Active coke regeneration system

Abstract

The utility model discloses an active coke regeneration system. Comprising a regeneration tower, the regeneration tower comprises a cooling section, the cooling section is connected with a nitrogen circulation unit used for cooling active coke, the nitrogen circulation unit comprises a first nitrogen pipeline, a second nitrogen pipeline and a first heat exchanger, and a thermal medium outlet of the first heat exchanger is connected with a medium inlet of the cooling section through the first nitrogen pipeline; a medium outlet of the cooling section is connected with a heat medium inlet of the first heat exchanger through a second nitrogen pipeline, the first heat exchanger is further connected with a water circulation unit used for nitrogen heat exchange and cooling, and the water circulation unit comprises a water circulation pipeline used for conveying hot water obtained after heat exchange to a conical hopper of the adsorption tower to be heated. A cold medium inlet and outlet of the first heat exchanger are connected with the water circulation pipeline. According to the utility model, the cooling section is connected with the nitrogen circulating unit for cooling the active coke and adopts nitrogen as a cooling medium, so that when the cooling section slightly leaks, the loss of the active coke caused by over-temperature on fire and slow oxidation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization and denitrification, in particular to an activated coke regeneration system. Background Art

[0002] The activated coke desulfurization and denitrification system is mainly divided into two process steps: adsorption process and regeneration process. The adsorption process is to adsorb pollutants in the flue gas containing pollutants into the micropores of the activated coke. The main equipment in the adsorption process is the adsorption tower. The main equipment in the regeneration process is the regeneration tower. In the regeneration tower, the adsorption saturated activated coke absorbs heat and releases pollutants such as sulfides in the micropores of the activated coke. During the regeneration process, the activated coke is subjected to surface heat exchange by burning coal gas in the hot blast furnace in the high temperature section. Normally, in the cooling section of the regeneration system, the activated coke at about 300°C needs to be cooled to 100°C, which will release a large amount of low-grade heat.

[0003] In the existing system, because the medium of the cooling section is air and the regeneration tower operates at negative pressure, if there is a slight leakage in the cooling section during long-term operation, the cooling section may slowly overheat and corrode, affecting the regeneration of activated coke. At the same time, in the adsorption process of the existing activated coke desulfurization and denitrification system, the cone hopper insulation, protective nitrogen heating, and ammonia spray heating all use steam heating or electric heating; and in the regeneration process, in order to maintain the thermal balance of the system, a large amount of heat is released to the outside of the system in the form of medium and high-temperature air as a carrier. This part of the heat is not used, resulting in heat waste. Therefore, in the activated coke desulfurization and denitrification system, integrating the heat of the adsorption process and the regeneration process, maintaining the heat balance of the adsorption system and regeneration, and reducing the heat discharged from the system without adding steam and electric heating are technical problems that need to be solved. Utility Model Content

[0004] In order to solve the above problems, the utility model provides an activated coke regeneration system, including a regeneration tower, the regeneration tower including a cooling section, the cooling section is connected to a nitrogen circulation unit for cooling the activated coke, the nitrogen circulation unit includes a first nitrogen pipeline, a second nitrogen pipeline and a first heat exchanger, the hot medium outlet of the first heat exchanger is connected to the medium inlet of the cooling section through the first nitrogen pipeline, the medium outlet of the cooling section is connected to the hot medium inlet of the first heat exchanger through the second nitrogen pipeline, the first heat exchanger is also connected to a water circulation unit for nitrogen heat exchange and cooling, the water circulation unit includes a water circulation pipeline for transporting hot water after heat exchange to the cone bucket of the adsorption tower for heating, and the cold medium inlet and outlet of the first heat exchanger are respectively connected to the water circulation pipeline.

[0005] Furthermore, a second heat exchanger is connected to the water circulation pipeline, and the hot medium inlet and outlet of the second heat exchanger are respectively connected to the water circulation pipeline, and the hot medium outlet of the second heat exchanger is connected to the cold medium inlet of the first heat exchanger.

[0006] Furthermore, the second heat exchanger is an air cooler, and the cold medium inlet and outlet of the second heat exchanger are respectively connected to the air duct.

[0007] Furthermore, the second nitrogen pipeline is also connected in parallel to a third nitrogen pipeline for conveying hot nitrogen to the nitrogen protection system of the regeneration tower.

[0008] Furthermore, a nitrogen supplement pipeline is connected to the first nitrogen pipeline.

[0009] Furthermore, a water circulation pump is provided on the water circulation pipeline.

[0010] Furthermore, the first nitrogen pipeline is also provided with a first circulation fan.

[0011] Furthermore, the regeneration tower also includes a heating section arranged above the cooling section, the heating section is externally connected to a heating furnace, the flue gas outlet of the heating furnace is connected to the medium inlet of the heating section through a first flue gas duct, and the medium outlet of the heating section is connected to the flue gas inlet of the heating furnace through a second flue gas duct.

[0012] Furthermore, the second flue gas duct is connected in parallel with a third flue gas duct for conveying high-temperature flue gas to the ammonia evaporator.

[0013] Furthermore, the second flue gas duct is also provided with a second circulation fan.

[0014] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0015] 1) In the activated coke regeneration system provided by the utility model, the cooling section is connected to a nitrogen circulation unit for cooling the activated coke. The cooling section uses nitrogen as a cooling medium. When there is a slight leakage in the cooling section, active coke loss caused by overheating and slow oxidation will not occur; and the high-temperature water at the outlet of the first heat exchanger can be used as heat for heat preservation of the cone buckets in the adsorption tower, and it is also achieved that no external energy is required to heat all the cone buckets of the adsorption tower, saving the consumption of energy media and reducing the operating cost of the system.

[0016] 2) The activated coke regeneration system provided by the utility model can recover the waste heat of the cooling section for self-use of protective nitrogen in the nitrogen protection system of the regeneration tower and self-use of gas-sealed nitrogen, thereby achieving heating of the protective nitrogen without the need for external energy, saving the consumption of energy media and reducing the operating cost of the system.

[0017] 3) In the activated coke regeneration system provided by the utility model, the hot flue gas from the heating section of the regeneration tower can be used in the ammonia evaporator for heating the sprayed ammonia gas, which further saves the consumption of energy medium and reduces the system operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic structural diagram of the activated coke regeneration system provided by the utility model.

[0020] 1-regeneration tower; 11-cooling section; 12-heating section; 2-nitrogen circulation unit; 21-first heat exchanger; 22-first nitrogen pipeline; 23-second nitrogen pipeline; 24-third nitrogen pipeline; 25-nitrogen supplement pipeline; 26-first circulation fan; 3-water circulation unit; 31-second heat exchanger; 32-first water pipeline; 33-second water pipeline; 34-third water pipeline; 35-water circulation pump; 4-heating furnace; 5-first flue gas pipeline; 6-second flue gas pipeline; 7-third flue gas pipeline; 8-second circulation fan; 9-regulating valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. In the drawings, the size and relative size of some parts may be enlarged for clarity.

[0022] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the description of the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "center", "horizontal", "vertical", "top", "bottom", "inside" and "outside" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In addition, in the description of the present invention, the terms "first" and "second" are only used to distinguish in the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0025] As the instruction manual Figure 1 As shown, the utility model provides an activated coke regeneration system, including a regeneration tower 1, the regeneration tower 1 includes a cooling section 11, the cooling section 11 is connected to a nitrogen circulation unit 2 for cooling the activated coke, the nitrogen circulation unit 2 includes a first nitrogen pipeline 22, a second nitrogen pipeline 23 and a first heat exchanger 21 for nitrogen heat exchange and cooling, the hot medium outlet of the first heat exchanger 21 is connected to the medium inlet of the cooling section 11 through the first nitrogen pipeline 22, the medium outlet of the cooling section 11 is connected to the hot medium inlet of the first heat exchanger 21 through the second nitrogen pipeline 23, the first heat exchanger 21 is also connected to a water circulation unit 3 for nitrogen heat exchange and cooling, the water circulation unit 3 includes a water circulation pipeline for transporting hot water after heat exchange to the cone bucket heating of the adsorption tower, and the cold medium inlet and outlet of the first heat exchanger 21 are respectively connected to the water circulation pipeline. In this embodiment, nitrogen is introduced into the cooling section 11 through a nitrogen pipeline as a cooling medium, and the activated coke in the cooling section 11 is subjected to heat exchange cooling. The first heat exchanger 21 is used to cool the nitrogen coming out of the cooling section 11. The hot medium in the first heat exchanger 21 refers to nitrogen, and the cold medium in the first heat exchanger 21 refers to water used for heat exchange with nitrogen. The hot water after heat exchange between water and nitrogen comes out from the cold medium outlet of the first heat exchanger 21 and is transported to the cone bucket of the adsorption tower for heating and heat preservation of the cone bucket. The water coming out of the cone bucket is cooled and circulated to the first heat exchanger 21.

[0026] Specifically, after high-temperature activation in the regeneration tower 1, the activated coke is transported to the cooling section 11. In the cooling section 11, the activated coke at 300°C needs to be cooled to 100°C. The cooling section 11 uses nitrogen for circulating cooling. The specific process is that the temperature of the nitrogen coming out of the heat medium outlet of the first heat exchanger 21 is 40-60°C, and it enters the cooling section 11, non-contact heat exchange with the activated coke in the cooling section 11, and the activated coke is cooled. The nitrogen after heat exchange comes out from the medium outlet of the cooling section 11 and enters the first heat exchanger 21 through the second nitrogen pipeline 23 for cooling. The above-mentioned cycle operation is continued to cool the activated coke in the cooling section 11. Using nitrogen as the cooling medium, the entire cooling section 11 is filled with circulating nitrogen, which has a good fire extinguishing effect, and avoids the situation that the 400°C activated coke in the cooling section 11 may spontaneously ignite and oxidize and corrode the heat exchange tubes in the case of slight leakage in the cooling section 11 during long-term operation. Using nitrogen as the cooling medium can prevent the regenerated activated coke from spontaneous combustion while ensuring good cooling of the activated coke.

[0027] In the optimized implementation mode, the first heat exchanger 21 is preferably a water cooler, and the nitrogen is cooled by non-contact heat exchange between cold water and the hot nitrogen coming out of the cooling section 11, so that the nitrogen can be recycled. The water circulation pipeline is also connected to a second heat exchanger 31, and the heat medium inlet and outlet of the second heat exchanger 31 are respectively connected to the water circulation pipeline, and the heat medium outlet of the second heat exchanger 31 is connected to the cold medium inlet of the first heat exchanger 21. The second heat exchanger 31 is used to cool the hot water in the water circulation pipeline, and the cooled water is circulated to the first heat exchanger 21 for heat exchange and cooling of nitrogen; the heat medium of the second heat exchanger 31 refers to water, and the water is heat exchanged and cooled by the cold medium. The specific process is that the water coming out of the second heat exchanger 31 enters the first heat exchanger 21 to exchange heat with nitrogen, and the hot water coming out of the first heat exchanger 21 is transported to the cone bucket insulation pipeline of the adsorption tower through a pipeline for cone bucket heating and insulation, and the cone bucket insulation outlet pipeline is connected to the heat medium inlet of the second heat exchanger 31.

[0028] Specifically, the water circulation pipeline includes a first water pipeline 32, a second water pipeline 33 and a third water pipeline 34. The hot medium outlet of the second heat exchanger 31 is connected to the cold medium inlet of the first heat exchanger 21 through the first water pipeline 32. The cold medium outlet of the first heat exchanger 21 is connected to the hot medium inlet of the second heat exchanger 31 through the second water pipeline 33. The second water pipeline 33 is also connected to a third water pipeline 34 for heating the cone bucket of the adsorption tower. The third water pipeline 34 is connected to the hot medium inlet of the second heat exchanger 31. The high-temperature water from the first heat exchanger 21 can be used as the heat preservation heat for the cone bucket of the adsorption tower and the discharge valve, so that all cone buckets of the adsorption tower can be heated without external energy, saving the consumption of energy medium and reducing the operation cost of the system. Specifically, the cold water from the second heat exchanger 31 enters the first heat exchanger 21, exchanges heat with the hot nitrogen, and cools the nitrogen. The heated water enters the second heat exchanger 31 through the second water pipeline 33 to be cooled and circulated.

[0029] Preferably, the second heat exchanger 31 is an air cooler, and the cold medium inlet and outlet of the second heat exchanger 31 are respectively connected to the air pipe, so that the hot water passing through the second heat exchanger 31 is cooled by the cold air.

[0030] Preferably, the temperature of the nitrogen after heat exchange from the cooling section in the circulation pipeline is controlled to be 100° C. by adjusting the water cooler regulating valve and the air cooler.

[0031] In an optimized implementation mode, the second nitrogen pipeline 23 is also connected to a third nitrogen pipeline 24 for conveying hot nitrogen to the nitrogen protection system of the regeneration tower. Specifically, the third nitrogen pipeline 24 is connected to the nitrogen pipeline for self-use of the regeneration tower. Part of the hot nitrogen coming out of the cooling section 11 can be conveyed to the nitrogen protection system of the regeneration tower through the third nitrogen pipeline 24, and used for self-use of protective nitrogen and self-use of gas-sealed nitrogen, so that no external energy is required to heat the protective nitrogen, thus saving energy medium and reducing the operating cost of the system.

[0032] In an optimized implementation manner, a water circulation pump 35 is provided on the first water pipeline 32 to provide water circulation power.

[0033] In an optimized implementation manner, a nitrogen replenishing pipeline 25 is connected to the first nitrogen pipeline 22 for replenishing nitrogen. A pressure detector can be provided on the first nitrogen pipeline 22 to replenish nitrogen by detecting the nitrogen pressure in the pipeline to maintain the nitrogen amount in the cooling section.

[0034] In an optimized implementation manner, the first nitrogen pipeline 22 is further provided with a first circulation fan 26 for providing nitrogen circulation power.

[0035] In an optimized implementation mode, the regeneration tower 1 also includes a heating section 12 arranged above the cooling section 11, and the heating section 12 is externally connected to a heating furnace 4, and the flue gas outlet of the heating furnace 4 is connected to the medium inlet of the heating section 12 through a first flue gas duct 5, and the medium outlet of the heating section 12 is connected to the flue gas inlet of the heating furnace 4 through a second flue gas duct 6.

[0036] Preferably, the heating furnace 4 is a hot blast furnace. The 500°C high-temperature flue gas generated by burning coal gas in the hot blast furnace enters the regeneration tower from the heating section medium inlet through the first flue gas duct 5. The flue gas after the activated coke is heated in the regeneration tower is discharged from the heating section medium outlet and circulated to the flue gas inlet of the hot blast furnace.

[0037] In an optimized implementation mode, the second flue gas duct 6 is connected to a third flue gas duct 7 for conveying high-temperature flue gas to the ammonia evaporator, and the third flue gas duct is also connected to a branch duct for dispersing hot air. The hot flue gas from the heating section can be used in the ammonia evaporator, used as dilution air for spraying ammonia water for denitrification, and can be used for heating ammonia gas for spraying ammonia. Spraying ammonia water only requires an atomizing spray gun, which can save energy consumption of the ammonia evaporator.

[0038] Preferably, the third flue gas duct 7 is also provided with a regulating valve 9 to control the flue gas flow.

[0039] In an optimized implementation mode, a second circulation fan 8 is further provided on the second flue gas duct 6 to provide power for flue gas circulation.

[0040] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0041] Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been described, it should be understood that the present invention should not be limited to this embodiment, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the attached claims.

Claims

1. An activated coke regeneration system, comprising a regeneration tower, wherein the regeneration tower comprises a cooling section, characterized in that: The cooling section is connected to a nitrogen circulation unit for cooling the activated coke, and the nitrogen circulation unit includes a first nitrogen pipeline, a second nitrogen pipeline and a first heat exchanger. The hot medium outlet of the first heat exchanger is connected to the medium inlet of the cooling section through the first nitrogen pipeline, and the medium outlet of the cooling section is connected to the hot medium inlet of the first heat exchanger through the second nitrogen pipeline. The first heat exchanger is also connected to a water circulation unit for nitrogen heat exchange and cooling. The water circulation unit includes a water circulation pipeline for transporting hot water after heat exchange to the cone bucket of the adsorption tower for heating, and the cold medium inlet and outlet of the first heat exchanger are respectively connected to the water circulation pipeline.

2. The activated coke regeneration system according to claim 1, characterized in that: The water circulation pipeline is also connected to a second heat exchanger, the hot medium inlet and outlet of the second heat exchanger are respectively connected to the water circulation pipeline, and the hot medium outlet of the second heat exchanger is connected to the cold medium inlet of the first heat exchanger.

3. The activated coke regeneration system according to claim 2, characterized in that: The second heat exchanger is an air cooler, and the cold medium inlet and outlet of the second heat exchanger are respectively connected to the air pipeline.

4. The activated coke regeneration system according to claim 1, characterized in that: The second nitrogen pipeline is also connected to a third nitrogen pipeline for conveying hot nitrogen to the nitrogen protection system of the regeneration tower.

5. The activated coke regeneration system according to claim 1, characterized in that: The first nitrogen pipeline is connected to a nitrogen supplement pipeline.

6. The activated coke regeneration system according to claim 1, characterized in that: A water circulation pump is arranged on the water circulation pipeline.

7. The activated coke regeneration system according to claim 1, characterized in that: The first nitrogen pipeline is also provided with a first circulation fan.

8. The activated coke regeneration system according to claim 1, characterized in that: The regeneration tower also includes a heating section arranged above the cooling section, the heating section is externally connected to a heating furnace, the flue gas outlet of the heating furnace is connected to the medium inlet of the heating section through a first flue gas duct, and the medium outlet of the heating section is connected to the flue gas inlet of the heating furnace through a second flue gas duct.

9. The activated coke regeneration system according to claim 8, characterized in that: The second flue gas pipeline is connected to a third flue gas pipeline for conveying high-temperature flue gas to the ammonia evaporator.

10. The activated coke regeneration system according to claim 8, characterized in that: The second flue gas duct is also provided with a second circulation fan.

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