Flash evaporation optimizing device for hydrogen chloride synthesis
By installing anti-erosion baffles and steam distributors inside the flash evaporation tank, the erosion damage caused by hot water and steam is solved, extending the service life of the flash evaporation tank, reducing corrosion damage, and lowering the company's cost and safety risks.
Patent Information
- Application Number
- CN202520081579.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-14
AI Technical Summary
In existing hydrogen chloride synthesis systems, corrosion and leakage problems caused by the erosion of hot water and steam in the flash tank lead to increased production costs and safety hazards.
By installing anti-erosion baffles and steam distributors inside the flash evaporation tank and optimizing the water circulation jacket structure, the erosion damage of hot water and steam to the inner wall of the flash evaporation tank is reduced. By setting a controller and using the method described in the embodiment, the erosion damage of hot water and steam to the inner wall of the flash evaporation tank is reduced, thus extending the service life of the flash evaporation tank.
It effectively reduces corrosion damage to flash evaporation tanks, extends their service life, reduces enterprise costs, and improves equipment safety and production efficiency.
Smart Images
Figure CN223732124U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of hydrogen chloride synthesis's flash evaporation, and is a flash evaporation optimization device for hydrogen chloride synthesis. BACKGROUND
[0002] At present, the main method for preparing hydrogen chloride is electrolysis. The process flow of electrolysis for producing hydrogen chloride includes two steps: first, electrolysis of saturated brine to produce chlorine and hydrogen; second, ignition and combustion of hydrogen and chlorine in a quartz combustion nozzle (combustion nozzle at the bottom of a hydrogen chloride synthesis furnace) to generate hydrogen chloride gas.
[0003] When chlorine and hydrogen are combusted in the hydrogen chloride synthesis furnace, a large amount of reaction heat is released, the temperature in the flame center zone reaches above 2500 DEG C, and the temperature of the generated hydrogen chloride gas is above 2000 DEG C, that is, about 605 Kcal of heat is released for the synthesis of 1 kg of gaseous hydrogen chloride. The highest temperature of the water circulating in the jacket of the hydrogen chloride synthesis furnace can reach 185 DEG C. A certain chemical enterprise utilizes the heat energy released by the synthesis reaction of the synthesis furnace to recycle and utilize the heat energy of the water circulating in the jacket of the hydrogen chloride synthesis furnace to produce low-pressure steam through a flash tank, which can provide heat energy supply to other process systems or domestic heating systems.
[0004] However, after long-term operation of the flash tank, the hot water inlet of the flash tank causes serious erosion damage to the inner wall material of the flash tank cylinder due to the impact of hot water, and the serious erosion parts have already thinned and perforated, resulting in leakage. On the other hand, the steam outlet pressure at the top of the flash tank cylinder reaches 0.6 MPa, and the steam has been accumulated at the outlet for a long time, which causes serious steam erosion damage to the material of the cylinder around the steam outlet, and the serious erosion parts have also thinned and perforated, resulting in leakage.
[0005] The thinning of the wall of the flash tank cylinder poses a great safety hazard to the enterprise, and the frequent leakage of the flash tank requires the enterprise to purchase a new flash tank, resulting in increased production investment cost, reduced economic benefit, and becoming a technical problem difficult for the enterprise to solve. SUMMARY
[0006] The flash evaporation optimization device for hydrogen chloride synthesis provided by the utility model overcomes the above-mentioned deficiencies of the prior art and effectively solves the problem of easy corrosion and leakage of the flash tank in the existing hydrogen chloride synthesis system.
[0007] The technical scheme of the utility model is realized through the following measures: a flash evaporation optimization device for hydrogen chloride synthesis, which comprises a hydrogen chloride synthesis furnace, a flash tank, a chlorine gas pipeline is fixedly communicated with a first gas inlet at the bottom of the hydrogen chloride synthesis furnace, a hydrogen gas pipeline is fixedly communicated with a second gas inlet at the bottom of the hydrogen chloride synthesis furnace, the hydrogen chloride synthesis furnace comprises a water circulation jacket and a hydrogen chloride synthesis inner cavity, the water circulation jacket is arranged on the outer wall of the hydrogen chloride synthesis inner cavity, the water circulation jacket comprises a first jacket section, a second jacket section, a third jacket section and a fourth jacket section from bottom to top, the adjacent two water circulation jacket sections are separated by annular partition plates, a first desalted water pipeline is fixedly communicated with a first liquid inlet at the lower part of the second jacket section, the flash tank comprises a cylinder and a head, a first hot water pipeline is fixedly communicated between a liquid outlet at the upper part of the second jacket section and a liquid inlet at the upper part of the cylinder, a scouring baffle is fixedly arranged on the inner wall of the cylinder, a steam distributor is horizontally fixedly arranged at the upper part in the cylinder, a steam pipeline is fixedly communicated with a steam outlet at the top of the flash tank, a second hot water pipeline is fixedly communicated between a liquid outlet at the bottom of the flash tank and a liquid inlet at the lower part of the second jacket section, the hydrogen chloride synthesis inner cavity comprises a combustion section, a synthesis section, a transition section and a condensation section from bottom to top, the adjacent two hydrogen chloride synthesis inner cavity sections are communicated with each other, and a hydrogen chloride gas pipeline is fixedly communicated with a gas outlet at the lower part of the condensation section.
[0008] The following is a further optimization or / and improvement of the above-mentioned utility model technical scheme:
[0009] The scouring baffle is arranged on the inner wall of the cylinder opposite to the hot water inlet, and a support plate is fixedly arranged between the scouring baffle and the inner wall of the cylinder.
[0010] The steam distributor 1 or 2 is in the shape of a rectangular plate, and a plurality of air holes penetrating the steam distributor from top to bottom are arranged on the steam distributor.
[0011] A second desalted water pipeline is fixedly communicated between the first desalted water pipeline and a second liquid inlet at the lower part of the second jacket section.
[0012] A first circulating water pipeline is fixedly communicated with a liquid inlet at the lower part of the first jacket section.
[0013] A second circulating water pipeline is fixedly communicated between a liquid outlet at the upper part of the first jacket section and a liquid inlet of the third jacket section.
[0014] A third circulating water pipeline is fixedly communicated with a liquid outlet at the upper part of the third jacket section.
[0015] A fourth circulating water pipeline is fixedly communicated with a liquid inlet at the lower part of the fourth jacket section, and a fifth circulating water pipeline is fixedly communicated with a liquid outlet at the top of the fourth jacket section.
[0016] The first desalted water pipeline between the inlet of the first desalted water pipeline and the second desalted water pipeline, the first circulating water pipeline, the second circulating water pipeline, the third circulating water pipeline, the fourth circulating water pipeline and the fifth circulating water pipeline are fixedly installed with control valves, and the steam pipeline is fixedly installed with a control valve and a remote pressure gauge in sequence along the medium flow direction.
[0017] The device further comprises a controller, and the control valves, the remote pressure gauge and the remote liquid level meter are electrically connected with the controller.
[0018] The device has the advantages of reasonable and compact structure, convenient use, reduced erosion damage of hot water to the inner wall material of the flash tank, reduced erosion damage of steam to the inner wall material of the flash tank, prolonged service life of the flash tank, improved steam byproduct yield of the hydrogen chloride synthesis furnace, reduced cost investment of enterprises, safety, labor saving, simplicity, high efficiency and the like. BRIEF DESCRIPTION OF DRAWINGS
[0019] BRIEF DESCRIPTION OF DRAWINGS Figure 1 It is a process flow schematic diagram of the device.
[0020] BRIEF DESCRIPTION OF DRAWINGS Figure 2 It is an Figure 1 It is a left sectional view structural schematic diagram of the flash tank.
[0021] BRIEF DESCRIPTION OF DRAWINGS Figure 3 It is an Figure 1 It is a top view structural schematic diagram of the flash tank.
[0022] The codes in the drawings are as follows: 1 is a hydrogen chloride synthesis furnace, 2 is a flash tank, 3 is a chlorine gas pipeline, 4 is a hydrogen gas pipeline, 5 is a water circulating jacket, 6 is a hydrogen chloride synthesis inner cavity, 7 is a first jacket section, 8 is a second jacket section, 9 is a third jacket section, 10 is a fourth jacket section, 11 is a first desalted water pipeline, 12 is a cylinder body, 13 is a head, 14 is a first hot water pipeline, 15 is an anti-erosion baffle, 16 is a steam distributor, 17 is a steam pipeline, 18 is a second hot water pipeline, 19 is a combustion section, 20 is a synthesis section, 21 is a transition section, 22 is a condensation section, 23 is a hydrogen chloride gas pipeline, 24 is a support plate, 25 is a vent hole, 26 is a second desalted water pipeline, 27 is a first circulating water pipeline, 28 is a second circulating water pipeline, 29 is a third circulating water pipeline, 30 is a fourth circulating water pipeline, 31 is a fifth circulating water pipeline, 32 is a control valve, 33 is a remote pressure gauge, 34 is a remote liquid level meter, and 35 is an annular partition ring. DETAILED DESCRIPTION
[0023] The utility model is not limited by the following embodiments, and the specific implementation mode can be determined according to the technical scheme and actual situation of the utility model.
[0024] In the utility model, if no special description, the equipment, device used are the prior art known and common equipment, device.
[0025] In the utility model, for being convenient for description, the relative position relation of each component is all according to the layout mode of the description of the attached Figure 1 , such as: the position relation of front, back, upper, lower, left, right is according to the layout direction of the description of the attached Figure 1 .
[0026] The utility model is further described below in combination with embodiments and drawings:
[0027] Embodiment 1: as shown in the attached Figure 1 , 2 , 3, the flash optimization device of hydrogen chloride synthesis includes hydrogen chloride synthesis furnace 1, flash tank 2, hydrogen chloride synthesis furnace 1 bottom first gas inlet fixed communication has chlorine pipeline 3, hydrogen chloride synthesis furnace 1 bottom second gas inlet fixed communication has hydrogen pipeline 4, hydrogen chloride synthesis furnace 1 includes water circulating jacket 5, hydrogen chloride synthesis inner chamber 6, hydrogen chloride synthesis inner chamber 6 outer wall is wrapped and is set with water circulating jacket 5, water circulating jacket 5 is from below and upwards in turn including first jacket section 7, second jacket section 8, third jacket section 9, fourth jacket section 10, by annular partition ring 35 between every adjacent two water circulating jacket section, second jacket section 8 lower part first liquid inlet fixed communication has first desalted water pipeline 11, flash tank 2 includes cylinder 12 and head 13, second jacket section 5 upper part liquid outlet and cylinder 12 upper part liquid inlet fixed communication has first hot water pipeline 14, cylinder 12 inner wall is fixedly set with anti-scouring baffle 15, cylinder 12 inner upper part is fixedly set with steam distributor 16, flash tank 2 top steam outlet fixed communication has steam pipeline 17, flash tank 2 bottom liquid outlet and second jacket section 8 lower part liquid inlet fixed communication has second hot water pipeline 18, hydrogen chloride synthesis inner chamber 6 is from below and upwards in turn including combustion section 19, synthesis section 20, transition section 21, condensation section 22, every adjacent two hydrogen chloride synthesis inner chamber section is interconnected, condensation section 22 lower part gas outlet fixed communication has hydrogen chloride gas pipeline 23.
[0028] According to the need, the desalted water in the second jacket section 8 absorbs heat to obtain 185℃ superheated water (chlorine and hydrogen in the synthesis section 20 occur chemical exothermic reaction), the hot water is flashed through the flash tank 2 to obtain 0.6MPa steam, which can provide heat energy supply to other process systems or civil heating systems, the anti-erosion baffle 15 and the steam distributor 16 can reduce the erosion of the hot water and the steam to the material of the flash tank 2, prolong the service life of the flash tank 2, reduce the cost investment of the enterprise, and also can provide guarantee for the safe operation of the hydrogen chloride synthesis furnace 1.
[0029] According to the actual need, the flash optimization device for hydrogen chloride synthesis can be further optimized or / and improved:
[0030] Example 2: which is different from example 1 is that: as shown in the figure, the anti-erosion baffle 15 is arranged on the inner wall side of the cylinder 12 opposite to the hot water inlet of the cylinder 12, and the support plate 24 is fixedly arranged between the anti-erosion baffle 15 and the inner wall of the cylinder 12. Figure 2
[0031] According to the need, the anti-erosion baffle 15 is fixed on the inner wall of the cylinder 12 by welding, and is reinforced and supported by the support plate 24, the size and fixed angle of the anti-erosion baffle 15 can be set according to the impact area of the hot water on the inner wall of the cylinder 12, the anti-erosion baffle 15 can reduce the erosion of the hot water fluid to the material of the inner wall of the cylinder 12, the anti-erosion baffle 15 can be used as a sacrificial plate of the flash tank 2, when the anti-erosion baffle 15 is seriously thinned by the erosion of the hot water, a new anti-erosion baffle 15 can be replaced, thereby prolonging the service life of the flash tank 2.
[0032] Example 3: which is different from examples 1 to 2 is that: as shown in the figure, the steam distributor 16 is in the shape of a rectangular plate, and a plurality of air holes 25 are arranged on the steam distributor 16. Figure 3
[0033] According to the need, the steam distributor 16 can be fixed horizontally on the upper part of the cylinder 12 by welding, the steam distributor 16 can uniformly distribute the steam in the flash tank 2, avoid the excessive gathering of the steam at the steam outlet at the top of the flash tank 2, reduce the erosion of the steam to the material of the inner wall of the flash tank 2, and prolong the service life of the flash tank 2.
[0034] Example 4: which is different from examples 1 to 3 is that: as shown in the figure, the second desalted water pipeline 26 is fixedly communicated between the first desalted water pipeline 11 and the lower second liquid inlet of the second jacket section 8. Figure 1
[0035] Example 5: which is different from examples 1 to 4 is that: as shown in the figure, the first circulating water pipeline 27 is fixedly communicated with the lower liquid inlet of the first jacket section 7. Figure 1
[0036] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 As shown, a second circulating water pipeline 28 is fixedly connected between the liquid outlet at the top of the first jacket section 7 and the liquid inlet at the third jacket section 9.
[0037] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 As shown, the upper outlet of the third jacket section 9 is fixedly connected to the third circulating water pipeline 29.
[0038] Example 8: It differs from Examples 1 to 7 in that: as shown in the appendix Figure 1 As shown, the lower inlet of the fourth jacket section 10 is fixedly connected to the fourth circulating water pipeline 30, and the upper outlet of the fourth jacket section 10 is fixedly connected to the fifth circulating water pipeline 31.
[0039] Example 9: It differs from Examples 1 to 8 in that: as shown in the appendix Figure 1 As shown, control valves 32 are fixedly installed on the first demineralized water pipeline 11, the first circulating water pipeline 27, the second circulating water pipeline 28, the third circulating water pipeline 29, the fourth circulating water pipeline 30, and the fifth circulating water pipeline 31 between the inlet of the first demineralized water pipeline 11 and the second demineralized water pipeline 26. Control valves 32 and remote pressure gauges 33 are fixedly installed on the steam pipeline 17 along the medium flow direction. Remote level gauges 34 are fixedly installed on the first jacket section 7, the second jacket section 8, the third jacket section 9, the fourth jacket section 10, and the flash tank 2.
[0040] Example 10: It differs from Examples 1 to 9 in that, as shown in the appendix... Figure 1 As shown, the device also includes a controller, and the control valve 32, remote pressure gauge 33, and remote level gauge 34 are all electrically connected to the controller.
[0041] Depending on the needs, the pipelines and equipment of this flash evaporation optimization unit for hydrogen chloride synthesis may also be equipped with conventional valves, thermometers, and pressure gauges known in the art, according to production requirements. The controller is a DCS controller, and the model of the DCS controller can be the CS3000 controller manufactured by Yokogawa Corporation of Japan.
[0042] Before this utility model was put into use, the flash evaporation tank had been running continuously for 32 months. The remaining wall thickness at the most severely corroded part of the tank body was 2mm to 6mm, and the average annual corrosion rate was 1.50mm / year to 2.25mm / year.
[0043] The flash tank continuously runs for 32 months after the utility model is put into use, the residual wall thickness of the most serious corrosion position of the tank body of the flash tank is 0.5mm to 0.65mm, the annual average corrosion rate is 0.2mm / year to 0.26mm / year, the maintenance cost caused by the leakage of the flash tank can be saved by 100,000 yuan per year, the opening and stopping maintenance frequency of the hydrogen chloride synthesis furnace can be reduced to 10 times per year, and then the safety risk and labor intensity caused by the opening and stopping maintenance of the hydrogen chloride synthesis furnace are reduced.
[0044] The above technical features constitute the embodiments of the utility model, have strong adaptability and implementation effect, and can increase or decrease unnecessary technical features according to actual needs to meet the needs of different situations.
[0045] The use process of the utility model embodiment is as follows: firstly, the chlorine gas and the hydrogen gas enter from the bottom of the hydrogen chloride synthesis furnace 1 through the chlorine gas pipeline 3 and the hydrogen gas pipeline 4 respectively (use the long-lasting lamp to ignite), the reaction sequence of the hydrogen gas and the chlorine gas in the hydrogen chloride synthesis furnace 1 is as follows from bottom to top: intense combustion in the combustion section 19, combination to generate hydrogen chloride gas in the synthesis section 20, hydrogen chloride gas buffering and condensation in the transition section 21, hydrogen chloride gas is fully condensed in the condensation section 22, and the condensed hydrogen chloride gas enters the downstream process system through the hydrogen chloride gas pipeline 23; at the same time, the desalted water enters the second jacket section 8 to absorb heat to obtain hot water (the combination of the chlorine gas and the hydrogen gas in the synthesis section 20 generates exothermic reaction) through the first desalted water pipeline 11 and the second desalted water pipeline 26; then, the hot water in the second jacket section 8 enters the flash tank 2 through the first hot water pipeline 14 to flash to obtain steam, and the steam enters the downstream process system through the steam pipeline 17; finally, the hot water in the flash tank 2 flows back to the second jacket section 8 through the second hot water pipeline 18.
[0046] The use process of the above embodiment further includes that the process water first enters the first jacket section 7 to perform cooling circulation through the first circulating water pipeline 27, then the circulating water in the first jacket section 7 enters the third jacket section 9 to perform cooling circulation through the second circulating water pipeline 28, and finally the circulating water in the third jacket section 9 is discharged into the downstream process system through the third circulating water pipeline 29; on the other hand, the process water also enters the fourth jacket section 10 to perform cooling circulation through the fourth circulating water pipeline 30, and then is discharged into the downstream process system through the fifth circulating water pipeline 31.
Claims
1. A flash optimization apparatus for hydrogen chloride synthesis, characterized by The hydrogen chloride synthesis furnace, the flash tank, the first gas inlet at the bottom of the hydrogen chloride synthesis furnace is fixedly connected with a chlorine pipeline, the second gas inlet at the bottom of the hydrogen chloride synthesis furnace is fixedly connected with a hydrogen pipeline, the hydrogen chloride synthesis furnace comprises a water circulation jacket and a hydrogen chloride synthesis cavity, the outer wall of the hydrogen chloride synthesis cavity is wrapped with the water circulation jacket, the water circulation jacket comprises first, second, third and fourth jacket sections from bottom to top, each two adjacent water circulation jacket sections are separated by an annular partition, the first desalted water pipeline is fixedly connected with the first liquid inlet at the lower part of the second jacket section, the flash tank comprises a cylinder and a head, the first hot water pipeline is fixedly connected between the liquid outlet at the upper part of the second jacket section and the liquid inlet at the upper part of the cylinder, the inner wall of the cylinder is fixedly provided with a scouring baffle, the steam distributor is fixedly arranged horizontally at the upper part of the cylinder, the steam pipeline is fixedly connected with the steam outlet at the top of the flash tank, the second hot water pipeline is fixedly connected between the liquid outlet at the bottom of the flash tank and the liquid inlet at the lower part of the second jacket section, the hydrogen chloride synthesis cavity comprises combustion, synthesis, transition and condensation sections from bottom to top, each two adjacent hydrogen chloride synthesis cavity sections are connected with each other, and the hydrogen chloride gas pipeline is fixedly connected with the gas outlet at the lower part of the condensation section.
2. The flash optimization apparatus for synthesis of hydrogen chloride according to claim 1, characterized in that The scouring baffle is arranged on the inner wall of the cylinder opposite to the hot water inlet, and the support plate is fixedly arranged between the scouring baffle and the inner wall of the cylinder.
3. The flash optimization apparatus for synthesis of hydrogen chloride of claim 1, wherein The steam distributor is in the shape of a rectangular plate, and a plurality of air holes penetrating the steam distributor are arranged on the steam distributor.
4. A flash optimization apparatus for synthesis of hydrogen chloride according to claim 1 or 2 or 3, characterized in that The second desalted water pipeline is fixedly connected between the first desalted water pipeline and the second liquid inlet at the lower part of the second jacket section.
5. The flash optimization apparatus for synthesis of hydrogen chloride according to claim 4, characterized in that The first circulating water pipeline is fixedly connected with the liquid inlet at the lower part of the first jacket section.
6. The flash optimization apparatus for synthesis of hydrogen chloride according to claim 1 or 2 or 3 or 5, characterized in that The second circulating water pipeline is fixedly connected between the liquid outlet at the upper part of the first jacket section and the liquid inlet of the third jacket section.
7. The flash optimization apparatus for synthesis of hydrogen chloride according to claim 6, characterized in that The third circulating water pipeline is fixedly connected with the liquid outlet at the upper part of the third jacket section.
8. The flash optimization device for synthesis of hydrogen chloride according to claim 1 or 2 or 3 or 5 or 7, characterized in that The fourth circulating water pipeline is fixedly connected with the liquid inlet at the lower part of the fourth jacket section, and the fifth circulating water pipeline is fixedly connected with the liquid outlet at the top of the fourth jacket section.
9. The flash optimization apparatus for synthesis of hydrogen chloride according to claim 8, characterized in that The control valves are fixedly arranged on the first desalted water pipeline, the first circulating water pipeline, the second circulating water pipeline, the third circulating water pipeline, the fourth circulating water pipeline and the fifth circulating water pipeline between the first desalted water pipeline inlet and the second desalted water pipeline, and the control valves, the remote pressure gauge and the remote liquid level meter are fixedly arranged on the first, second, third and fourth jacket sections and the flash tank.
10. The flash optimization apparatus for synthesis of hydrogen chloride according to claim 9, characterized in that The controller is electrically connected with the control valves, the remote pressure gauge and the remote liquid level meter.