Unattended urea solution preparation method

Abstract

The invention discloses an unattended urea solution preparation method, the control logic is as follows: (1) when the liquid level of a raw water tank Tow1 or a raw water tank Tow2 is higher than 20% and the liquid level of a softened water tank Tsw1 or a softened water tank Tsw2 is lower than 40%, primary water treatment equipment EWT1 is put into operation; (2) when the liquid level of the raw water tank Tow1 and the liquid level of the raw water tank Tow2 are lower than 20% of the liquid level, the first-stage water treatment equipment EWT1 stops running; (3) when the liquid level of the softened water tank Tsw1 or the softened water tank Tsw2 is higher than 20% of the liquid level and the liquid level of the pure water tank Tpw is lower than 40% of the liquid level, the secondary water treatment equipment EWT2 is put into operation; (4) when the liquid level of the softened water tank Tsw1 and the liquid level of the softened water tank Tsw2 are lower than 20% of the liquid level, the secondary water treatment equipment EWT2 stops running; according to the unattended urea solution preparation method, timely water treatment and urea solution preparation are achieved, the instant consumption requirement is met, equipment operates according to consumption, the labor cost is reduced, and the equipment utilization rate and the operation economy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of urea solution production, and in particular to an unattended urea solution preparation method. Background Art

[0002] In recent years, relevant organizations have formulated increasingly stringent diesel engine emission regulations. In order to reduce NOx emissions in diesel engine exhaust and improve air pollution, the Selective Catalytic Reduction (SCR) system has been widely used in diesel engines. By injecting urea solution into the exhaust pipe, NOx is decomposed under the action of the catalyst in the SCR reactor, thereby reducing exhaust pollutant emissions.

[0003] Normally, the urea solution used in the SCR system is a purchased finished product. However, in remote mountainous areas, the finished urea solution cannot be stored for a long time, and the local water quality is poor. Therefore, the construction site needs to have its own two-stage water treatment equipment and urea solution preparation equipment. The soft water after the first-level water treatment is supplied to various water points in the power station diesel engine cooling system and the second-level water treatment. The pure water after the second-level water treatment is used for the preparation of urea solution.

[0004] At present, water treatment equipment generally adopts flow control method, that is, the water production and urea solution preparation amount are set in the control cabinet, and the flow is monitored by the flow meter to control the start and stop of the water treatment equipment and urea solution preparation equipment. Due to the large number of water points on the construction site, the consumption of soft water, pure water and urea solution is different. The above method is prone to problems such as untimely water production and urea solution preparation or excessive tank filling, and different water production amounts need to be set manually, which is extremely inconvenient in actual use. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide an unattended urea solution preparation method, so as to realize timely water treatment and urea solution preparation, meet the immediate consumption needs, enable the equipment to operate according to consumption, reduce labor costs, improve equipment utilization and operation economy, and effectively solve the problems in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: an unattended urea solution preparation method, the control logic is as follows:

[0007] (1) Raw water tank T ow1 Or raw water tank T ow2 The liquid level is higher than 20% level and the soft water tank T sw1 Or soft water tank T sw2 When the liquid level is lower than 40%, the primary water treatment equipment E WT1 Put into operation;

[0008] (2) Raw water tank T ow1 And raw water tank T ow2When the liquid level is below 20%, the primary water treatment equipment E WT1 Stop operation;

[0009] (3) Soft water tank T sw1 Or soft water tank T sw2 The liquid level is higher than 20% level and the pure water tank T pw When the liquid level is below 40%, the secondary water treatment equipment E WT2 Put into operation;

[0010] (4) Soft water tank T sw1 and soft water tank T sw2 When the liquid level is below 20%, the secondary water treatment equipment E WT2 Stop operation;

[0011] (5) Pure water tank T pw The liquid level is higher than 20% and the urea solution storage tank T us The liquid level is lower than 40% and the urea solution preparation reactor R us When the liquid level is lower than 40%, the pure water delivery pump group P pw Put into operation, to the preparation kettle R us Add pure water and prepare kettle R us The heating tube starts heating;

[0012] (6) Pure water tank T pw The liquid level is lower than 20% and the urea solution preparation reactor R us When the liquid level is higher than 90%, the pure water delivery pump group P pw Stop running, automatic feeder C on Put into operation, to urea preparation reactor R us A fixed amount of urea granules is input, and the agitator of the urea preparation kettle is put into operation;

[0013] (7) Urea preparation reactor R us When the stirring time reaches a set value, the stirrer stops working and outputs a preparation completion switch signal at the same time;

[0014] (8) Urea solution delivery pump group P us Receive the switch signal and put it into operation;

[0015] (9) Urea solution preparation reactor R us When the liquid level is lower than 20%, the urea solution delivery pump group P us Stop running.

[0016] As a preferred technical solution of the present invention, in the raw water tank T ow1 , Raw water tank T ow2 , Soft water tank T sw1 , Soft water tank T sw220% liquid level switch, 40% liquid level switch and 90% liquid level switch are configured in the pure water tank and urea solution storage tank, and 20% liquid level switch, 90% liquid level switch, heating tube and agitator are configured in the urea solution preparation kettle.

[0017] As a preferred technical solution of the present invention, the raw water tank T ow1 , Raw water tank T ow2 , Soft water tank T sw1 , Soft water tank T sw2 In the pure water tank and urea solution storage tank, the 20% liquid level switch is the effective liquid level, the 40% liquid level switch is the available liquid level, and the 90% liquid level switch is the full liquid level. In the urea solution preparation kettle, the 20% liquid level switch is the effective liquid level, and the 90% liquid level switch is the full liquid level.

[0018] As a preferred technical solution of the present invention, in the logic (2), when the soft water tank T sw1 Or soft water tank T sw2 When the liquid level is higher than 90%, the primary water treatment equipment E WT1 Also stopped running.

[0019] As a preferred technical solution of the present invention, in the logic (4), when the pure water tank T pw Liquid level is higher than 90% level, secondary water treatment equipment E WT2 Also stopped running.

[0020] As a preferred technical solution of the present invention, the preparation reactor R in the logic (5) us The heating temperature of the heating tube is between 35°C and 40°C.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the unattended urea solution preparation method adopts a liquid level automatic control strategy, realizes unattended operation, reduces labor costs, and not only solves the timeliness problem of water treatment and urea solution preparation when the consumption of soft water, pure water and urea solution is not synchronized, but also maintains the effective storage capacity and improves the equipment utilization rate, and can prevent the equipment from idling and being damaged due to liquid extraction, thereby meeting the safety requirements of equipment operation and improving the convenience of urea solution preparation in highland remote areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the system of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0024] The present invention provides a technical solution: an unattended urea solution preparation method, the equipment includes a raw water tank T ow1 , Raw water tank T ow2 , Raw water delivery pump group P ow , primary water treatment equipment E WT1 , Soft water tank T sw1 , Soft water tank T sw2 , Secondary water treatment equipment E WT2 , Pure water tank T pw , Pure water delivery pump group P pw 、Urea solution preparation reactor R us 、Urea solution delivery pump group P us 、Urea solution storage tank T us , Automatic feeding machine C on ;

[0025] Among them, the raw water tank T ow1 And raw water tank T ow2 For storing raw water;

[0026] Raw water delivery pump group P ow Used to transport raw water to the primary water treatment equipment WT1;

[0027] The primary water treatment equipment WT1 is used to prepare soft water;

[0028] Soft water tank T sw1 and soft water tank T sw2 Store soft water for delivery to various water points in the diesel engine cooling system and the secondary water treatment equipment WT2;

[0029] The secondary water treatment equipment WT2 is used to prepare pure water;

[0030] Pure water tank T pw Used to store pure water;

[0031] Pure water delivery pump group P pw Used to transport pure water to urea solution preparation reactor R us , urea solution preparation reactor R us Used for heating and stirring pure water and urea granules;

[0032] Urea solution delivery pump group P us Used to transport urea solution, urea solution storage tank Tus Used to store urea solution;

[0033] Automatic feeding machine C on Used to transport urea granules to the urea solution preparation reactor us .

[0034] In the original water tank T ow1 , Raw water tank T ow2 , Soft water tank T sw1 , Soft water tank T sw2 20% liquid level switch, 40% liquid level switch and 90% liquid level switch are configured in the pure water tank and urea solution storage tank, and 20% liquid level switch, 90% liquid level switch, heating tube and agitator are configured in the urea solution preparation kettle;

[0035] Raw water tank T ow1 , Raw water tank T ow2 , Soft water tank T sw1 , Soft water tank T sw2 In the pure water tank and urea solution storage tank, the 20% liquid level switch is the effective liquid level, the 40% liquid level switch is the available liquid level, and the 90% liquid level switch is the full liquid level. In the urea solution preparation kettle, the 20% liquid level switch is the effective liquid level, and the 90% liquid level switch is the full liquid level.

[0036] Its control logic is as follows:

[0037] (1) Raw water tank T ow1 Or raw water tank T ow2 The liquid level is higher than 20% level and the soft water tank T sw1 Or soft water tank T sw2 When the liquid level is lower than 40%, the primary water treatment equipment E WT1 Put into operation;

[0038] (2) Raw water tank T ow1 And raw water tank T ow2 The liquid level is below 20% level,

[0039] Or, soft water tank T sw1 Or soft water tank T sw2 When the liquid level is higher than 90%,

[0040] Primary water treatment equipment E WT1 Stop operation;

[0041] (3) Soft water tank T sw1 Or soft water tank T sw2 The liquid level is higher than 20% level and the pure water tank T pw When the liquid level is below 40%, the secondary water treatment equipment E WT2 Put into operation;

[0042] (4) Soft water tank Tsw1 and soft water tank T sw2 The liquid level is below 20% level,

[0043] Or, pure water tank T pw When the liquid level is higher than 90%,

[0044] Secondary water treatment equipment E WT2 Stop operation;

[0045] (5) Pure water tank T pw The liquid level is higher than 20% and the urea solution storage tank T us The liquid level is lower than 40% and the urea solution preparation reactor R us When the liquid level is lower than 40%, the pure water delivery pump group P pw Put into operation, to the preparation kettle R us Add pure water and prepare kettle R us The heating tube starts heating, and the temperature is controlled at 35℃~40℃;

[0046] (6) Pure water tank T pw The liquid level is lower than 20% and the urea solution preparation reactor R us When the liquid level is higher than 90%, the pure water delivery pump group P pw Stop running, automatic feeder C on Put into operation, to urea preparation reactor R us A fixed amount of urea granules is input, and the agitator of the urea preparation kettle is put into operation;

[0047] (7) Urea preparation reactor R us When the stirring time reaches a set value, the stirrer stops working and outputs a preparation completion switch signal at the same time;

[0048] (8) Urea solution delivery pump group P us Receive the switch signal and put it into operation;

[0049] (9) Urea solution preparation reactor R us When the liquid level is lower than 20%, the urea solution delivery pump group P us Stop running.

[0050] In the original water tank T ow1 , Raw water tank T ow2 , Soft water tank T sw1 , Soft water tank T sw2 20% liquid level switch, 40% liquid level switch and 90% liquid level switch are configured in the pure water tank and urea solution storage tank, and 20% liquid level switch, 90% liquid level switch, heating tube and agitator are configured in the urea solution preparation kettle.

[0051] Raw water tank T ow1 , Raw water tank T ow2, Soft water tank T sw1 , Soft water tank T sw2 In the pure water tank and urea solution storage tank, the 20% liquid level switch is the effective liquid level, the 40% liquid level switch is the available liquid level, and the 90% liquid level switch is the full liquid level. In the urea solution preparation kettle, the 20% liquid level switch is the effective liquid level, and the 90% liquid level switch is the full liquid level.

[0052] The present invention solves the problem of timeliness of water treatment and urea solution preparation when the consumption of soft water, pure water and urea solution is not synchronized. It does not require manual control and is suitable for use at construction sites with many water points, greatly improving the convenience of use.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An unattended urea solution preparation method, characterized in that: The control logic is as follows: (1) Raw water tank T ow1 Or raw water tank T ow2 The liquid level is higher than 20% level and the soft water tank T sw1 Or soft water tank T sw2 When the liquid level is lower than 40%, the primary water treatment equipment E WT1 Put into operation; (2) Raw water tank T ow1 And raw water tank T ow2 When the liquid level is below 20%, the primary water treatment equipment E WT1 Stop operation; (3) Soft water tank T sw1 Or soft water tank T sw2 The liquid level is higher than 20% level and the pure water tank T pw When the liquid level is below 40%, the secondary water treatment equipment E WT2 Put into operation; (4) Soft water tank T sw1 and soft water tank T sw2 When the liquid level is below 20%, the secondary water treatment equipment E WT2 Stop operation; (5) Pure water tank T pw The liquid level is higher than 20% and the urea solution storage tank T us The liquid level is lower than 40% and the urea solution preparation reactor R us When the liquid level is lower than 40%, the pure water delivery pump group P pw Put into operation, to the preparation kettle R us Add pure water and prepare kettle R us The heating tube starts heating; (6) Pure water tank T pw The liquid level is lower than 20% and the urea solution preparation reactor R us When the liquid level is higher than 90%, the pure water delivery pump group P pw Stop running, automatic feeder C on Put into operation, to urea preparation reactor R us A fixed amount of urea granules is input, and the agitator of the urea preparation kettle is put into operation; (7) Urea preparation reactor R us When the stirring time reaches a set value, the stirrer stops working and outputs a preparation completion switch signal at the same time; (8) Urea solution delivery pump group P us Receive the switch signal and put it into operation; (9) Urea solution preparation reactor R us When the liquid level is lower than 20%, the urea solution delivery pump group P us Stop running.

2. The unattended urea solution preparation method according to claim 1, characterized in that: In the original water tank T ow1 , Raw water tank T ow2 , Soft water tank T sw1 , Soft water tank T sw2 20% liquid level switch, 40% liquid level switch and 90% liquid level switch are configured in the pure water tank and urea solution storage tank, and 20% liquid level switch, 90% liquid level switch, heating tube and agitator are configured in the urea solution preparation kettle.

3. The unattended urea solution preparation method according to claim 1, characterized in that: The raw water tank T ow1 , Raw water tank T ow2 , Soft water tank T sw1 , Soft water tank T sw2 In the pure water tank and urea solution storage tank, the 20% liquid level switch is the effective liquid level, the 40% liquid level switch is the available liquid level, and the 90% liquid level switch is the full liquid level. In the urea solution preparation kettle, the 20% liquid level switch is the effective liquid level, and the 90% liquid level switch is the full liquid level.

4. The unattended urea solution preparation method according to claim 1, characterized in that: In the logic (2), when the soft water tank T sw1 Or soft water tank T sw2 When the liquid level is higher than 90%, the primary water treatment equipment E WT1 Also stopped running.

5. The unattended urea solution preparation method according to claim 1, characterized in that: In the logic (4), when the pure water tank T pw Liquid level is higher than 90% level, secondary water treatment equipment E WT2 Also stopped running.

6. The unattended urea solution preparation method according to claim 1, characterized in that: The logic (5) is used to prepare the reactor R us The heating temperature of the heating tube is between 35°C and 40°C.

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