A steam condensate system

Abstract

A steam condensate system, comprising a vacuum generator, the vacuum generator comprising an ejector, a water tank and a high-pressure water pump, the ejector, the water tank and the high-pressure water pump are connected in a closed loop; wherein the ejector is designed as a hollow column, the top and bottom of the ejector are respectively provided with an ejector port and a discharge port, the ejector port is connected to the high-pressure water pump; the ejector is also provided with a vacuum chamber and a venturi tube interconnected with each other, the vacuum chamber is located at the upper part of the ejector, the venturi tube is located at the lower part of the ejector, and the vacuum chamber is also provided with a spray nozzle; the upper side of the ejector is also provided with a suction port, the suction port is connected to the vacuum chamber. Compared with conventional vacuum pumps, the vacuum generator of the present invention is not only simple in structure, easy to install and overhaul and maintain, but also has a much higher energy efficiency than ordinary vacuum pumps, which is extremely beneficial for controlling and saving production costs; the present invention is highly practical and has a strong promotion significance.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking, and in particular to a steam condensate system. Background Art

[0002] After the steam in the steam condensate system of the paper machine enters the drying cylinder, heat exchange is carried out. The steam condenses into water and its volume becomes smaller. A drainage pressure difference is formed at the inlet and outlet of the drying cylinder to discharge the condensed water in the drying cylinder. However, the non-condensable gas in the system will accumulate in the drying cylinder and the system due to its small volume change, affecting the formation of the drainage pressure difference at the inlet and outlet, resulting in abnormal drainage of each air intake section of the steam condensate system. A conventional steam condensate system will design a tube bundle surface condenser and a vacuum pump at the tail end to exchange heat between the non-condensable gas in the system and the low-temperature steam in the tail section through the surface condenser and discharge the system. However, due to the high energy consumption of the vacuum pump, the one-time installation cost and maintenance cost, and the non-condensable gas after heat exchange has some heat that can be recycled, direct discharge will cause energy waste. Therefore, the existing steam condensate system often consumes a lot and has low efficiency, which greatly affects the overall process of papermaking production. Summary of the invention

[0003] Based on this, it is necessary to provide a steam condensate system to address the deficiencies in the prior art.

[0004] A steam condensate system, comprising a vacuum generator, the vacuum generator comprising an ejector, a water tank and a high-pressure water pump, wherein the ejector, the water tank and the high-pressure water pump are connected in a closed loop. The ejector is designed as a hollow column, and the top and bottom ends of the ejector are respectively provided with an ejector port and a discharge port, and the ejector port is connected to the high-pressure water pump. The ejector is also provided with a vacuum chamber and a venturi tube interconnected with each other, the vacuum chamber is located at the upper part of the ejector, the venturi tube is located at the lower part of the ejector, and a spray nozzle is also provided in the vacuum chamber. A suction port is also provided on one side of the upper part of the ejector, and the suction port is connected to the vacuum chamber.

[0005] Furthermore, a water tank thermometer is provided in the water tank, and a clean water replenishment valve is also provided at the water inlet of the water tank, and the clean water replenishment valve is connected to the water tank thermometer signal.

[0006] Furthermore, the steam condensate system further comprises a surface condenser, the surface condenser is provided with a first steam inlet, a cold water inlet and a first condensate outlet. The first condensate outlet is provided with a surface condenser thermometer and a first automatic regulating valve, and the surface condenser thermometer is signal-connected to the first automatic regulating valve.

[0007] Furthermore, the steam condensate system also includes a first steam-water separator, a second steam-water separator, several third steam-water separators and a fourth steam-water separator, and the first steam-water separator, the second steam-water separator, several third steam-water separators and the fourth steam-water separator are all provided with a main inlet, a steam outlet and a second condensate outlet.

[0008] Furthermore, the main inlet of the first steam-water separator is connected to the surface condenser, and the steam outlet of the first steam-water separator is connected to the suction port of the ejector. The steam outlets of the fourth steam-water separators are all connected to the main inlet of the second steam-water separator.

[0009] Furthermore, the steam condensate water system further comprises a first drying cylinder group, a second drying cylinder group and a plurality of third drying cylinder groups, and the first drying cylinder group, the second drying cylinder group and the plurality of third drying cylinder groups are all provided with a second steam inlet and a third condensate water outlet.

[0010] Furthermore, the third condensed water outlets of the first drying cylinder group and the second drying cylinder group are respectively connected to the main inlets of a plurality of third steam-water separators, the second steam inlet of the second drying cylinder group is also connected to the steam outlet of the second steam-water separator, and the third condensed water outlets of the plurality of third drying cylinder groups are respectively connected to the main inlets of a plurality of fourth steam-water separators.

[0011] Furthermore, the steam condensate system further comprises a plurality of heat pumps, each of which is provided with a main air supply port and a steam output port, and the steam output ports of the plurality of heat pumps are respectively connected to the second steam inlet ports of the first drying cylinder group, the second drying cylinder group and the plurality of third drying cylinder groups. Each of the plurality of heat pumps is also provided with an auxiliary air supply port, and the auxiliary air supply ports of the plurality of heat pumps are respectively connected to the steam outlet ports of the first steam-water separator, the plurality of third steam-water separators and the fourth steam-water separator.

[0012] Furthermore, the steam condensate system further comprises a total condensate tank and a vacuum tank connected to the total condensate tank. The second condensate outlets of the first steam-water separator, the second steam-water separator and the plurality of third steam-water separators are all connected to the total condensate tank. The steam outlets of the plurality of third steam-water separators are also all connected to the vacuum tank.

[0013] Further, a first liquid level gauge is provided in each of the third steam-water separators, and a second automatic regulating valve is provided between each of the third steam-water separators and the total condensate tank, and a plurality of the second automatic regulating valves are respectively connected to the corresponding signals of the first liquid level gauges. A second liquid level gauge is provided in each of the fourth steam-water separators, and a third automatic regulating valve is provided between each of the fourth steam-water separators and the second steam-water separator, and a plurality of the third automatic regulating valves are respectively connected to the corresponding signals of the second liquid level gauges.

[0014] In summary, the beneficial effects of the steam condensate system of the present invention are as follows: negative pressure is generated by designing a vacuum generator composed of an ejector, a high-pressure water pump and a water tank, and heat is further recovered from the tail-end low-temperature steam after being treated by the surface condenser and non-condensable gases are discharged. Compared with conventional vacuum pumps, the vacuum generator is not only simple in structure and easy to install and overhaul, but also the clean water in the water tank can recover the heat in the non-condensable gases as much as possible. In addition, the energy consumption of the ejector and the high-pressure water pump itself is also very low, so that the energy efficiency ratio of the vacuum generator is much higher than that of ordinary vacuum pumps, which is extremely beneficial to the control and saving of production costs. The clean water replenishment of the vacuum generator and the discharge of condensed water from the surface condenser are both controlled by a thermometer. This is achieved through interlocking control with the automatic valve, making the operation of the system highly automated, efficient and reliable; the multiple groups of steam-water separators arranged in the system make the separation treatment of condensed water and steam more efficient, and the steam-water separators are connected in series to achieve multi-stage separation treatment, making the separation of condensed water and steam more thorough, and the steam-water separator is equipped with a level gauge and interlocking control with the automatic valve to discharge condensed water, which can effectively control the amount of water vapor in the steam-water separator to always maintain an appropriate amount, avoiding the problem of no-load or overload operation of the steam-water separator; and the auxiliary air supply port on the heat pump connected to the cylinder group can recycle the steam recovered by the steam-water separator, further improving the energy efficiency ratio of the system; the present invention is highly practical and has a strong promotional significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the system structure of a steam condensate system of the present invention;

[0016] Figure 2 Schematic diagram of the cross-sectional structure of the ejector in the present invention;

[0017] Figure 3 for Figure 1 A magnified schematic diagram of part A;

[0018] Figure 4 for Figure 1 A magnified schematic diagram of part B;

[0019] Figure 5 for Figure 1 Enlarged schematic diagram of part C. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the invention more clearly understood, the invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and are not used to limit the invention.

[0021] like Figures 1 to 5As shown, the present invention provides a steam condensate system 100, which includes a vacuum generator 10, wherein the vacuum generator 10 includes an ejector 11, a water tank 12 and a high-pressure water pump 13, and the ejector 11, the water tank 12 and the high-pressure water pump 13 are connected in a closed loop.

[0022] The ejector 11 is designed in a hollow columnar shape, and a jet port 111 and a discharge port 112 are respectively provided at the top and bottom of the ejector 11, and the jet port 111 is connected to the high-pressure water pump 13. The ejector 11 is also provided with a vacuum chamber 113 and a venturi 114 which are interconnected, the vacuum chamber 113 is located at the upper part of the ejector 11, the venturi 114 is located at the lower part of the ejector 11, and a spray nozzle 115 is also provided in the vacuum chamber 113. A suction port 116 is also provided on one side of the upper part of the ejector 11, and the suction port 116 is connected to the vacuum chamber 113. When the vacuum generator 10 is working, the water flow drawn by the high-pressure water pump 13 is sprayed from the jet port 111 of the ejector 11, and a high-pressure water column is formed through the spray nozzle 115. The high-pressure water column can form a negative pressure in the vacuum chamber 113 above, thereby sucking the non-condensable gas into the ejector 11 from the suction port 116 and mixing it with the high-pressure water column in the middle section of the venturi 114. The mixed liquid mixed with the non-condensable gas is finally discharged into the water tank 12 from the discharge port 112.

[0023] The water tank 12 is provided with a water tank thermometer 121, and the water inlet of the water tank 12 is also provided with a clean water replenishment valve 122, and the clean water replenishment valve 122 is signal-connected to the water tank thermometer 121. The water tank thermometer 121 can monitor the liquid temperature in the water tank 12 in real time. When the temperature is too high, the water tank thermometer 121 will send a signal to the clean water replenishment valve 122 to control the valve to open for low-temperature clean water supply, and when the temperature is too low, the clean water replenishment valve 122 will be closed to stop supplying water to the water tank 12.

[0024] The steam condensate system 100 further includes a surface condenser 20, which is provided with a first steam inlet a, a cold water inlet b and a first condensate outlet c. The first condensate outlet c is provided with a surface condenser thermometer 21 and a first automatic regulating valve 22, and the surface condenser thermometer 21 is signal-connected to the first automatic regulating valve 22. The surface condenser 20 can transfer the heat of high-temperature steam to cooling water, and the surface condenser thermometer 21 can monitor the temperature of the internal condensate in real time. When the temperature of the condensate reaches the set value, the thermometer will send a signal to the first automatic regulating valve 22 to control the valve to open, thereby transporting the heated condensate to the hot water tank 12 for use in various parts of the paper machine.

[0025] The steam condensate system 100 further includes a first steam-water separator 31, a second steam-water separator 32, a plurality of third steam-water separators 33 and a fourth steam-water separator 34. The first steam-water separator 31, the second steam-water separator 32, the plurality of third steam-water separators 33 and the fourth steam-water separator 34 are all provided with a main inlet d, a steam outlet e and a second condensate outlet f. The main inlet d of the first steam-water separator 31 is connected to the surface condenser 20, and the steam outlet e of the first steam-water separator 31 is connected to the suction port 116 of the ejector 11. The steam outlets e of the plurality of fourth steam-water separators 34 are all connected to the main inlet d of the second steam-water separator 32. The first steam-water separator 31 can further separate the non-condensable gas after the preliminary treatment of the surface condenser 20, and the second steam-water separator 32 can perform secondary separation on the condensate after the preliminary separation of the plurality of fourth steam-water separators 34 upstream, and the utilization rate of the water vapor resources can be higher through multiple graded treatments.

[0026] The steam condensate system 100 further includes a first drying cylinder group 41, a second drying cylinder group 42 and a plurality of third drying cylinder groups 43, wherein the first drying cylinder group 41, the second drying cylinder group 42 and the plurality of third drying cylinder groups 43 are all provided with a second steam inlet g and a third condensate outlet h. The third condensate outlets h of the first drying cylinder group 41 and the second drying cylinder group 42 are respectively connected to the main inlets d of the plurality of third steam-water separators 33, and the second steam inlet g of the second drying cylinder group 42 is also connected to the steam outlet e of the second steam-water separator 32. The third condensate outlets h of the plurality of third drying cylinder groups 43 are respectively connected to the main inlets d of the plurality of fourth steam-water separators 34. The steam recovered from the second steam-water separator 32 can be transported to the second drying cylinder group 42 for recycling, thereby further saving energy.

[0027] The steam condensate system 100 further includes a plurality of heat pumps 50, each of which is provided with a main air supply port i and a steam output port j, and the steam output ports j of the plurality of heat pumps 50 are respectively connected to the second steam inlet g of the first drying cylinder group 41, the second drying cylinder group 42 and the plurality of third drying cylinder groups 43. The plurality of heat pumps 50 are also provided with an auxiliary air supply port k, and the auxiliary air supply ports k of the plurality of heat pumps 50 are respectively connected to the steam outlet e of the first steam-water separator 31, the plurality of third steam-water separators 33 and the fourth steam-water separator 34. The steam recovered from the first steam-water separator 31, the plurality of third steam-water separators 33 and the fourth steam-water separator 34 can be re-transported to the heat pump 50 to be converted into high-temperature steam, and then supplied to the drying cylinder group for recycling, thereby further saving energy.

[0028] The steam condensate system 100 further includes a total condensate tank 60 and a vacuum tank 70 connected to the total condensate tank 60. The second condensate outlets f of the first steam-water separator 31, the second steam-water separator 32 and the plurality of third steam-water separators 33 are all connected to the total condensate tank 60. The steam outlets e of the plurality of third steam-water separators 33 are also all connected to the vacuum tank 70. The total condensate tank 60 can collect and store the condensate in the steam-water separators and transport it to the vacuum tank 70. When passing through the vacuum tank 70, the condensate absorbs the heat in the steam introduced from the third steam-water separators 33. The condensate that absorbs the heat can be supplied to a third party for use, such as for power generation in a power plant.

[0029] A first liquid level gauge (not shown) is provided in each of the third steam-water separators 33, and a second automatic regulating valve 331 is provided between each of the third steam-water separators 33 and the total condensed water tank 60, and a plurality of the second automatic regulating valves 331 are respectively connected to the corresponding signals of the plurality of first liquid level gauges. A second liquid level gauge (not shown) is provided in each of the fourth steam-water separators 34, and a third automatic regulating valve 341 is provided between each of the fourth steam-water separators 34 and the second steam-water separator 32, and a plurality of the third automatic regulating valves 341 are respectively connected to the corresponding signals of the plurality of second liquid level gauges. The liquid level gauge can monitor the condensed water storage in the steam-water separator in real time. When the liquid level reaches the set value, the liquid level gauge will send a signal to the automatic regulating valve to control the valve to open for the discharge of condensed water, thereby avoiding excessive condensed water in the steam-water separator and affecting the normal operation of the device.

[0030] When the present invention is in operation, first, the high-temperature steam is processed by the heat pump 50 and then supplied to the drying cylinder group for use, and the used water-vapor mixture is transported to each steam-water separator for separation treatment. Then, part of the separated steam is transported back to the heat pump 50 or the drying cylinder group for secondary use, and the other part is transported to the surface condenser 20 for condensation heat exchange, and the heat in the steam is transferred to the clean water, and then the hot water is supplied to various parts of the paper machine for use. The condensed water separated by the steam-water separator is all collected and stored in the total condensed water tank 60 and then introduced into the vacuum tank 70. At the same time, the vacuum tank 70 also introduces part of the steam from the steam-water separator. After the condensed water absorbs the heat in the steam, it is supplied to the power plant for use.

[0031] After the surface condenser 20 condenses the steam, some non-condensable gases will still remain. The vacuum generator 10 will absorb these non-condensable gases under negative pressure through the cooperation between the high-pressure water pump 13 and the ejector 11, mix them into the high-pressure water column and discharge them into the water tank 12. The mixed hot water in the water tank 12 can be further supplied to various parts of the paper machine for use.

[0032] In summary, the beneficial effects of the steam condensate system 100 of the present invention are as follows: negative pressure is generated by designing a vacuum generator 10 composed of an ejector 11, a high-pressure water pump 13 and a water tank 12, and heat is further recovered from the tail-end low-temperature steam treated by the surface condenser 20 and non-condensable gas is discharged. Compared with conventional vacuum pumps, the vacuum generator 10 is not only simple in structure and easy to install and repair, but also the clean water in the water tank 12 can recover the heat in the non-condensable gas as much as possible. In addition, the energy consumption of the ejector 11 and the high-pressure water pump 13 is also very low, so that the energy efficiency ratio of the vacuum generator 10 is much higher than that of ordinary vacuum pumps, which is extremely beneficial to the control and saving of production costs; the clean water replenishment of the vacuum generator 10 and the surface condenser 20 The condensed water discharge is achieved through the interlocking control of the thermometer and the automatic valve, making the operation of the system highly automated, efficient and reliable; the multiple groups of steam-water separators arranged in the system make the separation treatment of condensed water and steam more efficient, and the steam-water separators are connected in series to achieve multi-stage separation treatment, making the separation of condensed water and steam more thorough, and the liquid level meter and the automatic valve interlocking control arranged in the steam-water separator for the discharge of condensed water can effectively control the amount of water vapor in the steam-water separator to always maintain an appropriate amount, avoiding the problem of no-load or overload operation of the steam-water separator; and the auxiliary air supply port k on the heat pump 50 connected to the cylinder group can recycle the steam recovered by the steam-water separator, further improving the energy efficiency ratio of the system; the present invention is highly practical and has a strong promotion significance.

[0033] The above-mentioned embodiment only expresses one implementation method of the invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the inventive concept, which all belong to the protection scope of the invention. Therefore, the protection scope of the invention patent shall be based on the attached claims.

Claims

1. A steam condensate system, characterized in that: A steam condensate water system, comprising a vacuum generator, the vacuum generator comprising an ejector, a water tank and a high-pressure water pump, the ejector, the water tank and the high-pressure water pump being connected in a closed loop; wherein the ejector is designed in a hollow columnar shape, the top and bottom ends of the ejector are respectively provided with an ejector port and a discharge port, the ejector port being connected to the high-pressure water pump; the ejector is also provided with a vacuum chamber and a venturi which are interconnected, the vacuum chamber is located at the upper part of the ejector, the venturi is located at the lower part of the ejector, and a spray nozzle is also provided in the vacuum chamber; a suction port is also provided on one side of the upper part of the ejector, the suction port being connected to the vacuum chamber; the steam condensate water system also comprises a surface condenser, the surface condenser is provided with a first steam inlet, a cold water A water inlet and a first condensate outlet; a surface condenser thermometer and a first automatic regulating valve are provided on the first condensate outlet, and the surface condenser thermometer is signal-connected to the first automatic regulating valve; the steam condensate system also includes a first steam-water separator, a second steam-water separator, a plurality of third steam-water separators and a fourth steam-water separator, and the first steam-water separator, the second steam-water separator, the plurality of third steam-water separators and the fourth steam-water separator are all provided with a main inlet, a steam outlet and a second condensate outlet; the steam condensate system also includes a first drying cylinder group, a second drying cylinder group and a plurality of third drying cylinder groups, and the first drying cylinder group, the second drying cylinder group and the plurality of third drying cylinder groups are all provided with a second steam inlet and a third condensate outlet.

2. The steam condensate system according to claim 1, characterized in that: A water tank thermometer is arranged in the water tank, and a clean water replenishing valve is also arranged at the water inlet of the water tank. The clean water replenishing valve is connected with the signal of the water tank thermometer.

3. The steam condensate system according to claim 1, characterized in that: The main inlet of the first steam-water separator is connected to the surface condenser, and the steam outlet of the first steam-water separator is connected to the suction port of the ejector; the steam outlets of the fourth steam-water separators are all connected to the main inlet of the second steam-water separator.

4. The steam condensate system according to claim 1, characterized in that: The third condensate outlets of the first drying cylinder group and the second drying cylinder group are respectively connected to the main inlets of several third steam-water separators, and the second steam inlet of the second drying cylinder group is also connected to the steam outlet of the second steam-water separator; the third condensate outlets of several third drying cylinder groups are respectively connected to the main inlets of several fourth steam-water separators.

5. The steam condensate system according to claim 4, characterized in that: It also includes a plurality of heat pumps, each of which is provided with a main air supply port and a steam output port, and the steam output ports of the plurality of heat pumps are respectively connected to the second steam inlets of the first drying cylinder group, the second drying cylinder group and the plurality of third drying cylinder groups; the plurality of heat pumps are also provided with an auxiliary air supply port, and the auxiliary air supply ports of the plurality of heat pumps are respectively connected to the steam outlets of the first steam-water separator, the plurality of third steam-water separators and the fourth steam-water separator.

6. The steam condensate system according to claim 1, characterized in that: It also includes a total condensate water tank and a vacuum tank connected to the total condensate water tank; the second condensate water outlets of the first steam-water separator, the second steam-water separator and several third steam-water separators are all connected to the total condensate water tank; the steam outlets of several third steam-water separators are also connected to the vacuum tank.

7. The steam condensate system according to claim 6, characterized in that: A first liquid level gauge is provided in each of the third steam-water separators, and a second automatic regulating valve is provided between each of the third steam-water separators and the total condensate tank, and the second automatic regulating valves are respectively connected to the corresponding signals of the first liquid level gauges; a second liquid level gauge is provided in each of the fourth steam-water separators, and a third automatic regulating valve is provided between each of the fourth steam-water separators and the second steam-water separators, and the third automatic regulating valves are respectively connected to the corresponding signals of the second liquid level gauges.

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