Automatic preparation system of washing liquid for nitrotoluene production

Abstract

The invention discloses an automatic cleaning solution preparation system for nitrotoluene production, which comprises a static mixer, two input ends of the static mixer are communicated with check valves, the input ends of the check valves are communicated with metering pumps, the input end of one metering pump is communicated with a concentrated alkali tank, and the input end of the other metering pump is communicated with a concentrated alkali tank. The input end of the other metering pump is communicated and connected with a soft water head tank; the metering pump is used for conveying materials, the static mixer is used for preparing dilute alkali, the online alkali concentration meter is used for detecting the concentration of the dilute alkali, the liquid level meter is used for detecting the liquid level of the dilute alkali, and the control cabinet is used for automatically controlling the material flow, so that manual alkali preparation is replaced, and the device has the advantages of being high in automation degree, easy to operate and capable of saving manpower; the static mixer generates rotational flow through the liquid mixing cavity, primary liquid mixing is achieved in combination with the liquid mixing rod, high-speed rotational flow is generated through the fluid director, secondary liquid mixing is achieved in combination with the liquid mixing plate, the good liquid mixing effect is achieved under the small equipment size, and the static mixer is more practical compared with an existing static mixer.

Description

Technical Field

[0001] The invention relates to the technical field of chemical industry, and in particular to an automatic configuration system of washing liquid for nitrotoluene production. Background Art

[0002] In the production process of mononitrotoluene, alkali washing is required. The existing alkali solution preparation process is generally manually operated on site, that is, soft water and concentrated alkali are mixed manually to prepare the required concentration of dilute alkali. Due to the low degree of automation and complex process, the labor intensity of personnel is relatively high, so the existing alkali preparation method can no longer meet the production needs; and some technologies use static mixers as mixing equipment for soft water and concentrated alkali, but this type of static mixer mostly uses spiral blades, which have a general mixing effect on the fluid. Therefore, in order to extend the mixing time, the length of the static mixer is designed to be relatively long, which also makes the equipment larger and occupies more space, resulting in limited use places. Summary of the invention

[0003] The object of the present invention is to provide an automatic dispensing system for washing liquid for nitrotoluene production, so as to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an automatic configuration system for washing liquid for nitrotoluene production, comprising a static mixer, wherein both input ends of the static mixer are conductively connected to a check valve, the input end of the check valve is conductively connected to a metering pump, the input end of one of the metering pumps is conductively connected to a concentrated alkali tank, the input end of the other metering pump is conductively connected to a soft water high-level tank, and the output end of the static mixer is conductively connected to a dilute alkali high-level tank.

[0005] As a preferred technical solution, a liquid level meter is fixedly connected to the diluted alkali high-level tank, the liquid level meter is electrically connected to a control cabinet, and the control cabinet is electrically connected to a metering pump, the control cabinet is electrically connected to an online alkali concentration meter, and the online alkali concentration meter is installed at the output end of the static mixer.

[0006] As a preferred technical solution, both the output end of the dilute alkali high-level tank and the input end of the concentrated alkali tank are connected and fixed with regulating valves.

[0007] As a preferred technical solution, the static mixer includes a shell, a mixing chamber, a liquid inlet pipe, a first flange, a bottom plate, a fixed seat, a mixing rod, a top cover, a mixing pipe, a limit ring, a second flange, a guide, a first guide groove, a fixed rod, a first mixing plate, a second guide groove, a second mixing plate, a third guide groove, a third flange, a liquid outlet pipe and a fourth flange. A mixing chamber is opened in the shell, and the mixing chamber is conductively connected to two liquid inlet pipes, and one end of the liquid inlet pipe is conductively fixed in the tangential direction of the shell, and the other end of the liquid inlet pipe is conductively fixed to the output end of the metering pump. The lower surface of the shell is fixedly connected to the bottom plate, and the bottom plate is fixedly connected to the fixed seat. A plurality of mixing rods are evenly distributed on the fixed seat, and the mixing rods are arranged in the mixing chamber.

[0008] As a preferred technical solution, a top cover is fixedly connected to the upper surface of the shell, a mixing tube is fixed on the top cover, a flow guide is arranged in the mixing tube, a plurality of first flow guide grooves are evenly distributed on the flow guide, a fixed rod is fixedly connected to the upper surface of the flow guide, a plurality of first mixing plates and second mixing plates are evenly distributed on the fixed rod, and the first mixing plates and the second mixing plates are spaced apart, a plurality of second flow guide grooves are evenly distributed on the first mixing plate, and a plurality of third flow guide grooves are evenly distributed on the second mixing plate.

[0009] As a preferred technical solution, a limiting ring is fixedly connected inside the mixing tube, and the limiting ring is arranged at the bottom end of the guide device.

[0010] As a preferred technical solution, the two liquid inlet pipes are fixedly connected with a first flange, the top of the mixing pipe is fixedly connected with a second flange, the second flange is fixedly connected with a third flange, the third flange is fixedly connected with a liquid outlet pipe, and the top of the liquid outlet pipe is fixedly connected with a fourth flange.

[0011] The invention provides an automatic dispensing system for washing liquid for nitrotoluene production, which has the advantages that: the invention uses a metering pump to transport materials, adopts a static mixer to prepare dilute alkali, detects the dilute alkali concentration by an online alkali concentration meter, detects the dilute alkali liquid level by a liquid level meter, and realizes automatic control of the material flow by a control cabinet, thereby replacing manual alkali preparation, and has the advantages of high automation, simple operation, and labor saving; and the static mixer uses a mixing chamber to generate a swirl, combines a mixing rod to achieve primary mixing, uses a guide to generate a high-speed swirl, and combines a mixing plate to achieve secondary mixing, thereby achieving a good mixing effect with a smaller equipment volume, and is more practical than the existing static mixer. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is the overall structural diagram of the present invention;

[0014] Figure 2 It is a schematic diagram of the three-dimensional structure of the static mixer of the present invention;

[0015] Figure 3 It is an exploded view of the three-dimensional structure of the static mixer of the present invention;

[0016] Figure 4 for Figure 3 A magnified view of the structure in the middle A area;

[0017] Figure 5 It is a schematic diagram of the three-dimensional cross-section structure of the liquid mixing tube of the present invention.

[0018] In the figure: 1. static mixer; 11. shell; 12. mixing chamber; 13. liquid inlet pipe; 14. first flange; 15. bottom plate; 16. fixed seat; 17. mixing rod; 18. top cover; 19. mixing pipe; 110. limit ring; 111. second flange; 112. deflector; 113. first guide groove; 114. fixed rod; 115. first mixing plate; 116. second guide groove; 117. second mixing plate; 118. third guide groove; 119. third flange; 120. liquid outlet pipe; 121. fourth flange; 2. check valve; 3. metering pump; 4. concentrated alkali tank; 5. soft water high-level tank; 6. online alkali concentration meter; 7. dilute alkali high-level tank; 8. liquid level meter; 9. control cabinet; 10. regulating valve. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Please see attached Figure 1 -Attached Figure 5An embodiment of the present invention is: an automatic configuration system for washing liquid for nitrotoluene production, comprising a static mixer 1, wherein both input ends of the static mixer 1 are conductively connected with a check valve 2, the input end of the check valve 2 is conductively connected with a metering pump 3, the input end of one metering pump 3 is conductively connected with a concentrated alkali tank 4, the input end of the other metering pump 3 is conductively connected with a soft water high-level tank 5, the output end of the static mixer 1 is conductively connected with a dilute alkali high-level tank 7, the static mixer 1 is used for liquid mixing, the check valve 2 is used for preventing liquid backflow, the metering pump 3 is used for providing power for liquid transportation, the concentrated alkali tank 4 is used for storing concentrated alkali, the soft water high-level tank 5 is used for storing soft water, and the dilute alkali high-level tank 7 is used for storing dilute alkali.

[0021] A liquid level meter 8 is fixedly connected to the dilute alkali high-level tank 7, and the liquid level meter 8 is electrically connected to a control cabinet 9, and the control cabinet 9 is electrically connected to the metering pump 3, and the control cabinet 9 is electrically connected to an online alkali concentration meter 6, and the online alkali concentration meter 6 is installed at the output end of the static mixer 1, the liquid level meter 8 is used to detect the dilute alkali liquid level, and the online alkali concentration meter 6 is used to detect the dilute liquid concentration; the output end of the dilute alkali high-level tank 7 and the input end of the concentrated alkali tank 4 are both connected and fixed with a regulating valve 10, the regulating valve 10 on the concentrated alkali tank 4 is used to control the concentrated alkali input, and the regulating valve 10 on the dilute alkali high-level tank 7 is used to control the dilute alkali output.

[0022] The static mixer 1 includes a shell 11, a liquid mixing chamber 12, a liquid inlet pipe 13, a first flange 14, a bottom plate 15, a fixing seat 16, a liquid mixing rod 17, a top cover 18, a liquid mixing pipe 19, a limiting ring 110, a second flange 111, a guide 112, a first guide groove 113, a fixing rod 114, a first liquid mixing plate 115, a second guide groove 116, a second liquid mixing plate 117, a third guide groove 118, a third flange 119, a liquid outlet pipe 120 and a fourth flange 121. A liquid mixing chamber 12 is provided in the shell 11, and the liquid mixing chamber 12 is connected to two liquid inlet pipes 13, and the inlet pipe 120 is connected to the first liquid mixing chamber 12. One end of the liquid pipe 13 is connected and fixed in the tangential direction of the shell 11, and the other end of the liquid inlet pipe 13 is connected and fixed to the output end of the metering pump 3. A bottom plate 15 is fixedly connected to the lower surface of the shell 11, and a fixing seat 16 is fixedly connected to the bottom plate 15. A plurality of mixing rods 17 are evenly distributed on the fixing seat 16, and the mixing rods 17 are arranged in the mixing chamber 12. The mixing chamber 12 is used to provide a place for initial mixing of liquids. The two liquid inlet pipes 13 are respectively used to input soft water and concentrated alkali. The bottom plate 15 is used to seal the bottom of the shell 11, and the fixing seat 16 is used to install the mixing rod 17, and the mixing rod 17 is used to mix liquids.

[0023] The upper surface of the housing 11 is fixedly connected to a top cover 18, a mixing liquid pipe 19 is connected and fixed to the top cover 18, a flow guide 112 is arranged in the mixing liquid pipe 19, a plurality of first flow guide grooves 113 are evenly distributed on the flow guide 112, a fixing rod 114 is fixedly connected to the upper surface of the flow guide 112, a plurality of first mixing liquid plates 115 and second mixing liquid plates 117 are evenly distributed on the fixing rod 114, and the first mixing liquid plates 115 and the second mixing liquid plates 117 are arranged at intervals, and the first mixing liquid plates 115 are evenly distributed on the first mixing liquid plates 115. A plurality of second guide grooves 116 are arranged, a plurality of third guide grooves 118 are evenly arranged on the second mixing plate 117, the top cover 18 is used to close the top of the shell 11, the mixing pipe 19 is used to provide a place for secondary mixing, the deflector 112 is used to generate swirl, and the fixing rod 114 is used to install the first mixing plate 115 and the second mixing plate 117. The first mixing plate 115 and the second mixing plate 117 realize secondary mixing through the second guide grooves 116 and the third guide grooves 118 respectively.

[0024] A limiting ring 110 is fixedly connected inside the mixing liquid pipe 19, and the limiting ring 110 is arranged at the bottom end of the guide device 112, and the limiting ring 110 is used to support the guide device 112; the two liquid inlet pipes 13 are fixedly connected with the first flange 14, the top of the mixing liquid pipe 19 is fixedly connected with the second flange 111, the second flange 111 is fixedly connected with the third flange 119, the third flange 119 is fixedly connected with the liquid outlet pipe 120, and the top of the liquid outlet pipe 120 is fixedly connected with the fourth flange 121, and the first flange 14, the second flange 111, the third flange 119 and the fourth flange 121 are used to realize the flange connection between the components.

[0025] Working principle: When the present invention is used, concentrated alkali enters concentrated alkali tank 4 through regulating valve 10, and then enters static mixer 1 through metering pump 3 and check valve 2. Soft water in soft water high level tank 5 enters static mixer 1 through another group of metering pumps 3 and check valve 2. Soft water and concentrated alkali enter mixed liquid chamber 12 along the tangent direction of shell 11 through liquid inlet pipe 13. The soft water and concentrated alkali are mixed for the first time by mixing rod 17 on fixed seat 16, and then enter first guide groove 113 on guide device 112, generate vortex in mixed liquid pipe 19, and then pass through first mixing plate 115 and second mixing plate 117 on fixed rod 114 for secondary mixing, and then output through liquid outlet pipe 120, enter diluted alkali high level tank 7 after being detected by online alkali concentration meter 6, control cabinet 9 automatically adjusts concentrated alkali and soft water flow through metering pump 3 according to diluted alkali concentration monitored online, and when diluted alkali liquid level detected by liquid level meter 8 reaches required capacity, control cabinet 9 controls metering pump 3 to close.

[0026] Among them, the first guide groove 113 is narrow at the top and wide at the bottom, the second guide groove 116 and the third guide groove 118 have opposite guiding directions to ensure sufficient mixing, the bottom plate 15 is used to close the bottom of the shell 11, the top cover 18 is used to close the top of the shell 11, the limiting ring 110 is used to support the deflector 112, and the first flange 14, the second flange 111, the third flange 119 and the fourth flange 121 are used to realize flange connection between components.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for automatically dispensing washing liquid for nitrotoluene production, comprising a static mixer (1), characterized in that: Both input ends of the static mixer (1) are conductively connected to a check valve (2), the input end of the check valve (2) is conductively connected to a metering pump (3), the input end of one metering pump (3) is conductively connected to a concentrated alkali tank (4), the input end of the other metering pump (3) is conductively connected to a soft water high-level tank (5), and the output end of the static mixer (1) is conductively connected to a diluted alkali high-level tank (7).

2. The automatic dispensing system for washing liquid for nitrotoluene production according to claim 1, characterized in that: The diluted alkali high-level tank (7) is fixedly connected to a liquid level meter (8), the liquid level meter (8) is electrically connected to a control cabinet (9), and the control cabinet (9) is electrically connected to a metering pump (3), the control cabinet (9) is electrically connected to an online alkali concentration meter (6), and the online alkali concentration meter (6) is installed at the output end of the static mixer (1).

3. The automatic dispensing system for washing liquid for nitrotoluene production according to claim 1, characterized in that: The output end of the diluted alkali high-level tank (7) and the input end of the concentrated alkali tank (4) are both connected and fixed with a regulating valve (10).

4. The automatic dispensing system for washing liquid for nitrotoluene production according to claim 2, characterized in that: The static mixer (1) comprises a housing (11), a liquid mixing chamber (12), a liquid inlet pipe (13), a first flange (14), a bottom plate (15), a fixing seat (16), a liquid mixing rod (17), a top cover (18), a liquid mixing pipe (19), a limiting ring (110), a second flange (111), a flow guide (112), a first flow guide groove (113), a fixing rod (114), a first liquid mixing plate (115), a second flow guide groove (116), a second liquid mixing plate (117), a third flow guide groove (118), a third flange (119), a liquid outlet pipe (12 0) and a fourth flange (121), a liquid mixing chamber (12) is provided in the shell (11), the liquid mixing chamber (12) is conductively connected to two liquid inlet pipes (13), one end of the liquid inlet pipe (13) is conductively fixed to the tangent direction of the shell (11), and the other end of the liquid inlet pipe (13) is conductively fixed to the output end of the metering pump (3), a bottom plate (15) is fixedly connected to the lower surface of the shell (11), a fixing seat (16) is fixedly connected to the bottom plate (15), a plurality of liquid mixing rods (17) are evenly distributed on the fixing seat (16), and the liquid mixing rods (17) are arranged in the liquid mixing chamber (12).

5. The automatic dispensing system for washing liquid for nitrotoluene production according to claim 4, characterized in that: The upper surface of the shell (11) is fixedly connected to a top cover (18), a liquid mixing tube (19) is connected and fixed to the top cover (18), a flow guide (112) is arranged in the liquid mixing tube (19), a plurality of first flow guide grooves (113) are evenly distributed on the flow guide (112), a fixed rod (114) is fixedly connected to the upper surface of the flow guide (112), a plurality of first liquid mixing plates (115) and second liquid mixing plates (117) are evenly distributed on the fixed rod (114), and the first liquid mixing plates (115) and the second liquid mixing plates (117) are arranged at intervals, a plurality of second flow guide grooves (116) are evenly distributed on the first liquid mixing plate (115), and a plurality of third flow guide grooves (118) are evenly distributed on the second liquid mixing plate (117).

6. The automatic dispensing system for washing liquid for nitrotoluene production according to claim 4, characterized in that: A limiting ring (110) is fixedly connected inside the mixing liquid pipe (19), and the limiting ring (110) is arranged at the bottom end of the flow guide (112).

7. The automatic dispensing system for washing liquid for nitrotoluene production according to claim 4, characterized in that: The two liquid inlet pipes (13) are fixedly connected to a first flange (14); the top end of the mixing liquid pipe (19) is fixedly connected to a second flange (111); the second flange (111) is fixedly connected to a third flange (119); the third flange (119) is fixedly connected to a liquid outlet pipe (120); and the top end of the liquid outlet pipe (120) is fixedly connected to a fourth flange (121).

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