A device and method for treating hydrogen sulfide at a fully-mechanized coal mining face

Abstract

The application discloses a kind of fully mechanized working face hydrogen sulfide treatment device and method, wherein treatment device includes liquid storage tank, for storing sodium bicarbonate solution;Liquid injection pump is connected with liquid storage tank by first connecting pipe;Delivery pipe is connected with liquid pump at one end, and the other end is connected to the first three-way valve that is arranged on working face support spray pipeline;Wherein, the liquid injection pump is used to pump sodium bicarbonate solution in the liquid storage tank into the first three-way valve through the delivery pipe, so that sodium bicarbonate solution is mixed with water in the support spray pipeline, and then sprayed by support spray to the surface of coal body.The scheme of the present application uses the existing support spray system of working face as a spray carrier, without significantly modifying the existing equipment, synchronously sprays sodium bicarbonate solution from the source of hydrogen sulfide, shortens the exposure time of hydrogen sulfide in air, realizes the inhibition of hydrogen sulfide diffusion from the source, and effectively reduces the concentration of hydrogen sulfide gas in working face.

Description

Technical Field

[0001] This application generally relates to the field of coal mine safety production technology. More specifically, this application relates to a device and method for treating hydrogen sulfide in a fully mechanized mining face. Background Technology

[0002] Hydrogen sulfide is a toxic and harmful gas. During the longwall mining process in underground coal mines, the crushing of coal releases large amounts of hydrogen sulfide gas, often exceeding national regulations in concentration, posing a significant threat to human health. Furthermore, hydrogen sulfide is corrosive, causing damage to equipment at the mining face. Therefore, effectively controlling hydrogen sulfide in longwall mining faces has become a pressing technical problem in the field of coal mine safety production.

[0003] Currently, the main methods for controlling hydrogen sulfide in fully mechanized mining faces are spraying sodium bicarbonate powder onto the coal face or increasing the ventilation volume. Specifically, spraying sodium bicarbonate powder utilizes the neutralization reaction between sodium bicarbonate and hydrogen sulfide. However, this method has problems: during the mining process, hydrogen sulfide gas is released instantaneously after the coal face breaks, while the spraying of sodium bicarbonate powder is delayed, and the contact between the powder and the gas is insufficient, making it difficult to achieve a timely and sufficient neutralization reaction. Increasing the ventilation volume reduces the concentration of hydrogen sulfide gas in the airflow through dilution, allowing the gas to be quickly discharged. This method only transfers hydrogen sulfide to the outside of the working face; it does not reduce the generation of hydrogen sulfide at its source or convert it into harmless substances, and therefore cannot reduce the harm of hydrogen sulfide gas to personnel and equipment at the working face.

[0004] In addition, existing hydrogen sulfide treatment technologies also suffer from problems such as incomplete treatment, unsatisfactory results, waste of raw materials due to insufficient utilization of absorbent liquid, and low degree of automation.

[0005] In view of this, there is an urgent need to provide a device and method for treating hydrogen sulfide in fully mechanized mining faces in order to effectively reduce the concentration of hydrogen sulfide gas in the working faces. Summary of the Invention

[0006] In order to solve at least one or more of the technical problems mentioned above, this application proposes a hydrogen sulfide treatment device and method for fully mechanized mining faces in several aspects.

[0007] In a first aspect, this application provides a hydrogen sulfide treatment device for a fully mechanized mining face, comprising: a storage tank for storing sodium bicarbonate solution; an injection pump connected to the storage tank via a first connecting pipe; and a delivery pipe, one end of which is connected to the injection pump and the other end of which is connected to a first three-way valve installed on a spray pipe of the working face support; wherein, the injection pump is used to pump the sodium bicarbonate solution in the storage tank into the first three-way valve via the delivery pipe, so that the sodium bicarbonate solution mixes with water in the spray pipe of the support and is then sprayed out by the support sprayer to the surface of the coal body.

[0008] In some embodiments, the other end of the delivery pipe is further provided with a branch pipe, which is connected to a second tee interface provided on the roadway purification water curtain supply pipeline; the injection pump pumps sodium bicarbonate solution into the purification water curtain supply pipeline, so that the sodium bicarbonate solution mixes with the water in the purification water curtain supply pipeline and is then sprayed out from the purification water curtain inside the working face.

[0009] In some embodiments, the device further includes a third three-way valve and a mixing liquid pipe; the first port of the first three-way valve is connected to the delivery pipe, the second port is connected to the clean water pipe, and the third port is connected to one end of the mixing liquid pipe; the first port of the third three-way valve is connected to the other end of the mixing liquid pipe, the second port is connected to the working face support spray pipe, and the third port is connected to the roadway purification water curtain pipe.

[0010] In some embodiments, the storage tank is equipped with a stirrer for stirring the sodium bicarbonate solution evenly.

[0011] In some embodiments, the storage tank is equipped with a pH display for displaying the pH value of the sodium bicarbonate solution inside the storage tank.

[0012] In some embodiments, the first connecting pipe is provided with a filter for filtering impurities in the sodium bicarbonate solution.

[0013] In some embodiments, a check valve is provided between the delivery pipe and the first three-way valve to prevent water in the water supply pipeline from flowing back into the delivery pipe.

[0014] In a second aspect, this application provides a method for treating hydrogen sulfide in a fully mechanized mining face, using the aforementioned treatment device, comprising the following steps: preparing a sodium bicarbonate solution in a storage tank; pumping the sodium bicarbonate solution from the storage tank into a first three-way valve installed on the support spray pipeline via a delivery pipe using an injection pump; mixing the sodium bicarbonate solution with water in the support spray pipeline to form a mixture; and spraying the mixture from the support spray to the coal surface to neutralize the hydrogen sulfide gas generated during the mining process.

[0015] In some embodiments, the method further includes the following steps: the delivery pipe simultaneously delivers sodium bicarbonate solution to the second tee port on the roadway purification water curtain water supply pipeline through a branch pipe; the sodium bicarbonate solution and the water in the purification water curtain water supply pipeline are mixed at the second tee port; the mixed solution is sprayed out from the purification water curtain inside the working face to perform a secondary neutralization reaction on the hydrogen sulfide gas in the airflow.

[0016] In some embodiments, the device further includes a third three-way valve and a mixing pipe; the third port of the first three-way valve is connected to the first port of the third three-way valve through the mixing pipe, and the second and third ports of the third three-way valve are respectively connected to the support spray pipe and the purified water curtain pipe; after the sodium bicarbonate solution and water are mixed in the first three-way valve, they flow into the third three-way valve through the mixing pipe and are distributed to the support spray pipe and the purified water curtain pipe for spraying.

[0017] Furthermore, through the hydrogen sulfide treatment device for fully mechanized mining faces provided above, this embodiment of the application introduces sodium bicarbonate solution into the support spray pipeline, so that the support spray simultaneously sprays the sodium bicarbonate mixture onto the coal surface while the coal mining machine is cutting the coal body. This allows for the neutralization reaction of hydrogen sulfide gas as soon as it is released from the coal body, shortening the exposure time of hydrogen sulfide in the air. This effectively solves the problems of delayed spraying and insufficient reaction of sodium bicarbonate powder in the prior art, and achieves simultaneous treatment of hydrogen sulfide from its source.

[0018] Furthermore, by utilizing the existing support spray system on the working face as the spraying carrier, there is no need to lay a dedicated spray pipeline. The modification can be achieved simply by adding a first three-way valve to the existing water supply pipeline and connecting the injection pump and the storage tank. This significantly reduces the equipment modification cost while ensuring that the spray covers the entire coal face area.

[0019] By mixing sodium bicarbonate with spray water in solution and then spraying it out, the contact area and reaction efficiency between sodium bicarbonate and hydrogen sulfide gas are increased, effectively improving the treatment effect of hydrogen sulfide. Attached Figure Description

[0020] The above features of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein:

[0021] Figure 1 A schematic diagram of a hydrogen sulfide treatment device for a fully mechanized mining face according to an embodiment of this application is shown; Figure 2 A flowchart of a hydrogen sulfide treatment method for a fully mechanized mining face according to an embodiment of this application is shown.

[0022] In the diagram: 100, fully mechanized mining face; 1, liquid storage tank; 2, liquid injection pump; 3, first connecting pipe; 4, delivery pipe; 5, first three-way valve; 6, agitator; 7, pH display; 8, clean water pipe; 9, transport roadway; 10, return air roadway; 11, support spray; 12, purification water curtain. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] It should be understood that the terms "comprising" and "including" used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terminology used herein is for describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0026] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0027] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0028] like Figure 1 As shown, in some embodiments, this application provides a hydrogen sulfide treatment device for a fully mechanized mining face, comprising: a storage tank 1 for storing sodium bicarbonate solution; an injection pump 2 connected to the storage tank 1 via a first connecting pipe 3; and a delivery pipe 4, one end of which is connected to the injection pump, and the other end of which is connected to a first three-way valve 5 installed on the working face support spray 11 pipeline; wherein, the injection pump 2 is used to pump the sodium bicarbonate solution in the storage tank 1 into the first three-way valve 5 via the delivery pipe 4, so that the sodium bicarbonate solution mixes with the water in the support spray 11 pipeline and is then sprayed out by the support spray 11 onto the coal surface.

[0029] In this application, the hydrogen sulfide treatment device for the fully mechanized mining face includes a storage tank 1, an injection pump 2, and a delivery pipe 4. The storage tank 1 stores sodium bicarbonate solution as the source of the reagent required for the neutralization reaction. The injection pump 2 is connected to the storage tank 1 via a first connecting pipe 3 and is used to pump out the sodium bicarbonate solution from the storage tank 1. One end of the delivery pipe 4 is connected to the injection pump 2, and the other end is connected to a first three-way valve 5 installed on the working face support spray 11 pipeline. The first three-way valve 5 is installed on the support spray 11 pipeline and connects to the delivery pipe 4, the water supply end of the support spray 11 pipeline, and the liquid inlet end of the support spray 11, respectively.

[0030] In use, the injection pump 2 pumps the sodium bicarbonate solution from the storage tank 1, which is then transported to the first three-way valve 5 via the delivery pipe 4. Here, the sodium bicarbonate solution mixes with water in the support spray 11 pipeline to form a sodium bicarbonate mixture, which is then sprayed onto the coal surface by the support spray 11. Because the support spray 11 is located close to the coal face, while the coal mining machine is cutting and breaking the coal, releasing hydrogen sulfide gas, the support spray 11 simultaneously sprays the sodium bicarbonate mixture onto the coal surface and the broken coal, allowing the sodium bicarbonate solution to come into immediate contact with the hydrogen sulfide gas and undergo a neutralization reaction.

[0031] The proposed solution utilizes the existing support spray system 11 on the working face as the spraying carrier. Without requiring significant modifications to the existing equipment, sodium bicarbonate solution is sprayed simultaneously from the source of hydrogen sulfide generation, shortening the exposure time of hydrogen sulfide in the air, thereby suppressing the diffusion of hydrogen sulfide from the source and effectively reducing the concentration of hydrogen sulfide gas on the working face.

[0032] In one specific implementation, the other end of the delivery pipe 4 is also provided with a branch pipe, which is connected to the second tee interface provided on the water supply pipeline of the roadway purification water curtain 12; the injection pump 2 pumps sodium bicarbonate solution into the water supply pipeline of the purification water curtain 12, so that the sodium bicarbonate solution mixes with the water in the water supply pipeline of the purification water curtain 12 and is sprayed out from the purification water curtain 12 in the working face.

[0033] In this application, a branch pipe is also provided at the other end of the delivery pipe 4. The branch pipe is connected to a second tee connector provided on the water supply pipeline of the roadway purification water curtain 12. The second tee connector is provided on the water supply pipeline of the purification water curtain 12, and its three ports are respectively connected to the branch pipe, the water supply end of the water supply pipeline of the purification water curtain 12, and the liquid inlet end of the purification water curtain 12. Thus, the sodium bicarbonate solution is introduced into the water supply pipeline of the purification water curtain 12 through the branch pipe and the second tee connector.

[0034] In use, injection pump 2 pumps the sodium bicarbonate solution from storage tank 1, which is then transported through delivery pipe 4 to branch pipe, and then through branch pipe to the second three-way connector. At the second three-way connector, the sodium bicarbonate solution mixes uniformly with water in the water supply line of the purification water curtain 12, forming a sodium bicarbonate mixture of a certain concentration. The mixed sodium bicarbonate solution flows along the water supply line of the purification water curtain 12 and is finally sprayed out by the purification water curtain 12 installed in the tunnel. The spray from the purification water curtain 12 covers the tunnel cross-section, ensuring that hydrogen sulfide gas carried in the tunnel airflow comes into full contact with the sodium bicarbonate mixture and undergoes a neutralization reaction when passing through the purification water curtain 12 area.

[0035] Those skilled in the art will understand that the transport roadway 9 and the return air roadway 10 are two parallel roadways on either side of the fully mechanized mining face 100 in a coal mine. The transport roadway 9 is equipped with a belt conveyor, primarily responsible for transporting coal mined from the face outwards, while fresh air enters the face from the transport roadway 9. The return air roadway 10 is responsible for discharging polluted air (containing hydrogen sulfide, dust, etc.) generated at the face. Hydrogen sulfide gas released during coal mining is dispersed outwards along the return air roadway 10 with the airflow from the face. Therefore, this application includes a purification water curtain 12 in both the return air roadway 10 and the transport roadway 9 to perform secondary neutralization and treatment of the hydrogen sulfide gas escaping with the airflow.

[0036] Specifically, this solution introduces sodium bicarbonate solution into the existing water supply lines of the purification water curtain 12 in the return air roadway 10 and the transport roadway 9 via branch pipes, transforming the purification water curtain 12 from a water spray to a sodium bicarbonate solution spray. This sodium bicarbonate solution spray forms a second neutralization defense line along the path of hydrogen sulfide gas as it diffuses from the working face with the airflow and coal flow into the transport roadway. It further intercepts and neutralizes the hydrogen sulfide gas as it diffuses downstream with the airflow, effectively reducing the harm of hydrogen sulfide gas to workers in the transport roadway 9 and minimizing its corrosion of electrical equipment, metal supports, conveyor belts, and other facilities within the roadway.

[0037] Meanwhile, at transfer points (such as the junction of the transfer machine and the belt conveyor), the drop in coal flow generates dust and gas emissions, and this area often has a high local concentration of hydrogen sulfide gas. The sodium bicarbonate solution sprayed by the purification water curtain 12 can cover the transfer point area, quickly neutralizing the hydrogen sulfide gas released instantaneously during the transfer process and eliminating the risk of local accumulation.

[0038] The proposed solution involves installing a branch pipe at the end of the delivery pipe 4, using the injection pump 2 to simultaneously supply sodium bicarbonate solution to the second three-way interface, and then introducing it into the water supply pipeline of the purified water curtain 12. After mixing with clean water, the solution is sprayed out by the purified water curtain 12. This achieves simultaneous supply of the chemical solution to both the support spray 11 and the purified water curtain 12 spray terminals using a single injection pump 2 and storage tank 1, eliminating the need for additional injection equipment. This provides continuous coverage from source treatment at the working face to secondary treatment in the roadway, forming a multi-stage hydrogen sulfide treatment system. This effectively reduces the diffusion distance and concentration of hydrogen sulfide gas along the airflow direction, improving the overall hydrogen sulfide treatment effect and operational safety of the fully mechanized mining face 100.

[0039] In one specific implementation, the device further includes a third three-way valve and a mixing liquid pipe; the first port of the first three-way valve is connected to the delivery pipe 4, the second port is connected to the clean water pipe 8, and the third port is connected to one end of the mixing liquid pipe; the first port of the third three-way valve is connected to the other end of the mixing liquid pipe, the second port is connected to the working face support spray 11 pipe, and the third port is connected to the roadway purification water curtain 12 pipe.

[0040] In this application, the device further includes a third three-way valve and a mixing liquid pipe. The first three-way valve has three ports: the first port connects to the delivery pipe 4 to receive sodium bicarbonate solution from the injection pump 2; the second port connects to the clean water pipe 8 to introduce external clean water; and the third port connects to one end of the mixing liquid pipe. The third three-way valve also has three ports: the first port connects to the other end of the mixing liquid pipe to receive the mixed liquid; the second port connects to the working face support spray pipe 11; and the third port connects to the roadway purification water curtain pipe 12. The first and third three-way valves are connected in series via the mixing liquid pipe, forming a complete flow path from mixing to distribution.

[0041] The first three-way valve is located near the storage tank 1 and the clean water source, serving as a mixing station. During operation, the injection pump 2 pumps the sodium bicarbonate solution from the storage tank 1 through the delivery pipe 4 to the first port of the first three-way valve. Simultaneously, clean water from the clean water pipe 8 flows into the second port of the first three-way valve. The sodium bicarbonate solution and clean water enter the first three-way valve from different ports, converging in the valve chamber. The turbulence generated by the fluid flow ensures thorough mixing, forming a sodium bicarbonate mixture. The mixture flows out through the third port of the first three-way valve and enters the mixing pipe. The mixing pipe is an independently installed delivery pipe 4, used to transport the mixture from the first three-way valve to the third three-way valve. Its length is determined by the relative position of the working face support spray pipe 11 and the roadway purification water curtain pipe 12, and can be constructed by connecting multiple pipe sections in series. The third three-way valve is located near the support spray pipe 11 and the purification water curtain 12, serving as a distribution station. After the mixed liquid flows into the first port of the third three-way valve through the mixed liquid pipe, it is evenly distributed into two paths inside the third three-way valve: one path flows into the working face support spray 11 pipe through the second port of the third three-way valve, and is sprayed onto the coal surface by the support spray 11; the other path flows into the roadway purification water curtain 12 pipe through the third port of the third three-way valve, and is sprayed into the roadway airflow by the purification water curtain 12 inside the working face. Thus, the sodium bicarbonate solution and water are uniformly mixed at the first three-way valve, and then distributed to the two spray terminals, support spray 11 and purification water curtain 12, through the third three-way valve.

[0042] Compared with the scheme of mixing independently at each spray terminal, this scheme only requires setting a single mixing point at the first three-way valve. The operator only needs to adjust the mixing ratio of sodium bicarbonate solution and water at the mixing point to ensure that the concentration of the mixed liquid sprayed by the support spray 11 and the purified water curtain 12 is consistent. There is no need to adjust at multiple mixing points, which simplifies the concentration control process and helps to ensure the uniformity and stability of the mixed liquid concentration at each spray terminal.

[0043] The first and third three-way valves in this application can be manually adjustable three-way valves or electrically or pneumatically controlled automatic adjustable three-way valves. When using a manually adjustable three-way valve, the operator can pre-set the valve opening based on the hydrogen sulfide concentration detection results at the working face to achieve coarse adjustment of the mixing ratio. When using an electrically or pneumatically controlled automatic adjustable three-way valve, it can be linked with a hydrogen sulfide concentration sensor to automatically adjust the mixing ratio based on the real-time detected hydrogen sulfide concentration, achieving automated control of the treatment process. However, the above description of the specific valve types and their control methods is merely illustrative and does not constitute a limitation on the scope of protection of this application. Those skilled in the art can flexibly select appropriate valve types and control methods according to actual working conditions.

[0044] In one specific implementation, the storage tank 1 is equipped with a stirrer 6 for stirring the sodium bicarbonate solution evenly.

[0045] In this application, a stirrer 6 is installed inside the storage tank 1 to stir the sodium bicarbonate solution inside the storage tank 1 evenly. Those skilled in the art will understand that sodium bicarbonate is added to the storage tank 1 in solid powder or granular form. After mixing with water in the tank, undissolved sodium bicarbonate particles tend to settle to the bottom of the storage tank 1 due to gravity, resulting in an uneven distribution of solution concentration in the vertical direction—that is, a higher concentration at the bottom and a lower concentration at the top. If this unevenly concentrated solution is directly pumped out by the injection pump 2 and delivered to the spray pipeline, it will cause inconsistent concentrations of the mixed solution sprayed from each spray point. In some areas, the sodium bicarbonate concentration will be too low to effectively neutralize hydrogen sulfide, while in other areas, the concentration will be too high, resulting in waste of the reagent.

[0046] This solution utilizes a continuously rotating stirrer 6 within the storage tank 1 to ensure thorough mixing and uniform suspension of sodium bicarbonate and water. This guarantees a consistent solution concentration at any point within the tank, regardless of where the injection pump 2 draws the solution. Consequently, the sodium bicarbonate solution delivered to each spraying terminal maintains a stable concentration, resulting in consistent treatment effects at all spraying points. Furthermore, the uniform solution concentration facilitates accurate calculation of the dosage based on the hydrogen sulfide concentration at the working surface, contributing to precise cost control.

[0047] It is worth noting that the specific form of the agitator 6 in this solution can be flexibly selected according to the volume of the storage tank 1 and the installation space. In one feasible embodiment, the agitator 6 can be an electric agitator 6, which includes a drive motor and stirring blades. The drive motor is installed on the top or side of the storage tank 1, and the stirring blades extend into the storage tank 1. The drive motor drives the stirring blades to rotate and stir the solution. In another feasible embodiment, the agitator 6 can be a pneumatic agitator 6, which uses compressed air provided by the underground compressed air pipeline as a power source to drive the stirring blades to rotate. It does not require an electricity supply and is suitable for the special environment of underground coal mines where electrical equipment has explosion-proof requirements.

[0048] In one specific implementation, the storage tank 1 is equipped with a pH value display 7 to display the pH value of the sodium bicarbonate solution in the storage tank 1.

[0049] In this application, a pH display 7 is installed on the storage tank 1 to display the pH value of the sodium bicarbonate solution inside the storage tank 1. The concentration of the sodium bicarbonate solution is a key factor affecting the efficiency of the hydrogen sulfide neutralization reaction: when the concentration is too low, sodium bicarbonate and hydrogen sulfide cannot react fully, and the treatment effect is not up to standard; when the concentration is too high, although the reaction is sufficient, the amount of reagent consumed increases, and the treatment cost rises.

[0050] The pH display 7 monitors the solution's pH value online, reflecting the current solution concentration in real time. Based on the pH display 7 reading, operators can promptly add sodium bicarbonate when the concentration is too low and add water when the concentration is too high, ensuring the sodium bicarbonate solution in storage tank 1 remains within the optimal working concentration range. Timely intervention when the concentration deviates from the optimal range ensures effective hydrogen sulfide treatment while controlling reagent dosage and avoiding unnecessary waste.

[0051] In one specific implementation, the first connecting pipe 3 is provided with a filter for filtering impurities in the sodium bicarbonate solution.

[0052] In this application, a filter is installed on the first connecting pipe 3 to filter impurities in the sodium bicarbonate solution. When sodium bicarbonate is added to the storage tank 1 in solid powder or granule form and mixed with water to prepare the solution, the powder or granules may contain a small amount of mechanical impurities, such as dust, fibers, and sand, that may have been introduced during packaging and transportation. Furthermore, when sodium bicarbonate dissolves in water, if stirring is insufficient or the solution temperature is low, some incompletely dissolved fine particles may remain suspended in the solution. If these impurities and undissolved particles enter the injection pump 2 along with the solution, it may cause accelerated wear on precision components such as the plunger, seals, and valve core of the injection pump 2, shortening its service life. Simultaneously, after entering the delivery pipe 4, impurity particles may accumulate at the T-junction, blocking the end passage of the delivery pipe 4, affecting the normal supply of sodium bicarbonate solution, and even preventing the support spray 11 or the purification water curtain 12 from spraying normally, reducing the effectiveness of hydrogen sulfide treatment.

[0053] The filter is installed on the first connecting pipe 3, located in the pipeline section between the storage tank 1 and the injection pump 2. When the sodium bicarbonate solution drawn from the storage tank 1 by the injection pump 2 passes through the first connecting pipe 3, it first flows through the filter. Solid impurities and undissolved particles in the solution are intercepted by the filter. The clean solution after filtration then enters the injection pump 2 through the first connecting pipe 3, thereby avoiding damage to the injection pump 2 caused by impurities and blockage of the delivery pipe 4 and the T-junction.

[0054] The filter element can be made of stainless steel woven mesh or filter cloth, and its filtration accuracy can be selected according to the particle size of the sodium bicarbonate raw material and the tolerance requirements of the injection pump 2. The filter can adopt a detachable structure, which facilitates the periodic removal of the filter element for cleaning or replacement, so as to maintain the filtration effect and solution flow capacity of the filter and avoid liquid supply obstruction caused by filter screen clogging. This setting can effectively protect the injection pump 2 and downstream pipelines, ensure the stable delivery of sodium bicarbonate solution, reduce equipment maintenance frequency, and extend the service life of the equipment.

[0055] In one specific implementation, a one-way valve is provided between the delivery pipe 4 and the first three-way valve to prevent water in the water supply pipeline from flowing back into the delivery pipe 4.

[0056] In this application, a check valve is installed between the delivery pipe 4 and the first three-way valve to prevent water in the water supply pipeline from flowing back into the delivery pipe 4. Those skilled in the art will understand that in a fully mechanized mining face spray system, the water pressure in the water supply pipeline is not constant. When other water-using equipment on the working face is turned on simultaneously, the water pressure in the water supply pipeline may fluctuate or even drop, falling below the outlet pressure of the injection pump 2. In this case, water in the water supply pipeline may flow back into the delivery pipe 4 through the first three-way valve.

[0057] If water in the water supply pipeline flows back into the delivery pipe 4, on the one hand, it will dilute the concentration of sodium bicarbonate solution in the storage tank 1, causing the concentration of the mixed solution to deviate from the set value and reducing the efficiency of the hydrogen sulfide neutralization reaction; on the other hand, frequent backflow will subject the injection pump 2 to repeated pressure shocks, which can easily damage the seals of the injection pump 2 and shorten its service life.

[0058] Therefore, by setting a one-way valve, this solution not only ensures the stability of the mixing ratio of sodium bicarbonate solution and water, but also prevents the injection pump 2 from being damaged due to backflow, thus extending the service life of the equipment. At the same time, it ensures that the concentration of the solution in the storage tank 1 is not affected, which is beneficial to the stability of the treatment effect and the safety of equipment operation.

[0059] like Figure 2 As shown, in some embodiments, this application provides a method for treating hydrogen sulfide in a fully mechanized mining face, using the aforementioned treatment device, including the following steps: preparing a sodium bicarbonate solution in a storage tank 1; using an injection pump 2 to pump the sodium bicarbonate solution in the storage tank 1 through a delivery pipe 4 into a first three-way valve 5 installed on the support spray 11 pipeline; mixing the sodium bicarbonate solution with water in the support spray 11 pipeline to form a mixed liquid; spraying the mixed liquid from the support spray 11 onto the coal surface to neutralize the hydrogen sulfide gas generated during the working face production process.

[0060] The hydrogen sulfide treatment method for fully mechanized mining faces in this application includes the following steps: A sodium bicarbonate solution is prepared in storage tank 1. Sodium bicarbonate, in solid powder or granular form, is added to storage tank 1 in a set proportion and mixed with water in the tank to form a sodium bicarbonate solution of a certain concentration, which serves as the source of the solution for the neutralization reaction.

[0061] After the injection pump 2 starts, it extracts the sodium bicarbonate solution from the storage tank 1 and pumps it through the delivery pipe 4 to the first three-way valve 5 installed on the working face support spray 11 pipeline. The sodium bicarbonate solution flows into the support spray 11 pipeline through the first three-way valve 5, where it merges and mixes evenly with the water in the pipeline during the pipeline's transport process, forming a sodium bicarbonate mixture. This mixture continues to flow along the support spray 11 pipeline and is finally sprayed out by the support spray 11, covering the coal surface.

[0062] When the coal mining machine cuts the coal body, the coal body generates a large number of fissures under mechanical crushing action, and the hydrogen sulfide gas stored in the pores of the coal body is released into the working face space instantly. During the above process, the spraying operation of the support spray 11 is carried out simultaneously with the cutting operation of the coal mining machine, so that the sodium bicarbonate mixture comes into contact with the hydrogen sulfide gas at the first moment of release. The sodium bicarbonate reacts with the hydrogen sulfide to generate harmless sodium salt and water, thus completing the treatment before the hydrogen sulfide diffuses into the working face airflow in large quantities, effectively reducing the concentration of hydrogen sulfide gas at the working face from the source.

[0063] The above steps are carried out continuously during underground coal mine production operations, forming a work process that synchronizes coal mining and treatment. This allows for continuous treatment of hydrogen sulfide without interrupting coal mining operations. It features simple operation and rapid response, which is beneficial for improving the efficiency and safety of hydrogen sulfide treatment in fully mechanized mining faces.

[0064] In a specific implementation plan, the following steps are also included: the delivery pipe 4 delivers sodium bicarbonate solution to the second three-way interface set on the water supply pipeline of the roadway purification water curtain 12 through the branch pipe; the sodium bicarbonate solution and the water in the water supply pipeline of the purification water curtain 12 are mixed at the second three-way interface; the mixed solution is sprayed out from the purification water curtain 12 in the working face to carry out a secondary neutralization reaction on the hydrogen sulfide gas in the airflow.

[0065] The proposed solution further includes the following steps: While the delivery pipe 4 delivers sodium bicarbonate solution to the first three-way valve 5, it simultaneously delivers the sodium bicarbonate solution to the second three-way interface on the water supply pipeline of the roadway purification water curtain 12 via a branch pipe at its end. After flowing into the water supply pipeline of the purification water curtain 12 through the second three-way interface, the sodium bicarbonate solution mixes evenly with the water in the pipeline during transport, forming a sodium bicarbonate mixture. This mixture flows along the water supply pipeline of the purification water curtain 12 and is finally sprayed out by the purification water curtain 12 installed in the roadway.

[0066] The coal cut by the coal mining machine is continuously transported out towards the transport roadway 9 via scraper conveyors, transfer conveyors, and other equipment. During this transport process, the coal is continuously subjected to mechanical vibration, compression, and collision, gradually releasing hydrogen sulfide gas remaining in the cracks and pores of the coal and diffusing it with the airflow to areas such as the transport roadway 9 and transfer points. A sodium bicarbonate mixture sprayed from the purification water curtain 12 forms a spray barrier covering the roadway cross-section in these areas. When the airflow containing hydrogen sulfide passes through the purification water curtain 12 area, the hydrogen sulfide gas in the airflow comes into full contact with the sodium bicarbonate mixture and undergoes a neutralization reaction, achieving secondary treatment.

[0067] This method distributes sodium bicarbonate solution to the purification water curtain 12 pipeline through branch pipes, changing the purification water curtain 12 from water spray to sodium bicarbonate solution spray. This forms a second neutralization defense line along the path of hydrogen sulfide gas spreading outward from the working face with the coal flow and airflow. It performs secondary interception and neutralization of hydrogen sulfide gas that the working face support spray 11 could not completely capture, forming a multi-level protection system from source treatment at the working face to secondary treatment in the roadway, reducing the harm of hydrogen sulfide gas spreading with the airflow to downstream personnel and equipment.

[0068] In one specific implementation, the device further includes a third three-way valve and a mixing liquid pipe; the third port of the first three-way valve is connected to the first port of the third three-way valve through the mixing liquid pipe, and the second and third ports of the third three-way valve are respectively connected to the support spray pipe 11 and the purified water curtain pipe 12; after the sodium bicarbonate solution and water are mixed in the first three-way valve, they flow into the third three-way valve through the mixing liquid pipe and are distributed to the support spray pipe 11 and the purified water curtain pipe 12 for spraying.

[0069] In this application, the first three-way valve 5 is a first three-way valve, and the device also includes a third three-way valve and a mixing liquid pipe. The first three-way valve has three ports: the first port is connected to the delivery pipe 4 to receive sodium bicarbonate solution, the second port is connected to the clean water pipe 8 to introduce clean water, and the third port is connected to the first port of the third three-way valve through the mixing liquid pipe. The second port of the third three-way valve is connected to the support spray pipe 11, and the third port is connected to the purified water curtain pipe 12.

[0070] During operation, sodium bicarbonate solution enters the first port of the first three-way valve via delivery pipe 4, and clean water enters the second port of the first three-way valve via clean water pipe 8. The two solutions merge within the valve chamber of the first three-way valve, uniformly mixing to form a mixture using the turbulent flow effect. The mixture flows into the mixture pipe via the third port of the first three-way valve and is then transported to the first port of the third three-way valve. Upon entering the third three-way valve, the mixture is divided into two paths through the valve's internal flow channel: one path flows into the support spray 11 pipe via the second port and is sprayed onto the coal surface by the support spray 11; the other path flows into the purification water curtain 12 pipe via the third port and is sprayed into the roadway airflow by the purification water curtain 12.

[0071] This scheme separates the mixing and distribution stations. The sodium bicarbonate solution and water are mixed only once at the source through the first three-way valve. After being transported through the mixed liquid pipe to the third three-way valve, it is directly distributed to the two spray terminals. Operators only need to adjust the mixing ratio uniformly at the first three-way valve to ensure that the concentration of the mixed liquid sprayed from the two spray terminals is consistent. This avoids the problem of inconsistent concentration caused by adjustment deviations when mixing at each spray point, which helps to simplify the operation process and ensure the uniformity of the mixed liquid concentration at each spray terminal.

[0072] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A hydrogen sulfide treatment device for fully mechanized mining faces, characterized in that, include: A storage tank is used to store sodium bicarbonate solution; The injection pump is connected to the storage tank via a first connecting pipe; as well as The delivery pipe has one end connected to the injection pump and the other end connected to the first three-way valve installed on the spray pipe of the working face support. The injection pump is used to pump the sodium bicarbonate solution in the storage tank into the first three-way valve through the delivery pipe, so that the sodium bicarbonate solution mixes with the water in the support spray pipeline and is sprayed out by the support spray to the surface of the coal body.

2. The treatment device according to claim 1, characterized in that, The other end of the conveying pipe is also provided with a branch pipe, which is connected to the second tee interface provided on the water supply pipeline of the roadway purification water curtain. The injection pump pumps sodium bicarbonate solution into the purified water curtain supply pipeline, so that the sodium bicarbonate solution mixes with the water in the purified water curtain supply pipeline and is then sprayed out from the purified water curtain inside the working face.

3. The treatment device according to claim 1, characterized in that, The device also includes a third three-way valve and a mixing pipe; The first port of the first three-way valve is connected to the delivery pipe, the second port is connected to the clean water pipe, and the third port is connected to one end of the mixed liquid pipe; The first port of the third three-way valve is connected to the other end of the mixed liquid pipe, the second port is connected to the spray pipe of the working face support, and the third port is connected to the roadway purification water curtain pipe.

4. The treatment device according to any one of claims 1-3, characterized in that, The storage tank is equipped with a stirrer for stirring the sodium bicarbonate solution evenly.

5. The treatment device according to any one of claims 1-3, characterized in that, The storage tank is equipped with a pH display to show the pH value of the sodium bicarbonate solution inside the tank.

6. The treatment device according to claim 1, characterized in that, The first connecting pipe is equipped with a filter for filtering impurities in the sodium bicarbonate solution.

7. The treatment device according to claim 1, characterized in that, A one-way valve is provided between the delivery pipe and the first three-way valve to prevent water in the water supply pipeline from flowing back into the delivery pipe.

8. A method for controlling hydrogen sulfide in a fully mechanized mining face, characterized in that, The treatment apparatus according to any one of claims 1-7 comprises the following steps: Prepare a sodium bicarbonate solution in the storage tank; The sodium bicarbonate solution in the storage tank is pumped into the first three-way valve installed on the spray pipe of the support using an injection pump. The sodium bicarbonate solution is mixed with water in the spray pipe of the support to form a mixture; The mixture is sprayed onto the coal surface by a support sprayer, where it neutralizes the hydrogen sulfide gas generated during the working face production process.

9. The method according to claim 8, characterized in that, It also includes the following steps: The delivery pipe simultaneously delivers sodium bicarbonate solution to the second tee interface on the water supply pipeline of the roadway purification water curtain through the branch pipe. The sodium bicarbonate solution is mixed with the water in the purified water curtain supply pipeline at the second three-way interface; The mixed solution is sprayed out from the purification water curtain inside the working face to carry out a secondary neutralization reaction on the hydrogen sulfide gas in the airflow.

10. The method according to claim 8, characterized in that, The device also includes a third three-way valve and a mixing pipe; The third port of the first three-way valve is connected to the first port of the third three-way valve through the mixing liquid pipe, and the second and third ports of the third three-way valve are respectively connected to the bracket spray pipe and the purification water curtain pipe; After the sodium bicarbonate solution and water are mixed at the first three-way valve, the mixture flows into the third three-way valve through the mixing pipe and is then distributed to the support spray pipe and the purified water curtain pipe for spraying.

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