WO2014083581A1

WO2014083581A1 - Gas-based explosive device

Info

Publication number: WO2014083581A1
Application number: PCT/IN2013/000720
Authority: WO
Inventors: Koulick GHOSH; Arpit DAVE; Sagnik CHAKRABORTY
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-11-28
Filing date: 2013-11-28
Publication date: 2014-06-05
Anticipated expiration: 2015-05-28

Abstract

The present subject matter discloses a gas-based explosive device (100) for blasting rocks in mines, the gas-based explosive device (100) comprises a first compartment (102) for storing a first reactant. The gas-based explosive device (100) further comprises a second compartment (104), adapted to be coupled to the first compartment (102), for storing a second reactant. Further, the gas-based explosive device (100) comprises a reaction trigger (106), adapted to be coupled to the between the first compartment (102) and the second compartment (104), for allowing the first reactant to move to the second compartment (104). The first reactant forms a fuel gas upon reacting with the second reactant. Further, the gas-based explosive device comprises a detonator, adapted to be wound over the first compartment (102) and the second compartment (104), to detonate the fuel gas by way of oxidization.

Description

GAS-BASED EXPLOSIVE DEVICE

FIELD OF INVENTION

[0001] The present subject matter relates to a gas-based explosive device, and, particularly, but not exclusively, to systems and methods for producing a gas-based explosive device for blasting rocks in mines.

BACKGROUND

[0002] Explosives may be defined as reactive substances capable of producing an explosion, when excited physically or chemically, usually accompanied by the production of light, heat, sound, and pressure. The explosives are primarily used in warfare and mining industries. In mining, the explosives are typically used to break rocks. For the purpose, generally a hole is drilled in the rock and filled with the explosive. The explosive is then detonated to break the rock into pieces which can be removed for further processing. Generally, the explosives that emit large amount of gases are preferred as it is often needed to throw away the blasted rocks.

[0003] Further, the explosives used for mining industry need to be manufactured according to rules and guidelines specified by government. For instance, as per one of the guidelines, the explosives should produce little or no flame while exploding and should explode at low temperatures to prevent secondary explosions of mine gases and dust.

BRIEF DESCRIPTION OF THE FIGURES

[0004] The detailed description is described with reference to the accompanying figures.

In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system and/or methods in accordance with embodiments of the present subject matter are now described, by way of example only, and with reference to the accompanying figures, in which:

[0005] Figures 1(a), 1(b), 1(c), and 1(d) illustrate various designs of a gas-based explosive device for blasting rocks in mines, in accordance with various embodiments of the present subject matter. [0006] Figure 2 illustrates an exemplary method for producing a gas-based explosion, in accordance with an embodiment of the present subject matter.

[0007] Figure 3 illustrates a graphical representation depicting variation in maximum shock wave pressure created by an explosion with time, in accordance with an embodiment of the present subject matter.

[0008] It should be appreciated by those skilled in the art that any block diagrams herein represent conceptual views of illustrative systems embodying the principles of the present subject matter.

DETAILED DESCRIPTION

[0009] Generally explosives, such as a mixture of Ammonium Nitrate and fuel oil

(ANFO), Nitroglycerine, and Nitrocellulose (Gunpowder) are used in mining for blasting of rocks. The explosives are typically in granular, gelatin, slurry or emulsion form and are manufactured using chemicals that are stable under normal conditions. The explosives are thus typically initiated using an initiator and subsequently energized using a booster device to cause the explosion. The initiator is generally a highly combustive explosive used to initiate the explosion and the booster device is used to boost the explosion to create a larger explosion for breaking of rocks. The use of the initiator and the booster may, however, increase the cost of the mining operation.

[0010] Further, extra care is needed in keeping the explosives at a blasting site and moving the explosive from one place to another as the explosive are generally high combustible and a slight negligence may cause accidents. Further, when an explosion is caused by an explosive at the blasting site, certain unwanted emissions may also occur due to the explosion.

These emissions may pollute the environment and infect miners working at the blasting site.

Therefore, the conventionally used explosives have a high operating cost and negative impact on the environment and the miners.

[0011] The present subject matter discloses systems and methods for producing a gas- based explosive device for blasting rocks in mines. In one embodiment of the present subject matter the gas-based explosive device includes reactants that may react together to form an unstable hydrocarbon gas which releases enormous energy upon oxidization. For instance, powdered Calcium Carbide (CaC₂) and Water (H₂0) may be used as the reactants for producing the unstable hydrocarbon, Acetylene (C₂H₂). The unstable hydrocarbon may then be exposed to the air to get oxidized and thereby release energy in the form of the sock wave to blast the rock. The gas-bas explosive of the present subject matter is simple and easy to manufacture. Further, boosters are not required to boost the explosion since enormous energy is released when the gas- based explosive device explodes, thus reducing the operating cost of mining.

[0012] Further, in order to carry out the reactions for creating the explosion, a gas-based explosive device, hereinafter referred to as a device, may be used. The device may comprise a first compartment and a second compartment coupled to each other. In one implementation, the first compartment and the second compartment may be coupled through a check valve. The check valve acts as a reaction trigger, which upon opening, triggers the reaction between the reactants stored in the first compartment and the second compartment. The device further comprises a detonator used for triggering the explosion by exposing the acetylene to the air.

[0013] In one implementation, a first reactant and a second reactant may be stored in the first compartment and the second compartment, respectively. Thereafter, a miner may initiate the reaction trigger to allow the first reactant to slowly move to the second compartment. For instance, the miner may open the reaction trigger, i.e., a check valve to allow the first reactant to move to the second compartment. In the second compartment, the first reactant reacts with the second reactant to form the unstable hydrocarbon gas, hereinafter referred to as a fuel gas. Subsequently, the device may be put between the rocks or in a borehole for blasting of the rocks. In an example, powdered calcium carbide and water may be used as the first reactant and the second reactant, respectively. The powdered calcium carbide upon reacting with the water produces Acetylene in the second compartment.

[0014] Further, once a predefined pressure is developed inside the second compartment due to production of the acetylene, the miner may trigger the detonator to cause a blast. The blast causes the device to burst open and expose the fuel gas to the air so that oxidization of the fuel gas take place to create an explosion huge enough to break the rocks. In one implementation, an explosive wire may be used as the detonator. The explosive wire may be wound over the first compartment and the second compartment of the device. Thereafter, an electrical signal may be sent to the detonator to break the device to expose the fuel gas to air. The fuel gas, upon oxidation, results in an explosion combustion which generates energy and pressure in the form of a shock wave which blasts the rocks present in the surrounding of the device.

[0015] In one embodiment, an oxygen chamber may be provided in the device so that sufficient oxygen is available for oxidization of the fuel gas inside the device. [0016] Thus, the present subject matter provides a cost effective and easy to manufacture gas-based explosive device. Further, since the gas-based explosive device is produced by assembling different components and filling the reactants at a blasting site, chances of any accident are reduced. Furthermore, considering a significant reduction in the cost of producing the explosive, the operating costs of the mining project is likely to be decreased. Further, with the present subject matter, there is no emission of harmful gases, such, as NO_x. Furthermore, the explosive is designed such that the unstable hydrocarbon gas can be blasted one side of the explosive, i.e., in the second compartment. This helps in concentrating the energy on one side, which results in efficient blasting.

[0017] These and other advantages of the present subject matter would be described in greater detail in conjunction with the following figures. While aspects of described systems and methods for determining physiological parameters can be implemented in any number of different computing systems, environments, and/or configurations, the embodiments are described in the context of the following figure(s).

[0018] Figures 1(a), 1(b), 1(c), and 1(d) illustrate various designs of a gas-based explosive device 100, in accordance with various embodiments of the present subject matter.

[0019] Figure 1(a) illustrates the gas-based explosive device 100, hereinafter referred to as a device 100. As shown in Figure 1(a), the device 100 comprises a first compartment 102 and a second compartment 104 coupled to each other through a reaction trigger 106. In an example, a check valve may be used as the reaction trigger 106 to couple the first compartment 102 to the second compartment 104. As shown in Figure 1(a), a bottom end of the first compartment 102 is coupled to a top end of the second compartment 104 through the reaction trigger 106. Further, a first end of the reaction trigger is coupled to the bottom end of the first compartment 102 and a second end of the second compartment 104 is coupled to the top end of the second compartment 104. The reaction trigger 106 thus allows the movement of a reactant from the first compartment 102 to the second compartment 104 upon opening and also couples the first compartment 102 and the second compartment 104 with each other. In operation, when the reaction trigger 106 is initiated, the reactant stored in the first compartment 102 may start moving to the second compartment 104.

[0020] Further, the first compartment 102 and the second compartment 104 are made of high pressure composite, such as poly vinyl chloride (PVC) and Teflon to create suitable pressure for carrying out the reaction between the first reactant and the second reactant. The first compartment 102 may be used for storing a first reactant and the second compartment 104 may be used for storing a second reactant.

[0021] In one implementation, the device 100, comprising the first compartment 102 and the second compartment 104, may have a height substantially ranging from 0.1 to 20 meter (m) and a diameter substantially ranging from 10 to 500 millimeter (mm). It may be understood to a person skilled in the art that dimensions of the device 100 may vary from site to site, as size of boreholes vary with the mines. For instance, sometimes large boulders are formed during the blasting process and in order to further blast these, small holes with diameter of less than 100 mm and height of less than 0.5 m are drilled into these boulders and then charged with explosives. One of the objectives of the height and the diameter is to obtain a suitable pressure upon production of the unstable hydrocarbon gas within the dimensions of the available boreholes, and thus generate a Shockwave to cause a blast.

[0022] The reaction trigger 106 allows the first reactant to move to the second compartment 104 to form an unstable hydrocarbon gas, also referred to as a fuel gas, by reacting with the second reactant. The second compartment 104 retains the fuel gas till a predefined pressured is reached. In one implementation, the predefined pressure may substantially range from 400 to 700 pounds per square inch (psi). The detonator may then be used for exposing the fuel gas to create an explosion. In an example, an explosive wire may be used as the detonator. The explosive wire may be wrapped around the first compartment 102 and the second compartment 104 so that the device 100 bursts to expose the fuel gas to air for causing the explosion.

[0023] In one implementation, powdered calcium carbide and water may be used as the first reactant and the second reactant respectively, to produce Acetylene to create an explosion for blasting the rocks. In said implementation, when the reaction trigger 106 is triggered by a miner the calcium carbide starts to move to the second compartment 104. In the second compartment 104, the powdered calcium carbide reacts with the water to form acetylene gas, whose oxidation is explosive in nature. Equation 1 illustrates the chemical reaction between Calcium Carbide (CaC₂) and Water (H₂0) to produce Acetylene (C₂H₂).

CaC₂ + 2H₂0→ C₂H₂ + Ca(OH)₂ (1)

[0024] . Further, when a sufficiently high pressure is developed inside the device 100 due to formation of the acetylene, the detonator triggers the explosion by breaking the device 100. Due to breaking the breaking of the device 100, the acetylene gets exposed to the air present in the surroundings. When the Acetylene (C₂H₂) is exposed to the air, oxidization of the Acetylene (C₂H₂) takes place due to presence of the oxygen in air and an explosion is produced. Considering a chemically unstable phase of the fuel gas undergoing oxidation at high pressure, gaseous mixture of Acetylene (C₂H₂) detonation can also be initiated without using any initiators, such as a spark plug. Equation 2 provided below illustrates oxidization of Acetylene (C₂H₂).

2C₂H₂ + 50₂→ 4C0₂ + 2H₂0 AH = -1299kJ/mol (2)

[0025] Further, oxidation of Acetylene releases Carbon Dioxide (C0₂) as a by-product and there are no NO_x emissions which ensure environmental safety. The energy propagated as well as pressure and velocity of shock wave generated due to this oxidation is sufficient to serve as an effective explosive for blasting the rocks. In one implementation, de-oxygenated water may be added to the second compartment 104 at the blasting site for eliminating concerns related to safety.

[0026] Further, an air-evacuation mechanism is devised in the device 100 to evacuate the air present inside the first compartment 102 and the second compartment 104, to prevent any premature explosion during formation of the fuel gas in the second compartment 104. The air- evacuation can be done either at the blasting site or while manufacturing the first compartment 102 and the second compartments 104. In one implementation, valves may be provided in the first compartment 102 and the second compartment 104 to evacuate the air present inside the device 100. In another implementation, oxygen absorbing materials, for example, Calcium Hydroxide, may be coated on inner walls of the first compartment 102 and the second compartment 104 to absorb oxygen present in the device 100.

[0027] In one implementation, a spark plug may also be used in the device 100 to initiate the combustion of the fuel gas to create an explosion for blasting the rocks. Further, at blasting sites where oxygen content of air is not enough for proper combustion of the fuel gas, the device 100 may also comprise an oxygen chamber 108 to make sure enough oxygen is available during the combustion of fuel gas. In one implementation, a chemical arrangement for producing oxygen may be used in the oxygen chamber 108 to produce the oxygen

[0028] Figure 1(b) illustrates another design of the device 100. The device 100 comprises of two evacuated compartments, i.e., the first compartment 102 and the second compartment 104 of differing volumes. As shown in Figure 1(b), the device 100 has the oxygen chamber 108 inside the second compartment 104. In one implementation, the first compartment 102 may have a predefined height and volume for storing powdered Calcium Carbide (CaC₂) based on type of rock to be blasted. Further, the second compartment 104 may be used for storing water and fits directly onto the first compartment 102 through the check valve or a non return valve (NRV).

[0029] Further, the fuel gas produced in the second compartment 104, as a result of the reaction, is confined to the second compartment 104 the predefined pressure is reached. One of the advantages of the device 100 is availability of the oxygen within the second compartment 104 which ensures complete combustion of the fuel gas. Further, since the device 100 is obtained by assembling the first compartment 102 and the second compartment 104, both the compartments can be installed and transported separately. In one implementation, the second compartment 104 may be made from Polyvinyl Chloride (PVC) or Teflon and the oxygen chamber 108 may be made from synthetic rubber and plastic tubing.

[0030] Figure 1(c) illustrates another design of the device 100. As shown in Figure 1(c), the device 100 comprises two evacuated compartments, i.e., the first compartment 102 and the second compartment 104. The second compartment 104 of the device 100 is partitioned for making a first oxygen chamber 108-1 and a second oxygen chamber 108-2. This design of the device 100 may help in achieving a positive oxygen balance for the explosive reaction.

[0031] Figure 1(d) illustrates another design of the device 100. As shown in Figure 1(d), the device 100 has a shape similar to flexible tubes. The device 100 is made flexible so that the device 100 can be easily accommodated in deep boreholes. Further, a sealing mechanism is provided in the device 100 to support the explosion pressure without any mechanical failure. One of the advantages of this design is the relative simplicity in construction, installation, and manufacture. Also, there is possibility of expansion in volume to accommodate varying amounts of gas for differing explosion intensities. [0032] It may be understood that the aforementioned designs of the device 100 can be combined with presently used explosives where the detonation of the explosives can be triggered using the device 100. Although, some design possibilities have been explained in the description above, it is evident to a person skilled in the art that other design possibilities are also possible without deviating from the scope of the present subject matter.

[0033] Figure 2 illustrates an exemplary method of producing a gas-based explosive for blasting rocks in mines, in accordance with an embodiment of the present subject matter. The order in which the method 200 is described is not intended to be construed as a limitation, and any number of the described method blocks can be combined in any order to implement the method 200, or an alternative method. Additionally, individual blocks may be deleted from the method 200 without departing from the, spirit and scope of the subject matter described herein. Furthermore, the method 200 may be implemented in any suitable hardware, software, firmware, or combination thereof.

[0034] At block 202, first reactant is stored in a first compartment 102 and a second reactant is stored in a second compartment 104. In one implementation, powdered Calcium carbide (CaC₂) may be stored in the first and Water (H₂0) may be stored in second compartment 104.

[0035] At block 204, the first compartment 102 and the second compartment 104 are coupled to each other through a reaction trigger 106 to form a device 100 for producing a fuel gas. In one implementation, the reaction trigger may be a check valve which can be opened by a miner to trigger a reaction of the first reactant and the reactant. The check valve allows the first reactant to move to the second compartment.

[0036] At block 206, initiating the reaction trigger to allow the first reactant to the second compartment 104 to form a fuel gas. In one implementation, the reaction trigger 106 allows mixing of the first reactant and the second reactant in the second compartment. In one example, the Calcium carbide (CaC₂) and water (H₂0) are mixed together to obtain an unstable hydrocarbon, i.e., Acetylene (C₂H₂) which upon oxidation causes a blast.

[0037] At block 208, detonator is triggered to burst the device 100 to create an explosion by oxidizing the fuel gas for blasting the rocks. The device 100 is burst, once a predefined pressure is developed inside the reaction compartment due to production of the fuel gas. The predefined pressure may be then used for auto ignition of the fuel gas on exposure to air. In an example, the predefined pressure may be developed inside the second compartment due to production of the Acetylene (C₂H₂). Further, the predefined pressure developed by production of Acetylene (C₂H₂) may be used for auto ignition of the fuel gas on exposure to air. The oxidization of the acetylene releases high amount of energy in a very short span of in range of 5- 10 millisecond. This leads to formation of a shock wave, which causes breaking of rocks. Also, gases released as a result of combustion causes bending of rocks. In this manner, the rocks are blasted in mines by producing the gas-based explosive using the device 100. VERIFICATION & VALIDATION RESULT

[0038] In order to optimize reaction conditions, velocity of shock wave produced and other parameters, such as explosion of pure Acetylene gas, a major part of hydrocarbon fuel, in air were simulated using analysis system (ANSYS). The reaction conditions were then optimized on the basis of time dependence values of the pressure generated during the explosion. Based on the simulation, pressure, temperature profiles, density, mass and volume flow rates were obtained based on which the maximum pressure of the Shockwave generated was determined.

[0039] In order to simulate the explosion, a non-premixed combustion model for simulation of combustion of pure Acetylene in an open confinement containing Air was carried out using ANSYS Workbench 2.0 Framework (Version 12.0) with FLUENT (an inbuilt solver of Workbench) as fluid combustion solver. A two-dimensional mesh was created having following specifications: Height of Fuel Cylinder = 20 meter (m) and Diameter of Fuel Cylinder = 34 centimeter (cm).

[0040] In one implementation, various parameters in the FLUENT may be set to predefined values: The predefined values are given in Table 1 provided below.

Table 1 Models: Materials:

Energy: On Mixture -> PDF mixture consisting

Viscous: Standard k-e model, Standard Wall various products and partial-products of Function combustion of Acetylene in atmospheric air

Radiation: PI model

Fluid -> Air

Species: Non Premixed Combustion

Models Species Model details:

Cell Zone Conditions:

Inlet Diffusion turned On

Zone -> Fluid

Non Premixed Combustion - Chemistry:

Operating Pressure 101325 Pa

State Relation: Equilibrium

Boundary Conditions:

Energy: Non-Adiabatic Operating Pressure:

101325 Pa Fuel Inlet is adjusted to enter the combustion zone through all walls of

Fuel Stream Rich Flammability Level: .095

cylinder present mesh at an Absolute

Non Premixed Combustion - Boundary: Pressure 1500 Psi.

Oxidizer: Air at 300K Oxidizer (Air) Inlet is set through all the 4

Fuel: Acetylene at 674K boundaries of domain at atmospheric pressure of 101325 Pa.

With above conditions a few default settings a

PDF table is calculated to incorporate Dynamic Mesh -> Off

thermodynamic properties of chemicals. Reference Values -> Default

[0041] Table 1 provides the predefined conditions to which the solver, FLUENT, was set before running the simulations. As provided in Table 1, models used for simulation of the explosion are standard k-e model and PI model. Further, mixture and fuel to be used are provided. Table 1 also provides operating conditions, such as cell zone conditions and boundary conditions based on which the simulation is carried out. [0042] Further, all the settings were set to their default values except for Solution Method for Pressure calculation, which is set to PRESTO! Time values for which solver was ran are provided in Table 2.

[0043] In Table 2, maximum shock wave pressure, maximum velocity, density point of maximum pressure, and temperature are given at different points in time at a distance x from a point of maximum pressure. As depicted in the table, maximum shock wave pressure is obtained after 0.00101 seconds. This maximum pressure has the maximum velocity of 116581.25 meter per second (m/s) and is measured at a distance of -5.26E+00 meters (m) from the point of explosion.

[0044] Figure 3 illustrates a graphical representation of variation in maximum shock wave pressure caused by an explosion with time, in accordance with an embodiment of the present subject matter. As shown in Figure 3, X axis represent time and Y axis represents maximum shock wave pressure created by the explosion. Figure 3 depicts that the maximum shock wave pressure is obtained after 1.1 seconds of the explosion and once the maximum shock wave pressure is obtained, there is a rapid decrease in the shock wave pressure.

[0045] Further, for calculation of optimal initial pressure and diameter of the second compartment, ANSYS with FLUENT as the solver were used to generate maximum, average and integral value of the impulse at the wall of the bore hole at an Initial temperature of 550 K. Further, variation of impulse with Initial pressure and the diameter of the fuel-cylinder values are provided in Table 3, Table 4, and Table 5.

[0046] Table 3 provides maximum impulse per unit area (Ns/m2) obtained for different values of initial pressure and diameter. Table 3

[0047] Table 4 provides average impulse per unit area (Ns/m2) obtained for different values of initial pressure and diameter.

Table 4

[0048] Table 5 provides integral impulse per unit area (Ns/m2) obtained for different values of initial pressure and diameter.

Table 5 Initial Pressure (psi)

400psi 450psi 500psi Diameter (inches)

3 inches(76.2mm) 3.75 lO⁵ Ns/m2 3.75 l0⁵ Ns/m2 4.25x10^s Ns/m2

4 inches(101.6mm) 5.5x10^s Ns/m2 6.4x10^s Ns/m2 2.375x10^s Ns/m2

[0049] Further, using the tables 3, 4, and 5, the optimum Initial pressure and pipe diameter can be calculated.

[0050] Mass of the fuel gas may be calculated with the help of Equation 3.

M = (Pi * ((pi)*D*D*h/4))/(R*T) (3)

[0051] Where, D is diameter of the second compartment; Pi is initial pressure; h is length of the second compartment = 8000mm; R is Gas constant for Acetylene = 319.77 J/K-kg; and T is Initial temperature = 550K.

[0052] Pressure variation at the wall of the second compartment may be calculated through Equation 4. :

P = (A*R/ C_v * sqrt(2*K/V)*t + (Cp +R)/Cv)^A(-(Cp+R)/R) (4)

[0053] Where, D is diameter of second compartment; A is Surface area of the second compartment = π ϋ ΐι; V is Volume of the second compartment = ((7i)xD²xh/4); t is time; C_v is specific heat capacity at constant volume = 1339 J/kg-K; C_p is specific heat capacity at constant pressure = 1658.77 J kg-K; and K = P ^Cv/(cP^+R» M

[0054] Temperature variation at the wall the second compartment may be calculated through Equation 5.

T = (K*V/R)*(A*R/ C_v * sqrt(2*K/V)*t + (Cp +R)/Cv)^A(-2) ....(5)

[0055] Where, A is Surface area of the second compartment; V is volume of the cylinder; K = P ^Cv/(cP^+r» /M; CV is specific heat capacity at constant volume = 1339 J/kg-K; Cp is specific heat capacity at constant pressure = 1658.77 J/kg-K; and t is time. Thus, using the above equations 3, 4, and 5 all the needed specifications can be calculated. [0056] Although implementations for producing the gas-based explosive device have been described in language specific to structural features and/or methods, it is to be understood that the same are not necessarily limited to the specific features or methods described. Rather, the specific features and methods are disclosed'as exemplary implementations for producing gas- based explosive device.

Claims

I/We Claim:

1. A gas-based explosive device (100) for blasting rocks in mines, the gas-based explosive device (100) comprises:

a first compartment (102) for storing a first reactant;

a second compartment (104), adapted to be coupled to the first compartment (102), for storing a second reactant; and

a reaction trigger (106), adapted to be coupled to the first compartment (102) and the second compartment (104), for allowing the first reactant to move to the second compartment (104), wherein the first reactant forms a fuel gas upon reacting with the second reactant; and

a detonator, adapted to be wound over the first compartment (102) and the second compartment (104), to detonate the fuel gas by way of oxidization.

2. The gas-based explosive device (100) as claimed in claim 1, wherein the second compartment (104) comprises an oxygen chamber (108) for storing oxygen to be used for oxidizing the fuel gas.

3. The gas-based explosive device (100) as claimed in claim 1, wherein the reaction trigger (106) is a check valve that allows the first reactant to move to the second compartment (104).

4. The gas-based explosive device (100) as claimed in claim 1, wherein the detonator is an explosive wire adapted to be wound over the first compartment (102) and the second compartment (104) to trigger the explosion.

5. The gas-based explosive device (100) as claimed in claim 1, wherein the second compartment (104) comprises a valve to evacuate air present in the second compartment (104).

6. The gas-based explosive device (100) as claimed in any of the preceding claims, wherein the first reactant is powdered Calcium Carbide (CaC₂) and the second reactant is Water (¾0).

7. The gas-based explosive device (100) as claimed in claim 1 or 6, wherein the reaction trigger (106) moves the powdered Calcium Carbide (CaC₂) to the second compartment ( 104) to form Acetylene (C₂H₂) by reacting with the Water (H₂0).

8. The gas-based explosive device (100) as claimed in claim 1 or 7, wherein the detonator bursts the gas-based explosive device (100) to create an explosion by oxidization of the Acetylene.

9. The gas-based explosive device (100) as claimed in claim 1 further comprises an initiator to initiate combustion of the fuel gas.

10. A method for creating an explosive for blasting rocks in mines, the method comprises:

storing a first reactant in a first compartment (102) and a second reactant in a second compartment ( 104) ;

coupling the first compartment (102) to the second compartment (104) to form a gas-based explosive device (100);

initiating a reaction trigger to allow the first reactant to move to the second compartment (104) to form a fuel gas; and

triggering a detonator to burst the gas-based explosive device (100) for creating an explosion to blast the rocks, wherein the explosion is created due to oxidization of the fuel gas at a predefined pressure.

11. The method as claimed in claim 10, wherein the storing comprises filling the first compartment (102) with powdered Calcium carbide (CaC₂) and the second compartment (104) with Water (H₂0).

12. The method as claimed in claim 10 or 11, wherein the initiating comprises mixing the powdered Calcium Carbide (CaC₂) with the Water (H₂0) in the second compartment (104) to form Acetylene.

13. An gas-based explosive device (100) for blasting rocks in mines, the gas-based explosive device (100) comprising:

a first compartment (102) for storing a first reactant;

a second compartment (104), coupled to the first compartment (102), for storing a second reactant;

a reaction trigger (106), coupled to the first compartment (102) and the second compartment (104), for allowing the first reactant to move to the second compartment (104) to form a fuel gas by reacting with the second reactant; and a detonator, coupled to the first compartment (102) and the second compartment (104), to burst the gas-based explosive device (100) to create an explosion by oxidizing the fuel gas for blasting the rocks.

The gas-based explosive device (100) as claimed in claim 13 further comprises an oxygen chamber (108) for storing oxygen to be used for oxidizing the fuel gas.

The gas-based explosive device (100) as claimed in claim 13 further comprises a valve to evacuate air from the gas-based explosive device (100).