CN217541640U - Purging system for powder attached to pipe wall of heat exchanger - Google Patents
Purging system for powder attached to pipe wall of heat exchanger Download PDFInfo
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- CN217541640U CN217541640U CN202221198100.6U CN202221198100U CN217541640U CN 217541640 U CN217541640 U CN 217541640U CN 202221198100 U CN202221198100 U CN 202221198100U CN 217541640 U CN217541640 U CN 217541640U
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Abstract
The utility model belongs to the technical field of methyl alcohol production facility, a heat exchanger pipe wall adheres to powder purging system is related to, including the vertical heat exchanger of the parallelly connected setting more than two, its entry linkage has reaction gas conveying line and is connected with calcium hydrate and sweeps the pipeline, and calcium hydrate sweeps the pipe connection and has the abrasive material jar, and the tank deck and the tank bottoms of abrasive material jar are connected with tank deck nitrogen pipe and tank bottoms nitrogen pipe, and nitrogen gas in it blows the calcium hydrate in the abrasive material jar to calcium hydrate and sweeps the pipeline, and calcium hydrate sweeps the pipeline and is equipped with the diverter valve, sends into different vertical heat exchanger's reaction gas conveying line with calcium hydrate. The utility model has the advantages of through pouring into the calcium hydrate granule, can not influence current process equipment when effectively getting rid of the adnexed powder of heat exchanger pipe wall.
Description
Technical Field
The utility model belongs to the technical field of methyl alcohol production facility, a heat exchanger pipe wall adheres to powder purge system is related to.
Background
In the production and processing of methanol, in order to meet the heat exchange load after the increase of the processing amount of methanol, a methanol-reaction gas vertical heat exchanger is additionally designed, and the methanol-reaction gas vertical heat exchanger has the function of heating saturated gas-phase methanol from a methanol vaporizer through high-temperature reaction gas of a tube pass, so that the temperature of reaction gas entering a quenching tower can be reduced, the cooling load of a quenching water washing system is reduced, and the gas-phase methanol can be heated to improve the temperature of the reaction gas entering the methanol.
However, in daily operation, it is found that the heat exchange effect is affected by the adhesion of catalyst powder carried in the reaction gas to the tube wall of the heat exchanger. After the heat exchange efficiency is reduced, the temperature of the reaction gas entering the quenching tower is obviously increased, the cooling load of a quenching water washing system is increased, and the temperature of the quenching tower is higher; meanwhile, the methanol feed temperature is reduced, the regulating ability of quenching methanol and atomizing methanol is lost, and the load of the vaporizer is increased until the full-load operation of the device cannot be maintained.
In view of the above-mentioned problems, it has been proposed to remove the catalyst powder adhered to the surface of the heat exchanger. Current practice is on-line purging, reducing or stripping adhered catalyst fines by agitation. However, the conventional method is to remove the powder adhered to the wall of the heat exchanger tube by increasing the flow rate of the reaction gas and increasing the linear speed. The method needs to greatly adjust the flux of methanol and reaction gas flow of the heat exchanger, causes the medium flow and temperature of the heat exchanger to be greatly changed during the cutting-out, blowing and putting into use, and has great influence on the process and equipment.
Therefore, how to effectively remove the powder attached to the tube wall of the heat exchanger, and the methanol and reaction gas flow flux of the heat exchanger are not affected during the removal becomes a problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of heat exchanger pipe wall adheres to powder purge system through pouring into the calcium hydrate granule, can not influence current process equipment when effectively getting rid of the adnexed powder of heat exchanger pipe wall.
The technical scheme of the utility model includes: a purging system for powder attached to the pipe wall of a heat exchanger comprises more than two vertical heat exchangers arranged in parallel, wherein an inlet of each vertical heat exchanger is connected with a reaction gas conveying pipeline, a part, close to the inlet of each vertical heat exchanger, of each reaction gas conveying pipeline is connected with a calcium hydroxide purging pipeline, each calcium hydroxide purging pipeline is connected with an abrasive tank, the top of each abrasive tank is connected with a tank top nitrogen pipe, and the bottom of each abrasive tank is connected with a tank bottom nitrogen pipe; the nitrogen gas in the tank top nitrogen pipe and the tank bottom nitrogen pipe blows calcium hydroxide in the grinding material tank to a calcium hydroxide purging pipeline, the calcium hydroxide purging pipeline is provided with a switching valve, and the calcium hydroxide in the calcium hydroxide purging pipeline enters reaction gas conveying pipelines of different vertical heat exchangers under the action of the switching valve.
Preferably, the tank top of the abrasive tank is connected with a feed hopper, and a cut-off valve is arranged on a pipeline connecting the feed hopper and the abrasive tank.
Preferably, the abrasive tank is equipped with the manometer, and the bottom of abrasive tank is connected with the outlet pipe way, be equipped with the supply valve on the outlet pipe way, tank bottoms nitrogen gas pipe with the outlet pipe way intercommunication.
Preferably, the calcium hydroxide purging pipeline is connected with an auxiliary nitrogen pipe, and the auxiliary nitrogen pipe is provided with a pressure gauge and a supply valve.
Preferably, a main valve and a main pilot shower valve are arranged on a branch of the reaction gas conveying pipeline connected with the vertical heat exchanger, and an auxiliary pilot shower valve is arranged on a branch of the calcium hydroxide purging pipeline connected with the reaction gas conveying pipeline.
The beneficial effects of the utility model are that: the method comprises the steps of introducing calcium hydroxide to sweep powder attached to the pipe wall of a heat exchanger, designing an abrasive tank, injecting calcium hydroxide particles into the abrasive tank, connecting a tank top nitrogen pipe and a tank bottom nitrogen pipe to the tank top and the tank bottom respectively, conveying the calcium hydroxide in the abrasive tank to a calcium hydroxide sweeping pipeline through nitrogen in the tank top nitrogen pipe and the tank bottom nitrogen pipe, communicating the calcium hydroxide sweeping pipeline with a reaction gas conveying pipeline of the vertical heat exchanger, and thus forming gas-solid mixing in a heat exchanger pipe bundle to scour catalyst powder attached to the pipe wall. And the calcium hydroxide particles are added into the reaction gas and can react with carbon dioxide in a contact manner to generate calcium carbonate precipitate, and the precipitate enters a sewage lifting tank along with the sewage discharged by the quench tower for precipitation, cannot be brought into a post system and has small influence on a water treatment system. In addition, after the purging is carried out by adopting the calcium hydroxide, the feeding amount of the reaction gas does not need to be adjusted even if the number of the vertical heat exchangers is increased, the temperature change range is small, and the influence on the process and the equipment is small.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of an embodiment.
Wherein:
1. the system comprises a vertical heat exchanger, 2, a reaction gas conveying pipeline, 21, a main valve, 22, a main pilot shower valve, 3, a calcium hydroxide purging pipeline, 31, a switching valve, 32, an auxiliary pilot shower valve, 4, an abrasive tank, 41, a supply valve, 42, a pressure gauge, 5, a loading hopper, 51, a cut-off valve, 6, a nitrogen pipeline, 61, a tank top nitrogen pipe, 62, a tank bottom nitrogen pipe, 63 and an auxiliary nitrogen pipe.
Detailed Description
In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.
In this document, terms such as "upper, lower, left, right, inner, and outer" are established based on the positional relationship shown in the drawings, and the corresponding positional relationship may vary depending on the drawings, and therefore, the terms are not to be construed as an absolute limitation of the protection scope; moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements. In addition, in the embodiments of the present invention, "above", "below", and the like include the present numbers.
As shown in fig. 1, the embodiment of the utility model discloses a heat exchanger pipe wall adheres to powder purging system, including the vertical heat exchanger 1 of the parallelly connected setting more than two, this vertical heat exchanger 1's entry linkage has reaction gas conveying pipeline 2, and the part that reaction gas conveying pipeline 2 is close to vertical heat exchanger 1 entry is connected with calcium hydroxide and sweeps pipeline 3, and calcium hydroxide sweeps pipeline 3 and is connected with abrasive tank 4, and the tank deck of abrasive tank 4 is connected with tank deck nitrogen pipe 61, and the tank bottoms of abrasive tank 4 are connected with tank bottoms nitrogen pipe 62.
Nitrogen in the tank top nitrogen pipe 61 and the tank bottom nitrogen pipe 62 blows calcium hydroxide in the abrasive tank 4 to the calcium hydroxide purging pipeline 3, the calcium hydroxide purging pipeline 3 is provided with a switching valve 31, and the calcium hydroxide in the calcium hydroxide purging pipeline 3 enters the reaction gas conveying pipelines 2 of different vertical heat exchangers 1 under the action of the switching valve 31.
Through design abrasive tank 4 to with the exit linkage calcium hydroxide of abrasive tank 4 sweep pipeline 3, and this calcium hydroxide sweeps pipeline 3 and vertical heat exchanger 1's reaction gas conveying line 2 intercommunication, thereby, the calcium hydroxide in the abrasive tank 4 sweeps pipeline 3 and the reaction gas contact in the reaction gas conveying line 2 through the calcium hydroxide, and both form gas-solid mixture and get into vertical heat exchanger 1 in, sweep its pipe wall adnexed catalyst powder totally. Wherein, partial sodium hydroxide can react with carbon dioxide in the reaction gas to generate calcium carbonate precipitate, but the precipitate can enter a sewage lifting tank along with the blow-off of the quench tower for precipitation, can not be brought into a post-system, and has little influence on a water treatment system. Meanwhile, in consideration of stability in purging with calcium hydroxide particles, nitrogen is used for conveying, and particularly, a tank top nitrogen pipe 61 and a tank bottom nitrogen pipe 62 are respectively arranged at the tank top and the tank bottom of the abrasive tank 4 to form multi-point nitrogen blowing at different positions, so that injected calcium hydroxide is effectively and reliably conveyed to the heat exchanger for powder attachment purging.
As shown in fig. 1, a hopper 5 is connected to the top of the abrasive tank 4, a cut-off valve 51 is provided on a pipeline connecting the hopper 5 and the abrasive tank 4, calcium hydroxide particles are added into the abrasive tank 4 through the hopper 5, and the cut-off valve 51 is used to stop adding calcium hydroxide particles into the abrasive tank 4 when the calcium hydroxide is not needed.
The grinding tank 4 is provided with a pressure gauge 42 for observing the safety therein and indirectly reflecting the amount of nitrogen introduced. Connected to the bottom of the abrasive tank 4 is an outlet line, on which a supply valve 41 is arranged, wherein a tank bottom nitrogen line 62 communicates with the outlet line. An auxiliary nitrogen gas pipe 63 is connected to the calcium hydroxide purge line 3, and a pressure gauge and a supply valve are provided in the auxiliary nitrogen gas pipe 63. Thus, the nitrogen pipeline 6 for purging the calcium hydroxide is formed by the tank top nitrogen pipe 61, the tank bottom nitrogen pipe 62 and the auxiliary nitrogen pipe 63, nitrogen blowing points can be respectively formed on the tank top, the tank bottom and the purging pipeline, and the purging strength of the calcium hydroxide particles is ensured.
A main valve 21 and a main pilot valve 22 are arranged on a branch of the reaction gas conveying pipeline 2 connected with the vertical heat exchanger 1, an auxiliary pilot valve 32 is arranged on a branch of the calcium hydroxide purging pipeline 3 connected with the reaction gas conveying pipeline 2, and a switching valve 31 is arranged in the calcium hydroxide purging pipeline 3 in front of the auxiliary pilot valve 32, so that calcium hydroxide particles can be switched to be sent to different vertical heat exchangers 1 conveniently, and the calcium hydroxide particles in the pipelines are avoided being remained.
Adopt the purge system of this embodiment, because of using nitrogen gas to carry the calcium hydroxide granule, even if vertical heat exchanger 1's quantity increases again, also need not to adjust the feed volume of reaction gas when sweeping, and then avoid because the temperature variation range that adjustment reaction gas feed volume caused is big, great unfavorable to whole technology and equipment influence, compare with current mode of sweeping, can avoid because of sweeping the diene output reduction problem that causes, and technology side flow and temperature need not adjust by a wide margin, can alleviate vertical heat exchanger 1 and leak the problem because of the flange that flow and temperature change arouse by a wide margin.
In the case that the embodiments are not contradictory, at least some of the technical solutions in the embodiments may be recombined to form the essential technical solution of the present invention, and the embodiments may also be cited or included in each other.
The technical principles of the present invention have been described above with reference to specific embodiments, but it should be noted that the above descriptions are only for explaining the principles of the present invention, and should not be interpreted as specifically limiting the scope of the present invention in any way. Based on the explanation herein, those skilled in the art will be able to conceive of other embodiments of the present invention or equivalent alternatives without inventive step, which fall within the scope of the present invention.
Claims (5)
1. The utility model provides a heat exchanger pipe wall adheres to powder purge system, includes vertical heat exchanger (1) of the parallelly connected setting more than two, the entry linkage of vertical heat exchanger (1) has reaction gas conveying line (2), its characterized in that:
the part, close to the inlet of the vertical heat exchanger (1), of the reaction gas conveying pipeline (2) is connected with a calcium hydroxide purging pipeline (3), the calcium hydroxide purging pipeline (3) is connected with an abrasive tank (4), the top of the abrasive tank (4) is connected with a tank top nitrogen pipe (61), and the bottom of the abrasive tank (4) is connected with a tank bottom nitrogen pipe (62);
nitrogen gas in tank deck nitrogen gas pipe (61) and tank bottoms nitrogen gas pipe (62) blows calcium hydroxide in with abrasive tank (4) to calcium hydroxide and sweeps pipeline (3), calcium hydroxide sweeps pipeline (3) and is equipped with diverter valve (31), and calcium hydroxide in calcium hydroxide sweeps pipeline (3) gets into reaction gas conveying line (2) of different vertical heat exchangers (1) under diverter valve (31) effect.
2. The system for purging powder attached to the wall of the heat exchanger tube according to claim 1, wherein: the tank deck of abrasive tank (4) is connected with loading hopper (5), be equipped with trip valve (51) on the pipeline that loading hopper (5) and abrasive tank (4) are connected.
3. The system for purging powder attached to the wall of the heat exchanger tube according to claim 1, wherein: abrasive tank (4) are equipped with manometer (42), and the bottom of abrasive tank (4) is connected with the outlet pipe way, be equipped with supply valve (41) on the outlet pipe way, tank bottoms nitrogen gas pipe (62) with the outlet pipe way intercommunication.
4. A heat exchanger tube wall attached powder purging system as claimed in claim 1 or 3, wherein: the calcium hydroxide purging pipeline (3) is connected with an auxiliary nitrogen pipe (63), and the auxiliary nitrogen pipe (63) is provided with a pressure gauge and a supply valve.
5. The system for purging powder attached to the wall of the heat exchanger tube according to claim 1, wherein: a main valve (21) and a main pilot shower valve (22) are arranged on a branch of the reaction gas conveying pipeline (2) connected with the vertical heat exchanger (1), and an auxiliary pilot shower valve (32) is arranged on a branch of the calcium hydroxide purging pipeline (3) connected with the reaction gas conveying pipeline (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221198100.6U CN217541640U (en) | 2022-05-19 | 2022-05-19 | Purging system for powder attached to pipe wall of heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221198100.6U CN217541640U (en) | 2022-05-19 | 2022-05-19 | Purging system for powder attached to pipe wall of heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217541640U true CN217541640U (en) | 2022-10-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221198100.6U Active CN217541640U (en) | 2022-05-19 | 2022-05-19 | Purging system for powder attached to pipe wall of heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217541640U (en) |
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2022
- 2022-05-19 CN CN202221198100.6U patent/CN217541640U/en active Active
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