Device for recycling ammonia gas by discharging ammonia water in negative pressure state

Abstract

The utility model discloses a device for recycling ammonia gas by discharging ammonia water in a negative pressure state, relates to the field of desulfurization and denitrification of coke oven flue gas, and solves the problems in the prior art that excessive ammonia gas is absorbed by adopting a water-sealed tank technology, and water absorbing the ammonia gas becomes industrial wastewater or needs to be subjected to secondary treatment. Comprising an ammonia water inlet pipeline and a plurality of ammonia water tanks, one end of the ammonia water inlet pipeline is connected to a water outlet pipeline of an ammonia water tank car, the other end of the ammonia water inlet pipeline is connected to an ammonia water inlet valve, and the other end of the ammonia water inlet valve is connected to a filter; the outlet end of the exhaust communicating pipe is connected to a negative-pressure main flue; the liquid discharge end of the filter is connected to the ammonia unloading pump, and the other end of the ammonia unloading pump is connected to each ammonia water tank. The effects that the phenomena that waste water is generated in the ammonia water unloading process and ammonia gas leaks easily in the ammonia water unloading process are improved, and waste water needing secondary treatment is not generated any more are achieved.

Description

Technical Field

[0001] The utility model relates to the field of coke oven flue gas desulfurization and denitrification, in particular to a device for recovering ammonia gas by unloading ammonia water under negative pressure. Background Art

[0002] As an important raw material in the process of steel smelting, coke not only plays the role of reducing agent and exothermic agent, but also plays the role of material column skeleton in the ironmaking process. With the vigorous development of steel enterprises, the demand for coke has increased, directly driving the development of the entire coking industry. In the coking production process, the flue gas generated by coke oven heating contains SO2 and NO x , which is directly discharged into the atmosphere, will have a serious impact on the environment. Therefore, the SO2 and NO generated in the coke production process x Effective control has become an inevitable task faced by major coking enterprises.

[0003] The development of coke oven flue gas denitrification technology can effectively remove NO x The concentration is reduced to below the national emission standard, thereby reducing pollution to the atmospheric environment. With the development of denitrification technology, the main denitrification technologies at this stage include selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), multi-media filter (DPF), etc. Different denitrification methods have their inherent advantages and disadvantages.

[0004] Selective catalytic reduction (SCR) technology uses a certain concentration of ammonia as a denitrifying agent. Under the action of a certain temperature and catalyst, it uses the reducing property to reduce NO in the flue gas. x Selectively reduce to non-toxic and non-polluting N2 and H2O, so as to achieve the purpose of protecting the environment; SCR denitrification system includes main flue, denitrification reactor (built-in catalyst), ammonia evaporator, hot air furnace, ammonia spray gun, etc. There is an input flue between the main flue and the ammonia evaporator, and the flue gas enters the ammonia evaporator from the main flue and the input flue. The ammonia spray gun is set in the ammonia evaporator and adds ammonia water. The ammonia water is vaporized in the ammonia evaporator under the action of low-pressure steam and flue gas temperature and mixed with the flue gas. The outlet of the ammonia evaporator is provided with an output flue, and then this part of the flue gas finally enters the denitrification reactor through the output flue, and under the action of the catalyst, NO in the flue gas is removed. X In actual operation, many water-sealed tanks are used to absorb excess ammonia. The water that absorbs ammonia will become industrial wastewater and still needs to undergo secondary treatment, which needs to be improved. Utility Model Content

[0005] The utility model aims to provide an ammonia recovery device for unloading ammonia water under negative pressure, thereby improving the problems of wastewater generation and ammonia leakage during ammonia water unloading.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A negative pressure ammonia unloading device for ammonia recovery includes an ammonia inlet pipe and several ammonia tanks. One end of the ammonia inlet pipe is connected to the water outlet pipe of the ammonia tank truck, and the other end is connected to the ammonia inlet valve. The other end of the ammonia inlet valve is connected to the filter.

[0008] The exhaust end of the filter is connected to the emptying valve, the other end of the emptying valve is connected to the exhaust connecting pipe, and the outlet end of the exhaust connecting pipe is connected to the negative pressure main flue; the liquid discharge end of the filter is connected to the ammonia unloading pump, and the other end of the ammonia unloading pump is connected to each ammonia tank.

[0009] By adopting the above technical solution, when unloading ammonia water, the water outlet pipe of the ammonia water tanker is connected to the ammonia water inlet pipe, the ammonia water inlet manual valve is opened, and the tanker outlet valve is not opened separately, and ammonia water slowly enters the pipeline. At this time, the emptying valve on the filter is opened to discharge the air in the pipeline. After there is no air in the pipeline, the ammonia unloading pump is started, and the water outlet valve of the tanker is fully opened to start unloading ammonia water. No wastewater will be generated and no ammonia gas will leak into the atmosphere to pollute the atmosphere.

[0010] Furthermore, one end of the main flue is connected to a denitration reactor.

[0011] By adopting the above technical solution, ammonia is mixed with flue gas and finally enters the denitrification reactor through the flue. Under the action of the catalyst, NO in the flue gas is denitrated. X Reduction is carried out to achieve the purpose of denitrification.

[0012] Furthermore, the end of the main flue away from the denitration reactor is connected to the dust removal system, and the exhaust connecting pipe is located between the dust removal system and the denitration reactor.

[0013] By adopting the above technical solution, during the coking production process, the flue gas collected by the dust removal system contains SO2 and NO x After entering the flue, it mixes with ammonia and passes through the denitrification reactor to achieve the purpose of denitrification.

[0014] Furthermore, a one-way valve is provided on the exhaust connecting pipe, and the direction of the one-way valve allows the medium to pass only toward the main flue.

[0015] By adopting the above technical solution, situations such as smoke backflow can be avoided.

[0016] Furthermore, a manual valve is provided on the exhaust connecting pipe.

[0017] By adopting the above technical solution, manual disconnection or connection between ammonia and flue gas is facilitated.

[0018] Furthermore, an electric regulating valve is provided on the exhaust connecting pipe.

[0019] By adopting the above technical solution, the automatic disconnection or connection between ammonia and flue gas is facilitated.

[0020] Furthermore, the top of the ammonia water tank is connected to an ammonia absorption pipeline, and the other end of the ammonia absorption pipeline is connected to an exhaust connecting pipe.

[0021] By adopting the above technical solution, the main flue is in a negative pressure state, so that the ammonia tank is also in a negative pressure state. At this time, when the ammonia truck unloads ammonia into the ammonia tank, the excess ammonia in the ammonia tank will be sucked into the main flue.

[0022] Furthermore, the ammonia water inlet valve is a manual valve.

[0023] By adopting the above technical solution, manual control of ammonia water into the ammonia water inlet pipe and the negative pressure ammonia water unloading device is facilitated.

[0024] In summary, the present invention has the following beneficial effects:

[0025] 1. Because the main flue is in a negative pressure state, when the manual valves and electric regulating valves on the newly added pipeline are all open, the ammonia tank is also in a negative pressure state. At this time, when the ammonia truck unloads ammonia into the ammonia tank, the excess ammonia in the ammonia tank will be sucked into the main flue. Before the ammonia truck is unloaded and when the ammonia unloading pump is emptied, no pollutants will be emitted into the atmosphere;

[0026] 2. After using this device, ammonia unloading will no longer produce wastewater that requires secondary treatment;

[0027] 3. The device of the present application can regulate the pressure inside the ammonia tank, so that the pressure inside the ammonia tank is always at an ideal pressure. The pressure of the ammonia tank is stable, which can increase the service life of the tank and maintain the stability of the outlet ammonia flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 The utility model is a schematic diagram of the overall structure of a device for unloading ammonia water and solving ammonia gas recovery in a negative pressure state.

[0030] In the figure, 1. Dust removal system; 2. Denitrification reactor; 3. Main flue; 4. One-way valve; 5. Manual valve; 6. Electric regulating valve; 7. Ammonia tank; 8. Ammonia unloading pump; 9. Filter; 10. Drain valve; 11. Ammonia inlet valve. DETAILED DESCRIPTION

[0031] The following is a further description of the specific embodiments of the present invention in conjunction with the accompanying drawings, which do not limit the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] A negative pressure state ammonia water unloading solution ammonia recovery device, such as Figure 1 As shown, it includes an ammonia inlet pipe and several ammonia tanks 7. One end of the ammonia inlet pipe is connected to the water outlet pipe of the ammonia tank 7, and the other end is connected to the ammonia inlet valve 11 (the ammonia inlet valve 11 is a manual valve). The other end of the ammonia inlet valve 11 is connected to the filter 9.

[0033] The exhaust end of the filter 9 is connected to the exhaust valve 10, the other end of the exhaust valve 10 is connected to the exhaust connecting pipe, and the other end of the exhaust connecting pipe is connected to the negative pressure main flue 3;

[0034] The discharge end of the filter 9 is connected to the ammonia unloading pump 8, the other end of the ammonia unloading pump 8 is connected to each ammonia water tank 7, the top of the ammonia water tank 7 is connected to the ammonia absorption pipeline, and the other end of the ammonia absorption pipeline is connected to the exhaust connecting pipe.

[0035] One end of the main flue 3 is connected to the denitration reactor 2, and the other end is connected to the dust removal system 1. The connection position of the exhaust connecting pipe and the main flue 3 is located between the dust removal system 1 and the denitration reactor;

[0036] Starting from one end close to the main flue 3, the exhaust connecting pipe is provided with a one-way valve 4, a manual valve 5 and an electric regulating valve 6 in sequence. The direction of the one-way valve 4 allows the medium to pass only in the direction of the main flue 3; when the manual valve 5 and the electric regulating valve 6 are all in the open state, the ammonia tank 7 is also in a negative pressure state. At this time, when the ammonia truck unloads ammonia into the ammonia tank 7, the excess ammonia gas in the ammonia tank 7 will be sucked into the main flue 3.

[0037] During normal unloading of ammonia water, the outlet pipe of the ammonia water tanker 7 is connected to the ammonia water inlet pipe, the ammonia water inlet manual valve (ammonia water inlet valve 11) is opened, and the outlet valve of the tanker is opened 1 / 3, so that ammonia water slowly enters the pipe. At this time, the drain valve 10 on the filter 9 is opened to discharge the air in the pipe into the main flue 3;

[0038] After there is no air in the pipeline, start the ammonia unloading pump 8, fully open the water outlet valve of the tank truck, and start unloading ammonia water.

[0039] Working principle:

[0040] The main flue 3 is connected to the ammonia absorption pipe on the top of the ammonia tank 7. This section of the pipe is designed with a one-way valve 4, a manual valve 5, and an electric regulating valve 6. The correct installation direction of the one-way valve 4 should be from the ammonia tank 7 to the main flue.

[0041] Because the flue is in a negative pressure state, when the manual valve 5 and the electric regulating valve 6 on the newly added pipeline are all in the open state, the ammonia tank 7 is also in a negative pressure state. At this time, when the ammonia truck unloads ammonia into the ammonia tank 7, the excess ammonia gas in the ammonia tank 7 will be sucked into the flue;

[0042] Connect a section of pipe to the ammonia absorption pipe to the discharge of the ammonia unloading pump 8, so that the ammonia discharged from the pipe before the ammonia unloading will also be sucked into the flue. During the whole ammonia unloading process, the ammonia tank 7 will maintain a negative pressure state, thereby preventing ammonia leakage;

[0043] By adopting the above technical solution, no matter whether the ammonia pump 8 is emptied before unloading the ammonia water or during the unloading process, no waste water will be generated and no ammonia gas will leak into the atmosphere to pollute the atmosphere, which is highly practical.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be deemed to fall within the protection scope of the technical solution of the present invention.

Claims

1. A negative pressure ammonia water unloading and ammonia recovery device, characterized by: It includes an ammonia inlet pipe and several ammonia tanks. One end of the ammonia inlet pipe is connected to the water outlet pipe of the ammonia tank truck, and the other end is connected to the ammonia inlet valve. The other end of the ammonia inlet valve is connected to the filter. The exhaust end of the filter is connected to the emptying valve, the other end of the emptying valve is connected to the exhaust connecting pipe, and the outlet end of the exhaust connecting pipe is connected to the negative pressure main flue; the liquid discharge end of the filter is connected to the ammonia unloading pump, and the other end of the ammonia unloading pump is connected to each ammonia tank.

2. The negative pressure ammonia water unloading and ammonia gas recovery device according to claim 1, characterized in that: One end of the main flue is connected to the denitration reactor.

3. The negative pressure ammonia water unloading and ammonia gas recovery device according to claim 2, characterized in that: The main flue is connected to the dust removal system at one end away from the denitration reactor, and the exhaust connecting pipe is located between the dust removal system and the denitration reactor.

4. The negative pressure ammonia water unloading and ammonia gas recovery device according to claim 1, characterized in that: A one-way valve is provided on the exhaust connecting pipe, and the direction of the one-way valve allows the medium to pass only toward the main flue.

5. The negative pressure ammonia unloading and ammonia recovery device according to claim 1 or 4, characterized in that: The exhaust connecting pipe is provided with a manual valve.

6. The negative pressure ammonia unloading and ammonia recovery device according to claim 1 or 4, characterized in that: An electric regulating valve is provided on the exhaust communicating pipe.

7. The negative pressure ammonia water unloading and ammonia gas recovery device according to claim 1, characterized in that: The top of the ammonia water tank is connected to an ammonia absorption pipeline, and the other end of the ammonia absorption pipeline is connected to an exhaust connecting pipe.

8. The negative pressure ammonia water unloading and ammonia gas recovery device according to claim 1, characterized in that: The ammonia water inlet valve is a manual valve.

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