Automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater

Abstract

The utility model relates to the field of ammonium nitrate production processes, in particular to an automatic mixing system for RO (reverse osmosis) membrane treatment of ammonium nitrate process wastewater. The system comprises a mixer raw water tank (1), a raw water pump (2), a mixer (3), an RO membrane permeation device (5), a water production tank (6) and a water production pump (7), the raw water tank (1) is respectively connected with the mixer (2) and the RO membrane permeation device (5) through the raw water pump (2); the RO membrane permeation device (5) is connected with a water production tank (6); and the water producing tank (6) is respectively connected with the raw water tank (1) and the mixer (3) through a water producing pump (7). By adopting the system disclosed by the utility model, the problems in the prior art can be effectively solved, and the effect of automatically mixing raw water and produced water is achieved; the index of the raw water entering the RO membrane permeation device is always within the treatment capacity, so that the continuous normal operation of the RO membrane permeation device is realized.

Description

Technical Field

[0001] The utility model relates to the field of ammonium nitrate production technology, in particular to an automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater. Background Art

[0002] Ammonium nitrate is a commonly used nitrogen fertilizer with the characteristics of high efficiency, rapidity and stability, and is widely used in agricultural production.

[0003] There are many methods for preparing ammonium nitrate, and the following two methods are commonly used:

[0004] 1. Preparation of ammonium nitrate by ammonia method

[0005] The ammonia method is a commonly used method for preparing ammonium nitrate. Its basic principle is to react ammonia with nitric acid to produce ammonium nitrate. The specific steps are as follows:

[0006] (1) Ammonia gas is passed into nitric acid to produce ammonium nitrate.

[0007] NH 3 +HNO 3 →NH 4 NO 3

[0008] (2) The reaction solution is heated to evaporate and concentrate it.

[0009] (3) Cooling and crystallizing the ammonium nitrate to obtain pure ammonium nitrate crystals.

[0010] 2. Preparation of ammonium nitrate by reaction of nitric acid and ammonium salt

[0011] The reaction of nitric acid and ammonium salt is another commonly used method for preparing ammonium nitrate. The basic principle is to react nitric acid with ammonium salt to generate ammonium nitrate. The specific steps are as follows:

[0012] (1) Mix nitric acid and ammonium salt to react and generate ammonium nitrate.

[0013] NH 4 Cl+HNO 3 →NH4NO 3 +HCl

[0014] (2) The reaction solution is heated to evaporate and concentrate it.

[0015] (3) Cooling and crystallizing the concentrated liquid to obtain pure ammonium nitrate crystals.

[0016] Regardless of the ammonium nitrate production process, there is a heating evaporation and concentration process, which will produce process condensed wastewater. If there are various reasons such as start-up and shutdown, load fluctuation, instrument failure, etc., a large amount of process wastewater containing ammonia nitrogen and conductivity exceeding the index will be generated. This situation will cause the conductivity of the water produced by the membrane permeation device to exceed the index, and the chemical water station cannot be recycled. It will also reduce the service life of the RO membrane of the membrane permeation device. Utility Model Content

[0017] The purpose of the utility model is to provide an automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater in response to the problem that the ammonia nitrogen and conductivity of the raw water exceed the processing capacity of the RO membrane permeation device. Through this system, the ammonia nitrogen and conductivity indicators of the raw water can be better within the processing capacity of the membrane permeation device.

[0018] In order to achieve the purpose of the above utility model, the specific technical solution of the utility model is as follows:

[0019] An automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater, the system comprises a mixer raw water tank, a raw water pump, a mixer, an RO membrane permeation device, a water production tank and a water production pump; the raw water tank and the raw water pump are respectively connected to the mixer and the RO membrane permeation device; the RO membrane permeation device is connected to the water production tank; the water production tank is respectively connected to the raw water tank and the mixer through the water production pump.

[0020] As a better implementation in the present application, a conductivity meter is arranged at the outlet of the mixer.

[0021] As a better implementation method in the present application, a raw water automatic regulating valve is provided on the pipeline connecting the raw water pump and the mixer.

[0022] As a better implementation method in the present application, a pipeline check valve and a water production automatic regulating valve are sequentially arranged on the pipeline connecting the water production pump and the mixer.

[0023] As a better implementation method in the present application, the water production pump is connected to the chemical water station.

[0024] As a better implementation in the present application, a filter is provided on the pipeline between the raw water pump and the mixer; the accuracy of the filter can be adjusted as needed, and the more preferred accuracy of the filter is 1μ.

[0025] As a better implementation in the present application, the conductivity meter is made of acid and alkali corrosion resistant material; the maximum range is 12000 us / cm.

[0026] As a better implementation method in the present application, the automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater also includes a control system; the raw water automatic regulating valve, the produced water automatic regulating valve and the conductivity meter are all connected to the control system (conventional technology, not repeated here), and the linkage automatic adjustment of the produced water regulating valve-raw water regulating valve-conductivity meter is done well.

[0027] Before the ammonium nitrate process wastewater enters the reverse osmosis membrane (RO membrane) filtration separation and concentration integrated technology device (referred to as the membrane osmosis device), it is collectively referred to as membrane osmosis raw water. There is a raw water tank in the membrane osmosis device area. The process wastewater sent from the ammonium nitrate device first enters the raw water tank and is then pumped to the membrane osmosis device system by the feed pump.

[0028] This reverse osmosis membrane (RO membrane) filtration separation and concentration integrated technology device has certain requirements for the ammonia nitrogen content and conductivity index of the raw water (NH 3 -N<3000mg / l;conductance<8000us / cm). Ammonia nitrogen and conductivity index are in direct proportion, so the subsequent utility model only considers conductivity).

[0029] The water treated by the device is collectively called membrane permeation water. The produced water enters a water production tank in the membrane permeation device area. The normal conductivity index of the produced water is <50us / cm. Then the produced water is pumped to the water treatment station for recovery.

[0030] Automatic linkage adjustment is achieved through the control system. When the raw water conductivity after the mixer is normal (conductivity meter data <8000us / cm), the raw water regulating valve remains fully open automatically, and the produced water regulating valve remains fully closed automatically. When the conductivity meter data gradually >8000us / cm. The produced water regulating valve begins to open slowly and automatically, and the raw water regulating valve begins to close slowly and automatically. At this time, automatic linkage adjustment is achieved. When the produced water regulating valve opens to 10%, the raw water regulating valve closes 10%, and so on. Until the conductivity is less than 8000us / cm. At this time, reverse linkage begins, the raw water regulating valve begins to open slowly and automatically, and the produced water regulating valve begins to close slowly and automatically. This automatic linkage adjustment process ensures that the conductivity of the raw water entering the membrane permeation is always less than 8000us / cm, which is within the processing capacity of the membrane permeation device.

[0031] Compared with the existing technology, the beneficial effects of the utility model are:

[0032] If the system described in the utility model is not adopted, when the ammonia nitrogen and conductivity of the raw water exceed the index, the RO membrane permeation device can only be stopped immediately, and then the produced water is poured into the raw water tank for mixing. The RO membrane permeation device can only be operated after the raw water index is qualified, so the continuous operation of the RO membrane permeation device cannot be achieved; it is also necessary to manually change the valve on site and perform manual analysis; and it is limited by the liquid level of the raw water tank and the produced water tank; after adopting this system, this problem can be effectively solved, and the effect of automatic mixing of raw water and produced water can be achieved; the raw water index entering the RO membrane permeation device is always within the processing capacity, and the continuous and normal operation of the RO membrane permeation device can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of an automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater described in the utility model;

[0034] Figure numerals: 1 - raw water tank, 2 - raw water pump, 3 - mixer, 4 - conductivity meter, 5 - RO membrane permeation device, 6 - water production tank, 7 - water production pump. DETAILED DESCRIPTION

[0035] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0037] Example:

[0038] An automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater, the structural schematic diagram of which is shown in Figure 1 As shown, the system includes a mixer raw water tank 1, a raw water pump 2, a mixer 3, an RO membrane permeation device 5, a water production tank 6 and a water production pump 7; the raw water tank 1 is connected to the mixer 2 and the RO membrane permeation device 5 respectively through the raw water pump 2; the RO membrane permeation device 5 is connected to the water production tank 6; the water production tank 6 is connected to the raw water tank 1 and the mixer 3 respectively through the water production pump 7.

[0039] Furthermore, a conductivity meter 4 is arranged at the outlet of the mixer 3 .

[0040] Furthermore, a raw water automatic regulating valve is provided on the pipeline connecting the raw water pump 2 and the mixer 3 .

[0041] Furthermore, a pipeline check valve and a water production automatic regulating valve are sequentially arranged on the pipeline connecting the water production pump 7 and the mixer 3 .

[0042] Furthermore, the water production pump 7 is connected to the water treatment station.

[0043] Furthermore, a filter 8 is provided on the pipeline between the raw water pump 2 and the mixer 3; the precision of the filter 8 can be adjusted as required, and more preferably the precision of the filter 8 is 1μ.

[0044] Furthermore, the conductivity meter 4 is made of acid and alkali corrosion resistant material; the maximum measuring range is 12000 us / cm.

[0045] As a better implementation method in the present application, the automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater also includes a control system; the raw water automatic regulating valve, the produced water automatic regulating valve and the conductivity meter are all connected to the control system (conventional technology, not repeated here), and the linkage automatic adjustment of the produced water regulating valve-raw water regulating valve-conductivity meter 4 is done well.

[0046] The specific operation process is as follows:

[0047] Connect the regulating valve and conductivity meter 4 to the central control room (control device, existing technology, no further description), and make good linkage automatic adjustment logic of (water production regulating valve--raw water regulating valve--conductivity meter 4). (Water production regulating valve--raw water regulating valve--conductivity meter 4) realizes automatic linkage adjustment in the central control room. When the conductivity of the raw water after the mixer 3 is normal (conductivity meter data <8000us / cm), the raw water regulating valve remains automatically fully open, and the water production regulating valve remains automatically fully closed. When the data of the conductivity meter 4 gradually >8000us / cm. The water production regulating valve begins to open slowly and automatically, and the raw water regulating valve begins to close slowly and automatically. At this time, automatic linkage adjustment is realized. When the water production regulating valve opens to 10%, the raw water regulating valve closes 10%, and so on. Until the conductivity is less than 8000us / cm. At this time, reverse linkage begins, the raw water regulating valve begins to open slowly and automatically, and the water production regulating valve begins to close slowly and automatically. This automatic linkage adjustment process ensures that the conductivity of the raw water entering the membrane permeation is always less than 8000us / cm, so that the raw water index entering the RO membrane permeation device 5 is always within the processing capacity, thereby achieving continuous and normal operation of the RO membrane permeation device 5.

[0048] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

[0049] This background technology section is provided to generally present the context of the present invention, and the work of the currently named inventor, the work to the extent described in this background technology section, and aspects of the description in this section that did not constitute prior art at the time of application are neither explicitly nor implicitly admitted to be prior art of the present invention.

Claims

1. An automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater, characterized in that: The system comprises a mixer raw water tank (1), a raw water pump (2), a mixer (3), an RO membrane permeation device (5), a water production tank (6) and a water production pump (7); the raw water tank (1) is connected to the mixer (3) and the RO membrane permeation device (5) respectively through the raw water pump (2); the RO membrane permeation device (5) is connected to the water production tank (6); and the water production tank (6) is connected to the raw water tank (1) and the mixer (3) respectively through the water production pump (7).

2. The automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater according to claim 1, characterized in that: A conductivity meter (4) is provided at the outlet of the mixer (3).

3. The automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater according to claim 1, characterized in that: A raw water automatic regulating valve is arranged on the pipeline connecting the raw water pump (2) and the mixer (3).

4. The automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater according to claim 1, characterized in that: A pipeline check valve and a water production automatic regulating valve are sequentially arranged on the pipeline connecting the water production pump (7) and the mixer (3).

5. The automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater according to claim 1, characterized in that: The water production pump (7) is connected to the water treatment station.

6. The automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater according to claim 1, characterized in that: The mixer (3) is a liquid-liquid mixer.

7. The automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater according to claim 1, characterized in that: A filter (8) is provided on the pipeline between the raw water pump (2) and the mixer (3).

8. The automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater according to claim 7, characterized in that: The filter (8) has a precision of 1 μ.

9. The automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater according to claim 2, characterized in that: The conductivity meter (4) is made of acid and alkali corrosion resistant material.

10. The automatic mixing system for RO membrane treatment of ammonium nitrate process wastewater according to claim 2, characterized in that: The conductivity meter (4) has a maximum range of 12000 us / cm.

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