Low-elevation vacuum desorption deaerator

Abstract

The invention discloses a low-elevation vacuum desorption deaerator, and relates to the technical field of deoxidation equipment, the low-elevation vacuum desorption deaerator comprises a gas-water separator, the gas-water separator is connected with a water-ring vacuum pump, and the first-stage deaeration adopts an independent vacuum deaeration mode. The external vacuum pump only sucks the oxygen-containing gas desorbed from the vacuum tank and does not sucks the oxygen-containing gas in the rear desorption tank, so that the vacuum tank is ensured to be in an ultimate vacuum state, and in the second stage, pure desorption deoxygenation is adopted. Water subjected to first-stage deoxygenization is fed into a desorption tank through a water diversion system composed of a water diversion pump, a water diversion ejector, an auxiliary pipeline and a valve, it is guaranteed that the desorption tank is in a normal pressure state, a reactant is not purely placed in a reactor, and a three-way catalytic device is placed on the upper portion of the reactant, so that oxygen-containing gas reacts with reactant activated carbon, and the oxygen-containing gas is separated from the desorption tank. A small amount of carbon monoxide generated due to the existence of a high-temperature section is converted into carbon dioxide, so that the oxyphilicity of the mixed gas in water is improved.

Description

Technical Field

[0001] The invention relates to the technical field of deoxidation equipment, in particular to a low-standard high-vacuum desorption deoxidizer. Background Art

[0002] As the normal temperature deoxidation equipment of boilers, chemical deoxidizers, vacuum deoxidizers, sponge iron deoxidizers, vacuum electrochemical chemical trinity deoxidizers and vacuum analysis electrochemical trinity series deoxidizers have always been used. In recent years, vacuum electrochemical chemical trinity deoxidizers or vacuum analysis electrochemical trinity series deoxidizers have been mainly used. However, there are two difficult-to-overcome shortcomings of the vacuum electrochemical chemical trinity deoxidizer. First, although some deoxidized water refluxes in the water pump in the vacuum breaking device, the reflux water cannot offset the vacuum degree in the vacuum tank, so it is still impossible to overcome the phenomenon that the water pump cannot absorb water under high vacuum, resulting in the problem that the water pump cannot supply water under high vacuum conditions. Therefore, in order to avoid the frequent water supply interruption problem, the equipment manufacturer adopts electrical control measures to maintain the equipment at a lower vacuum degree of -0.05 to -0.06MPa. However, the deoxidation of the equipment is not thorough when it is running at a low vacuum degree, and thus the effect of vacuum deoxidation cannot be fully utilized, resulting in poor effect of the first vacuum deoxidation, increasing the burden on the second-stage deoxidation element, namely electrochemical deoxidation, which requires increased electric energy for electrolysis. Due to the increase in electrolytic electric energy, a lot of divalent iron ions (Fe2+) are ionized and removed from the anode plate. After the divalent iron reacts with residual oxygen, it eventually causes the trivalent iron ions (Fe3+) in the water to exceed the standard. Although the equipment manufacturer has adopted an iron removal device, practice has shown that the iron in the boiler water supply often exceeds the standard. The disadvantages of this deoxidation equipment are: 1. Due to the continuous adjustment of the vacuum degree (when the vacuum degree is higher than the set value, the vacuum breaking valve needs to be opened to add air to the equipment), the deoxidation effect is unstable; 2. Since the deoxidation effect of high vacuum cannot be fully utilized, the electrolysis stage consumes a lot of electric energy and it is very easy to cause the iron ions in the water supply to exceed the standard.

[0003] The vacuum desorption electrochemical trinity series deaerator, which has not yet been fully promoted, is compared with the aforementioned vacuum electrochemical trinity deaerator. In this process, all the oxygen-containing gas sucked from the first-stage vacuum deaeration stage is sent to the subsequent heater to react with the reactant (activated carbon or anthracite), resulting in excessive consumption of reactants and excessive loss of power provided for the reaction. Therefore, the disadvantages of this deaerator are: 1. Since all the oxygen-containing gas is sent to the heater to be reacted with the deaerator, the deaerator consumption is too large, which not only increases the operating cost, but also accelerates the frequency of deaerator addition, which brings difficulties to the operation. Inconvenience; 2. Since all oxygen-containing gases are processed in the heater, the heater requires more electricity. Therefore, this type of deoxygenation equipment consumes more electricity than the above-mentioned vacuum electrochemical chemical trinity deoxygenator. Excessive electricity consumption does not meet the energy-saving requirements. 3. Since each container of this type of deoxygenator is in a vacuum state, the last vacuum container is led out by a water pump. In order to ensure that the water pump can pump water normally, it still works in a low vacuum, resulting in the vacuum deoxygenation effect not being fully utilized, making the first-stage deoxygenation effect not high, and relying on the second-stage electrolytic deoxygenation, which still results in large electricity consumption and excessive trivalent iron ions (Fe3+) in the produced water. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a low-standard high-vacuum desorption deaerator to solve the above technical problems.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-standard high-vacuum desorption deoxygenator, including a gas-water separator, the gas-water separator is connected to a water ring vacuum pump, the output end of the water ring vacuum pump is connected to a vacuum degassing tower, the vacuum degassing tower is connected to a water ejector, one side of the water ejector is connected to a water diversion pump, one side of the water diversion pump is connected to a water ejector, the lower end of the water ejector is connected to a gas-water mixer, the gas-water mixer is connected to a decomposition tower, one side of the decomposition tower is connected to a water supply pump, one side of the water ejector is connected to a gas heat exchanger, the upper end of the decomposition tower is connected to a steam-water separator, the lower end of the steam-water separator is connected to a water seal, the steam-water separator is connected to the gas heat exchanger, and one side of the gas heat exchanger is connected to a gas reactor.

[0006] Preferably, a softened water inlet is provided on one side of the vacuum degassing tower, and a deoxygenation spray device is provided in the vacuum degassing tower, and the deoxygenation spray device is located on the softened water inlet side.

[0007] Preferably, a deep deoxidizing filler is provided in the vacuum degassing tower and below the deoxidizing spray device.

[0008] Preferably, a water distribution orifice plate is provided in the analytical tower.

[0009] Preferably, an electric heating tube is provided at the upper end of the gas reactor.

[0010] Preferably, a three-way catalyst and an activated carbon reactant are sequentially arranged in the gas reactor below the electric heating tube from top to bottom.

[0011] Beneficial effects

[0012] The present invention provides a low-profile high-vacuum desorption deaerator that can accommodate installation spaces at varying heights. Previous desorption deaerators were limited in installation height by the height of the deaeration water tank, requiring the desorption tower to be at least 1 meter higher than the top of the deaeration water tank. In general, deaeration water tanks are typically over 4 meters high, requiring the desorption tower to be no less than 5 meters high. This height restriction prevents some users from transporting or installing the deaerator in complete sets due to insufficient workshop height or inability to enter the workshop through upright doors. The height of each tank in the deaerator in this patented application can be adjusted to the user's workshop space height, generally not exceeding 3.5 meters. This facilitates long-distance transportation, complete set production, and rapid on-site installation.

[0013] Significant savings in electrical energy and materials are achieved. This is primarily reflected in the following: 1. Electrolytic deoxidation is not used as a secondary deoxidizer, thereby saving the electrical energy consumed by electrolysis; 2. Only approximately 10% of the oxygen-containing gas is introduced into the heater, significantly reducing the electrical energy used in the heating chamber and the cost of reactants (such as activated carbon), thereby significantly reducing energy consumption in two ways. The energy consumption of the deoxidizer in this patent application is approximately 70% of that of a vacuum electrochemical deoxidizer and approximately 55% of that of a vacuum analytical electrochemical deoxidizer.

[0014] The deoxygenation effect is stable and further improved. In the first-stage deoxygenation stage, vacuum deoxygenation is simply implemented, and the vacuum tank implements extreme high vacuum deoxygenation, overcoming the disadvantages of low water temperature and low vacuum deoxygenation, so that 95% of the oxygen is removed here; the remaining 5% of the water is drained to the desorption tank, and through the desorption effect, about 5% of the oxygen-containing gas in the water is transported to the reactor. Only this 5% of the oxygen-containing gas reacts with the reactants. Since the workload of the reactor is reduced, it is conducive to completely removing the residual oxygen in the mixed gas, and the deoxygenation effect is significantly improved, ensuring that the deoxygenation effect is maintained at 0.01-0.05mg / L, which is significantly better than the 0.05-0.1mg / L maintained by other current deoxygenators.

[0015] The produced water does not have excessive iron ions. This is because the equipment does not have an electrochemical deoxidation device, so there is no problem of iron ions being generated by the electrolytic anode plate.

[0016] Easy to transport and install. All machinery, tanks, pipes, and components are assembled on a steel chassis, ensuring safe transportation. On-site commissioning and operation can be completed simply by connecting the electrical control box and the water inlet and outlet, saving labor and effort.

[0017] The first stage of deoxygenation uses a separate vacuum deoxygenation type. The external vacuum pump only sucks the oxygen-containing gas decomposed in the vacuum tank, and does not suck the oxygen-containing gas in the subsequent desorption tank, ensuring that the vacuum tank is in an ultimate vacuum state.

[0018] The second stage of deoxygenation uses simple desorption. The water after the first stage of deoxygenation is sent to the desorption tank through the water diversion system consisting of a water diversion pump, a water diversion ejector, and auxiliary pipes and valves to ensure that the desorption tank is at normal pressure.

[0019] The reactor is not simply filled with reactants, but a three-way catalytic device is placed on top of the reactants, so that when the oxygen-containing gas reacts with the activated carbon in the reactant, a small amount of carbon monoxide produced due to the high temperature section is converted into carbon dioxide, thereby increasing the oxygen affinity of the mixed gas in water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a low-standard high-vacuum desorption deoxygenator described in the present invention.

[0021] In the figure: 1. Gas-water separator; 2. Water ring vacuum pump; 3. Vacuum degassing tower; 4. Water ejector; 5. Water diversion pump; 6. Water supply pump; 7. Desorption tower; 8. Gas-water separator; 9. Water seal; 10. Gas heat exchanger; 11. Gas reactor; 12. Gas-water mixer; 13. Water ejector; 14. Softened water inlet; 15. Deoxidation spray device; 16. Deep deoxidation filler; 17. Water distribution orifice plate; 18. Electric heating tube; 19. Three-way catalyst; 20. Activated carbon reactant. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1The present invention provides a technical solution: a low-grade high-vacuum desorption deaerator, comprising a gas-water separator 1, the gas-water separator 1 is connected to a water ring vacuum pump 2, the output end of the water ring vacuum pump 2 is connected to a vacuum degassing tower 3, the vacuum degassing tower 3 is connected to a water ejector 4, one side of the water ejector 4 is connected to a water diversion pump 5, one side of the water diversion pump 5 is connected to a water ejector vacuum pump 13, the lower end of the water ejector vacuum pump 13 is connected to a gas-water mixer 12, the gas-water mixer 12 is connected to a decomposition tower 7, one side of the decomposition tower 7 is connected to a water supply pump 6, one side of the water ejector vacuum pump 13 is connected to a gas heat exchanger 10, the upper end of the decomposition tower 7 is connected to a steam-water separator 8, the lower end of the steam-water separator 8 is connected to a water seal 9, the steam-water separator 8 is connected to the gas heat exchanger 10, and one side of the gas heat exchanger 10 is connected to a gas reactor 11.

[0024] This embodiment is further configured such that a softened water inlet 14 is provided on one side of the vacuum degassing tower 3 , and a deoxygenation spray device 15 is provided inside the vacuum degassing tower 3 , and the deoxygenation spray device 15 is located on one side of the softened water inlet 14 .

[0025] This embodiment is further configured such that a deep deoxidizing filler 16 is provided in the vacuum degassing tower 3 and below the deoxidizing spray device 15 .

[0026] This embodiment is further configured such that a water distribution orifice plate 17 is provided in the analytical tower 7 .

[0027] This embodiment is further configured such that an electric heating tube 18 is provided at the upper end of the gas reactor 11 .

[0028] This embodiment is further configured such that a three-way catalyst 19 and an activated carbon reactant 20 are sequentially provided in the gas reactor 11 and below the electric heating tube 18 from top to bottom.

[0029] The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process. The specific operations are as follows.

[0030] Embodiment: According to the drawings of the specification, softened water enters the deoxygenation spray device 15 inside the vacuum degassing tower 3 from the softened water inlet 14 on the upper side, and then falls downward into the deep deoxygenation filler 16 to implement deep deoxygenation. After that, the deoxygenated water falls into the bottom of the vacuum degassing tower 3 for storage, completing the first stage of deoxygenation. In this stage, in order to ensure sufficient vacuum in the vacuum degassing tower 3, a water ring vacuum pump 2 is arranged outside the vacuum degassing tower 3. The water ring vacuum pump 2 extracts oxygen-containing gas from the vacuum degassing tower 3, and the extracted oxygen-containing gas is discharged into the gas-water separator 1 for discharge. The water diversion pump 5 and the water ejector 4 form a water diversion device to draw out the water stored at the bottom of the vacuum degassing tower 3, and transport it to the bottom of the desorption tower 7 through the water ejector 13 and the gas-water mixer 12. Since the oxygen-containing water transported from the bottom of the vacuum degassing tower 3 has an affinity with the oxygen-deficient gas in the gas-water mixer 12, the oxygen-deficient gas in the desorption tower 7 carries oxygen in the upward flow process. The residual oxygen in the water is separated from the water layer and enters the upper gas space. The oxygen-containing gas in the upper space of the desorption tower 7 flows from the top of the desorption tower 7 through the steam-water separator 8 due to the induced action of the water jet vacuum pump 13, enters the gas heat exchanger 10 for heating, and then enters the gas reactor 11. The oxygen-containing gas reacts with the activated carbon reactant 20 during the rising process, and the oxygen is converted into carbon dioxide (CO2). The gas continues to rise and flows through the three-way catalyst 19, and the carbon monoxide (CO) produced due to the high temperature during the gas reaction is completely converted into carbon dioxide (CO2) to ensure the oxygen-free gas's affinity for water. The oxygen-free gas flows from the top of the gas reactor 11 through the gas heat exchanger 10 for cooling, and is then sucked by the water jet vacuum pump 13 and mixed with the water that has been deoxygenated but contains residual oxygen delivered by the water pump 5, and then is sent to the desorption tower 7 for secondary deoxygenation. This cycle is repeated to eventually achieve the purpose of final deoxygenation.

[0031] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. A low-grade high-vacuum desorption deaerator, comprising a gas-water separator (1), characterized in that: The gas-water separator (1) is connected to a water ring vacuum pump (2), the output end of the water ring vacuum pump (2) is connected to a vacuum degassing tower (3), the vacuum degassing tower (3) is connected to a water ejector (4), one side of the water ejector (4) is connected to a water diversion pump (5), one side of the water diversion pump (5) is connected to a water ejector (13), the lower end of the water ejector (13) is connected to a gas-water mixer (12), the gas-water mixer (12) is connected to a decomposition tower (7), one side of the decomposition tower (7) is connected to a water supply pump (6), one side of the water jet vacuum pump (13) is connected to a gas heat exchanger (10), the upper end of the decomposition tower (7) is connected to a steam-water separator (8), the lower end of the steam-water separator (8) is connected to a water seal (9), the steam-water separator (8) is connected to the gas heat exchanger (10), and one side of the gas heat exchanger (10) is connected to a gas reactor (11).

2. A low-grade high vacuum desorption deaerator according to claim 1, characterized in that A softened water inlet (14) is provided on one side of the vacuum degassing tower (3), and a deoxygenation spray device (15) is provided inside the vacuum degassing tower (3), and the deoxygenation spray device (15) is located on one side of the softened water inlet (14).

3. A low-grade high vacuum desorption deaerator according to claim 2, characterized in that A deep deoxidizing filler (16) is provided in the vacuum degassing tower (3) and below the deoxidizing spray device (15).

4. A low-grade high vacuum desorption deaerator according to claim 1, characterized in that , a water distribution orifice plate (17) is provided in the analytical tower (7).

5. A low-grade high vacuum desorption deaerator according to claim 1, characterized in that An electric heating tube (18) is provided at the upper end of the gas reactor (11).

6. A low-grade high vacuum desorption deaerator according to claim 5, characterized in that A three-way catalyst (19) and an activated carbon reactant (20) are sequentially arranged in the gas reactor (11) below the electric heating tube (18) from top to bottom.

Images