CS256178B1 - Liquid fertilizer production equipment - Google Patents

Abstract

The solution concerns a device for utilizing heat from the proportioning mixture in the production of liquid fertilizers by means of heat-dissipating circuits connected in series to the flow of the hot proportioning mixture with one and/or two heat-dissipating circuits with the possibility of using a heat pump. The mixture cooled in this way is mixed with the circulated cooled proportioning mixture. The device, in conjunction with flow sensors and shut-off valves, secures the system in the event of a dosing failure before solidification.

Description

236178

The present invention provides a solution for the production of liquid fertilizers based on solutions or melts, which makes it possible to utilize the energy input of raw materials.

Liquid fertilizers are prepared by mixing proportionally. solutions or melt of urea, ammonium nitrate, water, ammonium sulphate and magnesium nitrate, ammonium phosphate, ammonium polyphosphate, or other fertilizing salts. The main input components are the intermediate products from the production of urea and ammonium nitrate, respectively, the ammonium phosphate or polyphosphate by the step of 100 to 200 ° C. The technological process of preparation, which consists in mixing the individual raw materials as well as the correction ducts to achieve the optimum composition and cooling the mixture with circulating water, is known and referred to as NITROGEN1971 No. 69, CHIMI ENGLISH THINKING 1969. 661, which returns a portion of the prepared " cooled " solution from the circulating vessel to the mixer in the flowable raw material, resulting in a reduction in the influence of the concentration of the incoming components, with the stabilizing effect of the composition and thus optimizing the conditions of continuous preparation. The disadvantage of this solution is that it reduces the temperature difference between the intercooled and cooling medium before cooling, increases the inefficient heat exchange surface cooler and does not use the entire volume of the circulation tank to stabilize the composition. In the case of high-capacity units, a significant amount of heat is required. Thus, for an hour production of 50 t of nitrogenous liquid fertilizer DAM with a composition of 42 wt. ammonium nitrate, 33 wt. Urea and 25 Percent Mass; water, it is necessary to drain about 7.9. 106 kj. h_1. Until now, the known processes do not utilize the apparent heat of entering the process and the heat is removed by circulating water or air from the mixture directly or by mixing the mixture with the circulating solution.

The aforementioned drawbacks can be solved by a substantial part of the heat being suitably utilized by the device for the production of liquid fertilizer by mixing the melts or fertilizer salt solutions, the substance of which is the raw material mixer connected to the heat exchanger of the first heat distribution circuit and / or the pipe by means of a mixer tube. with heat exchanger of the second-circuit circuit, the heat exchangers being pipes connected to the circulation circuit pipe of the circulation tank, the separate pump or the mixer. The circulating circuit pipe is connected to the raw material mixer by the over-regulating valve controlled by the feed flow sensor.

By means of the device according to the invention, the circulation of the already cooled solution is avoided while maintaining the principle of avoiding the risk of solidification of the mixer, achieving a low flow rate through the heat exchangers, achieving a higher input temperature Z0 'of the raw material mixer into the heat exchangers, making use of the predominant part of the degraded energy depositing input layers, which, in combination with a pressurized water circuit or a heat pump, make it possible to use it to heat up production and / or social spaces, to heat domestic water, or to pre-heat other technological media of agronomy technology, e.g., the heating of the nitric ammonium nitrate, the solution to the interconnection with the recirculation of the cooled solution through the mixer, as compared to AO 217 661, simultaneously reduces the realization costs by reducing the heat exchange area of the ratio mixture cooler; pumps with higher performance, in an otherwise higher ratio of recirculated solution from the circulation tank, and a higher-hundred bilizačným effect on the composition exiting-CWM solution from the system. It eliminates the possibility of pump cavitation and the need to regulate the system by sensing the specific gravity, as the proportional control of the feed rate is sufficient. The solution eliminates the possibility of being stuck in the mixing section when supplying some of the critical raw materials with a higher pour point or control line.

The accompanying figure shows an apparatus for the preparation of the invention, which illustrates the invention. Into the raw material mixer 1 is dosed a brown solution CA through a tube 12, a fertilizer solution CBa with a tube 13, a process-regulating-water tube 14. The hot mixture is drained through a tube 5 of a raw material mixer into a heat exchanger of the first heat-water circuit where it is cooled by circulating cooling medium, which as liquid enters the pipe 20 of the first heat conduit circuit and the outlet 21 of the first heat transfer circuit of the heat exchanger Q 1. Circulation of the cooling medium is provided by the circulating pump 16. In part, the cooled solution from the heat exchanger 2 of the first heat transfer circuit enters the heat exchanger 3 of the second heat water circuit through the heat exchanger tube 6, where it is cooled by the circulating water entering the inlet 23. circulating water flowing through the outlet pipe 24 through the circulation ducts. The cooled ratio mixture flows from the outlet pipe 7 of the mixer 4 to the mixer 4 and mixes with the cooled meter mixture circulating through the circulation tank 9, the circulation tank 10, the pipe 8 of the circulating tank and the mixer 4. The circulation pump provides the circulation pump 11. the outlet pipe 22 of the solution or dispatch. In case of a defect in the CA solution dosing system,

Claims (2)

256178 5 CB, the flow sensor 26 or the flow sensor 27 provides for opening the control valve 25 of the outlet pipe of the circulation circuit 15 and closing the valve 28 of the circulation circuit. In the case of the cooling of the relative mixture by evaporation of the heat-conducting liquid, it flows into the heat exchanger 2 through the tube 20 of the first conduit circuit. The vapors are discharged via the outlet pipe 21 of the first heat conduit to the heat pump 18 from which the condenser coolers 19 go. a heat exchanger connected to the heat consumer 29. The cooled ratio mixer of the heat exchanger of the first heat duct circuit is either cooled in a heat exchanger of the 3d heat transfer circuit or the heat exchanger bypass 30 directly into the mixer. Apparatus for producing liquid fertilizers by proportionally mixing the fertilizer salt melts and solutions, characterized in that the raw material mixer (1) is connected to the heat exchanger (2) of the first heat transfer circuit and / or the pipe by means of a raw material mixer tube (5). (6) heat exchangers with heat exchanger (3) of the second heat water circuit, the heat exchangers (2, 3) being connected to the tube (8) of the circulation circuit (10) of the circulation pump (10) by a tube (6, 7, 30) (11) separate or through a mixer (4). 1. Into the mixer 1 of the raw material is metered the tube 12 22 916 kgh "1 urea solution, concentration 72% by weight with temperature 100 ° C, tube 13 26 250 kgh" 1 solution of ammonium nitrate concentration 80% by weight 80 ° C And a condensate condensate 14 834 kgh-1 at a temperature of 90 [deg.] C. The blend of raw material mixer 1 at a temperature of 93 [deg.] C. passes through the pipe 5 of the mixer to the heat exchanger 2 of the first conduit circuit with circulation. The water is heated to 80 DEG C. with an inlet temperature of 40 DEG C. and passed through a pipe 21 to a heat exchanger 17 with an output of 5,413,106 m3. Circulation of the circuit is provided by the circulation pump 13. The mixture of the heat exchanger 2 of the first heat water circuit with the temperature of 50 ° C, the tube 6 of the exchangers, enters the heat exchanger 3 of the second circulating water-cooled circuit 15 ° Celsius, where it is cooled to 40 ° C , by conduction of 2,508.10s KJh 1. From the heat exchanger 3 of the second heat water circuit, the cooled ratio mixture, through the inlet 7 through the mixer 4, into the pipe 8 of the circulation circuit with a circulation of 150 th of a mixed solution of 40 ° C, is circulated by a pump 11 connected to a circulation container 10 of volume 80 m3, by tubes 8, 9. An increment of the 50,000 kgh -1 solution corresponding to the feedstock input is discharged through the delivery tube 22. 2. In the mixer, the proportion of the feedstock is the same as in Example 1, whereby at 5: 0 the flow rate of the ammonium nitrate solution below the set ratio monitored by the flow sensors FRCA 2S and FRCA 27 is controlled by proportional control of the closing of the control valve 25 of the bypass pipe 15 of the circulating circuit. A ratio of 50,000 kgh-1 to the cooling mixture flows through the raw material mixer. At the same time, it regulates a malfunction condition of the optimum ratio. OBJECT Apparatus according to claim 1, characterized in that the pipe (8) of the circulation circuit is connected by a pipe (15) to a raw material mixer (1), via a control valve (25), controlled by flow sensors (26, 27), input materials . 1 sheet of drawings