Mining anti-explosion urea metering control system and method

Abstract

The invention relates to a mining anti-explosion urea metering control system and method, and the system comprises a signal collection module which is used for collecting the diesel engine rotating speed, the tail gas temperature and the urea solution temperature of an anti-explosion diesel engine; the control module is used for calculating the urea solution supply flow according to the rotating speed of the diesel engine, the tail gas temperature and the urea solution temperature; a metering control signal is generated according to the urea solution supply flow; the anti-explosion urea metering pump is used for pumping the urea solution out of a urea tank under the control of the metering control signal so as to convey the urea solution to a nozzle through a conveying pipeline; the influence of the tail gas temperature and the urea solution temperature on the tail gas treatment process of the urea solution is considered, so that the best tail gas treatment effect is achieved, and the tail gas treatment effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof diesel engines for mining, and in particular to a metering control system and method for explosion-proof urea for mining. Background Art

[0002] Explosion-proof diesel engines are the main power of trackless auxiliary transport vehicles and are widely used in large and medium-sized coal mines in China. As the emission regulations for non-road mobile machinery and equipment become increasingly stringent, in order to reduce harmful substances such as nitrogen oxides in engine exhaust, the post-treatment technology commonly used in the industry is selective catalytic reduction (SCR) technology, which injects urea solution into the exhaust gas. After the urea solution is hydrolyzed, ammonia is produced, which reacts chemically with nitrogen oxides to generate nitrogen and water, thereby reducing the concentration of harmful substances.

[0003] In the prior art, when the urea solution is introduced into the exhaust gas through the explosion-proof urea nozzle for mining, the influence of the temperature of the urea solution on the exhaust gas treatment effect is not considered, resulting in poor exhaust gas treatment effect. Summary of the invention

[0004] In order to solve the technical problems in the prior art that the influence of urea solution temperature on the exhaust gas treatment effect is not considered, resulting in poor exhaust gas treatment effect, etc., the present invention provides a mining explosion-proof urea metering control system and method.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A mine explosion-proof urea metering control system, comprising:

[0007] A signal acquisition module is used to collect the diesel engine speed, exhaust gas temperature and urea solution temperature of the explosion-proof diesel engine;

[0008] A control module, configured to calculate a urea solution supply flow rate according to the diesel engine speed, the exhaust gas temperature and the urea solution temperature; and to generate a metering control signal according to the urea solution supply flow rate;

[0009] The explosion-proof urea metering pump is used to pump the urea solution out of the urea tank under the control of the metering control signal, so as to transport the urea solution to the nozzle through the delivery pipeline.

[0010] The beneficial effects of the present invention are as follows: when the explosion-proof urea metering pump is used to pump out the urea solution, the diesel engine speed, the exhaust gas temperature and the urea solution temperature are fully considered, the flow rate of the urea solution required for the exhaust gas treatment is calculated by considering the diesel engine speed, the exhaust gas temperature and the urea solution temperature, and then a control signal is generated according to the calculated flow rate, and the explosion-proof urea metering pump is controlled by the control signal; compared with the traditional technology, in addition to considering the diesel engine speed, the present invention also considers the influence of the exhaust gas temperature and the urea solution temperature on the exhaust gas treatment process of the urea solution, so that the exhaust gas treatment can achieve the best treatment effect and improve the exhaust gas treatment effect.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the control module is specifically used to calculate a basic flow value according to the diesel engine speed, calculate an exhaust gas temperature compensated flow value according to the exhaust gas temperature, calculate a urea solution temperature compensated flow value according to the urea solution temperature, and calculate the urea solution supply flow according to the basic flow value, the exhaust gas temperature compensated flow value and the urea solution temperature compensated flow value.

[0013] Furthermore, the control module is also specifically used to construct a basic urea flow mapping table, an exhaust gas temperature compensation flow mapping table and a urea solution temperature compensation flow mapping table; a basic flow value is obtained by querying from the basic urea flow mapping table according to the diesel engine speed, an exhaust gas temperature compensation flow value is obtained by querying from the exhaust gas temperature compensation flow mapping table according to the exhaust gas temperature, and a urea solution temperature compensation flow value is obtained by querying from the urea solution temperature compensation flow mapping table according to the urea solution temperature.

[0014] Furthermore, the control module is also specifically used to calculate the sum of the basic flow value, the exhaust gas temperature compensated flow value and the urea solution temperature compensated flow value to obtain the urea solution supply flow rate.

[0015] Further, when the exhaust gas temperature is less than the preset threshold value of exhaust gas temperature compensation, the reference value of the exhaust gas temperature compensated flow value in the exhaust gas temperature compensated flow mapping table is greater than zero; when the exhaust gas temperature is greater than or equal to the preset threshold value of exhaust gas temperature compensation, the reference value of the exhaust gas temperature compensated flow value in the exhaust gas temperature compensated flow mapping table is zero; when the urea solution temperature is less than the preset threshold value of urea solution temperature, the reference value of the urea solution temperature compensated flow value in the urea solution temperature compensated flow mapping table is greater than zero; when the urea solution temperature is greater than or equal to the preset threshold value of urea solution temperature, the reference value of the urea solution temperature compensated flow value in the urea solution temperature compensated flow mapping table is zero.

[0016] Furthermore, the metering control signal is a pulse control signal, and the explosion-proof urea metering pump is an electromagnetic metering pump.

[0017] Further, the electromagnetic metering pump includes a shell, a pump body, an armature, an electromagnetic coil, a piston rod, a first one-way valve and a second one-way valve; a mounting hole is provided on the shell, the mounting hole is a through hole, one end of the pump body is interlaced and matched with the mounting hole, and a first fluid hole that penetrates the pump body is provided on the end surface of the other end of the pump body; one end of the piston rod is inserted into the mounting hole and interlaced and matched with the first fluid hole, and a second fluid hole that penetrates the piston rod is provided on the end surface of the other end of the piston rod, a first one-way valve assembly is fixedly arranged in the first fluid hole, the first one-way valve assembly is arranged close to one end of the piston rod, and a second one-way valve assembly is fixedly arranged in the second fluid hole; the armature and the electromagnetic coil are sequentially arranged outside the pump body, the armature is located in the mounting hole, the electromagnetic coil is embedded in the shell, and the electromagnetic coil is electrically connected to the control module through an explosion-proof cable.

[0018] Furthermore, the electromagnetic metering pump also includes a temperature fuse, one end of the temperature fuse is connected to the electromagnetic coil, and the other end of the temperature fuse is connected to the explosion-proof cable.

[0019] In order to solve the above technical problems, the present invention also provides a method for controlling the metering of explosion-proof urea for mining, and its specific technical contents are as follows:

[0020] A method for controlling the metering of explosion-proof urea for mining comprises the following steps:

[0021] The signal acquisition module is used to collect the diesel engine speed, exhaust gas temperature and urea solution temperature of the explosion-proof diesel engine;

[0022] Utilizing a control module to calculate a urea solution supply flow rate according to the diesel engine speed, the exhaust gas temperature, and the urea solution temperature; and generating a metering control signal according to the urea solution supply flow rate;

[0023] The explosion-proof urea metering pump is used to pump the urea solution out of the urea tank under the control of the metering control signal, so as to transport the urea solution to the nozzle through the delivery pipeline.

[0024] In order to solve the above technical problems, the present invention also provides an exhaust gas treatment device for explosion-proof diesel for mining, and its specific technical contents are as follows:

[0025] An exhaust gas treatment device for explosion-proof diesel used in mining comprises the above-mentioned explosion-proof urea metering control system used in mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1This is a structural block diagram of a mining explosion-proof urea metering control system in an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the electromagnetic metering pump in an embodiment of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1- pump body, 2- shell, 3- armature, 4- electromagnetic coil, 5- potting glue, 6- piston rod, 7- spring seat, 8- liquid outlet spring, 9- second sealing ball, 10- liquid inlet spring, 11- first sealing ball, 12- guide seat, 13- cable clamping mechanism, 14- explosion-proof cable, 15- temperature fuse. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figure 1 As shown, this embodiment provides a mining explosion-proof urea metering control system, including:

[0032] A signal acquisition module is used to collect the diesel engine speed, exhaust gas temperature and urea solution temperature of the explosion-proof diesel engine;

[0033] A control module is used to calculate the urea solution supply flow rate according to the diesel engine speed, the exhaust gas temperature and the urea solution temperature; and to generate a metering control signal according to the urea solution supply flow rate; wherein the control module is a DCU electronic control unit.

[0034] The explosion-proof urea metering pump is used to pump the urea solution out of the urea tank under the control of the metering control signal, so as to transport the urea solution to the nozzle through the delivery pipeline. The metering control signal is a pulse control signal, and the explosion-proof urea metering pump is an electromagnetic metering pump.

[0035] In some embodiments, the control module is specifically used to calculate a basic flow value according to the diesel engine speed, calculate an exhaust gas temperature compensated flow value according to the exhaust gas temperature, calculate a urea solution temperature compensated flow value according to the urea solution temperature, and calculate the urea solution supply flow according to the basic flow value, the exhaust gas temperature compensated flow value and the urea solution temperature compensated flow value.

[0036] In some embodiments, the control module is also specifically used to construct a basic urea flow mapping table, an exhaust gas temperature compensation flow mapping table, and a urea solution temperature compensation flow mapping table; the basic flow value is obtained by querying from the basic urea flow mapping table according to the diesel engine speed, the exhaust gas temperature compensation flow value is obtained by querying from the exhaust gas temperature compensation flow mapping table according to the exhaust gas temperature, and the urea solution temperature compensation flow value is obtained by querying from the urea solution temperature compensation flow mapping table according to the urea solution temperature. Different diesel engine speeds in the basic urea flow mapping table correspond to different basic flow values; each exhaust gas temperature in the exhaust gas temperature compensation flow mapping table corresponds to an exhaust gas temperature compensation flow value; each urea solution temperature in the urea solution temperature compensation flow mapping table corresponds to a urea solution temperature compensation flow value.

[0037] The control module is also specifically used to calculate the sum of the basic flow value, the exhaust gas temperature compensation flow value and the urea solution temperature compensation flow value to obtain the urea solution supply flow. When the exhaust gas temperature is less than the preset exhaust gas temperature compensation threshold, the reference value of the exhaust gas temperature compensation flow value in the exhaust gas temperature compensation flow mapping table is greater than zero; when the exhaust gas temperature is greater than or equal to the preset exhaust gas temperature compensation threshold, the reference value of the exhaust gas temperature compensation flow value in the exhaust gas temperature compensation flow mapping table is zero; when the urea solution temperature is less than the preset urea solution temperature threshold, the reference value of the urea solution temperature compensation flow value in the urea solution temperature compensation flow mapping table is greater than zero; when the urea solution temperature is greater than or equal to the preset urea solution temperature threshold, the reference value of the urea solution temperature compensation flow value in the urea solution temperature compensation flow mapping table is zero. Since the chemical reaction of catalytic reduction is affected by the reaction temperature when the diesel engine exhaust is treated by the selective catalytic reduction (SCR) technology, the present invention fully considers the temperature of the urea solution and the exhaust temperature to place the catalytic reduction reaction in an optimal temperature environment; at the same time, it can also avoid affecting the catalytic reduction reaction effect at different external temperatures, thereby improving the exhaust treatment effect.

[0038] like Figure 2As shown, the electromagnetic metering pump includes a shell 2, a pump body 1, an armature 3, an electromagnetic coil 4, a piston rod 6, a first one-way valve and a second one-way valve; a mounting hole is provided on the shell 2, and the mounting hole is a through hole. One end of the pump body 1 is interlaced and matched with the mounting hole, and a first fluid hole penetrating the pump body 1 is provided on the end surface of the other end of the pump body 1; one end of the piston rod 6 is inserted into the mounting hole and interlaced and matched with the first fluid hole, and a second fluid hole penetrating the piston rod 6 is provided on the end surface of the other end of the piston rod 6, a first one-way valve assembly is fixedly arranged in the first fluid hole, the first one-way valve assembly is arranged close to one end of the piston rod 6, and a second one-way valve assembly is fixedly arranged in the second fluid hole; the armature 3 and the electromagnetic coil 4 are sequentially arranged outside the pump body 1, the armature 3 is located in the mounting hole, the electromagnetic coil 4 is embedded in the shell 2, and the electromagnetic coil 4 is electrically connected to the control module through an explosion-proof cable 14.

[0039] Specifically, the pump body 1 is connected with the guide seat 12 at the place where it protrudes from the outer shell 2, that is, the guide seat 12 is fixed at the orifice of the mounting hole, and a pump body through hole is provided on the guide seat 12, and the other end of the pump body 1 is interlaced and matched with the pump body through hole; the orifice of the first fluid hole at the other end of the pump body 1 is the liquid inlet of the electromagnetic metering pump; the orifice of the second fluid hole located at the other end of the piston rod 6 is the liquid outlet of the electromagnetic metering pump; the first one-way valve assembly includes an inlet spring 10 and a first sealing ball 11, and the second one-way valve assembly includes a liquid outlet spring 8 and a second sealing ball 9; the first fluid hole and the second fluid hole are both stepped holes, and the first sealing ball 11 is used to block the first fluid hole and form the first one-way valve assembly with the inlet spring 10; the second sealing ball 9 is used to block the second fluid hole and form the two one-way valve assemblies with the liquid outlet spring 8.

[0040] The armature 3 is also provided with a vent hole, which penetrates the armature 3, and both ends of the vent hole are connected to the mounting hole; the electromagnetic coil 4 is filled with potting glue 5, and the electromagnetic coil 4 is embedded in the housing 2 through the electromagnetic coil 4. That is, a coil accommodating groove is provided on the housing 2, and the coil accommodating groove is an annular groove connected end to end, and the annular groove takes the mounting hole as the rotation center; the electromagnetic coil 4 is wound in the annular groove, and then the annular groove is sealed with an annular sealing cover or multiple arc-shaped sealing covers to form a closed space, and then the annular groove is sealed with a hole in the arc-shaped sealing cover, and the potting glue 5 is injected into the annular groove through the opening on the annular groove cover of the arc-shaped sealing cover.

[0041] The electromagnetic metering pump further comprises a temperature fuse 15, one end of which is connected to the electromagnetic coil 4, and the other end of which is connected to the explosion-proof cable 14. The explosion-proof cable 14 is fixed to the housing 2 via a cable clamping mechanism 13.

[0042] The shell 2 and the cable clamping mechanism 14 form an explosion-proof shell that meets the explosion-proof requirements for coal mines; the electromagnetic coil 4 is a copper coil that is fixed by pouring and sealing with a potting glue 5, and the thickness of the potting glue meets the explosion-proof safety standards for coal mine electrical parts; the explosion-proof cable 14 adopts the explosion-proof cable of the coal mine safety standard, and the cable clamping mechanism 13 meets the coal mine safety drawing requirements for the cable; the temperature fuse 15 ensures that the temperature of the explosion-proof urea metering pump does not exceed the coal mine safety standards for parts when it is working. The spring seat 7 is connected to the piston rod 6 by interference fit, the pump body 1 and the armature 3 are connected to each other by interference fit, the shell 2 is connected to the guide seat 12, the piston rod 6 is connected to the shell 2, the inner circle of the guide seat 12 forms a clearance fit with the outer circle of the step on the pump body 1, the outer circle of the armature 3 forms a clearance fit with the mounting hole in the shell 2, the first fluid hole on the pump body 1 is clearance fit with the outer circle of the step on the piston rod 6, and the armature 1 has the vent hole along the axis direction in the circumference. When the power is off or there is no high pulse level, the tension of the inlet spring 10 presses the pump body 1 against the lower end surface of the guide seat 12 through the first sealing ball 11, and the second sealing ball 9 is pressed against the conical surface of the piston rod 6 through the tension of the outlet spring 8. The explosion-proof urea metering pump is installed between the pipelines of the urea tank and the urea nozzle, and the explosion-proof cable 14 is connected to the pin of the DCU electronic control unit. When the explosion-proof diesel engine is working, the urea metering pump provides the required amount of pressurized urea solution to the urea nozzle. The nitrogen oxide sensor installed on the explosion-proof exhaust after-treatment device collects the nitrogen oxide content in the exhaust gas in real time. When it is detected that the nitrogen oxide content in the exhaust gas exceeds the limit set by the program, the DCU electronic control unit calculates and compares through the internal program, and then sends a high-level pulse signal to the electromagnetic coil 4 through the explosion-proof cable 14. The electromagnetic coil 4 generates an electromagnetic force on the armature 3. When this electromagnetic force is greater than the combined force of the urea solution sealed by the return spring 10 and the pump body 1, the second sealing ball 9, the first sealing ball 11, the piston rod 6, etc. on the pump body 1, the armature Iron 3 drives the pump body 1 and the first sealing ball 11 to move downward. During the movement, the urea solution sealed by the pump body 1, the second sealing ball 9, the first sealing ball 11, the piston rod 6, etc. will push the second sealing ball 9 away from the conical surface of the piston rod 6 to form a flow surface. After the pressurized urea solution passes through this flow surface, it flows to the delivery pipeline through the lower end of the piston rod, forming a urea spray at the urea nozzle, thereby mixing with the engine exhaust. The urea solution is hydrolyzed under the high temperature of the exhaust gas to produce ammonia, which reacts chemically with nitrogen oxides to generate nitrogen and water and discharge into the atmosphere. When the lower end face of the pump body 1 contacts the upper step end face of the piston rod 6, an injection metering process is formed. Single injection amount Q: The fixed displacement stroke H of the moving part pump body 1 reaches the compression fixed urea solution to achieve fixed injection in each working cycle. The total injection amount is the product of the number of working times n and the single injection amount Q (frequency modulation control).

[0043] When the explosion-proof urea metering pump is used to pump out the urea solution, the embodiment of the present invention fully considers the diesel engine speed, the exhaust gas temperature and the urea solution temperature, calculates the flow rate of the urea solution required for the exhaust gas treatment by considering the diesel engine speed, the exhaust gas temperature and the urea solution temperature, and then generates a control signal according to the calculated flow rate, and uses the control signal to control the explosion-proof urea metering pump; compared with the traditional technology, in addition to considering the diesel engine speed, the present invention also considers the influence of the exhaust gas temperature and the urea solution temperature on the exhaust gas treatment process of the urea solution, so that the exhaust gas treatment can achieve the best treatment effect and improve the exhaust gas treatment effect.

[0044] In some other embodiments, a method for controlling the metering of explosion-proof urea for mining is provided, comprising the following steps:

[0045] Step 1: Using the signal acquisition module to collect the diesel engine speed, exhaust gas temperature and urea solution temperature of the explosion-proof diesel engine;

[0046] Step 2: using a control module to calculate a urea solution supply flow rate according to the diesel engine speed, the exhaust gas temperature and the urea solution temperature; and generating a metering control signal according to the urea solution supply flow rate;

[0047] Step 3: using an explosion-proof urea metering pump to pump the urea solution out of the urea tank under the control of the metering control signal, so as to transport the urea solution to the nozzle through a delivery pipeline.

[0048] In some other embodiments, an exhaust gas treatment device for explosion-proof diesel for mining is also provided, and the exhaust gas treatment device for explosion-proof diesel for mining includes the above-mentioned explosion-proof urea metering control system for mining. The exhaust gas treatment device for explosion-proof diesel can use selective catalytic reduction (SCR) technology or a selective catalytic reduction (SCR) device to perform catalytic reduction treatment on diesel engine exhaust.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mine explosion-proof urea metering control system, characterized in that: include: A signal acquisition module is used to collect the diesel engine speed, exhaust gas temperature and urea solution temperature of the explosion-proof diesel engine; A control module, configured to calculate a urea solution supply flow rate according to the diesel engine speed, the exhaust gas temperature and the urea solution temperature; and to generate a metering control signal according to the urea solution supply flow rate; The explosion-proof urea metering pump is used to pump the urea solution out of the urea tank under the control of the metering control signal, so as to transport the urea solution to the nozzle through the delivery pipeline.

2. The explosion-proof urea metering control system for mining according to claim 1, characterized in that: The control module is specifically used to calculate a basic flow value according to the diesel engine speed, calculate an exhaust gas temperature compensated flow value according to the exhaust gas temperature, calculate a urea solution temperature compensated flow value according to the urea solution temperature, and calculate the urea solution supply flow according to the basic flow value, the exhaust gas temperature compensated flow value and the urea solution temperature compensated flow value.

3. The explosion-proof urea metering control system for mining according to claim 2, characterized in that: The control module is also specifically used to construct a basic urea flow mapping table, an exhaust gas temperature compensation flow mapping table and a urea solution temperature compensation flow mapping table; according to the diesel engine speed, a basic flow value is queried from the basic urea flow mapping table, according to the exhaust gas temperature, an exhaust gas temperature compensation flow value is queried from the exhaust gas temperature compensation flow mapping table, and according to the urea solution temperature, a urea solution temperature compensation flow value is queried from the urea solution temperature compensation flow mapping table.

4. The explosion-proof urea metering control system for mining according to claim 3 is characterized in that: The control module is further specifically configured to calculate the sum of the basic flow value, the exhaust gas temperature compensated flow value, and the urea solution temperature compensated flow value to obtain the urea solution supply flow rate.

5. The explosion-proof urea metering control system for mining according to claim 4, characterized in that: When the exhaust gas temperature is less than the preset exhaust gas temperature compensation threshold, the reference value of the exhaust gas temperature compensation flow value in the exhaust gas temperature compensation flow mapping table is greater than zero; when the exhaust gas temperature is greater than or equal to the preset exhaust gas temperature compensation threshold, the reference value of the exhaust gas temperature compensation flow value in the exhaust gas temperature compensation flow mapping table is zero; When the urea solution temperature is less than a preset urea solution temperature threshold, the reference value of the urea solution temperature compensation flow value in the urea solution temperature compensation flow mapping table is greater than zero; When the urea solution temperature is greater than or equal to the preset urea solution temperature threshold, the reference value of the urea solution temperature compensated flow value in the urea solution temperature compensated flow mapping table is zero.

6. The explosion-proof urea metering control system for mining according to claim 1, characterized in that: The metering control signal is a pulse control signal, and the explosion-proof urea metering pump is an electromagnetic metering pump.

7. The explosion-proof urea metering control system for mining according to claim 6, characterized in that: The electromagnetic metering pump comprises a housing (2), a pump body (1), an armature (3), an electromagnetic coil (4), a piston rod (6), a first one-way valve and a second one-way valve; the housing (2) is provided with a mounting hole, the mounting hole being a through hole, one end of the pump body (1) is inserted and matched with the mounting hole, and the end surface of the other end of the pump body (1) is provided with a first fluid hole penetrating the pump body (1); one end of the piston rod (6) is inserted into the mounting hole and is inserted and matched with the first fluid hole, and the end surface of the other end of the piston rod (6) is provided with a A second fluid hole is provided which passes through the piston rod (6), a first one-way valve assembly is fixedly arranged in the first fluid hole, the first one-way valve assembly is arranged close to one end of the piston rod (6), and a second one-way valve assembly is fixedly arranged in the second fluid hole; the armature (3) and the electromagnetic coil (4) are arranged in sequence outside the pump body (1), the armature (3) is located in the mounting hole, the electromagnetic coil (4) is embedded in the housing (2), and the electromagnetic coil (4) is electrically connected to the control module via an explosion-proof cable (14).

8. The explosion-proof urea metering control system for mining according to claim 7, characterized in that: The electromagnetic metering pump further comprises a temperature fuse (15), one end of the temperature fuse (15) is connected to the electromagnetic coil (4), and the other end of the temperature fuse (15) is connected to the explosion-proof cable (14).

9. A method for controlling the metering of explosion-proof urea for mining, characterized in that: The steps include: The signal acquisition module is used to collect the diesel engine speed, exhaust gas temperature and urea solution temperature of the explosion-proof diesel engine; Utilizing a control module to calculate a urea solution supply flow rate according to the diesel engine speed, the exhaust gas temperature, and the urea solution temperature; and generating a metering control signal according to the urea solution supply flow rate; The explosion-proof urea metering pump is used to pump the urea solution out of the urea tank under the control of the metering control signal, so as to transport the urea solution to the nozzle through the delivery pipeline.

10. An exhaust gas treatment device for explosion-proof diesel for mining, characterized in that: It comprises the explosion-proof urea metering control system for mining as described in any one of claims 1 to 8.

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