Energy-saving thermal insulation system for preparing water-gel explosive
By adopting an energy-saving and insulation system in the production of water glue explosives, using air energy equipment and waste heat recovery, the problem of insufficient heat utilization in the methylamine nitrate reactor is solved, and significant energy consumption saving and efficient insulation of the methylamine nitrate storage tank are achieved.
Patent Information
- Application Number
- CN202422068721.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-26
AI Technical Summary
During the production process of water glue explosives, the heat in the methylamine nitrate reactor is difficult to effectively utilize, resulting in high energy consumption and the methylamine nitrate solution is prone to crystallization at low temperatures, increasing the insulation requirement.
The energy-saving and insulation system is adopted, including an air energy unit, a heat recovery circulation unit and a storage tank insulation circulation unit. Through air energy equipment and waste heat recovery, the waste heat in the methylamine nitrate reactor is collected, and mixed hot water accompanying pipes are used to provide insulation for the methylamine nitrate storage tank.
It effectively saves the energy consumption costs of civil explosives manufacturers, improves the insulation safety and reliability of methylamine nitrate storage tanks, and reduces the crystallization risk of methylamine nitrate solution.
Smart Images
Figure CN222975095U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of civil explosive production, and particularly relates to an energy-saving and heat-preserving system for the preparation of water gel explosive. Background Art
[0002] Water gel explosive is a water-containing explosive that uses water-soluble sensitizers and density regulators mainly composed of methylamine nitrate to ensure its detonator sensitivity under small-diameter conditions.
[0003] As Figure 2 shown, in the production process of water gel explosive, the reaction between nitric acid and monomethylamine in the methylamine nitrate reactor is violent and generates a large amount of heat. To control the reaction temperature and prevent explosion accidents, it is necessary to cool the reaction solution through the cooling water circulation coil in the methylamine nitrate reactor, and the circulating water cools the hot water in the methylamine nitrate reactor through a cooling tower, a cold water circulation pump, and a circulation pipeline. A large amount of concentrated and uncontrollable heat is wasted in this process.
[0004] At the same time, when the methylamine nitrate solution meeting the process requirements is below 50 degrees Celsius, a large amount of crystallization will occur. Therefore, during the storage and transportation cycle of the methylamine nitrate solution, a large amount of heat is required to keep it warm. Under the existing technology, the process heat source of civil explosive production enterprises mostly uses electric energy for heating, and a few use natural gas for heating, resulting in a relatively high heating cost. Content of the Utility Model
[0005] The purpose of the utility model is to provide an energy-saving and heat-preserving system for the preparation of water gel explosive to solve the above-mentioned deficiencies of the prior art.
[0006] To achieve the above purpose, the utility model adopts the following technical solutions:
[0007] An energy-saving and heat-insulating system for the preparation of water gel explosive, comprising: a water storage tank, which is connected to a water inlet device through a water treatment device; an air energy unit, including a plurality of air energy devices and an air energy pump connected to the water storage tank through an inlet pipe and a return pipe, wherein the air energy pump is arranged on the inlet pipe to form an air energy heating circulation pipeline; a heat recovery circulation unit, including a heat exchanger, a methylamine nitrate reactor, a cooling coil arranged in the methylamine nitrate reactor, and a cooling tower; the water outlet of the cooling coil is connected to the heat source water inlet of the heat exchanger through a pipeline, the heat source water outlet of the heat exchanger is connected to the water inlet of the cooling tower through a pipeline, and the water outlet of the cooling tower is connected to the water inlet of the cooling coil through a pipeline provided with a cold water circulation pump to form a heat source circulation pipeline; the water storage tank is connected to the cold source water inlet of the heat exchanger through a pipeline provided with a heat exchanger pump, and the cold source water outlet of the heat exchanger is connected to the water storage tank to form a cold source circulation pipeline; a storage tank heat-insulating circulation unit, including a methylamine nitrate storage tank and a heat-insulating coil arranged in the methylamine nitrate storage tank; the water outlet of the heat-insulating coil is connected to the water storage tank through a heat-insulating return water valve, and the water storage tank is sequentially connected to the water inlet of the heat-insulating coil through a neutralization hot water pump and a heat-insulating water inlet valve; the methylamine nitrate storage tank is connected with a methylamine nitrate circulation pipeline and is connected to the methylamine nitrate reactor through a discharging valve, and a mixed hot water tracing pipe for insulating the methylamine nitrate circulation pipeline is also arranged at the methylamine nitrate circulation pipeline.
[0008] Further, the methylamine nitrate circulation pipeline includes a methylamine nitrate feed pipe and a methylamine nitrate discharge pipe, and the mixed hot water tracing pipe includes a mixed hot water return pipe arranged at the methylamine nitrate feed pipe and a mixed hot water inlet pipe arranged at the methylamine nitrate discharge pipe.
[0009] Further, the heat-insulating water inlet valve is a double L-shaped four-way electric ball valve, and its four interfaces are respectively connected to the mixed hot water inlet pipe, short-circuited to the heat-insulating return water valve, connected to the water outlet of the neutralization hot water pump, and connected to the water inlet of the heat-insulating coil.
[0010] Further, the heat-insulating water inlet valve has two working states, A and B. Its working state A is that the mixed hot water inlet pipe is short-circuited to the heat-insulating return water valve, and the water outlet of the neutralization hot water pump is communicated with the water inlet of the heat-insulating coil; its working state B is that the mixed hot water inlet pipe is communicated with the water inlet of the heat-insulating coil, and the water outlet of the neutralization hot water pump is short-circuited to the heat-insulating return water valve.
[0011] Further, the heat-insulating return water valve is a double L-shaped four-way electric ball valve, and its four interfaces are respectively connected to the mixed hot water return pipe, short-circuited to the heat-insulating water inlet valve, connected to the water storage tank, and connected to the water outlet of the heat-insulating coil.
[0012] Furthermore, the heat preservation return water valve includes two working states, namely state a and state b. In state a, the mixed hot water return pipe is short-circuited with the heat preservation inlet valve, and the water storage tank is communicated with the water outlet of the heat preservation coil pipe. In state b, the mixed hot water return pipe is communicated with the water outlet of the heat preservation coil pipe, and the water storage tank is short-circuited with the heat preservation inlet valve.
[0013] As can be seen from the above technical solutions, the energy-saving heat preservation system of the present utility model for the preparation of water gel explosive conducts heat preservation work through two heating systems, namely the neutralization energy-saving system and the mixed hot water companion pipe. During the day, it can fully collect the waste heat generated by the reaction in the methylamine nitrate reactor, and at night, it uses the hot water in the water storage pipe to keep the solution in the methylamine nitrate storage tank warm. Through the application of air energy equipment and waste heat recovery, the energy consumption cost of civil explosive production enterprises is greatly saved, and the heat preservation safety and reliability of the methylamine nitrate storage tank are improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is the overall structural schematic diagram of the present utility model;
[0015] Figure 2 is the schematic diagram of the heat preservation system for methylamine nitrate reaction under the prior art. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] The following is a detailed description of a preferred embodiment of the present utility model with reference to the drawings.
[0017] As Figure 1 shown, the energy-saving heat preservation system for the preparation of water gel explosive includes: a water storage tank, an air energy unit, a heat recovery circulation unit, and a storage tank heat preservation circulation unit. Specifically:
[0018] The water storage tank is connected to the water inlet device (such as a tap water valve) through a water treatment device.
[0019] The air energy unit includes a plurality of air energy devices and air energy pumps connected to the water storage tank through an inlet pipe and a return pipe. The air energy pump is arranged on the inlet pipe to form an air energy heating circulation pipeline.
[0020] The heat recovery circulation unit includes a heat exchanger, a methylamine nitrate reactor, a cooling coil pipe arranged in the methylamine nitrate reactor, and a cooling tower. The water outlet of the cooling coil pipe is connected to the heat source water inlet of the heat exchanger through a pipeline. The heat source water outlet of the heat exchanger is connected to the water inlet of the cooling tower through a pipeline. The water outlet of the cooling tower is connected to the water inlet of the cooling coil pipe through a pipeline provided with a cold water circulation pump to form a heat source circulation pipeline. The water storage tank is connected to the cold source water inlet of the heat exchanger through a pipeline provided with a heat exchanger pump, and the cold source water outlet of the heat exchanger is connected to the water storage tank to form a cold source circulation pipeline.
[0021] The storage tank heat preservation circulation unit includes a methylamine nitrate storage tank and a heat preservation coil pipe arranged in the methylamine nitrate storage tank; the water outlet of the heat preservation coil pipe is connected to the water storage tank through a heat preservation return water valve, and the water storage tank is sequentially connected to the water inlet of the heat preservation coil pipe through a neutralization hot water pump and a heat preservation inlet water valve; the methylamine nitrate storage tank is connected with a methylamine nitrate circulation pipeline and is connected to the methylamine nitrate reactor through a discharging valve, and a mixed hot water tracing pipe for heat preservation of the methylamine nitrate circulation pipeline is also arranged at the methylamine nitrate circulation pipeline.
[0022] The methylamine nitrate circulation pipeline described in this preferred embodiment includes a methylamine nitrate feed pipe and a methylamine nitrate discharge pipe, and the mixed hot water tracing pipe includes a mixed hot water return pipe arranged at the methylamine nitrate feed pipe and a mixed hot water inlet pipe arranged at the methylamine nitrate discharge pipe; the mixed hot water tracing pipe can heat-preserve the methylamine nitrate circulation pipeline, and the heat source is the heat source of the subsequent process, and the heat source comes from electric energy or natural gas energy.
[0023] The heat preservation inlet water valve described in this preferred embodiment is a double L-shaped four-way electric ball valve, and its four interfaces are respectively connected to the mixed hot water inlet pipe, short-circuited with the heat preservation return water valve, connected to the water outlet of the neutralization hot water pump, and connected to the water inlet of the heat preservation coil pipe. In specific use, the heat preservation inlet water valve includes two working states, A and B. Its working state A is that the mixed hot water inlet pipe is short-circuited with the heat preservation return water valve, and the water outlet of the neutralization hot water pump is communicated with the water inlet of the heat preservation coil pipe; its working state B is that the mixed hot water inlet pipe is communicated with the water inlet of the heat preservation coil pipe, and the water outlet of the neutralization hot water pump is short-circuited with the heat preservation return water valve.
[0024] Similarly, the heat preservation return water valve is a double L-shaped four-way electric ball valve, and its four interfaces are respectively connected to the mixed hot water return pipe, short-circuited with the heat preservation inlet water valve, connected to the water storage tank, and connected to the water outlet of the heat preservation coil pipe. In specific use, the heat preservation return water valve includes two working states, a and b. Its working state a is that the mixed hot water return pipe is short-circuited with the heat preservation inlet water valve, and the water storage tank is communicated with the water outlet of the heat preservation coil pipe; the working state b is that the mixed hot water return pipe is communicated with the water outlet of the heat preservation coil pipe, and the water storage tank is short-circuited with the heat preservation inlet water valve.
[0025] Since the mandatory production time for civil explosive production enterprises is from 6:00 a.m. to 12:00 p.m. at night, most of the reactions in the methylamine nitrate preparation process, that is, in the methylamine nitrate reactor, are completed during the day. Due to the residual heat of the solution during the day's production, the solution in the methylamine nitrate storage tank usually does not need to be insulated through the insulation pipeline during the day's production. At night, however, the solution in the methylamine nitrate storage tank needs to be insulated through the insulation pipeline. Therefore, in the actual production process, the system described in the present utility model can make more full use of the waste heat generated by the reaction in the methylamine nitrate reactor during the day and use the hot water in the water storage pipe to insulate the solution in the methylamine nitrate storage tank at night, saving the energy consumption cost of civil explosive production enterprises.
[0026] At the same time, in the specific production of water gel explosive, the process storage temperature of the methylamine nitrate storage tank is higher than 50°C and strictly lower than 82°C; the energy efficiency ratio of the air source heat pump unit is generally about 4.0, and the heating temperature can reach 50°C - 80°C, and it can work in an environment of -26°C to 46°C; during the reaction of methylamine nitrate, the reaction temperature of the methylamine nitrate reactor is about 80°C, and the outlet water temperature of the cooling coil is higher than 50°C.
[0027] Therefore, the outlet water temperature of the cooling coil in the methylamine nitrate reactor > the heating temperature of the air source heat pump unit > the process storage temperature of the methylamine nitrate storage tank; the upper limit of the process safety temperature of the methylamine nitrate storage tank > the upper limit of the heating temperature of the air source heat pump unit.
[0028] In the specific use, the hot water in the water storage tank goes through two processes, one is the heating process and the other is the insulation process.
[0029] The heating process specifically includes:
[0030] Assume that temperature range A is the working set temperature range of the air source heat pump unit, and temperature range B is the working set temperature range of the heat exchanger and the heat exchanger pump. Temperature range B is higher than temperature range A to fully recover the heat generated by the methylamine nitrate reactor during the day's working hours.
[0031] When the water temperature in the water storage tank does not reach the set temperature range, the air source heat pump unit works, and the circulating pipeline of the water storage tank circulates through the pump body of the air source heat pump unit. The medium water in the water storage tank is heated by the air source heat pump unit. When the water temperature in the water storage tank reaches the set temperature range A, the air source heat pump unit stops working and is in a standby state.
[0032] When the water temperature in the water storage tank does not reach the set temperature range B, when the methylamine nitrate reactor undergoes a neutralization reaction, the cooling tower and the chilled water circulation pump are started, and the cooling water in the cooling coil starts to circulate. It enters the chilled water circulation pump from the outlet of the cooling tower, and after being pressurized by the chilled water circulation pump, it enters the inlet of the cooling coil in the methylamine nitrate reactor. After the cooling water passes through the cooling coil and exchanges heat fully with the inside of the methylamine nitrate reactor, it flows out from the outlet of the cooling coil and enters the heat exchanger. At this time, the cooling water is the heat source water of the heat exchanger, exchanges heat with the cold source water, and then returns to the inlet of the cooling tower, completing the circulation of the cooling circulating water; the medium water in the water storage tank serves as the cold source water of the heat exchanger, and after being pressurized by the heat exchanger pump, it enters the inlet of the cold source of the heat exchanger, exchanges heat and warms up with the heat source water, and then returns to the water storage tank, completing the circulation operation of heating the insulating water. When the water temperature in the water storage tank reaches the set temperature range B, the heat exchanger and the heat exchanger pump do not work.
[0033] In the actual production process, since the temperature of the return water in the cooling coil in the methylamine nitrate reactor does not exceed the set temperature range B, the water storage tank can fully recover the heat generated during the production process of the methylamine nitrate reactor.
[0034] The specific heat preservation process includes:
[0035] When the temperature of the insulating water in the water storage tank meets the insulation requirements of the methylamine nitrate storage tank, both the insulation inlet valve and the insulation return valve are switched to the a state, and the insulating water heated by the steam heat source in the subsequent mixing process is used to supply heat to the methylamine circulation pipeline through the mixed hot water tracing pipe. The insulating water flowing out of the water storage tank is pressurized by the neutralization hot water pump, transported to the insulation inlet valve, and then enters the inlet of the insulation coil in the methylamine nitrate storage tank through the inlet of the insulation coil, and the insulation coil is used to conduct heat preservation heat exchange for the methylamine nitrate solution in the methylamine nitrate storage tank. The heated insulating water passes through the outlet of the insulation coil, returns to the water storage tank through the insulation return valve, and completes the insulation cycle.
[0036] When the temperature of the insulating water in the water storage tank does not meet the insulation requirements of the methylamine nitrate storage tank, both the insulation inlet valve and the insulation return valve are switched to the b state, and the insulating water heated by the steam heat source in the subsequent mixing process is used to supply heat to the methylamine circulation pipeline and the methylamine nitrate storage tank. The insulating water heated by the steam heat source in the subsequent mixing process passes through the mixed hot water inlet pipe, enters the inlet of the insulation coil in the methylamine nitrate storage tank through the insulation inlet valve, and the insulation coil is used to conduct heat preservation heat exchange for the methylamine nitrate solution in the methylamine nitrate storage tank. The heated insulating water passes through the outlet of the insulation coil, returns to the mixed hot water return pipe through the insulation return valve, and completes the insulation cycle. The insulating water in the water storage tank continues to be heated by the air source heat pump unit and the heat exchanger.
[0037] The utility model performs insulation work through two sets of heating systems, namely, a neutralization energy-saving system and a mixed hot water accompanying pipe. During the day, the waste heat generated by the reaction in the methylamine nitrate reactor can be fully collected, and the hot water in the water storage pipe can be used to insulate the solution in the methylamine nitrate storage tank at night. Through the application of air energy equipment and waste heat recovery, the energy consumption cost of civil explosive production enterprises is greatly saved, and the insulation safety and reliability of the methylamine nitrate storage tank are improved.
[0038] The above-described embodiments are merely descriptions of preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.
Claims
1. An energy-saving and heat-insulating system for preparing water-gel explosives, characterized in that: include: A water storage tank, wherein the water storage tank is connected to the water inlet equipment through a water treatment device; The air energy unit comprises a plurality of air energy devices and an air energy pump connected to a water storage tank through a water inlet pipe and a water return pipe, wherein the air energy pump is arranged on the water inlet pipe to form an air energy heating circulation pipeline; A heat recovery cycle unit includes a heat exchanger, a methylamine nitrate reactor, a cooling coil arranged in the methylamine nitrate reactor, and a cooling tower; The water outlet of the cooling coil is connected to the heat source water inlet of the heat exchanger through a pipeline, the heat source water outlet of the heat exchanger is connected to the water inlet of the cooling tower through a pipeline, and the water outlet of the cooling tower is connected to the water inlet of the cooling coil through a pipeline provided with a cold water circulation pump to form a heat source circulation pipeline; The water storage tank is connected to the cold source water inlet of the heat exchanger through a pipeline provided with a heat exchanger pump, and the cold source water outlet of the heat exchanger is connected to the water storage tank to form a cold source circulation pipeline; A storage tank insulation circulation unit, comprising a methylamine nitrate storage tank and an insulation coil arranged in the methylamine nitrate storage tank; The water outlet of the insulation coil is connected to the water storage tank through the insulation return valve, and the water storage tank is connected to the water inlet of the insulation coil through the neutralization hot water pump and the insulation water inlet valve in turn; The methylamine nitrate storage tank is connected to a methylamine nitrate circulation pipeline and is connected to the methylamine nitrate reactor through a discharge valve. A mixed hot water companion pipe for heat preservation of the methylamine nitrate circulation pipeline is also arranged at the methylamine nitrate circulation pipeline.
2. An energy-saving and heat-insulating system for preparing water-gel explosives according to claim 1, characterized in that: The methylamine nitrate circulation pipeline comprises a methylamine nitrate feed pipe and a methylamine nitrate discharge pipe, and the mixed hot water companion pipe comprises a mixed hot water return pipe arranged at the methylamine nitrate feed pipe and a mixed hot water inlet pipe arranged at the methylamine nitrate discharge pipe.
3. An energy-saving and heat-insulating system for preparing water-gel explosives according to claim 2, characterized in that: The insulated water inlet valve is a double L-shaped four-way electric ball valve, and its four interfaces are respectively connected to the mixed hot water inlet pipe, short-circuited with the insulated return valve, connected to the outlet of the neutralizing hot water pump, and connected to the water inlet of the insulated coil.
4. An energy-saving and heat-insulating system for preparing water-gel explosives according to claim 3, characterized in that: The insulated water inlet valve includes two working states, A and B. The working state A is that the mixed hot water inlet pipe is short-circuited with the insulated return water valve, and the water outlet of the neutralization hot water pump is connected with the water inlet of the insulation coil; the working state B is that the mixed hot water inlet pipe is connected with the water inlet of the insulation coil, and the water outlet of the neutralization hot water pump is short-circuited with the insulation return water valve.
5. The energy-saving and heat-insulating system for preparing water-gel explosive according to claim 2, characterized in that: The insulated return valve is a double L-shaped four-way electric ball valve, and its four interfaces are respectively connected to the mixed hot water return pipe, short-circuited with the insulated inlet valve, connected to the water storage tank, and connected to the water outlet of the insulated coil.
6. An energy-saving and heat-insulating system for preparing water-gel explosives according to claim 5, characterized in that: The insulated return valve includes two working states, a and b. The working state a is that the mixed hot water return pipe is short-circuited with the insulated water inlet valve, and the water storage tank is connected with the water outlet of the insulated coil; the working state b is that the mixed hot water return pipe is connected with the water outlet of the insulated coil, and the water storage tank is short-circuited with the insulated water inlet valve.