steel plates, wherein a reaction bed waste heat cavity (2), a fresh air exchange cavity (3), and an initial air heat exchange cavity (4) are arranged in sequence from bottom to top inside the reaction device, an evaporation heat exchange cavity (5) is arranged inside the heating device, and a plurality of exchanger heat pipes (6) are vertically arranged in the evaporation heat exchange cavity (5), a hot air outlet (7) is arranged at one end of the heating device, and a hot air inlet (8) is arranged at the other end of the heating device; A plurality of hot reaction beds (9) are fixedly arranged in the initial air heat exchange chamber (4) of the reaction device, an upper cover (10) is arranged on the top of the hot reaction bed (9), a mixed gas distributor (11) is arranged on the outer side of the upper cover (10), the bottom of the upper cover (10) is connected and fixed to an upper plate (12) by bolts, the upper plate (12) is specifically a sealing welding plate with a plurality of through holes, a reaction tube (13) is arranged in each through hole of the upper plate (12), the reaction tube (13) passes through a middle dividing plate (14) and is connected to a through hole arranged on a lower plate (15), and a flap (16) is also arranged on the surface of each reaction tube (13); The reaction tubes (13) in each thermal reaction bed (9) from the upper plate (12) to the middle plate (14) are encapsulated in the initial air heat exchange chamber (4); The reaction tubes (13) in each of the heat reaction beds (9) from the middle dividing plate (14) to the lower plate (15) are encapsulated in the fresh air exchange chamber (3); The bottom of the lower plate (15) is connected to the reaction bed waste heat chamber (2); An air inlet is provided at one end of the fresh air exchange chamber (3), a fresh air box (17) is provided on the outside of the air inlet, a fresh air filter membrane (18) is provided on the outside of the fresh air box (17), an air outlet is provided at the other end of the fresh air exchange chamber (3), the air outlet is connected to a fresh air main pipeline (19), a plurality of thermal reaction bed branch pipelines (20) are connected to the fresh air main pipeline (19), each thermal reaction bed branch pipeline (20) is further provided with a fresh air proportion control valve (21) and a methanol atomizing nozzle valve group (22), the methanol atomizing nozzle valve group (22) is connected to a methanol feeding system valve group (23) via a methanol output pipeline, and the methanol feeding system valve group (23) is connected to a methanol storage tank (24) via a methanol input pipeline; A cold air inlet (25) is provided at one end of the initial air heat exchange chamber (4), and an initial air heat exchange outlet (26) is provided at the other end of the initial air heat exchange chamber (4); the initial air heat exchange outlet (26) is connected to the hot air inlet (8) via a heat exchange air delivery pipe (27); A window is also provided on one side of the reaction bed waste heat chamber (2), and the reaction bed waste heat chamber (2) is connected to the evaporation heat exchange chamber (5) through the window; A fresh air fan is also provided at the air inlet of the fresh air exchange chamber (3), and a temperature sensor is also provided inside the fresh air main duct (19); After the heating device is started, fresh air filtered by the fresh air box (17) is sucked into the fresh air exchange chamber (3) by the fresh air fan. After the fresh air performs an initial heat exchange with the heat reaction bed (9), it is input into the fresh air main pipe (19). After being controlled by the control valves of each branch, it is connected from the top of the heat reaction bed (9). The input atomized methanol and fresh air react in the catalyst tube array to generate heat, which is dissipated into the initial air heat exchange chamber (4) through the flaps (16). After heat exchange with the cold air in the initial air heat exchange chamber (4), it is transported to the evaporation heat exchange chamber (5) through the initial air heat exchange outlet (26), and then after heat exchange with the exchanger heat pipe (6), it is discharged from the hot air outlet (7) to the mine wellhead for antifreeze. In order to improve the heat utilization efficiency, the methanol mixed gas discharged from the lower plate (15) of the thermal reaction bed enters the evaporation heat exchange chamber (5) through the reaction bed residual heat chamber (2), and can simultaneously perform heat exchange on the exchanger heat pipe (6).

2. The antifreeze air heating device for mine wellhead based on methanol nano-catalytic oxidation according to claim 1 is characterized in that: An exhaust gas waste heat discharge port (28) is also provided on one side of the bottom of the heating device, and an upper cover plate (29) is also provided on the top of the heating device.

3. The antifreeze air heating device for mine wellhead based on methanol nano-catalytic oxidation according to claim 2 is characterized in that: The signal input ends of the fresh air proportion control valve (21), the methanol atomizing nozzle valve group (22), and the methanol feeding system valve group (23) are all connected to the air heating controller via wires; The control end of the fresh air fan is connected to the air heating controller through a wire; The signal output end of the temperature sensor is connected to the air heating controller through a wire.

4. The antifreeze air heating device for mine wellhead based on methanol nano-catalytic oxidation according to claim 3 is characterized in that: A packaging box is also arranged around the reaction device and the heating device.

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