Unsymmetrical dimethylhydrazine gas-liquid separation heat exchange equipment

Abstract

The utility model belongs to the technical field of unsymmetrical dimethylhydrazine production equipment, and particularly relates to unsymmetrical dimethylhydrazine gas-liquid separation heat exchange equipment which comprises a reaction kettle, two heat exchange pipes are sequentially arranged outside the reaction kettle from top to bottom, and each heat exchange pipe is of a structure with a plurality of bent hooks arranged side by side. A waste water inlet pipe fixedly communicated with the reaction kettle is inserted between the two heat exchange pipes, vacuum heat insulation plates detachably connected with the two heat exchange pipes are installed on the two sides of the waste water inlet pipe, an air outlet pipe is fixedly communicated with the upper surface of the reaction kettle, and one end of the air outlet pipe extends downwards and penetrates through a bent hook side-by-side structure of one heat exchange pipe; the lower surface of the reaction kettle is fixedly communicated with a draft tube, one end of the draft tube extends downwards and penetrates through the hook side-by-side structure of the other heat exchange tube, and a plurality of annular heating tubes are fixed on the outer side of the reaction kettle. According to the utility model, two strands of heat-conducting oil for heat exchange can be blocked, and the heat exchange between unsymmetrical dimethylhydrazine airflow and tail gas is reduced, so that the heat exchange isolation degree of two products separated from wastewater is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of unsymmetrical dimethylhydrazine production equipment, and specifically relates to an unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange equipment. Background Art

[0002] Unsymmetrical dimethylhydrazine (UDMH) is widely used in the military and civilian aerospace industries. It is a liquid fuel with high specific impulse, high heat of combustion, and high density impulse. In its mainstream production process, the spent alkali is typically treated directly by neutralization in the wastewater system. This method not only consumes large amounts of acid for neutralization but also produces a large amount of industrial salt. The treatment process is also energy-intensive and cannot effectively quench the small amount of hydrazine produced in the discharged wastewater, resulting in significant environmental pressure and operating costs.

[0003] Unsymmetrical dimethylhydrazine is miscible with water. Direct treatment of wastewater generated during production consumes a lot of energy and results in some loss, leading to waste. Using a reactor to fractionate the wastewater is primarily due to the fact that unsymmetrical dimethylhydrazine has a lower boiling point at atmospheric pressure than water, allowing it to evaporate after heating in the reactor.

[0004] During the fractionation of unsymmetrical dimethylhydrazine in the reactor, it is separated from the water vapor and liquid, and two heat exchange tubes are used to recover the heat of the tail water and the unsymmetrical dimethylhydrazine gas flow respectively. The recovered heat can be used to heat the wastewater. However, the two heat exchange tubes are attached to the liquid inlet pipe of the reactor and inevitably contact each other. Due to the different pumping flow rates, there is often a temperature difference between the two, which causes heat transfer between the two heat exchange tubes, resulting in poor heat exchange isolation between the two products of wastewater separation. For this reason, we propose an unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange equipment. Utility Model Content

[0005] The purpose of this utility model is to provide a UDMH gas-liquid separation heat exchange equipment, which can block two streams of heat transfer oil used for heat exchange, reduce the heat exchange between the UDMH gas flow and the tail gas, and improve the isolation degree of heat exchange between the two products of wastewater separation.

[0006] The technical solutions adopted in this application are as follows:

[0007] A heat exchange device for separating unsymmetrical dimethylhydrazine from gas and liquid, comprising a reactor, wherein two heat exchange tubes are sequentially arranged on the outside of the reactor from top to bottom, and the two heat exchange tubes are both in a structure of several hooks arranged side by side. A wastewater inlet pipe fixedly connected to the reactor is inserted between the two heat exchange tubes, and vacuum insulation panels detachably connected to the two heat exchange tubes are installed on both sides of the wastewater inlet pipe. An air outlet pipe is fixedly connected to the upper surface of the reactor, and one end of the air outlet pipe extends downward and passes through the hook-arranged structure of one heat exchange tube. A tailwater pipe is fixedly connected to the lower surface of the reactor, and one end of the tailwater pipe extends downward and passes through the hook-arranged structure of another heat exchange tube. When treating unsymmetrical dimethylhydrazine wastewater, the wastewater is continuously fed into the reactor along the wastewater inlet pipe, and is continuously heated. During the process, since the boiling point of unsymmetrical dimethylhydrazine is 63.9°C, the unsymmetrical dimethylhydrazine in the wastewater evaporates in the reactor to form a gas and is discharged along the outlet pipe, while the remaining tail water is continuously discharged from the bottom of the reactor along the tail water pipe. At the same time, the high-temperature resistant oil pump actuates the circulation of the heat transfer oil in the two heat exchange tubes, first absorbing the heat of the unsymmetrical dimethylhydrazine airflow in the outlet pipe and the heat of the tail gas in the tail water pipe, and then uses the heat transfer oil to transfer it to the wastewater in the wastewater inlet pipe. This heat exchange method can recover the waste heat in the wastewater treatment process. In this heat exchange process, two vacuum insulation panels are used to separate the two heat exchange tubes on both sides of the wastewater inlet pipe, which can block the two streams of heat transfer oil used for heat exchange, reduce the heat exchange between the unsymmetrical dimethylhydrazine airflow and the tail gas, and improve the isolation degree of heat exchange between the two products of wastewater separation.

[0008] A plurality of annular heating pipes are fixed on the outside of the reactor. The heating pipes can be connected to a distribution box controlled by an industrial computer so as to be powered, thereby heating the wastewater on the outside of the reactor in a feasible manner.

[0009] The outer sleeve of one of the heat exchange tubes is provided with an upper insulation shell which is detachably connected to the two vacuum insulation panels. The upper insulation shell is arranged on the outside of the outlet pipe. Rock wool can be fixed on the inner wall of the upper insulation shell. The two vacuum insulation panels are used to surround the heat exchange tube and the wastewater inlet pipe to reduce the heat exchange between the heat transfer oil and the air.

[0010] The outer sleeve of the other heat exchange tube is provided with a lower insulation shell which is detachably connected to the two vacuum insulation panels. The lower insulation shell is arranged on the outside of the tail water pipe and cooperates with the two vacuum insulation panels to surround the heat exchange tube, wastewater inlet pipe and tail water pipe to reduce the heat exchange between the heat transfer oil and the air.

[0011] The two corners of the two vacuum insulation panels that are close to each other are fixed with flange plates, and the four flange plates extend out of the interior of the upper insulation shell and the lower insulation shell respectively, increasing the connection area between the two vacuum insulation panels and the wastewater inlet pipe and improving the reliability of their fixation.

[0012] The outer parts of the two adjacent flange plates are both sleeved with clamps, which respectively bind the two flange plates and the vacuum insulation panel from both sides. The flange plates and the vacuum insulation panel can be quickly disassembled by loosening the nuts on the two clamps.

[0013] The technical effects achieved by this utility model are:

[0014] The utility model discloses a hydrazine gas-liquid separation heat exchange equipment. When treating hydrazine wastewater, the wastewater is continuously fed into a reactor along a wastewater inlet pipe. During the continuous heating process, since the boiling point of hydrazine is 63.9°C, the hydrazine in the wastewater evaporates in the reactor to form a gaseous state and is discharged along the air outlet pipe, while the remaining tail water is continuously discharged from the bottom of the reactor along the tail water pipe. At the same time, a high-temperature resistant oil pump actuates the heat transfer oil of the two heat exchange pipes to circulate, first absorbing the heat of the hydrazine airflow in the air outlet pipe and the heat of the tail gas in the tail water pipe respectively, and then using the heat transfer oil to transfer to the wastewater in the wastewater inlet pipe. Such a heat exchange method can recover the waste heat in the wastewater treatment process. In the heat exchange process, two vacuum insulation panels are used to separate the two heat exchange pipes on both sides of the wastewater inlet pipe, which can block the two heat transfer oils used for heat exchange, reduce the heat exchange between the hydrazine airflow and the tail gas, and improve the isolation degree of heat exchange between the two products of wastewater separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a main view of a practical unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange equipment;

[0016] Figure 2 This is a partial cross-sectional view of a practical unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange equipment;

[0017] Figure 3 This is the main view of the heat exchange tube of this utility model;

[0018] Figure 4 It is a front view of two vacuum insulation panels of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0020] 1. Reactor; 2. Heat exchange tube; 3. Wastewater inlet pipe; 4. Vacuum insulation panel; 5. Exhaust pipe; 6. Tailwater pipe; 7. Heating pipe; 8. Upper insulation shell; 9. Lower insulation shell; 10. Flange plate; 11. Clamp. DETAILED DESCRIPTION

[0021] In order to make the purpose and advantages of this utility more clear, the utility is described in detail below with reference to the embodiments. It should be understood that the following text is only used to describe one or several specific implementation methods of this utility and does not strictly limit the scope of protection specifically requested by this utility.

[0022] like Figure 1-4As shown, a unidirectional dimethylhydrazine gas-liquid separation heat exchange equipment includes a reactor 1. Two heat exchange tubes 2 are arranged on the outside of the reactor 1 in sequence from top to bottom. The two heat exchange tubes 2 form a closed heat transfer oil loop and are equipped with a high-temperature resistant oil pump. This technical solution is convenient for those skilled in the art to implement through common sense. The two heat exchange tubes 2 are both in a structure of several curved hooks arranged side by side. A wastewater inlet pipe 3 fixedly connected to the reactor 1 is inserted in the middle of the two heat exchange tubes 2. Both sides of the wastewater inlet pipe 3 are equipped with two heat exchangers. The vacuum insulation panel 4 with detachable connection to the tubes 2 can be connected with bolts for detachable connection. By unscrewing the bolts along the thread in the forward direction, the two heat exchange tubes 2 and the vacuum insulation panel 4 can be separated. Conversely, by screwing on the bolts in the reverse direction, the two heat exchange tubes 2 and the vacuum insulation panel 4 can be fixed. The disassembly and assembly are convenient. The upper surface of the reactor 1 is fixedly connected with an outlet pipe 5. One end of the outlet pipe 5 extends downward and passes through the hook-parallel structure of a heat exchange tube 2. The lower surface of the reactor 1 is fixedly connected with a tail water pipe 6. One end of the tail water pipe 6 extends downward and passes through the other A heat exchange tube 2 has a hook-shaped side-by-side structure, and the reactor 1 is placed on the ground and continuously heated from the outside to above 70°C. When treating unsymmetrical dimethylhydrazine wastewater, the wastewater is continuously fed into the reactor 1 along the wastewater inlet pipe 3. During the continuous heating process, since the boiling point of unsymmetrical dimethylhydrazine is 63.9°C, the unsymmetrical dimethylhydrazine in the wastewater evaporates in the reactor 1 to form a gaseous state and is discharged along the outlet pipe 5, while the remaining tail water is continuously discharged from the bottom of the reactor 1 along the tail water pipe 6. At the same time, the high-temperature resistant oil pump agitates the heat transfer oil circulation of the two heat exchange tubes 2 Flow, first absorb the heat of the unsymmetrical dimethylhydrazine airflow in the outlet pipe 5 and the heat of the tail gas in the tail water pipe 6, and transfer it to the wastewater in the wastewater inlet pipe 3 using the heat transfer oil. This heat exchange method can recover the waste heat in the wastewater treatment process. In this heat exchange process, two vacuum insulation panels 4 are used to separate the two heat exchange tubes 2 on both sides of the wastewater inlet pipe 3, which can block the two streams of heat transfer oil used for heat exchange, reduce the heat exchange between the unsymmetrical dimethylhydrazine airflow and the tail gas, and improve the isolation degree of heat exchange between the two products of wastewater separation.

[0023] Among them, the heating temperature of the reactor 1 can be increased to above 100°C to facilitate the rapid heating and evaporation of unsymmetrical dimethylhydrazine in the wastewater. Of course, the heating temperature is best controlled below 240°C to prevent it from approaching the ignition point of unsymmetrical dimethylhydrazine; and for the two heat exchange tubes 2, their upper and lower surfaces are curved, which can be as close to the curved surfaces of the wastewater inlet pipe 3, the outlet pipe 5 and the tail water pipe 6 as possible to increase the heat conduction area.

[0024] like Figure 1 and Figure 3 As shown, a plurality of annular heating tubes 7 are fixed on the outside of the reactor 1. The heating tubes 7 can be connected to a distribution box controlled by an industrial computer so as to be powered, thereby heating the wastewater on the outside of the reactor 1 using a feasible means.

[0025] like Figure 1 and Figure 2As shown, a heat exchange tube 2 is sheathed with an upper insulation shell 8 which is detachably connected to two vacuum insulation panels 4. The upper insulation shell 8 is sheathed on the outside of the air outlet pipe 5. Rock wool can be fixed on the inner wall of the upper insulation shell 8. The two vacuum insulation panels 4 are used to surround the heat exchange tube 2, the wastewater inlet pipe 3 and the air outlet pipe 5 to reduce the heat exchange between the heat transfer oil and the air.

[0026] like Figure 1 and Figure 2 As shown, the outer sleeve of the other heat exchange tube 2 is provided with a lower insulation shell 9 which is detachably connected to the two vacuum insulation panels 4. Rock wool can be fixed on the inner wall of the lower insulation shell 9. The lower insulation shell 9 is sleeved on the outside of the tail water pipe 6 and cooperates with the two vacuum insulation panels 4 to surround the heat exchange tube 2, the wastewater inlet pipe 3 and the tail water pipe 6 to reduce the heat exchange between the heat transfer oil and the air.

[0027] like Figure 2 and Figure 4 As shown, flange plates 10 are fixed to the two corners of the two vacuum insulation panels 4 that are close to each other. The four flange plates 10 extend out of the interior of the upper insulation shell 8 and the interior of the lower insulation shell 9, respectively, increasing the connection area between the two vacuum insulation panels 4 and the wastewater inlet pipe 3 and improving the reliability of their fixation.

[0028] like Figure 2 and Figure 4 As shown, two adjacent flange plates 10 are both sleeved with clamps 11 on their exteriors. The two flange plates 10 and the vacuum insulation panel 4 are respectively bound from both sides by the two clamps 11 . The flange plates 10 and the vacuum insulation panel 4 can be quickly disassembled by loosening the nuts on the two clamps 11 .

[0029] The working principle of this utility model is as follows: when treating unsymmetrical dimethylhydrazine wastewater, the wastewater is continuously fed into the reactor 1 along the wastewater inlet pipe 3. During the continuous heating process, since the boiling point of unsymmetrical dimethylhydrazine is 63.9°C, the unsymmetrical dimethylhydrazine in the wastewater evaporates in the reactor 1 to form a gaseous state and is discharged along the outlet pipe 5, while the remaining tail water is continuously discharged from the bottom of the reactor 1 along the tail water pipe 6.

[0030] At the same time, the high-temperature resistant oil pump drives the heat transfer oil in the two heat exchange tubes 2 to circulate, first absorbing the heat of the unsymmetrical dimethylhydrazine airflow in the outlet pipe 5 and the heat of the tail gas in the tail water pipe 6, and then uses the heat transfer oil to transfer the wastewater in the wastewater inlet pipe 3. This heat exchange method can recover the waste heat in the wastewater treatment process.

[0031] During the heat exchange process, two vacuum insulation panels 4 are used to separate the two heat exchange tubes 2 on both sides of the wastewater inlet pipe 3, which can block the two streams of heat transfer oil used for heat exchange, reduce the heat exchange between the unsymmetrical dimethylhydrazine airflow and the tail gas, and thus improve the isolation degree of heat exchange between the two products of wastewater separation.

[0032] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this application shall be implemented in accordance with conventional means in the art unless otherwise specified or limited.

Claims

1. An unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange device, comprising a reactor (1), characterized in that: The reactor (1) is provided with two heat exchange tubes (2) in sequence from top to bottom on the outside. Both of the heat exchange tubes (2) are in a structure of several hooks arranged side by side. A wastewater inlet pipe (3) fixedly connected to the reactor (1) is inserted between the two heat exchange tubes (2). Both sides of the wastewater inlet pipe (3) are installed with vacuum insulation panels (4) detachably connected to the two heat exchange tubes (2). The upper surface of the reactor (1) is fixedly connected to an air outlet pipe (5). One end of the air outlet pipe (5) extends downward and passes through the hook-arranged structure of one heat exchange tube (2). The lower surface of the reactor (1) is fixedly connected to a tailwater pipe (6). One end of the tailwater pipe (6) extends downward and passes through the hook-arranged structure of another heat exchange tube (2).

2. The unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange equipment according to claim 1, characterized in that: A plurality of annular heating tubes (7) are fixed on the outside of the reaction kettle (1).

3. The unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange equipment according to claim 1, characterized in that: An upper insulation shell (8) which is detachably connected to two vacuum insulation panels (4) is provided on the outside of the heat exchange tube (2), and the upper insulation shell (8) is provided on the outside of the air outlet pipe (5).

4. The unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange equipment according to claim 3, characterized in that: The outer portion of the other heat exchange tube (2) is sheathed with a lower insulation shell (9) that is detachably connected to the two vacuum insulation panels (4), and the lower insulation shell (9) is sheathed on the outer portion of the tailwater pipe (6).

5. The unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange equipment according to claim 4, characterized in that: Flange plates (10) are fixed to two mutually adjacent corners of the two vacuum insulation panels (4), and the four flange plates (10) extend out of the interior of the upper insulation shell (8) and the interior of the lower insulation shell (9), respectively.

6. The unsymmetrical dimethylhydrazine gas-liquid separation and heat exchange equipment according to claim 5, characterized in that: The exteriors of the two adjacent flange plates (10) are both sleeved with clamps (11).

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