A steam compressor protection device suitable for intermittent evaporation and concentration

Abstract

The present invention belongs to the technical field of steam compressor protection, and specifically relates to a steam compressor protection device suitable for intermittent evaporation and concentration, including a feed pump, a distillation tower, a heating heat source, and a heat exchanger. The present invention, through the design of a bypass pipeline device, can utilize the bypass pipeline device to enable the steam compressor body to work on the gas-liquid buffer tank. The steam compressor body is in the bypass pipeline. At this time, the operating frequency of the steam compressor body is adjusted to the lowest, so that it always runs at a low frequency without stopping. In this way, the frequent start-up of the steam compressor body is avoided, and the steam compressor body can be protected. At the same time, a certain amount of hot water is generated, which can be used for other purposes or discharged, saving resources; through the structural design of the wear-resistant component, the screw and the flat star wheel inside the body can be effectively protected, the service life between the two can be improved, and the efficiency of the body can be guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of steam compressor protection, and in particular relates to a steam compressor protection device suitable for intermittent evaporation and concentration. Background Art

[0002] Separation is a crucial process in the fine chemical industry. Rectification is often used to separate different components in a liquid. Rectification utilizes the differences in boiling points among the components in a liquid mixture generated by a process reaction to vaporize a portion of the mixture, forming a vapor fraction that is then condensed, thereby separating the components. It is a typical mass transfer separation process unit operation.

[0003] The most important core device of the distillation separation device is the "distillation separation tower". At the same time, the distillation separation tower is also the most energy-consuming part, and its energy consumption can account for more than 60% of the total energy consumption of the entire process. Therefore, the efficiency of the distillation separation tower directly determines the rationality and economy of the process. In order to reduce the energy consumption of the entire process and improve the efficiency of the distillation separation tower, "heat pump distillation" technology is now being introduced into more and more distillation separation processes. The core concept of "heat pump distillation" is to use mechanical work to improve the quality of the low-temperature heat medium at the top of the distillation separation tower and use it as the heat source for the tower bottom reboiler, thereby realizing the recycling of heat from the tower top and tower bottom. In heat pump distillation technology, the steam compressor used to work on the low-temperature heat medium at the top of the tower is the most core and critical equipment.

[0004] We've noticed that heat pump distillation energy-saving technology is mostly used in continuous distillation and separation production processes. However, if the distillation and separation process is intermittent, meaning the production process runs multiple batches per day, this technology faces bottlenecks, resulting in limited widespread adoption. This is because the frequent startup and shutdown of the process system causes the steam compressor to also start and stop frequently, severely damaging the compressor's mechanical seals and internal rotating components, making them prone to jamming and shutdowns, and affecting the compressor's reliable operation. Furthermore, due to the frequent startups, the compressor's energy consumption remains high, and the energy-saving effect is not significant. This is an unavoidable problem for both single-screw and twin-screw steam compressors. The conventional solution to this problem is to improve and upgrade the compressor's mechanical seals, generally preferring materials that are more heat-resistant, wear-resistant, and impact-resistant to accommodate the damage caused by frequent startups and shutdowns. Summary of the Invention

[0005] The purpose of the present invention is to provide a steam compressor protection device suitable for intermittent evaporation and concentration, which can utilize a bypass pipeline device to enable the steam compressor to work on a gas-liquid buffer tank. The steam compressor is in the bypass pipeline. At this time, the operating frequency of the steam compressor is adjusted to the lowest so that it always runs at a low frequency without stopping. This avoids frequent starting of the steam compressor and can protect the steam compressor. At the same time, a certain amount of hot water is generated, which can be used for other purposes or discharged, saving resources.

[0006] The technical solutions adopted by the present invention are as follows:

[0007] A steam compressor protection device suitable for intermittent evaporation and concentration, comprising a feed pump, a distillation tower, a heating heat source, a heat exchanger, a condensing tank, a circulation pump and a steam compressor body, wherein the output end of the feed pump is connected to the distillation tower, a tenth valve is installed between the feed pump and the distillation tower, the distillation tower is also connected to the heating heat source, a first valve is installed between the distillation tower and the heating heat source, the heating heat source is also connected to the heat exchanger, a sixth valve is installed between the heating heat source and the heat exchanger, the heat exchanger is also connected to the condensing tank, a fifth valve is installed between the heat exchanger and the condensing tank, a ninth valve is installed at the output end of the condensing tank, and the The input end of the circulation pump is connected to the heat exchanger, and an eleventh valve is installed between the input end of the circulation pump and the heat exchanger. The output end of the circulation pump is connected to the distillation tower, and the distillation tower is also connected to the heat exchanger. The air inlet end of the steam compressor main body is connected to the distillation tower, and a second valve is installed between the air inlet end of the steam compressor main body and the distillation tower. The air outlet end of the steam compressor main body is connected to the heat exchanger, and a seventh valve is installed between the air outlet end of the steam compressor main body and the heat exchanger. It also includes a bypass pipeline device, which is connected to the steam compressor main body and is used to protect the steam compressor main body.

[0008] As a preferred solution of the steam compressor protection device suitable for intermittent evaporation and concentration described in the present invention, the bypass pipeline device includes a gas-liquid buffer tank and a water inlet pump, the air inlet end of the gas-liquid buffer tank is connected to the air outlet end of the steam compressor body, an eighth valve is installed between the air inlet end of the gas-liquid buffer tank and the air outlet end of the steam compressor body, the air outlet end of the gas-liquid buffer tank is connected to the air inlet end of the steam compressor body, a third valve is installed between the air outlet end of the gas-liquid buffer tank and the air inlet end of the steam compressor body, the output end of the water inlet pump is connected to the water inlet end of the gas-liquid buffer tank, a twelfth valve is installed between the output end of the water inlet pump and the water inlet end of the gas-liquid buffer tank, the drainage end of the gas-liquid buffer tank is connected to the condensation tank, and a fourth valve is installed between the drainage end of the gas-liquid buffer tank and the condensation tank.

[0009] As a preferred solution of the steam compressor protection device suitable for intermittent evaporation and concentration described in the present invention, a pressure gauge is installed on the surface of the gas-liquid buffer tank.

[0010] A second object of the present invention is to provide a method for using a protective device for a steam compressor for intermittent evaporation and concentration, which specifically comprises the following steps:

[0011] Step 1: pre-treating the mixed material to be distilled and separated and heating it to a predetermined temperature;

[0012] Step 2: Open the feed pump and the tenth valve in sequence, and the material enters the distillation tower; open the water inlet pump and the twelfth valve, add water to the gas-liquid buffer tank until it is 30% full, close the water inlet pump and the twelfth valve, and close the feed pump and the tenth valve after the feeding is completed;

[0013] Step 3: Open the eleventh valve, the sixth valve, and the circulation pump in sequence, allowing the saturated steam from the heating source to enter the shell side of the heat exchanger and begin circulating to heat the material. After releasing the latent heat, the saturated steam condenses into water and enters the condensation tank through the fifth valve; the material is continuously refluxed to the heat exchanger through the circulation pump for heating;

[0014] Step 4: The material in the distillation tower begins to evaporate under the continuous heating of the steam in the heat exchanger, generating secondary steam. When the secondary steam pressure reaches the corresponding index of the set evaporation temperature, the second valve of the one-way valve is opened, and the compressor is started. The secondary steam generated by evaporation in the distillation tower enters the compressor, and the compressor performs compression and work.

[0015] Step 5: When the steam pressure and temperature after the compressor reaches the designed pressure and temperature required for material evaporation, open the seventh valve and the compressed steam enters the heat exchanger for heating and evaporation; at this time, close the sixth valve and keep the third and eighth valves closed, and let the recompressed steam enter the heat exchanger to heat the material;

[0016] Step 6: Maintain the evaporation intensity and the set evaporation time, and continue evaporating the material until the evaporation process is completed;

[0017] Step 7: The evaporation process ends and enters the intermittent period, at which time the material is discharged;

[0018] Step 8: During the process break, close the second and seventh valves, and gradually reduce the compressor operating frequency to 5Hz through the frequency converter; at the same time, open the third and eighth valves, and operate the compressor at a low frequency through the circuit between the inlet and outlet and the gas-liquid buffer tank;

[0019] Step 9: When the intermission period ends and production enters the second batch, close the third valve and the eighth valve; and continue with steps 1 to 8.

[0020] The third object of the present invention is to provide a steam compressor, comprising a body, a screw installed inside the body, positioning shafts installed inside the body and on both sides of the screw, planar star wheels installed on the outside of the two positioning shafts, the two planar star wheels are respectively meshed with the screw, and wear-resistant components are installed on the outside of the planar star wheels.

[0021] As a preferred solution of the steam compressor described in the present invention, the wear-resistant assembly includes a wear-resistant sleeve, a connecting plate, a round rod and a chuck, the wear-resistant sleeve is slidably connected to the outside of the planar star wheel, the connecting plate is fixed on one side of the wear-resistant sleeve, the round rod is fixed on the upper end of the connecting plate, the chuck is sleeved on the outside of the positioning shaft and is located above the round rod, a slot is provided at the lower end of the chuck and close to the round rod, the round rod is located inside the slot, and a nut is threadedly connected to the outside of the positioning shaft and above the chuck.

[0022] As a preferred solution of the steam compressor described in the present invention, the outer side of the screw is plated with a wear-resistant layer, and the material of the wear-resistant layer is high manganese steel.

[0023] The technical effects achieved by the present invention are:

[0024] The present invention adopts the design of the bypass pipeline device, which can utilize the bypass pipeline device to enable the steam compressor to work on the gas-liquid buffer tank. The steam compressor is in the bypass pipeline. At this time, the operating frequency of the steam compressor is adjusted to the lowest, so that it always runs at a low frequency without stopping. In this way, frequent starting of the steam compressor is avoided, and the steam compressor can be protected. At the same time, a certain amount of hot water is generated, which can be used for other purposes or discharged, thereby saving resources.

[0025] The present invention can effectively protect the screw and the flat star wheel inside the machine body through the structural design of the wear-resistant component, thereby increasing the service life of the two and ensuring the use efficiency of the machine body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a flow chart of the protection system of the intermittent distillation separation process of the present invention;

[0027] Figure 2 This is a process flow chart of the existing single-component concentration and continuous distillation separation production process;

[0028] Figure 3 It is a schematic diagram of the structure of the machine body of the present invention;

[0029] Figure 4 is a cross-sectional view of the body of the present invention;

[0030] Figure 5This is a schematic diagram of the connection structure between the wear-resistant component and the flat star wheel of the present invention;

[0031] Figure 6 It is a schematic structural diagram of the wear-resistant component of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the chuck of the present invention.

[0033] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0034] 1. Heating source; 2. Heat exchanger; 3. Distillation tower; 4. Condensation tank; 5. Feed pump; 6. Circulation pump; 7. Steam compressor body; 8. Gas-liquid buffer tank; 9. Water inlet pump; 10. Pressure gauge; 11. First valve; 12. Second valve; 13. Third valve; 14. Fourth valve; 15. Fifth valve; 16. Sixth valve; 17. Seventh valve; 18. Eighth valve; 19. Ninth valve; 20. Tenth valve; 21. Eleventh valve; 22. Twelfth valve; 31. Machine body; 32. Screw; 33. Wear-resistant layer; 34. Positioning shaft; 35. Plane star wheel; 36. Wear-resistant sleeve; 37. Connecting plate; 38. Round rod; 39. Chuck; 40. Nut. DETAILED DESCRIPTION

[0035] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following examples. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention.

[0036] Example 1

[0037] like Figure 1As shown, it is the first embodiment of the present invention, which provides a steam compressor protection device suitable for intermittent evaporation and concentration, including a feed pump 5, a distillation tower 3, a heating heat source 1, a heat exchanger 2, a condenser 4, a circulation pump 6 and a steam compressor body 7. The output end of the feed pump 5 is connected to the distillation tower 3, and a tenth valve 20 is installed between the feed pump 5 and the distillation tower 3. The distillation tower 3 is also connected to the heating heat source 1, and a first valve 11 is installed between the distillation tower 3 and the heating heat source 1. The heating heat source 1 is also connected to the heat exchanger 2, and a sixth valve 16 is installed between the heating heat source 1 and the heat exchanger 2. The heat exchanger 2 is also connected to the condenser 4, and a fifth valve 15 is installed between the heat exchanger 2 and the condenser 4. 4 is installed with a ninth valve 19 at the output end, the input end of the circulating pump 6 is connected to the heat exchanger 2, and an eleventh valve 21 is installed between the input end of the circulating pump 6 and the heat exchanger 2, the output end of the circulating pump 6 is connected to the distillation tower 3, and the distillation tower 3 is also connected to the heat exchanger 2, the air inlet end of the steam compressor main body 7 is connected to the distillation tower 3, and a second valve 12 is installed between the air inlet end of the steam compressor main body 7 and the distillation tower 3, the air outlet end of the steam compressor main body 7 is connected to the heat exchanger 2, and a seventh valve 17 is installed between the air outlet end of the steam compressor main body 7 and the heat exchanger 2. A bypass pipeline device is also included, which is connected to the steam compressor main body 7 and is used to protect the steam compressor main body 7.

[0038] When the present invention is in use, the bypass pipeline device can be used to make the steam compressor main body 7 work on the gas-liquid buffer tank 8. The steam compressor main body 7 is in the bypass pipeline. At this time, the operating frequency of the steam compressor main body 7 is adjusted to the lowest, so that it always runs at a low frequency without stopping. This avoids the frequent start-up of the steam compressor main body 7 and can protect the steam compressor main body 7. At the same time, a certain amount of hot water is generated, which can be used for other purposes or discharged, saving resources.

[0039] like Figure 1 As shown, the bypass pipeline device includes a gas-liquid buffer tank 8 and a water inlet pump 9. The air inlet end of the gas-liquid buffer tank 8 is connected to the air outlet end of the steam compressor main body 7, and an eighth valve 18 is installed between the air inlet end of the gas-liquid buffer tank 8 and the air outlet end of the steam compressor main body 7. The air outlet end of the gas-liquid buffer tank 8 is connected to the air inlet end of the steam compressor main body 7, and a third valve 13 is installed between the air outlet end of the gas-liquid buffer tank 8 and the air inlet end of the steam compressor main body 7. The output end of the water inlet pump 9 is connected to the water inlet end of the gas-liquid buffer tank 8, and a twelfth valve 22 is installed between the output end of the water inlet pump 9 and the water inlet end of the gas-liquid buffer tank 8. The drainage end of the gas-liquid buffer tank 8 is connected to the condensation tank 4, and a fourth valve 14 is installed between the drainage end of the gas-liquid buffer tank 8 and the condensation tank 4.

[0040] Specifically, the mixed material to be distilled and separated is pre-treated and heated to a predetermined temperature, the tenth valve 20 and the feed pump 5 are opened in sequence, and the material enters the distillation tower 3; the water inlet pump 9 and the twelfth valve 22 are opened, and water is added to the gas-liquid buffer tank 8 until it is 30% full, and the water inlet pump 9 and the twelfth valve 22 are closed; after the feeding is completed, the feed pump 5 and the tenth valve 20 are closed, and the eleventh valve 21, the sixth valve 16 and the circulation pump 6 are opened in sequence, so that the saturated steam of the heating heat source 1 enters the shell side of the heat exchanger 2, and begins to circulate and heat the material. The saturated steam after releasing the latent heat condenses into water and enters the condensation tank 4 through the fifth valve 15; the material is continuously refluxed to the heat exchanger 2 through the circulation pump 6 for heating; the material in the distillation tower 3 begins to evaporate under the continuous heating of the steam in the heat exchanger 2, generating secondary steam. When the secondary steam pressure reaches the corresponding index of the set evaporation temperature, the second one-way valve 12 is opened, and the steam compressor main body 7 is started; the secondary steam generated by evaporation in the distillation tower 3 enters the steam compressor main body 7, and the steam pressure The compressor body 7 performs compression and does work; when the steam pressure and temperature after compression by the steam compressor body 7 reach the pressure and temperature required for the designed material evaporation, the seventh valve 17 is opened, and the compressed steam enters the heat exchanger 2 for heating and evaporation. At this time, the sixth valve 16 is closed, and the third valve 13 and the eighth valve 18 are kept in a closed state, and the recompressed steam is passed into the heat exchanger 2 to heat the material, maintaining the evaporation intensity and the set evaporation time, and continuously evaporating the material until the evaporation process is completed; the evaporation process is completed and enters the intermittent period, at which time the discharging operation is carried out; during the intermittent period, the second valve 12 and the seventh valve 17 are closed, and the operating frequency of the steam compressor body 7 is gradually reduced to 5Hz through the frequency converter; at the same time, the third valve 13 and the eighth valve 18 are opened, and the steam compressor body 7 is operated at a low frequency through the loop between the inlet and outlet and the gas-liquid buffer tank 8 for protection; when the intermittent period ends and production enters the second batch, the third valve 13 and the eighth valve 18 are closed, and the above operation is continued to perform the distillation operation.

[0041] Furthermore, a pressure gauge 10 is installed on the surface of the gas-liquid buffer tank 8 to facilitate observation of the pressure of the gas-liquid buffer tank 8 .

[0042] Example 2

[0043] Reference Figure 4 , which is the second embodiment of the present invention, and is based on the previous embodiment.

[0044] like Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, a steam compressor includes a body 31, a screw 32 is installed inside the body 31, positioning shafts 34 are installed inside the body 31 and on both sides of the screw 32, and flat star wheels 35 are installed on the outside of the two positioning shafts 34. The two flat star wheels 35 are respectively engaged with the screw 32, and wear-resistant components are installed on the outside of the flat star wheels 35.

[0045] Specifically, when the screw 32 drives the flat star wheel 35 to rotate, when the two come into contact, the wear-resistant component is interposed between the screw 32 and the flat star wheel 35, and the wear of the two is reduced during transmission.

[0046] like Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the wear-resistant assembly includes a wear-resistant sleeve 36, a connecting plate 37, a round rod 38 and a chuck 39. The wear-resistant sleeve 36 is slidably connected to the outside of the flat star wheel 35, the connecting plate 37 is fixed on one side of the wear-resistant sleeve 36, the round rod 38 is fixed on the upper end of the connecting plate 37, the chuck 39 is sleeved on the outside of the positioning shaft 34 and is located above the round rod 38, and a slot is provided at the lower end of the chuck 39 and near the round rod 38. The round rod 38 is located inside the slot, and a nut 40 is threadedly connected to the outside of the positioning shaft 34 and above the chuck 39.

[0047] Specifically, the wear-resistant sleeve 36 is sleeved on the outside of the planar star wheel 35, the chuck 39 passes through the positioning shaft 34 and is placed above the planar star wheel 35, and the round rod 38 is stuck inside the slot. By rotating the chuck 39 and pulling the connecting plate 37, the wear-resistant sleeve 36 is brought close to the planar star wheel 35, and the chuck 39 is locked to the upper part of the planar star wheel 35 by the nut 40 for fixation.

[0048] Furthermore, the outer side of the screw 32 is plated with a wear-resistant layer 33 , which is made of high manganese steel and protects the surface of the screw 32 , thereby increasing the service life of the screw 32 .

[0049] The working principle of the present invention is as follows: when the heat pump distillation separation production system enters an intermittent period, the process flow is switched, the air inlet pipe valve of the main process system entering the steam compressor main body 7 is closed, the bypass pipeline device valve is opened, the pipeline valve of the compressor outlet entering the heat exchanger 2 is closed, and the pipeline valve of the compressor outlet entering the gas-liquid buffer tank 8 is opened. In this way, the steam compressor main body 7 performs work on the gas-liquid buffer tank 8, and the steam compressor main body 7 is in the loop of the bypass pipeline device. At this time, the operating frequency of the steam compressor main body 7 is adjusted to the lowest, so that it always runs at a low frequency without stopping, avoiding frequent starting of the steam compressor main body 7, and protecting the steam compressor main body 7. At the same time, a certain amount of hot water is generated, which can be used for other purposes or discharged, saving resources.

[0050] When the screw 32 drives the flat star wheel 35 to rotate, the two are in contact through the wear-resistant component between the screw 32 and the flat star wheel 35. During transmission, the wear-resistant component reduces the wear between the two, improves the service life of the two, and ensures the efficiency of the body 31.

[0051] The foregoing is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained herein shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.

Claims

1. A steam compressor protection device suitable for intermittent evaporation and concentration, characterized by: The invention comprises a feed pump (5), a distillation tower (3), a heating heat source (1), a heat exchanger (2), a condensing tank (4), a circulating pump (6) and a steam compressor body (7), wherein the output end of the feed pump (5) is connected to the distillation tower (3) through a tenth valve (20), the distillation tower (3) is connected to the heating heat source (1) through a first valve (11), the heating heat source (1) is connected to the heat exchanger (2) through a sixth valve (16), the heat exchanger (2) is connected to the condensing tank (4) through a fifth valve (15), the output end of the condensing tank (4) is provided with a ninth valve (19), the input end of the circulating pump (6) is connected to the heat exchanger (2) through an eleventh valve (21), and the output end of the circulating pump (6) is connected to the distillation tower (3), and the distillation tower (3) is also connected to the heat exchanger (2); The air inlet end of the steam compressor body (7) is connected to the distillation tower (3) through the second valve (12), and one of the air outlet ends of the steam compressor body (7) is connected to the heat exchanger (2) through the seventh valve (17); It also includes a bypass pipeline device, the inlet and outlet of the bypass pipeline device are respectively connected to the inlet and outlet of the steam compressor body (7), and the bypass pipeline device enables the steam compressor body (7) to maintain low-frequency operation without stopping during the intermittent period of distillation separation production; The bypass pipeline device includes a gas-liquid buffer tank (8) and a water inlet pump (9), the gas inlet end of the gas-liquid buffer tank (8) is connected to the gas outlet end of the steam compressor body (7) through an eighth valve (18), the gas outlet end of the gas-liquid buffer tank (8) is connected to the gas inlet end of the steam compressor body (7) through a third valve (13), the output end of the water inlet pump (9) is connected to the water inlet end of the gas-liquid buffer tank (8) through a twelfth valve (22), and the water discharge end of the gas-liquid buffer tank (8) is connected to the condensation tank (4) through a fourth valve (14).

2. A steam compressor protection device suitable for intermittent evaporation and concentration according to claim 1, characterized in that: A pressure gauge (10) is installed on the surface of the gas-liquid buffer tank (8).

3. A method for using a steam compressor protection device for intermittent evaporation and concentration, comprising the steam compressor protection device for intermittent evaporation and concentration according to any one of claims 1 to 2, characterized in that: The specific steps include: Step 1: pre-treating the mixed material to be distilled and separated and heating it to a predetermined temperature; Step 2: Open the feed pump (5) and the tenth valve (20) in sequence, and the material enters the distillation tower (3); open the water inlet pump (9) and the twelfth valve (22), and add water to the gas-liquid buffer tank (8) until it reaches 30% of the gas-liquid buffer tank (8); close the water inlet pump (9) and the twelfth valve (22); and after the feeding is completed, close the feed pump (5) and the tenth valve (20); Step 3: Open the eleventh valve (21), the sixth valve (16) and the circulation pump (6) in sequence, and use the saturated steam from the heating source (1) to enter the shell side of the heat exchanger (2) to start circulating heating of the material. After releasing the latent heat, the saturated steam condenses into water and enters the condensation tank (4) through the fifth valve (15); the material is continuously refluxed to the heat exchanger (2) through the circulation pump (6) for heating; Step 4: The material in the distillation tower (3) begins to evaporate under the continuous heating of the steam in the heat exchanger (2), generating secondary steam; when the secondary steam pressure reaches the index corresponding to the set evaporation temperature, the second one-way valve (12) is opened, the compressor is started, and the secondary steam generated by evaporation in the distillation tower (3) enters the compressor, and the compressor performs compression and performs work; Step 5: When the pressure and temperature of the steam compressed by the compressor reach the pressure and temperature required for the designed material evaporation, the seventh valve (17) is opened, and the compressed steam enters the heat exchanger (2) for heating and evaporation; at this time, the sixth valve (16) is closed, and the third valve (13) and the eighth valve (18) are kept in the closed state, and the recompressed steam is passed into the heat exchanger (2) to heat the material; Step 6: Maintain the evaporation intensity and the set evaporation time, and continue evaporating the material until the evaporation process is completed; Step 7: The evaporation process ends and enters the intermittent period, at which time the material is discharged; Step 8: During the process break, close the second valve (12) and the seventh valve (17), and gradually reduce the operating frequency of the compressor to 5 Hz through the frequency converter; at the same time, open the third valve (13) and the eighth valve (18), and operate the compressor at a low frequency through the loop between the inlet and outlet and the gas-liquid buffer tank (8); Step 9: When the intermission period ends and production enters the second batch, close the third valve (13) and the eighth valve (18); and continue to perform steps 1 to 8.

4. A steam compressor, characterized in that: The steam compressor protection device for intermittent evaporation and concentration according to any one of claims 1 to 2 comprises a body (31), a screw (32) is installed inside the body (31), positioning shafts (34) are installed inside the body (31) and on both sides of the screw (32), and planar star wheels (35) are installed on the outside of the two positioning shafts (34), the two planar star wheels (35) are respectively meshed with the screw (32), and a wear-resistant component is installed on the outside of the planar star wheels (35); The wear-resistant assembly includes a wear-resistant sleeve (36), a connecting plate (37), a round rod (38) and a chuck (39), wherein the wear-resistant sleeve (36) is slidably connected to the outside of the plane star wheel (35), the connecting plate (37) is fixed to one side of the wear-resistant sleeve (36), the round rod (38) is fixed to the upper end of the connecting plate (37), the chuck (39) is sleeved on the outside of the positioning shaft (34) and is located above the round rod (38), a slot is provided at the lower end of the chuck (39) and near the round rod (38), the round rod (38) is located inside the slot, and a nut (40) is threadedly connected to the outside of the positioning shaft (34) and located above the chuck (39).

5. A steam compressor according to claim 4, characterized in that: The outer side of the screw (32) is plated with a wear-resistant layer (33), and the material of the wear-resistant layer (33) is high manganese steel.

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